Commit | Line | Data |
---|---|---|
ad7f8a1f DA |
1 | /* |
2 | * Copyright © 2014 Red Hat | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
ad7f8a1f | 23 | #include <linux/delay.h> |
ad7f8a1f | 24 | #include <linux/errno.h> |
580fc13f JN |
25 | #include <linux/i2c.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/kernel.h> | |
ad7f8a1f | 28 | #include <linux/sched.h> |
75bc08ab | 29 | #include <linux/seq_file.h> |
873a95e0 | 30 | #include <linux/iopoll.h> |
ad7f8a1f | 31 | |
12a280c7 | 32 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
68acde76 | 33 | #include <linux/stacktrace.h> |
12a280c7 LP |
34 | #include <linux/sort.h> |
35 | #include <linux/timekeeping.h> | |
36 | #include <linux/math64.h> | |
37 | #endif | |
38 | ||
a4370c77 VS |
39 | #include <drm/drm_atomic.h> |
40 | #include <drm/drm_atomic_helper.h> | |
580fc13f JN |
41 | #include <drm/drm_dp_mst_helper.h> |
42 | #include <drm/drm_drv.h> | |
580fc13f | 43 | #include <drm/drm_print.h> |
fcd70cd3 | 44 | #include <drm/drm_probe_helper.h> |
ad7f8a1f | 45 | |
562836a2 | 46 | #include "drm_crtc_helper_internal.h" |
2f015ec6 | 47 | #include "drm_dp_mst_topology_internal.h" |
562836a2 | 48 | |
ad7f8a1f DA |
49 | /** |
50 | * DOC: dp mst helper | |
51 | * | |
52 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport | |
53 | * protocol. The helpers contain a topology manager and bandwidth manager. | |
54 | * The helpers encapsulate the sending and received of sideband msgs. | |
55 | */ | |
9408cc94 LP |
56 | struct drm_dp_pending_up_req { |
57 | struct drm_dp_sideband_msg_hdr hdr; | |
58 | struct drm_dp_sideband_msg_req_body msg; | |
59 | struct list_head next; | |
60 | }; | |
61 | ||
ad7f8a1f DA |
62 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
63 | char *buf); | |
ad7f8a1f | 64 | |
d0757afd | 65 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port); |
ad7f8a1f DA |
66 | |
67 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
68 | int id, | |
69 | struct drm_dp_payload *payload); | |
70 | ||
562836a2 VS |
71 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
72 | struct drm_dp_mst_port *port, | |
73 | int offset, int size, u8 *bytes); | |
ad7f8a1f DA |
74 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
75 | struct drm_dp_mst_port *port, | |
76 | int offset, int size, u8 *bytes); | |
77 | ||
6f85f738 LP |
78 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
79 | struct drm_dp_mst_branch *mstb); | |
f7948907 SP |
80 | |
81 | static void | |
82 | drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr, | |
83 | struct drm_dp_mst_branch *mstb); | |
84 | ||
ad7f8a1f DA |
85 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
86 | struct drm_dp_mst_branch *mstb, | |
87 | struct drm_dp_mst_port *port); | |
88 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
89 | u8 *guid); | |
90 | ||
91 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); | |
92 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); | |
93 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); | |
3dadbd29 | 94 | |
2f015ec6 LP |
95 | #define DBG_PREFIX "[dp_mst]" |
96 | ||
3dadbd29 VS |
97 | #define DP_STR(x) [DP_ ## x] = #x |
98 | ||
99 | static const char *drm_dp_mst_req_type_str(u8 req_type) | |
100 | { | |
101 | static const char * const req_type_str[] = { | |
102 | DP_STR(GET_MSG_TRANSACTION_VERSION), | |
103 | DP_STR(LINK_ADDRESS), | |
104 | DP_STR(CONNECTION_STATUS_NOTIFY), | |
105 | DP_STR(ENUM_PATH_RESOURCES), | |
106 | DP_STR(ALLOCATE_PAYLOAD), | |
107 | DP_STR(QUERY_PAYLOAD), | |
108 | DP_STR(RESOURCE_STATUS_NOTIFY), | |
109 | DP_STR(CLEAR_PAYLOAD_ID_TABLE), | |
110 | DP_STR(REMOTE_DPCD_READ), | |
111 | DP_STR(REMOTE_DPCD_WRITE), | |
112 | DP_STR(REMOTE_I2C_READ), | |
113 | DP_STR(REMOTE_I2C_WRITE), | |
114 | DP_STR(POWER_UP_PHY), | |
115 | DP_STR(POWER_DOWN_PHY), | |
116 | DP_STR(SINK_EVENT_NOTIFY), | |
117 | DP_STR(QUERY_STREAM_ENC_STATUS), | |
118 | }; | |
119 | ||
120 | if (req_type >= ARRAY_SIZE(req_type_str) || | |
121 | !req_type_str[req_type]) | |
122 | return "unknown"; | |
123 | ||
124 | return req_type_str[req_type]; | |
125 | } | |
126 | ||
127 | #undef DP_STR | |
128 | #define DP_STR(x) [DP_NAK_ ## x] = #x | |
129 | ||
130 | static const char *drm_dp_mst_nak_reason_str(u8 nak_reason) | |
131 | { | |
132 | static const char * const nak_reason_str[] = { | |
133 | DP_STR(WRITE_FAILURE), | |
134 | DP_STR(INVALID_READ), | |
135 | DP_STR(CRC_FAILURE), | |
136 | DP_STR(BAD_PARAM), | |
137 | DP_STR(DEFER), | |
138 | DP_STR(LINK_FAILURE), | |
139 | DP_STR(NO_RESOURCES), | |
140 | DP_STR(DPCD_FAIL), | |
141 | DP_STR(I2C_NAK), | |
142 | DP_STR(ALLOCATE_FAIL), | |
143 | }; | |
144 | ||
145 | if (nak_reason >= ARRAY_SIZE(nak_reason_str) || | |
146 | !nak_reason_str[nak_reason]) | |
147 | return "unknown"; | |
148 | ||
149 | return nak_reason_str[nak_reason]; | |
150 | } | |
151 | ||
152 | #undef DP_STR | |
2f015ec6 LP |
153 | #define DP_STR(x) [DRM_DP_SIDEBAND_TX_ ## x] = #x |
154 | ||
155 | static const char *drm_dp_mst_sideband_tx_state_str(int state) | |
156 | { | |
157 | static const char * const sideband_reason_str[] = { | |
158 | DP_STR(QUEUED), | |
159 | DP_STR(START_SEND), | |
160 | DP_STR(SENT), | |
161 | DP_STR(RX), | |
162 | DP_STR(TIMEOUT), | |
163 | }; | |
164 | ||
165 | if (state >= ARRAY_SIZE(sideband_reason_str) || | |
166 | !sideband_reason_str[state]) | |
167 | return "unknown"; | |
168 | ||
169 | return sideband_reason_str[state]; | |
170 | } | |
171 | ||
172 | static int | |
173 | drm_dp_mst_rad_to_str(const u8 rad[8], u8 lct, char *out, size_t len) | |
174 | { | |
175 | int i; | |
176 | u8 unpacked_rad[16]; | |
177 | ||
178 | for (i = 0; i < lct; i++) { | |
179 | if (i % 2) | |
180 | unpacked_rad[i] = rad[i / 2] >> 4; | |
181 | else | |
182 | unpacked_rad[i] = rad[i / 2] & BIT_MASK(4); | |
183 | } | |
184 | ||
185 | /* TODO: Eventually add something to printk so we can format the rad | |
186 | * like this: 1.2.3 | |
187 | */ | |
188 | return snprintf(out, len, "%*phC", lct, unpacked_rad); | |
189 | } | |
3dadbd29 | 190 | |
ad7f8a1f DA |
191 | /* sideband msg handling */ |
192 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) | |
193 | { | |
194 | u8 bitmask = 0x80; | |
195 | u8 bitshift = 7; | |
196 | u8 array_index = 0; | |
197 | int number_of_bits = num_nibbles * 4; | |
198 | u8 remainder = 0; | |
199 | ||
200 | while (number_of_bits != 0) { | |
201 | number_of_bits--; | |
202 | remainder <<= 1; | |
203 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
204 | bitmask >>= 1; | |
205 | bitshift--; | |
206 | if (bitmask == 0) { | |
207 | bitmask = 0x80; | |
208 | bitshift = 7; | |
209 | array_index++; | |
210 | } | |
211 | if ((remainder & 0x10) == 0x10) | |
212 | remainder ^= 0x13; | |
213 | } | |
214 | ||
215 | number_of_bits = 4; | |
216 | while (number_of_bits != 0) { | |
217 | number_of_bits--; | |
218 | remainder <<= 1; | |
219 | if ((remainder & 0x10) != 0) | |
220 | remainder ^= 0x13; | |
221 | } | |
222 | ||
223 | return remainder; | |
224 | } | |
225 | ||
226 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) | |
227 | { | |
228 | u8 bitmask = 0x80; | |
229 | u8 bitshift = 7; | |
230 | u8 array_index = 0; | |
231 | int number_of_bits = number_of_bytes * 8; | |
232 | u16 remainder = 0; | |
233 | ||
234 | while (number_of_bits != 0) { | |
235 | number_of_bits--; | |
236 | remainder <<= 1; | |
237 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
238 | bitmask >>= 1; | |
239 | bitshift--; | |
240 | if (bitmask == 0) { | |
241 | bitmask = 0x80; | |
242 | bitshift = 7; | |
243 | array_index++; | |
244 | } | |
245 | if ((remainder & 0x100) == 0x100) | |
246 | remainder ^= 0xd5; | |
247 | } | |
248 | ||
249 | number_of_bits = 8; | |
250 | while (number_of_bits != 0) { | |
251 | number_of_bits--; | |
252 | remainder <<= 1; | |
253 | if ((remainder & 0x100) != 0) | |
254 | remainder ^= 0xd5; | |
255 | } | |
256 | ||
257 | return remainder & 0xff; | |
258 | } | |
259 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) | |
260 | { | |
261 | u8 size = 3; | |
262 | size += (hdr->lct / 2); | |
263 | return size; | |
264 | } | |
265 | ||
266 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
267 | u8 *buf, int *len) | |
268 | { | |
269 | int idx = 0; | |
270 | int i; | |
271 | u8 crc4; | |
272 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); | |
273 | for (i = 0; i < (hdr->lct / 2); i++) | |
274 | buf[idx++] = hdr->rad[i]; | |
275 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | | |
276 | (hdr->msg_len & 0x3f); | |
277 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); | |
278 | ||
279 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); | |
280 | buf[idx - 1] |= (crc4 & 0xf); | |
281 | ||
282 | *len = idx; | |
283 | } | |
284 | ||
285 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
286 | u8 *buf, int buflen, u8 *hdrlen) | |
287 | { | |
288 | u8 crc4; | |
289 | u8 len; | |
290 | int i; | |
291 | u8 idx; | |
292 | if (buf[0] == 0) | |
293 | return false; | |
294 | len = 3; | |
295 | len += ((buf[0] & 0xf0) >> 4) / 2; | |
296 | if (len > buflen) | |
297 | return false; | |
298 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); | |
299 | ||
300 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { | |
301 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); | |
302 | return false; | |
303 | } | |
304 | ||
305 | hdr->lct = (buf[0] & 0xf0) >> 4; | |
306 | hdr->lcr = (buf[0] & 0xf); | |
307 | idx = 1; | |
308 | for (i = 0; i < (hdr->lct / 2); i++) | |
309 | hdr->rad[i] = buf[idx++]; | |
310 | hdr->broadcast = (buf[idx] >> 7) & 0x1; | |
311 | hdr->path_msg = (buf[idx] >> 6) & 0x1; | |
312 | hdr->msg_len = buf[idx] & 0x3f; | |
313 | idx++; | |
314 | hdr->somt = (buf[idx] >> 7) & 0x1; | |
315 | hdr->eomt = (buf[idx] >> 6) & 0x1; | |
316 | hdr->seqno = (buf[idx] >> 4) & 0x1; | |
317 | idx++; | |
318 | *hdrlen = idx; | |
319 | return true; | |
320 | } | |
321 | ||
2f015ec6 LP |
322 | void |
323 | drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req, | |
324 | struct drm_dp_sideband_msg_tx *raw) | |
ad7f8a1f DA |
325 | { |
326 | int idx = 0; | |
327 | int i; | |
328 | u8 *buf = raw->msg; | |
329 | buf[idx++] = req->req_type & 0x7f; | |
330 | ||
331 | switch (req->req_type) { | |
332 | case DP_ENUM_PATH_RESOURCES: | |
aa2a2fe1 LP |
333 | case DP_POWER_DOWN_PHY: |
334 | case DP_POWER_UP_PHY: | |
ad7f8a1f DA |
335 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
336 | idx++; | |
337 | break; | |
338 | case DP_ALLOCATE_PAYLOAD: | |
339 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | | |
340 | (req->u.allocate_payload.number_sdp_streams & 0xf); | |
341 | idx++; | |
342 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); | |
343 | idx++; | |
344 | buf[idx] = (req->u.allocate_payload.pbn >> 8); | |
345 | idx++; | |
346 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); | |
347 | idx++; | |
348 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { | |
349 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | | |
350 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); | |
351 | idx++; | |
352 | } | |
353 | if (req->u.allocate_payload.number_sdp_streams & 1) { | |
354 | i = req->u.allocate_payload.number_sdp_streams - 1; | |
355 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; | |
356 | idx++; | |
357 | } | |
358 | break; | |
359 | case DP_QUERY_PAYLOAD: | |
360 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; | |
361 | idx++; | |
362 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); | |
363 | idx++; | |
364 | break; | |
365 | case DP_REMOTE_DPCD_READ: | |
366 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; | |
367 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; | |
368 | idx++; | |
369 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; | |
370 | idx++; | |
371 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); | |
372 | idx++; | |
373 | buf[idx] = (req->u.dpcd_read.num_bytes); | |
374 | idx++; | |
375 | break; | |
376 | ||
377 | case DP_REMOTE_DPCD_WRITE: | |
378 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; | |
379 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; | |
380 | idx++; | |
381 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; | |
382 | idx++; | |
383 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); | |
384 | idx++; | |
385 | buf[idx] = (req->u.dpcd_write.num_bytes); | |
386 | idx++; | |
387 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); | |
388 | idx += req->u.dpcd_write.num_bytes; | |
389 | break; | |
390 | case DP_REMOTE_I2C_READ: | |
391 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; | |
392 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); | |
393 | idx++; | |
394 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { | |
395 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; | |
396 | idx++; | |
397 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; | |
398 | idx++; | |
399 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); | |
400 | idx += req->u.i2c_read.transactions[i].num_bytes; | |
401 | ||
c4e4fccc | 402 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4; |
ad7f8a1f DA |
403 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
404 | idx++; | |
405 | } | |
406 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; | |
407 | idx++; | |
408 | buf[idx] = (req->u.i2c_read.num_bytes_read); | |
409 | idx++; | |
410 | break; | |
411 | ||
412 | case DP_REMOTE_I2C_WRITE: | |
413 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; | |
414 | idx++; | |
415 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; | |
416 | idx++; | |
417 | buf[idx] = (req->u.i2c_write.num_bytes); | |
418 | idx++; | |
419 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); | |
420 | idx += req->u.i2c_write.num_bytes; | |
421 | break; | |
422 | } | |
423 | raw->cur_len = idx; | |
424 | } | |
2f015ec6 LP |
425 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_encode_sideband_req); |
426 | ||
427 | /* Decode a sideband request we've encoded, mainly used for debugging */ | |
428 | int | |
429 | drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw, | |
430 | struct drm_dp_sideband_msg_req_body *req) | |
431 | { | |
432 | const u8 *buf = raw->msg; | |
433 | int i, idx = 0; | |
434 | ||
435 | req->req_type = buf[idx++] & 0x7f; | |
436 | switch (req->req_type) { | |
437 | case DP_ENUM_PATH_RESOURCES: | |
438 | case DP_POWER_DOWN_PHY: | |
439 | case DP_POWER_UP_PHY: | |
440 | req->u.port_num.port_number = (buf[idx] >> 4) & 0xf; | |
441 | break; | |
442 | case DP_ALLOCATE_PAYLOAD: | |
443 | { | |
444 | struct drm_dp_allocate_payload *a = | |
445 | &req->u.allocate_payload; | |
446 | ||
447 | a->number_sdp_streams = buf[idx] & 0xf; | |
448 | a->port_number = (buf[idx] >> 4) & 0xf; | |
449 | ||
450 | WARN_ON(buf[++idx] & 0x80); | |
451 | a->vcpi = buf[idx] & 0x7f; | |
452 | ||
453 | a->pbn = buf[++idx] << 8; | |
454 | a->pbn |= buf[++idx]; | |
455 | ||
456 | idx++; | |
457 | for (i = 0; i < a->number_sdp_streams; i++) { | |
458 | a->sdp_stream_sink[i] = | |
459 | (buf[idx + (i / 2)] >> ((i % 2) ? 0 : 4)) & 0xf; | |
460 | } | |
461 | } | |
462 | break; | |
463 | case DP_QUERY_PAYLOAD: | |
464 | req->u.query_payload.port_number = (buf[idx] >> 4) & 0xf; | |
465 | WARN_ON(buf[++idx] & 0x80); | |
466 | req->u.query_payload.vcpi = buf[idx] & 0x7f; | |
467 | break; | |
468 | case DP_REMOTE_DPCD_READ: | |
469 | { | |
470 | struct drm_dp_remote_dpcd_read *r = &req->u.dpcd_read; | |
471 | ||
472 | r->port_number = (buf[idx] >> 4) & 0xf; | |
473 | ||
474 | r->dpcd_address = (buf[idx] << 16) & 0xf0000; | |
475 | r->dpcd_address |= (buf[++idx] << 8) & 0xff00; | |
476 | r->dpcd_address |= buf[++idx] & 0xff; | |
477 | ||
478 | r->num_bytes = buf[++idx]; | |
479 | } | |
480 | break; | |
481 | case DP_REMOTE_DPCD_WRITE: | |
482 | { | |
483 | struct drm_dp_remote_dpcd_write *w = | |
484 | &req->u.dpcd_write; | |
485 | ||
486 | w->port_number = (buf[idx] >> 4) & 0xf; | |
487 | ||
488 | w->dpcd_address = (buf[idx] << 16) & 0xf0000; | |
489 | w->dpcd_address |= (buf[++idx] << 8) & 0xff00; | |
490 | w->dpcd_address |= buf[++idx] & 0xff; | |
491 | ||
492 | w->num_bytes = buf[++idx]; | |
493 | ||
494 | w->bytes = kmemdup(&buf[++idx], w->num_bytes, | |
495 | GFP_KERNEL); | |
496 | if (!w->bytes) | |
497 | return -ENOMEM; | |
498 | } | |
499 | break; | |
500 | case DP_REMOTE_I2C_READ: | |
501 | { | |
502 | struct drm_dp_remote_i2c_read *r = &req->u.i2c_read; | |
503 | struct drm_dp_remote_i2c_read_tx *tx; | |
504 | bool failed = false; | |
505 | ||
506 | r->num_transactions = buf[idx] & 0x3; | |
507 | r->port_number = (buf[idx] >> 4) & 0xf; | |
508 | for (i = 0; i < r->num_transactions; i++) { | |
509 | tx = &r->transactions[i]; | |
510 | ||
511 | tx->i2c_dev_id = buf[++idx] & 0x7f; | |
512 | tx->num_bytes = buf[++idx]; | |
513 | tx->bytes = kmemdup(&buf[++idx], | |
514 | tx->num_bytes, | |
515 | GFP_KERNEL); | |
516 | if (!tx->bytes) { | |
517 | failed = true; | |
518 | break; | |
519 | } | |
520 | idx += tx->num_bytes; | |
521 | tx->no_stop_bit = (buf[idx] >> 5) & 0x1; | |
522 | tx->i2c_transaction_delay = buf[idx] & 0xf; | |
523 | } | |
524 | ||
525 | if (failed) { | |
2c8bc914 CIK |
526 | for (i = 0; i < r->num_transactions; i++) { |
527 | tx = &r->transactions[i]; | |
2f015ec6 | 528 | kfree(tx->bytes); |
2c8bc914 | 529 | } |
2f015ec6 LP |
530 | return -ENOMEM; |
531 | } | |
532 | ||
533 | r->read_i2c_device_id = buf[++idx] & 0x7f; | |
534 | r->num_bytes_read = buf[++idx]; | |
535 | } | |
536 | break; | |
537 | case DP_REMOTE_I2C_WRITE: | |
538 | { | |
539 | struct drm_dp_remote_i2c_write *w = &req->u.i2c_write; | |
540 | ||
541 | w->port_number = (buf[idx] >> 4) & 0xf; | |
542 | w->write_i2c_device_id = buf[++idx] & 0x7f; | |
543 | w->num_bytes = buf[++idx]; | |
544 | w->bytes = kmemdup(&buf[++idx], w->num_bytes, | |
545 | GFP_KERNEL); | |
546 | if (!w->bytes) | |
547 | return -ENOMEM; | |
548 | } | |
549 | break; | |
550 | } | |
551 | ||
552 | return 0; | |
553 | } | |
554 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_decode_sideband_req); | |
555 | ||
556 | void | |
557 | drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req, | |
558 | int indent, struct drm_printer *printer) | |
559 | { | |
560 | int i; | |
561 | ||
562 | #define P(f, ...) drm_printf_indent(printer, indent, f, ##__VA_ARGS__) | |
563 | if (req->req_type == DP_LINK_ADDRESS) { | |
564 | /* No contents to print */ | |
565 | P("type=%s\n", drm_dp_mst_req_type_str(req->req_type)); | |
566 | return; | |
567 | } | |
568 | ||
569 | P("type=%s contents:\n", drm_dp_mst_req_type_str(req->req_type)); | |
570 | indent++; | |
571 | ||
572 | switch (req->req_type) { | |
573 | case DP_ENUM_PATH_RESOURCES: | |
574 | case DP_POWER_DOWN_PHY: | |
575 | case DP_POWER_UP_PHY: | |
576 | P("port=%d\n", req->u.port_num.port_number); | |
577 | break; | |
578 | case DP_ALLOCATE_PAYLOAD: | |
579 | P("port=%d vcpi=%d pbn=%d sdp_streams=%d %*ph\n", | |
580 | req->u.allocate_payload.port_number, | |
581 | req->u.allocate_payload.vcpi, req->u.allocate_payload.pbn, | |
582 | req->u.allocate_payload.number_sdp_streams, | |
583 | req->u.allocate_payload.number_sdp_streams, | |
584 | req->u.allocate_payload.sdp_stream_sink); | |
585 | break; | |
586 | case DP_QUERY_PAYLOAD: | |
587 | P("port=%d vcpi=%d\n", | |
588 | req->u.query_payload.port_number, | |
589 | req->u.query_payload.vcpi); | |
590 | break; | |
591 | case DP_REMOTE_DPCD_READ: | |
592 | P("port=%d dpcd_addr=%05x len=%d\n", | |
593 | req->u.dpcd_read.port_number, req->u.dpcd_read.dpcd_address, | |
594 | req->u.dpcd_read.num_bytes); | |
595 | break; | |
596 | case DP_REMOTE_DPCD_WRITE: | |
597 | P("port=%d addr=%05x len=%d: %*ph\n", | |
598 | req->u.dpcd_write.port_number, | |
599 | req->u.dpcd_write.dpcd_address, | |
600 | req->u.dpcd_write.num_bytes, req->u.dpcd_write.num_bytes, | |
601 | req->u.dpcd_write.bytes); | |
602 | break; | |
603 | case DP_REMOTE_I2C_READ: | |
604 | P("port=%d num_tx=%d id=%d size=%d:\n", | |
605 | req->u.i2c_read.port_number, | |
606 | req->u.i2c_read.num_transactions, | |
607 | req->u.i2c_read.read_i2c_device_id, | |
608 | req->u.i2c_read.num_bytes_read); | |
609 | ||
610 | indent++; | |
611 | for (i = 0; i < req->u.i2c_read.num_transactions; i++) { | |
612 | const struct drm_dp_remote_i2c_read_tx *rtx = | |
613 | &req->u.i2c_read.transactions[i]; | |
614 | ||
615 | P("%d: id=%03d size=%03d no_stop_bit=%d tx_delay=%03d: %*ph\n", | |
616 | i, rtx->i2c_dev_id, rtx->num_bytes, | |
617 | rtx->no_stop_bit, rtx->i2c_transaction_delay, | |
618 | rtx->num_bytes, rtx->bytes); | |
619 | } | |
620 | break; | |
621 | case DP_REMOTE_I2C_WRITE: | |
622 | P("port=%d id=%d size=%d: %*ph\n", | |
623 | req->u.i2c_write.port_number, | |
624 | req->u.i2c_write.write_i2c_device_id, | |
625 | req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes, | |
626 | req->u.i2c_write.bytes); | |
627 | break; | |
628 | default: | |
629 | P("???\n"); | |
630 | break; | |
631 | } | |
632 | #undef P | |
633 | } | |
634 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_dump_sideband_msg_req_body); | |
635 | ||
636 | static inline void | |
637 | drm_dp_mst_dump_sideband_msg_tx(struct drm_printer *p, | |
638 | const struct drm_dp_sideband_msg_tx *txmsg) | |
639 | { | |
640 | struct drm_dp_sideband_msg_req_body req; | |
641 | char buf[64]; | |
642 | int ret; | |
643 | int i; | |
644 | ||
645 | drm_dp_mst_rad_to_str(txmsg->dst->rad, txmsg->dst->lct, buf, | |
646 | sizeof(buf)); | |
647 | drm_printf(p, "txmsg cur_offset=%x cur_len=%x seqno=%x state=%s path_msg=%d dst=%s\n", | |
648 | txmsg->cur_offset, txmsg->cur_len, txmsg->seqno, | |
649 | drm_dp_mst_sideband_tx_state_str(txmsg->state), | |
650 | txmsg->path_msg, buf); | |
651 | ||
652 | ret = drm_dp_decode_sideband_req(txmsg, &req); | |
653 | if (ret) { | |
654 | drm_printf(p, "<failed to decode sideband req: %d>\n", ret); | |
655 | return; | |
656 | } | |
657 | drm_dp_dump_sideband_msg_req_body(&req, 1, p); | |
658 | ||
659 | switch (req.req_type) { | |
660 | case DP_REMOTE_DPCD_WRITE: | |
661 | kfree(req.u.dpcd_write.bytes); | |
662 | break; | |
663 | case DP_REMOTE_I2C_READ: | |
664 | for (i = 0; i < req.u.i2c_read.num_transactions; i++) | |
665 | kfree(req.u.i2c_read.transactions[i].bytes); | |
666 | break; | |
667 | case DP_REMOTE_I2C_WRITE: | |
668 | kfree(req.u.i2c_write.bytes); | |
669 | break; | |
670 | } | |
671 | } | |
ad7f8a1f DA |
672 | |
673 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) | |
674 | { | |
675 | u8 crc4; | |
676 | crc4 = drm_dp_msg_data_crc4(msg, len); | |
677 | msg[len] = crc4; | |
678 | } | |
679 | ||
680 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, | |
681 | struct drm_dp_sideband_msg_tx *raw) | |
682 | { | |
683 | int idx = 0; | |
684 | u8 *buf = raw->msg; | |
685 | ||
686 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); | |
687 | ||
688 | raw->cur_len = idx; | |
689 | } | |
690 | ||
21a729d0 SP |
691 | static int drm_dp_sideband_msg_set_header(struct drm_dp_sideband_msg_rx *msg, |
692 | struct drm_dp_sideband_msg_hdr *hdr, | |
693 | u8 hdrlen) | |
ad7f8a1f | 694 | { |
21a729d0 SP |
695 | /* |
696 | * ignore out-of-order messages or messages that are part of a | |
697 | * failed transaction | |
698 | */ | |
699 | if (!hdr->somt && !msg->have_somt) | |
700 | return false; | |
ad7f8a1f | 701 | |
21a729d0 SP |
702 | /* get length contained in this portion */ |
703 | msg->curchunk_idx = 0; | |
704 | msg->curchunk_len = hdr->msg_len; | |
705 | msg->curchunk_hdrlen = hdrlen; | |
ad7f8a1f | 706 | |
21a729d0 SP |
707 | /* we have already gotten an somt - don't bother parsing */ |
708 | if (hdr->somt && msg->have_somt) | |
709 | return false; | |
636c4c3e | 710 | |
21a729d0 SP |
711 | if (hdr->somt) { |
712 | memcpy(&msg->initial_hdr, hdr, | |
713 | sizeof(struct drm_dp_sideband_msg_hdr)); | |
714 | msg->have_somt = true; | |
715 | } | |
716 | if (hdr->eomt) | |
717 | msg->have_eomt = true; | |
ad7f8a1f | 718 | |
21a729d0 SP |
719 | return true; |
720 | } | |
ad7f8a1f | 721 | |
21a729d0 SP |
722 | /* this adds a chunk of msg to the builder to get the final msg */ |
723 | static bool drm_dp_sideband_append_payload(struct drm_dp_sideband_msg_rx *msg, | |
724 | u8 *replybuf, u8 replybuflen) | |
725 | { | |
726 | u8 crc4; | |
ad7f8a1f | 727 | |
21a729d0 SP |
728 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); |
729 | msg->curchunk_idx += replybuflen; | |
ad7f8a1f DA |
730 | |
731 | if (msg->curchunk_idx >= msg->curchunk_len) { | |
732 | /* do CRC */ | |
733 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); | |
d6b8bbca BG |
734 | if (crc4 != msg->chunk[msg->curchunk_len - 1]) |
735 | print_hex_dump(KERN_DEBUG, "wrong crc", | |
736 | DUMP_PREFIX_NONE, 16, 1, | |
737 | msg->chunk, msg->curchunk_len, false); | |
ad7f8a1f DA |
738 | /* copy chunk into bigger msg */ |
739 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); | |
740 | msg->curlen += msg->curchunk_len - 1; | |
741 | } | |
742 | return true; | |
743 | } | |
744 | ||
745 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, | |
746 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
747 | { | |
748 | int idx = 1; | |
749 | int i; | |
750 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); | |
751 | idx += 16; | |
752 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; | |
753 | idx++; | |
754 | if (idx > raw->curlen) | |
755 | goto fail_len; | |
756 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { | |
757 | if (raw->msg[idx] & 0x80) | |
758 | repmsg->u.link_addr.ports[i].input_port = 1; | |
759 | ||
760 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; | |
761 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); | |
762 | ||
763 | idx++; | |
764 | if (idx > raw->curlen) | |
765 | goto fail_len; | |
766 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; | |
767 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; | |
768 | if (repmsg->u.link_addr.ports[i].input_port == 0) | |
769 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
770 | idx++; | |
771 | if (idx > raw->curlen) | |
772 | goto fail_len; | |
773 | if (repmsg->u.link_addr.ports[i].input_port == 0) { | |
774 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); | |
775 | idx++; | |
776 | if (idx > raw->curlen) | |
777 | goto fail_len; | |
778 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); | |
779 | idx += 16; | |
780 | if (idx > raw->curlen) | |
781 | goto fail_len; | |
782 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; | |
783 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); | |
784 | idx++; | |
785 | ||
786 | } | |
787 | if (idx > raw->curlen) | |
788 | goto fail_len; | |
789 | } | |
790 | ||
791 | return true; | |
792 | fail_len: | |
793 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
794 | return false; | |
795 | } | |
796 | ||
797 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, | |
798 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
799 | { | |
800 | int idx = 1; | |
801 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; | |
802 | idx++; | |
803 | if (idx > raw->curlen) | |
804 | goto fail_len; | |
805 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; | |
a4c30a48 | 806 | idx++; |
ad7f8a1f DA |
807 | if (idx > raw->curlen) |
808 | goto fail_len; | |
809 | ||
810 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); | |
811 | return true; | |
812 | fail_len: | |
813 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
814 | return false; | |
815 | } | |
816 | ||
817 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, | |
818 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
819 | { | |
820 | int idx = 1; | |
821 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; | |
822 | idx++; | |
823 | if (idx > raw->curlen) | |
824 | goto fail_len; | |
825 | return true; | |
826 | fail_len: | |
827 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); | |
828 | return false; | |
829 | } | |
830 | ||
831 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, | |
832 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
833 | { | |
834 | int idx = 1; | |
835 | ||
836 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); | |
837 | idx++; | |
838 | if (idx > raw->curlen) | |
839 | goto fail_len; | |
840 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; | |
841 | idx++; | |
842 | /* TODO check */ | |
843 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); | |
844 | return true; | |
845 | fail_len: | |
846 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); | |
847 | return false; | |
848 | } | |
849 | ||
850 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, | |
851 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
852 | { | |
853 | int idx = 1; | |
854 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; | |
a3c2b0ff | 855 | repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1; |
ad7f8a1f DA |
856 | idx++; |
857 | if (idx > raw->curlen) | |
858 | goto fail_len; | |
859 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
860 | idx += 2; | |
861 | if (idx > raw->curlen) | |
862 | goto fail_len; | |
863 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
864 | idx += 2; | |
865 | if (idx > raw->curlen) | |
866 | goto fail_len; | |
867 | return true; | |
868 | fail_len: | |
869 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); | |
870 | return false; | |
871 | } | |
872 | ||
873 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
874 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
875 | { | |
876 | int idx = 1; | |
877 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
878 | idx++; | |
879 | if (idx > raw->curlen) | |
880 | goto fail_len; | |
881 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; | |
882 | idx++; | |
883 | if (idx > raw->curlen) | |
884 | goto fail_len; | |
885 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
886 | idx += 2; | |
887 | if (idx > raw->curlen) | |
888 | goto fail_len; | |
889 | return true; | |
890 | fail_len: | |
891 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); | |
892 | return false; | |
893 | } | |
894 | ||
895 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
896 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
897 | { | |
898 | int idx = 1; | |
899 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
900 | idx++; | |
901 | if (idx > raw->curlen) | |
902 | goto fail_len; | |
903 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
904 | idx += 2; | |
905 | if (idx > raw->curlen) | |
906 | goto fail_len; | |
907 | return true; | |
908 | fail_len: | |
909 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); | |
910 | return false; | |
911 | } | |
912 | ||
0bb9c2b2 DP |
913 | static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, |
914 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
915 | { | |
916 | int idx = 1; | |
917 | ||
918 | repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; | |
919 | idx++; | |
920 | if (idx > raw->curlen) { | |
921 | DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n", | |
922 | idx, raw->curlen); | |
923 | return false; | |
924 | } | |
925 | return true; | |
926 | } | |
927 | ||
ad7f8a1f DA |
928 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
929 | struct drm_dp_sideband_msg_reply_body *msg) | |
930 | { | |
931 | memset(msg, 0, sizeof(*msg)); | |
932 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; | |
933 | msg->req_type = (raw->msg[0] & 0x7f); | |
934 | ||
45bbda1e | 935 | if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) { |
ad7f8a1f DA |
936 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); |
937 | msg->u.nak.reason = raw->msg[17]; | |
938 | msg->u.nak.nak_data = raw->msg[18]; | |
939 | return false; | |
940 | } | |
941 | ||
942 | switch (msg->req_type) { | |
943 | case DP_LINK_ADDRESS: | |
944 | return drm_dp_sideband_parse_link_address(raw, msg); | |
945 | case DP_QUERY_PAYLOAD: | |
946 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); | |
947 | case DP_REMOTE_DPCD_READ: | |
948 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); | |
949 | case DP_REMOTE_DPCD_WRITE: | |
950 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); | |
951 | case DP_REMOTE_I2C_READ: | |
952 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); | |
953 | case DP_ENUM_PATH_RESOURCES: | |
954 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); | |
955 | case DP_ALLOCATE_PAYLOAD: | |
956 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); | |
0bb9c2b2 DP |
957 | case DP_POWER_DOWN_PHY: |
958 | case DP_POWER_UP_PHY: | |
959 | return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); | |
f7948907 SP |
960 | case DP_CLEAR_PAYLOAD_ID_TABLE: |
961 | return true; /* since there's nothing to parse */ | |
ad7f8a1f | 962 | default: |
3dadbd29 VS |
963 | DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type, |
964 | drm_dp_mst_req_type_str(msg->req_type)); | |
ad7f8a1f DA |
965 | return false; |
966 | } | |
967 | } | |
968 | ||
969 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
970 | struct drm_dp_sideband_msg_req_body *msg) | |
971 | { | |
972 | int idx = 1; | |
973 | ||
974 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
975 | idx++; | |
976 | if (idx > raw->curlen) | |
977 | goto fail_len; | |
978 | ||
979 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); | |
980 | idx += 16; | |
981 | if (idx > raw->curlen) | |
982 | goto fail_len; | |
983 | ||
984 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; | |
985 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
986 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; | |
987 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; | |
988 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); | |
989 | idx++; | |
990 | return true; | |
991 | fail_len: | |
992 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); | |
993 | return false; | |
994 | } | |
995 | ||
996 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
997 | struct drm_dp_sideband_msg_req_body *msg) | |
998 | { | |
999 | int idx = 1; | |
1000 | ||
1001 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
1002 | idx++; | |
1003 | if (idx > raw->curlen) | |
1004 | goto fail_len; | |
1005 | ||
1006 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); | |
1007 | idx += 16; | |
1008 | if (idx > raw->curlen) | |
1009 | goto fail_len; | |
1010 | ||
1011 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
1012 | idx++; | |
1013 | return true; | |
1014 | fail_len: | |
1015 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); | |
1016 | return false; | |
1017 | } | |
1018 | ||
1019 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, | |
1020 | struct drm_dp_sideband_msg_req_body *msg) | |
1021 | { | |
1022 | memset(msg, 0, sizeof(*msg)); | |
1023 | msg->req_type = (raw->msg[0] & 0x7f); | |
1024 | ||
1025 | switch (msg->req_type) { | |
1026 | case DP_CONNECTION_STATUS_NOTIFY: | |
1027 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); | |
1028 | case DP_RESOURCE_STATUS_NOTIFY: | |
1029 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); | |
1030 | default: | |
3dadbd29 VS |
1031 | DRM_ERROR("Got unknown request 0x%02x (%s)\n", msg->req_type, |
1032 | drm_dp_mst_req_type_str(msg->req_type)); | |
ad7f8a1f DA |
1033 | return false; |
1034 | } | |
1035 | } | |
1036 | ||
cb897542 BG |
1037 | static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, |
1038 | u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) | |
ad7f8a1f DA |
1039 | { |
1040 | struct drm_dp_sideband_msg_req_body req; | |
1041 | ||
1042 | req.req_type = DP_REMOTE_DPCD_WRITE; | |
1043 | req.u.dpcd_write.port_number = port_num; | |
1044 | req.u.dpcd_write.dpcd_address = offset; | |
1045 | req.u.dpcd_write.num_bytes = num_bytes; | |
1046 | req.u.dpcd_write.bytes = bytes; | |
1047 | drm_dp_encode_sideband_req(&req, msg); | |
ad7f8a1f DA |
1048 | } |
1049 | ||
cb897542 | 1050 | static void build_link_address(struct drm_dp_sideband_msg_tx *msg) |
ad7f8a1f DA |
1051 | { |
1052 | struct drm_dp_sideband_msg_req_body req; | |
1053 | ||
1054 | req.req_type = DP_LINK_ADDRESS; | |
1055 | drm_dp_encode_sideband_req(&req, msg); | |
ad7f8a1f DA |
1056 | } |
1057 | ||
bdf7e3b7 | 1058 | static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg) |
f7948907 SP |
1059 | { |
1060 | struct drm_dp_sideband_msg_req_body req; | |
1061 | ||
1062 | req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; | |
1063 | drm_dp_encode_sideband_req(&req, msg); | |
f7948907 SP |
1064 | } |
1065 | ||
cb897542 BG |
1066 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, |
1067 | int port_num) | |
ad7f8a1f DA |
1068 | { |
1069 | struct drm_dp_sideband_msg_req_body req; | |
1070 | ||
1071 | req.req_type = DP_ENUM_PATH_RESOURCES; | |
1072 | req.u.port_num.port_number = port_num; | |
1073 | drm_dp_encode_sideband_req(&req, msg); | |
1074 | msg->path_msg = true; | |
1075 | return 0; | |
1076 | } | |
1077 | ||
cb897542 BG |
1078 | static void build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, |
1079 | int port_num, | |
1080 | u8 vcpi, uint16_t pbn, | |
1081 | u8 number_sdp_streams, | |
1082 | u8 *sdp_stream_sink) | |
ad7f8a1f DA |
1083 | { |
1084 | struct drm_dp_sideband_msg_req_body req; | |
1085 | memset(&req, 0, sizeof(req)); | |
1086 | req.req_type = DP_ALLOCATE_PAYLOAD; | |
1087 | req.u.allocate_payload.port_number = port_num; | |
1088 | req.u.allocate_payload.vcpi = vcpi; | |
1089 | req.u.allocate_payload.pbn = pbn; | |
ef8f9bea LY |
1090 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
1091 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, | |
1092 | number_sdp_streams); | |
ad7f8a1f DA |
1093 | drm_dp_encode_sideband_req(&req, msg); |
1094 | msg->path_msg = true; | |
ad7f8a1f DA |
1095 | } |
1096 | ||
cb897542 BG |
1097 | static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, |
1098 | int port_num, bool power_up) | |
0bb9c2b2 DP |
1099 | { |
1100 | struct drm_dp_sideband_msg_req_body req; | |
1101 | ||
1102 | if (power_up) | |
1103 | req.req_type = DP_POWER_UP_PHY; | |
1104 | else | |
1105 | req.req_type = DP_POWER_DOWN_PHY; | |
1106 | ||
1107 | req.u.port_num.port_number = port_num; | |
1108 | drm_dp_encode_sideband_req(&req, msg); | |
1109 | msg->path_msg = true; | |
0bb9c2b2 DP |
1110 | } |
1111 | ||
ad7f8a1f DA |
1112 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
1113 | struct drm_dp_vcpi *vcpi) | |
1114 | { | |
dfda0df3 | 1115 | int ret, vcpi_ret; |
ad7f8a1f DA |
1116 | |
1117 | mutex_lock(&mgr->payload_lock); | |
1118 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); | |
1119 | if (ret > mgr->max_payloads) { | |
1120 | ret = -EINVAL; | |
1121 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); | |
1122 | goto out_unlock; | |
1123 | } | |
1124 | ||
dfda0df3 DA |
1125 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
1126 | if (vcpi_ret > mgr->max_payloads) { | |
1127 | ret = -EINVAL; | |
1128 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); | |
1129 | goto out_unlock; | |
1130 | } | |
1131 | ||
ad7f8a1f | 1132 | set_bit(ret, &mgr->payload_mask); |
dfda0df3 DA |
1133 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
1134 | vcpi->vcpi = vcpi_ret + 1; | |
ad7f8a1f DA |
1135 | mgr->proposed_vcpis[ret - 1] = vcpi; |
1136 | out_unlock: | |
1137 | mutex_unlock(&mgr->payload_lock); | |
1138 | return ret; | |
1139 | } | |
1140 | ||
1141 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
dfda0df3 | 1142 | int vcpi) |
ad7f8a1f | 1143 | { |
dfda0df3 DA |
1144 | int i; |
1145 | if (vcpi == 0) | |
ad7f8a1f DA |
1146 | return; |
1147 | ||
1148 | mutex_lock(&mgr->payload_lock); | |
dfda0df3 DA |
1149 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
1150 | clear_bit(vcpi - 1, &mgr->vcpi_mask); | |
1151 | ||
1152 | for (i = 0; i < mgr->max_payloads; i++) { | |
db0cc143 VS |
1153 | if (mgr->proposed_vcpis[i] && |
1154 | mgr->proposed_vcpis[i]->vcpi == vcpi) { | |
1155 | mgr->proposed_vcpis[i] = NULL; | |
1156 | clear_bit(i + 1, &mgr->payload_mask); | |
1157 | } | |
dfda0df3 | 1158 | } |
ad7f8a1f DA |
1159 | mutex_unlock(&mgr->payload_lock); |
1160 | } | |
1161 | ||
1162 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, | |
1163 | struct drm_dp_sideband_msg_tx *txmsg) | |
1164 | { | |
992d38cc | 1165 | unsigned int state; |
cd961bb9 DV |
1166 | |
1167 | /* | |
1168 | * All updates to txmsg->state are protected by mgr->qlock, and the two | |
1169 | * cases we check here are terminal states. For those the barriers | |
1170 | * provided by the wake_up/wait_event pair are enough. | |
1171 | */ | |
992d38cc CW |
1172 | state = READ_ONCE(txmsg->state); |
1173 | return (state == DRM_DP_SIDEBAND_TX_RX || | |
1174 | state == DRM_DP_SIDEBAND_TX_TIMEOUT); | |
ad7f8a1f DA |
1175 | } |
1176 | ||
1177 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, | |
1178 | struct drm_dp_sideband_msg_tx *txmsg) | |
1179 | { | |
1180 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
1181 | int ret; | |
1182 | ||
1183 | ret = wait_event_timeout(mgr->tx_waitq, | |
1184 | check_txmsg_state(mgr, txmsg), | |
1185 | (4 * HZ)); | |
1186 | mutex_lock(&mstb->mgr->qlock); | |
1187 | if (ret > 0) { | |
1188 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { | |
1189 | ret = -EIO; | |
1190 | goto out; | |
1191 | } | |
1192 | } else { | |
1193 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); | |
1194 | ||
1195 | /* dump some state */ | |
1196 | ret = -EIO; | |
1197 | ||
1198 | /* remove from q */ | |
1199 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || | |
d308a881 | 1200 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) |
ad7f8a1f | 1201 | list_del(&txmsg->next); |
ad7f8a1f DA |
1202 | } |
1203 | out: | |
f0a8f533 | 1204 | if (unlikely(ret == -EIO) && drm_debug_enabled(DRM_UT_DP)) { |
2f015ec6 LP |
1205 | struct drm_printer p = drm_debug_printer(DBG_PREFIX); |
1206 | ||
1207 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); | |
1208 | } | |
ad7f8a1f DA |
1209 | mutex_unlock(&mgr->qlock); |
1210 | ||
5a64967a | 1211 | drm_dp_mst_kick_tx(mgr); |
ad7f8a1f DA |
1212 | return ret; |
1213 | } | |
1214 | ||
1215 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) | |
1216 | { | |
1217 | struct drm_dp_mst_branch *mstb; | |
1218 | ||
1219 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); | |
1220 | if (!mstb) | |
1221 | return NULL; | |
1222 | ||
1223 | mstb->lct = lct; | |
1224 | if (lct > 1) | |
1225 | memcpy(mstb->rad, rad, lct / 2); | |
1226 | INIT_LIST_HEAD(&mstb->ports); | |
ebcc0e6b LP |
1227 | kref_init(&mstb->topology_kref); |
1228 | kref_init(&mstb->malloc_kref); | |
ad7f8a1f DA |
1229 | return mstb; |
1230 | } | |
1231 | ||
91a25e46 ML |
1232 | static void drm_dp_free_mst_branch_device(struct kref *kref) |
1233 | { | |
ebcc0e6b LP |
1234 | struct drm_dp_mst_branch *mstb = |
1235 | container_of(kref, struct drm_dp_mst_branch, malloc_kref); | |
1236 | ||
1237 | if (mstb->port_parent) | |
1238 | drm_dp_mst_put_port_malloc(mstb->port_parent); | |
1239 | ||
91a25e46 ML |
1240 | kfree(mstb); |
1241 | } | |
1242 | ||
ebcc0e6b LP |
1243 | /** |
1244 | * DOC: Branch device and port refcounting | |
1245 | * | |
1246 | * Topology refcount overview | |
1247 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
1248 | * | |
1249 | * The refcounting schemes for &struct drm_dp_mst_branch and &struct | |
1250 | * drm_dp_mst_port are somewhat unusual. Both ports and branch devices have | |
1251 | * two different kinds of refcounts: topology refcounts, and malloc refcounts. | |
1252 | * | |
1253 | * Topology refcounts are not exposed to drivers, and are handled internally | |
1254 | * by the DP MST helpers. The helpers use them in order to prevent the | |
1255 | * in-memory topology state from being changed in the middle of critical | |
1256 | * operations like changing the internal state of payload allocations. This | |
1257 | * means each branch and port will be considered to be connected to the rest | |
1e55a53a | 1258 | * of the topology until its topology refcount reaches zero. Additionally, |
ebcc0e6b LP |
1259 | * for ports this means that their associated &struct drm_connector will stay |
1260 | * registered with userspace until the port's refcount reaches 0. | |
1261 | * | |
1262 | * Malloc refcount overview | |
1263 | * ~~~~~~~~~~~~~~~~~~~~~~~~ | |
1264 | * | |
1265 | * Malloc references are used to keep a &struct drm_dp_mst_port or &struct | |
1266 | * drm_dp_mst_branch allocated even after all of its topology references have | |
1267 | * been dropped, so that the driver or MST helpers can safely access each | |
1268 | * branch's last known state before it was disconnected from the topology. | |
1269 | * When the malloc refcount of a port or branch reaches 0, the memory | |
1270 | * allocation containing the &struct drm_dp_mst_branch or &struct | |
1271 | * drm_dp_mst_port respectively will be freed. | |
1272 | * | |
1273 | * For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed | |
1274 | * to drivers. As of writing this documentation, there are no drivers that | |
1275 | * have a usecase for accessing &struct drm_dp_mst_branch outside of the MST | |
1276 | * helpers. Exposing this API to drivers in a race-free manner would take more | |
1277 | * tweaking of the refcounting scheme, however patches are welcome provided | |
1278 | * there is a legitimate driver usecase for this. | |
1279 | * | |
1280 | * Refcount relationships in a topology | |
1281 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
1282 | * | |
1283 | * Let's take a look at why the relationship between topology and malloc | |
1284 | * refcounts is designed the way it is. | |
1285 | * | |
1286 | * .. kernel-figure:: dp-mst/topology-figure-1.dot | |
1287 | * | |
1288 | * An example of topology and malloc refs in a DP MST topology with two | |
1289 | * active payloads. Topology refcount increments are indicated by solid | |
1290 | * lines, and malloc refcount increments are indicated by dashed lines. | |
1291 | * Each starts from the branch which incremented the refcount, and ends at | |
1292 | * the branch to which the refcount belongs to, i.e. the arrow points the | |
1293 | * same way as the C pointers used to reference a structure. | |
1294 | * | |
1295 | * As you can see in the above figure, every branch increments the topology | |
1e55a53a MR |
1296 | * refcount of its children, and increments the malloc refcount of its |
1297 | * parent. Additionally, every payload increments the malloc refcount of its | |
ebcc0e6b LP |
1298 | * assigned port by 1. |
1299 | * | |
1300 | * So, what would happen if MSTB #3 from the above figure was unplugged from | |
1301 | * the system, but the driver hadn't yet removed payload #2 from port #3? The | |
1302 | * topology would start to look like the figure below. | |
1303 | * | |
1304 | * .. kernel-figure:: dp-mst/topology-figure-2.dot | |
1305 | * | |
1306 | * Ports and branch devices which have been released from memory are | |
1307 | * colored grey, and references which have been removed are colored red. | |
1308 | * | |
1309 | * Whenever a port or branch device's topology refcount reaches zero, it will | |
1310 | * decrement the topology refcounts of all its children, the malloc refcount | |
1311 | * of its parent, and finally its own malloc refcount. For MSTB #4 and port | |
1312 | * #4, this means they both have been disconnected from the topology and freed | |
1313 | * from memory. But, because payload #2 is still holding a reference to port | |
1e55a53a | 1314 | * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port |
ebcc0e6b | 1315 | * is still accessible from memory. This also means port #3 has not yet |
1e55a53a | 1316 | * decremented the malloc refcount of MSTB #3, so its &struct |
ebcc0e6b LP |
1317 | * drm_dp_mst_branch will also stay allocated in memory until port #3's |
1318 | * malloc refcount reaches 0. | |
1319 | * | |
1320 | * This relationship is necessary because in order to release payload #2, we | |
1321 | * need to be able to figure out the last relative of port #3 that's still | |
1322 | * connected to the topology. In this case, we would travel up the topology as | |
1323 | * shown below. | |
1324 | * | |
1325 | * .. kernel-figure:: dp-mst/topology-figure-3.dot | |
1326 | * | |
1327 | * And finally, remove payload #2 by communicating with port #2 through | |
1328 | * sideband transactions. | |
1329 | */ | |
1330 | ||
1331 | /** | |
1332 | * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch | |
1333 | * device | |
1334 | * @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of | |
1335 | * | |
1336 | * Increments &drm_dp_mst_branch.malloc_kref. When | |
1337 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb | |
1338 | * will be released and @mstb may no longer be used. | |
1339 | * | |
1340 | * See also: drm_dp_mst_put_mstb_malloc() | |
1341 | */ | |
1342 | static void | |
1343 | drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb) | |
1344 | { | |
1345 | kref_get(&mstb->malloc_kref); | |
1346 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref)); | |
1347 | } | |
1348 | ||
1349 | /** | |
1350 | * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch | |
1351 | * device | |
1352 | * @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of | |
1353 | * | |
1354 | * Decrements &drm_dp_mst_branch.malloc_kref. When | |
1355 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb | |
1356 | * will be released and @mstb may no longer be used. | |
1357 | * | |
1358 | * See also: drm_dp_mst_get_mstb_malloc() | |
1359 | */ | |
1360 | static void | |
1361 | drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb) | |
1362 | { | |
1363 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1); | |
1364 | kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device); | |
1365 | } | |
1366 | ||
1367 | static void drm_dp_free_mst_port(struct kref *kref) | |
1368 | { | |
1369 | struct drm_dp_mst_port *port = | |
1370 | container_of(kref, struct drm_dp_mst_port, malloc_kref); | |
1371 | ||
1372 | drm_dp_mst_put_mstb_malloc(port->parent); | |
1373 | kfree(port); | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port | |
1378 | * @port: The &struct drm_dp_mst_port to increment the malloc refcount of | |
1379 | * | |
1380 | * Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref | |
1381 | * reaches 0, the memory allocation for @port will be released and @port may | |
1382 | * no longer be used. | |
1383 | * | |
1384 | * Because @port could potentially be freed at any time by the DP MST helpers | |
1385 | * if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this | |
1386 | * function, drivers that which to make use of &struct drm_dp_mst_port should | |
1387 | * ensure that they grab at least one main malloc reference to their MST ports | |
1388 | * in &drm_dp_mst_topology_cbs.add_connector. This callback is called before | |
1389 | * there is any chance for &drm_dp_mst_port.malloc_kref to reach 0. | |
1390 | * | |
1391 | * See also: drm_dp_mst_put_port_malloc() | |
1392 | */ | |
1393 | void | |
1394 | drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port) | |
1395 | { | |
1396 | kref_get(&port->malloc_kref); | |
1397 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref)); | |
1398 | } | |
1399 | EXPORT_SYMBOL(drm_dp_mst_get_port_malloc); | |
1400 | ||
1401 | /** | |
1402 | * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port | |
1403 | * @port: The &struct drm_dp_mst_port to decrement the malloc refcount of | |
1404 | * | |
1405 | * Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref | |
1406 | * reaches 0, the memory allocation for @port will be released and @port may | |
1407 | * no longer be used. | |
1408 | * | |
1409 | * See also: drm_dp_mst_get_port_malloc() | |
1410 | */ | |
1411 | void | |
1412 | drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port) | |
1413 | { | |
1414 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1); | |
1415 | kref_put(&port->malloc_kref, drm_dp_free_mst_port); | |
1416 | } | |
1417 | EXPORT_SYMBOL(drm_dp_mst_put_port_malloc); | |
1418 | ||
12a280c7 LP |
1419 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
1420 | ||
1421 | #define STACK_DEPTH 8 | |
1422 | ||
1423 | static noinline void | |
1424 | __topology_ref_save(struct drm_dp_mst_topology_mgr *mgr, | |
1425 | struct drm_dp_mst_topology_ref_history *history, | |
1426 | enum drm_dp_mst_topology_ref_type type) | |
ad7f8a1f | 1427 | { |
12a280c7 LP |
1428 | struct drm_dp_mst_topology_ref_entry *entry = NULL; |
1429 | depot_stack_handle_t backtrace; | |
1430 | ulong stack_entries[STACK_DEPTH]; | |
1431 | uint n; | |
1432 | int i; | |
ad7f8a1f | 1433 | |
12a280c7 LP |
1434 | n = stack_trace_save(stack_entries, ARRAY_SIZE(stack_entries), 1); |
1435 | backtrace = stack_depot_save(stack_entries, n, GFP_KERNEL); | |
1436 | if (!backtrace) | |
1437 | return; | |
1438 | ||
1439 | /* Try to find an existing entry for this backtrace */ | |
1440 | for (i = 0; i < history->len; i++) { | |
1441 | if (history->entries[i].backtrace == backtrace) { | |
1442 | entry = &history->entries[i]; | |
1443 | break; | |
1444 | } | |
ad7f8a1f DA |
1445 | } |
1446 | ||
12a280c7 LP |
1447 | /* Otherwise add one */ |
1448 | if (!entry) { | |
1449 | struct drm_dp_mst_topology_ref_entry *new; | |
1450 | int new_len = history->len + 1; | |
1451 | ||
1452 | new = krealloc(history->entries, sizeof(*new) * new_len, | |
1453 | GFP_KERNEL); | |
1454 | if (!new) | |
1455 | return; | |
1456 | ||
1457 | entry = &new[history->len]; | |
1458 | history->len = new_len; | |
1459 | history->entries = new; | |
1460 | ||
1461 | entry->backtrace = backtrace; | |
1462 | entry->type = type; | |
1463 | entry->count = 0; | |
ad7f8a1f | 1464 | } |
12a280c7 LP |
1465 | entry->count++; |
1466 | entry->ts_nsec = ktime_get_ns(); | |
1467 | } | |
1468 | ||
1469 | static int | |
1470 | topology_ref_history_cmp(const void *a, const void *b) | |
1471 | { | |
1472 | const struct drm_dp_mst_topology_ref_entry *entry_a = a, *entry_b = b; | |
1473 | ||
1474 | if (entry_a->ts_nsec > entry_b->ts_nsec) | |
1475 | return 1; | |
1476 | else if (entry_a->ts_nsec < entry_b->ts_nsec) | |
1477 | return -1; | |
1478 | else | |
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | static inline const char * | |
1483 | topology_ref_type_to_str(enum drm_dp_mst_topology_ref_type type) | |
1484 | { | |
1485 | if (type == DRM_DP_MST_TOPOLOGY_REF_GET) | |
1486 | return "get"; | |
1487 | else | |
1488 | return "put"; | |
1489 | } | |
1490 | ||
1491 | static void | |
1492 | __dump_topology_ref_history(struct drm_dp_mst_topology_ref_history *history, | |
1493 | void *ptr, const char *type_str) | |
1494 | { | |
1495 | struct drm_printer p = drm_debug_printer(DBG_PREFIX); | |
1496 | char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
1497 | int i; | |
1498 | ||
1499 | if (!buf) | |
1500 | return; | |
1501 | ||
1502 | if (!history->len) | |
1503 | goto out; | |
1504 | ||
1505 | /* First, sort the list so that it goes from oldest to newest | |
1506 | * reference entry | |
1507 | */ | |
1508 | sort(history->entries, history->len, sizeof(*history->entries), | |
1509 | topology_ref_history_cmp, NULL); | |
1510 | ||
1511 | drm_printf(&p, "%s (%p) topology count reached 0, dumping history:\n", | |
1512 | type_str, ptr); | |
1513 | ||
1514 | for (i = 0; i < history->len; i++) { | |
1515 | const struct drm_dp_mst_topology_ref_entry *entry = | |
1516 | &history->entries[i]; | |
1517 | ulong *entries; | |
1518 | uint nr_entries; | |
1519 | u64 ts_nsec = entry->ts_nsec; | |
b149cbfe | 1520 | u32 rem_nsec = do_div(ts_nsec, 1000000000); |
12a280c7 LP |
1521 | |
1522 | nr_entries = stack_depot_fetch(entry->backtrace, &entries); | |
1523 | stack_trace_snprint(buf, PAGE_SIZE, entries, nr_entries, 4); | |
1524 | ||
b149cbfe | 1525 | drm_printf(&p, " %d %ss (last at %5llu.%06u):\n%s", |
12a280c7 LP |
1526 | entry->count, |
1527 | topology_ref_type_to_str(entry->type), | |
1528 | ts_nsec, rem_nsec / 1000, buf); | |
ad7f8a1f | 1529 | } |
ad7f8a1f | 1530 | |
12a280c7 LP |
1531 | /* Now free the history, since this is the only time we expose it */ |
1532 | kfree(history->entries); | |
1533 | out: | |
1534 | kfree(buf); | |
1535 | } | |
91a25e46 | 1536 | |
12a280c7 LP |
1537 | static __always_inline void |
1538 | drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) | |
1539 | { | |
1540 | __dump_topology_ref_history(&mstb->topology_ref_history, mstb, | |
1541 | "MSTB"); | |
1542 | } | |
1543 | ||
1544 | static __always_inline void | |
1545 | drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) | |
1546 | { | |
1547 | __dump_topology_ref_history(&port->topology_ref_history, port, | |
1548 | "Port"); | |
1549 | } | |
1550 | ||
1551 | static __always_inline void | |
1552 | save_mstb_topology_ref(struct drm_dp_mst_branch *mstb, | |
1553 | enum drm_dp_mst_topology_ref_type type) | |
1554 | { | |
1555 | __topology_ref_save(mstb->mgr, &mstb->topology_ref_history, type); | |
1556 | } | |
1557 | ||
1558 | static __always_inline void | |
1559 | save_port_topology_ref(struct drm_dp_mst_port *port, | |
1560 | enum drm_dp_mst_topology_ref_type type) | |
1561 | { | |
1562 | __topology_ref_save(port->mgr, &port->topology_ref_history, type); | |
1563 | } | |
1564 | ||
1565 | static inline void | |
1566 | topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) | |
1567 | { | |
1568 | mutex_lock(&mgr->topology_ref_history_lock); | |
1569 | } | |
1570 | ||
1571 | static inline void | |
1572 | topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) | |
1573 | { | |
1574 | mutex_unlock(&mgr->topology_ref_history_lock); | |
1575 | } | |
1576 | #else | |
1577 | static inline void | |
1578 | topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) {} | |
1579 | static inline void | |
1580 | topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) {} | |
1581 | static inline void | |
1582 | drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) {} | |
1583 | static inline void | |
1584 | drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) {} | |
1585 | #define save_mstb_topology_ref(mstb, type) | |
1586 | #define save_port_topology_ref(port, type) | |
1587 | #endif | |
1588 | ||
ad7f8a1f DA |
1589 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
1590 | { | |
ebcc0e6b LP |
1591 | struct drm_dp_mst_branch *mstb = |
1592 | container_of(kref, struct drm_dp_mst_branch, topology_kref); | |
1593 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
ad7f8a1f | 1594 | |
12a280c7 LP |
1595 | drm_dp_mst_dump_mstb_topology_history(mstb); |
1596 | ||
7cb12d48 | 1597 | INIT_LIST_HEAD(&mstb->destroy_next); |
ad7f8a1f | 1598 | |
7cb12d48 LP |
1599 | /* |
1600 | * This can get called under mgr->mutex, so we need to perform the | |
1601 | * actual destruction of the mstb in another worker | |
1602 | */ | |
1603 | mutex_lock(&mgr->delayed_destroy_lock); | |
1604 | list_add(&mstb->destroy_next, &mgr->destroy_branch_device_list); | |
1605 | mutex_unlock(&mgr->delayed_destroy_lock); | |
1606 | schedule_work(&mgr->delayed_destroy_work); | |
ad7f8a1f DA |
1607 | } |
1608 | ||
ebcc0e6b LP |
1609 | /** |
1610 | * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a | |
1e55a53a | 1611 | * branch device unless it's zero |
ebcc0e6b LP |
1612 | * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of |
1613 | * | |
1614 | * Attempts to grab a topology reference to @mstb, if it hasn't yet been | |
1615 | * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has | |
1616 | * reached 0). Holding a topology reference implies that a malloc reference | |
1617 | * will be held to @mstb as long as the user holds the topology reference. | |
1618 | * | |
1619 | * Care should be taken to ensure that the user has at least one malloc | |
1620 | * reference to @mstb. If you already have a topology reference to @mstb, you | |
1621 | * should use drm_dp_mst_topology_get_mstb() instead. | |
1622 | * | |
1623 | * See also: | |
1624 | * drm_dp_mst_topology_get_mstb() | |
1625 | * drm_dp_mst_topology_put_mstb() | |
1626 | * | |
1627 | * Returns: | |
1628 | * * 1: A topology reference was grabbed successfully | |
1629 | * * 0: @port is no longer in the topology, no reference was grabbed | |
1630 | */ | |
1631 | static int __must_check | |
1632 | drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb) | |
ad7f8a1f | 1633 | { |
12a280c7 | 1634 | int ret; |
ebcc0e6b | 1635 | |
12a280c7 LP |
1636 | topology_ref_history_lock(mstb->mgr); |
1637 | ret = kref_get_unless_zero(&mstb->topology_kref); | |
1638 | if (ret) { | |
1639 | DRM_DEBUG("mstb %p (%d)\n", | |
1640 | mstb, kref_read(&mstb->topology_kref)); | |
1641 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET); | |
1642 | } | |
1643 | ||
1644 | topology_ref_history_unlock(mstb->mgr); | |
ebcc0e6b LP |
1645 | |
1646 | return ret; | |
ad7f8a1f DA |
1647 | } |
1648 | ||
ebcc0e6b LP |
1649 | /** |
1650 | * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a | |
1651 | * branch device | |
1652 | * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of | |
1653 | * | |
1654 | * Increments &drm_dp_mst_branch.topology_refcount without checking whether or | |
1655 | * not it's already reached 0. This is only valid to use in scenarios where | |
1656 | * you are already guaranteed to have at least one active topology reference | |
1657 | * to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used. | |
1658 | * | |
1659 | * See also: | |
1660 | * drm_dp_mst_topology_try_get_mstb() | |
1661 | * drm_dp_mst_topology_put_mstb() | |
1662 | */ | |
1663 | static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb) | |
1664 | { | |
12a280c7 LP |
1665 | topology_ref_history_lock(mstb->mgr); |
1666 | ||
1667 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET); | |
ebcc0e6b LP |
1668 | WARN_ON(kref_read(&mstb->topology_kref) == 0); |
1669 | kref_get(&mstb->topology_kref); | |
1670 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref)); | |
12a280c7 LP |
1671 | |
1672 | topology_ref_history_unlock(mstb->mgr); | |
ebcc0e6b LP |
1673 | } |
1674 | ||
1675 | /** | |
1676 | * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch | |
1677 | * device | |
1678 | * @mstb: The &struct drm_dp_mst_branch to release the topology reference from | |
1679 | * | |
1680 | * Releases a topology reference from @mstb by decrementing | |
1681 | * &drm_dp_mst_branch.topology_kref. | |
1682 | * | |
1683 | * See also: | |
1684 | * drm_dp_mst_topology_try_get_mstb() | |
1685 | * drm_dp_mst_topology_get_mstb() | |
1686 | */ | |
1687 | static void | |
1688 | drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb) | |
1689 | { | |
12a280c7 LP |
1690 | topology_ref_history_lock(mstb->mgr); |
1691 | ||
ebcc0e6b LP |
1692 | DRM_DEBUG("mstb %p (%d)\n", |
1693 | mstb, kref_read(&mstb->topology_kref) - 1); | |
12a280c7 | 1694 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_PUT); |
ad7f8a1f | 1695 | |
12a280c7 | 1696 | topology_ref_history_unlock(mstb->mgr); |
ebcc0e6b | 1697 | kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device); |
ad7f8a1f DA |
1698 | } |
1699 | ||
1700 | static void drm_dp_destroy_port(struct kref *kref) | |
1701 | { | |
ebcc0e6b LP |
1702 | struct drm_dp_mst_port *port = |
1703 | container_of(kref, struct drm_dp_mst_port, topology_kref); | |
ad7f8a1f | 1704 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
df4839fd | 1705 | |
12a280c7 | 1706 | drm_dp_mst_dump_port_topology_history(port); |
6b8eeca6 | 1707 | |
d29333cf LP |
1708 | /* There's nothing that needs locking to destroy an input port yet */ |
1709 | if (port->input) { | |
1710 | drm_dp_mst_put_port_malloc(port); | |
1711 | return; | |
ad7f8a1f | 1712 | } |
d29333cf LP |
1713 | |
1714 | kfree(port->cached_edid); | |
1715 | ||
1716 | /* | |
1717 | * we can't destroy the connector here, as we might be holding the | |
1718 | * mode_config.mutex from an EDID retrieval | |
1719 | */ | |
1720 | mutex_lock(&mgr->delayed_destroy_lock); | |
1721 | list_add(&port->next, &mgr->destroy_port_list); | |
1722 | mutex_unlock(&mgr->delayed_destroy_lock); | |
1723 | schedule_work(&mgr->delayed_destroy_work); | |
ebcc0e6b LP |
1724 | } |
1725 | ||
1726 | /** | |
1727 | * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a | |
1e55a53a | 1728 | * port unless it's zero |
ebcc0e6b LP |
1729 | * @port: &struct drm_dp_mst_port to increment the topology refcount of |
1730 | * | |
1731 | * Attempts to grab a topology reference to @port, if it hasn't yet been | |
1732 | * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached | |
1733 | * 0). Holding a topology reference implies that a malloc reference will be | |
1734 | * held to @port as long as the user holds the topology reference. | |
1735 | * | |
1736 | * Care should be taken to ensure that the user has at least one malloc | |
1737 | * reference to @port. If you already have a topology reference to @port, you | |
1738 | * should use drm_dp_mst_topology_get_port() instead. | |
1739 | * | |
1740 | * See also: | |
1741 | * drm_dp_mst_topology_get_port() | |
1742 | * drm_dp_mst_topology_put_port() | |
1743 | * | |
1744 | * Returns: | |
1745 | * * 1: A topology reference was grabbed successfully | |
1746 | * * 0: @port is no longer in the topology, no reference was grabbed | |
1747 | */ | |
1748 | static int __must_check | |
1749 | drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port) | |
1750 | { | |
12a280c7 | 1751 | int ret; |
ebcc0e6b | 1752 | |
12a280c7 LP |
1753 | topology_ref_history_lock(port->mgr); |
1754 | ret = kref_get_unless_zero(&port->topology_kref); | |
1755 | if (ret) { | |
1756 | DRM_DEBUG("port %p (%d)\n", | |
1757 | port, kref_read(&port->topology_kref)); | |
1758 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET); | |
1759 | } | |
ebcc0e6b | 1760 | |
12a280c7 | 1761 | topology_ref_history_unlock(port->mgr); |
ebcc0e6b | 1762 | return ret; |
ad7f8a1f DA |
1763 | } |
1764 | ||
ebcc0e6b LP |
1765 | /** |
1766 | * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port | |
1767 | * @port: The &struct drm_dp_mst_port to increment the topology refcount of | |
1768 | * | |
1769 | * Increments &drm_dp_mst_port.topology_refcount without checking whether or | |
1770 | * not it's already reached 0. This is only valid to use in scenarios where | |
1771 | * you are already guaranteed to have at least one active topology reference | |
1772 | * to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used. | |
1773 | * | |
1774 | * See also: | |
1775 | * drm_dp_mst_topology_try_get_port() | |
1776 | * drm_dp_mst_topology_put_port() | |
1777 | */ | |
1778 | static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port) | |
1779 | { | |
12a280c7 LP |
1780 | topology_ref_history_lock(port->mgr); |
1781 | ||
ebcc0e6b LP |
1782 | WARN_ON(kref_read(&port->topology_kref) == 0); |
1783 | kref_get(&port->topology_kref); | |
1784 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->topology_kref)); | |
12a280c7 LP |
1785 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET); |
1786 | ||
1787 | topology_ref_history_unlock(port->mgr); | |
ebcc0e6b LP |
1788 | } |
1789 | ||
1790 | /** | |
1791 | * drm_dp_mst_topology_put_port() - release a topology reference to a port | |
1792 | * @port: The &struct drm_dp_mst_port to release the topology reference from | |
1793 | * | |
1794 | * Releases a topology reference from @port by decrementing | |
1795 | * &drm_dp_mst_port.topology_kref. | |
1796 | * | |
1797 | * See also: | |
1798 | * drm_dp_mst_topology_try_get_port() | |
1799 | * drm_dp_mst_topology_get_port() | |
1800 | */ | |
d0757afd | 1801 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port) |
ad7f8a1f | 1802 | { |
12a280c7 LP |
1803 | topology_ref_history_lock(port->mgr); |
1804 | ||
ebcc0e6b LP |
1805 | DRM_DEBUG("port %p (%d)\n", |
1806 | port, kref_read(&port->topology_kref) - 1); | |
12a280c7 LP |
1807 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_PUT); |
1808 | ||
1809 | topology_ref_history_unlock(port->mgr); | |
ebcc0e6b | 1810 | kref_put(&port->topology_kref, drm_dp_destroy_port); |
ad7f8a1f DA |
1811 | } |
1812 | ||
d0757afd LP |
1813 | static struct drm_dp_mst_branch * |
1814 | drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb, | |
1815 | struct drm_dp_mst_branch *to_find) | |
ad7f8a1f DA |
1816 | { |
1817 | struct drm_dp_mst_port *port; | |
1818 | struct drm_dp_mst_branch *rmstb; | |
ebcc0e6b LP |
1819 | |
1820 | if (to_find == mstb) | |
ad7f8a1f | 1821 | return mstb; |
ebcc0e6b | 1822 | |
ad7f8a1f DA |
1823 | list_for_each_entry(port, &mstb->ports, next) { |
1824 | if (port->mstb) { | |
d0757afd LP |
1825 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
1826 | port->mstb, to_find); | |
ad7f8a1f DA |
1827 | if (rmstb) |
1828 | return rmstb; | |
1829 | } | |
1830 | } | |
1831 | return NULL; | |
1832 | } | |
1833 | ||
d0757afd LP |
1834 | static struct drm_dp_mst_branch * |
1835 | drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr, | |
1836 | struct drm_dp_mst_branch *mstb) | |
ad7f8a1f DA |
1837 | { |
1838 | struct drm_dp_mst_branch *rmstb = NULL; | |
ebcc0e6b | 1839 | |
ad7f8a1f | 1840 | mutex_lock(&mgr->lock); |
ebcc0e6b | 1841 | if (mgr->mst_primary) { |
d0757afd LP |
1842 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
1843 | mgr->mst_primary, mstb); | |
ebcc0e6b LP |
1844 | |
1845 | if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb)) | |
1846 | rmstb = NULL; | |
1847 | } | |
ad7f8a1f DA |
1848 | mutex_unlock(&mgr->lock); |
1849 | return rmstb; | |
1850 | } | |
1851 | ||
ebcc0e6b LP |
1852 | static struct drm_dp_mst_port * |
1853 | drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb, | |
1854 | struct drm_dp_mst_port *to_find) | |
ad7f8a1f DA |
1855 | { |
1856 | struct drm_dp_mst_port *port, *mport; | |
1857 | ||
1858 | list_for_each_entry(port, &mstb->ports, next) { | |
ebcc0e6b | 1859 | if (port == to_find) |
ad7f8a1f | 1860 | return port; |
ebcc0e6b | 1861 | |
ad7f8a1f | 1862 | if (port->mstb) { |
ebcc0e6b LP |
1863 | mport = drm_dp_mst_topology_get_port_validated_locked( |
1864 | port->mstb, to_find); | |
ad7f8a1f DA |
1865 | if (mport) |
1866 | return mport; | |
1867 | } | |
1868 | } | |
1869 | return NULL; | |
1870 | } | |
1871 | ||
d0757afd LP |
1872 | static struct drm_dp_mst_port * |
1873 | drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr, | |
1874 | struct drm_dp_mst_port *port) | |
ad7f8a1f DA |
1875 | { |
1876 | struct drm_dp_mst_port *rport = NULL; | |
ebcc0e6b | 1877 | |
ad7f8a1f | 1878 | mutex_lock(&mgr->lock); |
ebcc0e6b LP |
1879 | if (mgr->mst_primary) { |
1880 | rport = drm_dp_mst_topology_get_port_validated_locked( | |
1881 | mgr->mst_primary, port); | |
1882 | ||
1883 | if (rport && !drm_dp_mst_topology_try_get_port(rport)) | |
1884 | rport = NULL; | |
1885 | } | |
ad7f8a1f DA |
1886 | mutex_unlock(&mgr->lock); |
1887 | return rport; | |
1888 | } | |
1889 | ||
1890 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) | |
1891 | { | |
1892 | struct drm_dp_mst_port *port; | |
ebcc0e6b | 1893 | int ret; |
ad7f8a1f DA |
1894 | |
1895 | list_for_each_entry(port, &mstb->ports, next) { | |
1896 | if (port->port_num == port_num) { | |
ebcc0e6b LP |
1897 | ret = drm_dp_mst_topology_try_get_port(port); |
1898 | return ret ? port : NULL; | |
ad7f8a1f DA |
1899 | } |
1900 | } | |
1901 | ||
1902 | return NULL; | |
1903 | } | |
1904 | ||
1905 | /* | |
1906 | * calculate a new RAD for this MST branch device | |
1907 | * if parent has an LCT of 2 then it has 1 nibble of RAD, | |
1908 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, | |
1909 | */ | |
1910 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, | |
1911 | u8 *rad) | |
1912 | { | |
75af4c8c | 1913 | int parent_lct = port->parent->lct; |
ad7f8a1f | 1914 | int shift = 4; |
75af4c8c ML |
1915 | int idx = (parent_lct - 1) / 2; |
1916 | if (parent_lct > 1) { | |
1917 | memcpy(rad, port->parent->rad, idx + 1); | |
1918 | shift = (parent_lct % 2) ? 4 : 0; | |
ad7f8a1f DA |
1919 | } else |
1920 | rad[0] = 0; | |
1921 | ||
1922 | rad[idx] |= port->port_num << shift; | |
75af4c8c | 1923 | return parent_lct + 1; |
ad7f8a1f DA |
1924 | } |
1925 | ||
b2feb1d6 | 1926 | static bool drm_dp_mst_is_end_device(u8 pdt, bool mcs) |
db1a0795 WL |
1927 | { |
1928 | switch (pdt) { | |
1929 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
1930 | case DP_PEER_DEVICE_SST_SINK: | |
1931 | return true; | |
1932 | case DP_PEER_DEVICE_MST_BRANCHING: | |
1933 | /* For sst branch device */ | |
1934 | if (!mcs) | |
1935 | return true; | |
1936 | ||
1937 | return false; | |
1938 | } | |
1939 | return true; | |
1940 | } | |
1941 | ||
1942 | static int | |
1943 | drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt, | |
1944 | bool new_mcs) | |
ad7f8a1f | 1945 | { |
c485e2c9 LP |
1946 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
1947 | struct drm_dp_mst_branch *mstb; | |
1948 | u8 rad[8], lct; | |
1949 | int ret = 0; | |
1950 | ||
db1a0795 | 1951 | if (port->pdt == new_pdt && port->mcs == new_mcs) |
c485e2c9 LP |
1952 | return 0; |
1953 | ||
1954 | /* Teardown the old pdt, if there is one */ | |
db1a0795 | 1955 | if (port->pdt != DP_PEER_DEVICE_NONE) { |
b2feb1d6 | 1956 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
db1a0795 WL |
1957 | /* |
1958 | * If the new PDT would also have an i2c bus, | |
1959 | * don't bother with reregistering it | |
1960 | */ | |
1961 | if (new_pdt != DP_PEER_DEVICE_NONE && | |
b2feb1d6 | 1962 | drm_dp_mst_is_end_device(new_pdt, new_mcs)) { |
db1a0795 WL |
1963 | port->pdt = new_pdt; |
1964 | port->mcs = new_mcs; | |
1965 | return 0; | |
1966 | } | |
c485e2c9 | 1967 | |
db1a0795 WL |
1968 | /* remove i2c over sideband */ |
1969 | drm_dp_mst_unregister_i2c_bus(&port->aux); | |
1970 | } else { | |
1971 | mutex_lock(&mgr->lock); | |
1972 | drm_dp_mst_topology_put_mstb(port->mstb); | |
1973 | port->mstb = NULL; | |
1974 | mutex_unlock(&mgr->lock); | |
1975 | } | |
c485e2c9 LP |
1976 | } |
1977 | ||
1978 | port->pdt = new_pdt; | |
db1a0795 | 1979 | port->mcs = new_mcs; |
c485e2c9 | 1980 | |
db1a0795 | 1981 | if (port->pdt != DP_PEER_DEVICE_NONE) { |
b2feb1d6 | 1982 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
db1a0795 WL |
1983 | /* add i2c over sideband */ |
1984 | ret = drm_dp_mst_register_i2c_bus(&port->aux); | |
1985 | } else { | |
1986 | lct = drm_dp_calculate_rad(port, rad); | |
1987 | mstb = drm_dp_add_mst_branch_device(lct, rad); | |
1988 | if (!mstb) { | |
1989 | ret = -ENOMEM; | |
1990 | DRM_ERROR("Failed to create MSTB for port %p", | |
1991 | port); | |
1992 | goto out; | |
1993 | } | |
ad7f8a1f | 1994 | |
db1a0795 WL |
1995 | mutex_lock(&mgr->lock); |
1996 | port->mstb = mstb; | |
1997 | mstb->mgr = port->mgr; | |
1998 | mstb->port_parent = port; | |
ad7f8a1f | 1999 | |
db1a0795 WL |
2000 | /* |
2001 | * Make sure this port's memory allocation stays | |
2002 | * around until its child MSTB releases it | |
2003 | */ | |
2004 | drm_dp_mst_get_port_malloc(port); | |
2005 | mutex_unlock(&mgr->lock); | |
c485e2c9 | 2006 | |
db1a0795 WL |
2007 | /* And make sure we send a link address for this */ |
2008 | ret = 1; | |
2009 | } | |
ad7f8a1f | 2010 | } |
c485e2c9 LP |
2011 | |
2012 | out: | |
2013 | if (ret < 0) | |
2014 | port->pdt = DP_PEER_DEVICE_NONE; | |
2015 | return ret; | |
ad7f8a1f DA |
2016 | } |
2017 | ||
562836a2 VS |
2018 | /** |
2019 | * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband | |
2020 | * @aux: Fake sideband AUX CH | |
2021 | * @offset: address of the (first) register to read | |
2022 | * @buffer: buffer to store the register values | |
2023 | * @size: number of bytes in @buffer | |
2024 | * | |
2025 | * Performs the same functionality for remote devices via | |
2026 | * sideband messaging as drm_dp_dpcd_read() does for local | |
2027 | * devices via actual AUX CH. | |
2028 | * | |
2029 | * Return: Number of bytes read, or negative error code on failure. | |
2030 | */ | |
2031 | ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, | |
2032 | unsigned int offset, void *buffer, size_t size) | |
2033 | { | |
2034 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, | |
2035 | aux); | |
2036 | ||
2037 | return drm_dp_send_dpcd_read(port->mgr, port, | |
2038 | offset, size, buffer); | |
2039 | } | |
2040 | ||
2041 | /** | |
2042 | * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband | |
2043 | * @aux: Fake sideband AUX CH | |
2044 | * @offset: address of the (first) register to write | |
2045 | * @buffer: buffer containing the values to write | |
2046 | * @size: number of bytes in @buffer | |
2047 | * | |
2048 | * Performs the same functionality for remote devices via | |
2049 | * sideband messaging as drm_dp_dpcd_write() does for local | |
2050 | * devices via actual AUX CH. | |
2051 | * | |
4c0a9b62 | 2052 | * Return: number of bytes written on success, negative error code on failure. |
562836a2 VS |
2053 | */ |
2054 | ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, | |
2055 | unsigned int offset, void *buffer, size_t size) | |
2056 | { | |
2057 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, | |
2058 | aux); | |
2059 | ||
2060 | return drm_dp_send_dpcd_write(port->mgr, port, | |
2061 | offset, size, buffer); | |
2062 | } | |
2063 | ||
cb897542 | 2064 | static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
ad7f8a1f | 2065 | { |
cb897542 | 2066 | int ret = 0; |
5e93b820 HW |
2067 | |
2068 | memcpy(mstb->guid, guid, 16); | |
2069 | ||
2070 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { | |
2071 | if (mstb->port_parent) { | |
cb897542 BG |
2072 | ret = drm_dp_send_dpcd_write(mstb->mgr, |
2073 | mstb->port_parent, | |
2074 | DP_GUID, 16, mstb->guid); | |
5e93b820 | 2075 | } else { |
cb897542 BG |
2076 | ret = drm_dp_dpcd_write(mstb->mgr->aux, |
2077 | DP_GUID, mstb->guid, 16); | |
ad7f8a1f DA |
2078 | } |
2079 | } | |
cb897542 | 2080 | |
94b6ada4 LP |
2081 | if (ret < 16 && ret > 0) |
2082 | return -EPROTO; | |
2083 | ||
2084 | return ret == 16 ? 0 : ret; | |
ad7f8a1f DA |
2085 | } |
2086 | ||
1c960876 DA |
2087 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
2088 | int pnum, | |
d87af4d1 RS |
2089 | char *proppath, |
2090 | size_t proppath_size) | |
ad7f8a1f DA |
2091 | { |
2092 | int i; | |
2093 | char temp[8]; | |
d87af4d1 | 2094 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
ad7f8a1f DA |
2095 | for (i = 0; i < (mstb->lct - 1); i++) { |
2096 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 2097 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
d87af4d1 RS |
2098 | snprintf(temp, sizeof(temp), "-%d", port_num); |
2099 | strlcat(proppath, temp, proppath_size); | |
ad7f8a1f | 2100 | } |
1c960876 | 2101 | snprintf(temp, sizeof(temp), "-%d", pnum); |
d87af4d1 | 2102 | strlcat(proppath, temp, proppath_size); |
ad7f8a1f DA |
2103 | } |
2104 | ||
562836a2 VS |
2105 | /** |
2106 | * drm_dp_mst_connector_late_register() - Late MST connector registration | |
63b87c31 | 2107 | * @connector: The MST connector |
562836a2 VS |
2108 | * @port: The MST port for this connector |
2109 | * | |
2110 | * Helper to register the remote aux device for this MST port. Drivers should | |
2111 | * call this from their mst connector's late_register hook to enable MST aux | |
2112 | * devices. | |
2113 | * | |
2114 | * Return: 0 on success, negative error code on failure. | |
2115 | */ | |
2116 | int drm_dp_mst_connector_late_register(struct drm_connector *connector, | |
2117 | struct drm_dp_mst_port *port) | |
2118 | { | |
2119 | DRM_DEBUG_KMS("registering %s remote bus for %s\n", | |
2120 | port->aux.name, connector->kdev->kobj.name); | |
2121 | ||
2122 | port->aux.dev = connector->kdev; | |
2123 | return drm_dp_aux_register_devnode(&port->aux); | |
2124 | } | |
2125 | EXPORT_SYMBOL(drm_dp_mst_connector_late_register); | |
2126 | ||
2127 | /** | |
2128 | * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration | |
63b87c31 | 2129 | * @connector: The MST connector |
562836a2 VS |
2130 | * @port: The MST port for this connector |
2131 | * | |
2132 | * Helper to unregister the remote aux device for this MST port, registered by | |
2133 | * drm_dp_mst_connector_late_register(). Drivers should call this from their mst | |
2134 | * connector's early_unregister hook. | |
2135 | */ | |
2136 | void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, | |
2137 | struct drm_dp_mst_port *port) | |
2138 | { | |
2139 | DRM_DEBUG_KMS("unregistering %s remote bus for %s\n", | |
2140 | port->aux.name, connector->kdev->kobj.name); | |
2141 | drm_dp_aux_unregister_devnode(&port->aux); | |
2142 | } | |
2143 | EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister); | |
2144 | ||
e2839ff6 | 2145 | static void |
3f9b3f02 LP |
2146 | drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb, |
2147 | struct drm_dp_mst_port *port) | |
2148 | { | |
2149 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
2150 | char proppath[255]; | |
2151 | int ret; | |
2152 | ||
2153 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); | |
2154 | port->connector = mgr->cbs->add_connector(mgr, port, proppath); | |
2155 | if (!port->connector) { | |
2156 | ret = -ENOMEM; | |
2157 | goto error; | |
2158 | } | |
2159 | ||
db1a0795 | 2160 | if (port->pdt != DP_PEER_DEVICE_NONE && |
b2feb1d6 | 2161 | drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
3f9b3f02 LP |
2162 | port->cached_edid = drm_get_edid(port->connector, |
2163 | &port->aux.ddc); | |
2164 | drm_connector_set_tile_property(port->connector); | |
2165 | } | |
2166 | ||
f8d97d98 | 2167 | drm_connector_register(port->connector); |
3f9b3f02 LP |
2168 | return; |
2169 | ||
2170 | error: | |
2171 | DRM_ERROR("Failed to create connector for port %p: %d\n", port, ret); | |
2172 | } | |
2173 | ||
2174 | /* | |
2175 | * Drop a topology reference, and unlink the port from the in-memory topology | |
2176 | * layout | |
2177 | */ | |
2178 | static void | |
2179 | drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr, | |
2180 | struct drm_dp_mst_port *port) | |
2181 | { | |
2182 | mutex_lock(&mgr->lock); | |
b1dee9a7 | 2183 | port->parent->num_ports--; |
3f9b3f02 LP |
2184 | list_del(&port->next); |
2185 | mutex_unlock(&mgr->lock); | |
2186 | drm_dp_mst_topology_put_port(port); | |
2187 | } | |
2188 | ||
2189 | static struct drm_dp_mst_port * | |
2190 | drm_dp_mst_add_port(struct drm_device *dev, | |
2191 | struct drm_dp_mst_topology_mgr *mgr, | |
2192 | struct drm_dp_mst_branch *mstb, u8 port_number) | |
2193 | { | |
2194 | struct drm_dp_mst_port *port = kzalloc(sizeof(*port), GFP_KERNEL); | |
2195 | ||
2196 | if (!port) | |
2197 | return NULL; | |
2198 | ||
2199 | kref_init(&port->topology_kref); | |
2200 | kref_init(&port->malloc_kref); | |
2201 | port->parent = mstb; | |
2202 | port->port_num = port_number; | |
2203 | port->mgr = mgr; | |
2204 | port->aux.name = "DPMST"; | |
2205 | port->aux.dev = dev->dev; | |
2206 | port->aux.is_remote = true; | |
2207 | ||
c908b1c4 DDZ |
2208 | /* initialize the MST downstream port's AUX crc work queue */ |
2209 | drm_dp_remote_aux_init(&port->aux); | |
2210 | ||
3f9b3f02 LP |
2211 | /* |
2212 | * Make sure the memory allocation for our parent branch stays | |
2213 | * around until our own memory allocation is released | |
2214 | */ | |
2215 | drm_dp_mst_get_mstb_malloc(mstb); | |
2216 | ||
2217 | return port; | |
2218 | } | |
2219 | ||
6f85f738 | 2220 | static int |
e2839ff6 LP |
2221 | drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, |
2222 | struct drm_device *dev, | |
2223 | struct drm_dp_link_addr_reply_port *port_msg) | |
ad7f8a1f | 2224 | { |
c485e2c9 | 2225 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
ad7f8a1f | 2226 | struct drm_dp_mst_port *port; |
3f9b3f02 LP |
2227 | int old_ddps = 0, ret; |
2228 | u8 new_pdt = DP_PEER_DEVICE_NONE; | |
db1a0795 | 2229 | bool new_mcs = 0; |
6f85f738 | 2230 | bool created = false, send_link_addr = false, changed = false; |
ebcc0e6b | 2231 | |
ad7f8a1f DA |
2232 | port = drm_dp_get_port(mstb, port_msg->port_number); |
2233 | if (!port) { | |
3f9b3f02 LP |
2234 | port = drm_dp_mst_add_port(dev, mgr, mstb, |
2235 | port_msg->port_number); | |
ad7f8a1f | 2236 | if (!port) |
6f85f738 | 2237 | return -ENOMEM; |
3f9b3f02 | 2238 | created = true; |
6f85f738 LP |
2239 | changed = true; |
2240 | } else if (!port->input && port_msg->input_port && port->connector) { | |
2241 | /* Since port->connector can't be changed here, we create a | |
2242 | * new port if input_port changes from 0 to 1 | |
ebcc0e6b | 2243 | */ |
3f9b3f02 LP |
2244 | drm_dp_mst_topology_unlink_port(mgr, port); |
2245 | drm_dp_mst_topology_put_port(port); | |
3f9b3f02 LP |
2246 | port = drm_dp_mst_add_port(dev, mgr, mstb, |
2247 | port_msg->port_number); | |
2248 | if (!port) | |
6f85f738 LP |
2249 | return -ENOMEM; |
2250 | changed = true; | |
ad7f8a1f | 2251 | created = true; |
6f85f738 LP |
2252 | } else if (port->input && !port_msg->input_port) { |
2253 | changed = true; | |
2254 | } else if (port->connector) { | |
2255 | /* We're updating a port that's exposed to userspace, so do it | |
2256 | * under lock | |
3f9b3f02 LP |
2257 | */ |
2258 | drm_modeset_lock(&mgr->base.lock, NULL); | |
6f85f738 | 2259 | |
ad7f8a1f | 2260 | old_ddps = port->ddps; |
6f85f738 LP |
2261 | changed = port->ddps != port_msg->ddps || |
2262 | (port->ddps && | |
2263 | (port->ldps != port_msg->legacy_device_plug_status || | |
2264 | port->dpcd_rev != port_msg->dpcd_revision || | |
2265 | port->mcs != port_msg->mcs || | |
2266 | port->pdt != port_msg->peer_device_type || | |
2267 | port->num_sdp_stream_sinks != | |
2268 | port_msg->num_sdp_stream_sinks)); | |
ad7f8a1f DA |
2269 | } |
2270 | ||
ad7f8a1f | 2271 | port->input = port_msg->input_port; |
3f9b3f02 LP |
2272 | if (!port->input) |
2273 | new_pdt = port_msg->peer_device_type; | |
db1a0795 | 2274 | new_mcs = port_msg->mcs; |
ad7f8a1f DA |
2275 | port->ddps = port_msg->ddps; |
2276 | port->ldps = port_msg->legacy_device_plug_status; | |
2277 | port->dpcd_rev = port_msg->dpcd_revision; | |
2278 | port->num_sdp_streams = port_msg->num_sdp_streams; | |
2279 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; | |
ad7f8a1f DA |
2280 | |
2281 | /* manage mstb port lists with mgr lock - take a reference | |
2282 | for this list */ | |
2283 | if (created) { | |
c485e2c9 | 2284 | mutex_lock(&mgr->lock); |
ebcc0e6b | 2285 | drm_dp_mst_topology_get_port(port); |
ad7f8a1f | 2286 | list_add(&port->next, &mstb->ports); |
b1dee9a7 | 2287 | mstb->num_ports++; |
c485e2c9 | 2288 | mutex_unlock(&mgr->lock); |
ad7f8a1f DA |
2289 | } |
2290 | ||
87212b51 LP |
2291 | /* |
2292 | * Reprobe PBN caps on both hotplug, and when re-probing the link | |
2293 | * for our parent mstb | |
2294 | */ | |
2295 | if (old_ddps != port->ddps || !created) { | |
2296 | if (port->ddps && !port->input) { | |
2297 | ret = drm_dp_send_enum_path_resources(mgr, mstb, | |
2298 | port); | |
2299 | if (ret == 1) | |
2300 | changed = true; | |
ad7f8a1f | 2301 | } else { |
fcf46380 | 2302 | port->full_pbn = 0; |
3d76df63 | 2303 | } |
ad7f8a1f DA |
2304 | } |
2305 | ||
db1a0795 | 2306 | ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); |
3f9b3f02 LP |
2307 | if (ret == 1) { |
2308 | send_link_addr = true; | |
2309 | } else if (ret < 0) { | |
2310 | DRM_ERROR("Failed to change PDT on port %p: %d\n", | |
2311 | port, ret); | |
2312 | goto fail; | |
ad7f8a1f DA |
2313 | } |
2314 | ||
6f85f738 LP |
2315 | /* |
2316 | * If this port wasn't just created, then we're reprobing because | |
2317 | * we're coming out of suspend. In this case, always resend the link | |
2318 | * address if there's an MSTB on this port | |
2319 | */ | |
db1a0795 WL |
2320 | if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING && |
2321 | port->mcs) | |
6f85f738 LP |
2322 | send_link_addr = true; |
2323 | ||
2324 | if (port->connector) | |
3f9b3f02 | 2325 | drm_modeset_unlock(&mgr->base.lock); |
6f85f738 | 2326 | else if (!port->input) |
3f9b3f02 | 2327 | drm_dp_mst_port_add_connector(mstb, port); |
c485e2c9 | 2328 | |
6f85f738 LP |
2329 | if (send_link_addr && port->mstb) { |
2330 | ret = drm_dp_send_link_address(mgr, port->mstb); | |
2331 | if (ret == 1) /* MSTB below us changed */ | |
2332 | changed = true; | |
2333 | else if (ret < 0) | |
2334 | goto fail_put; | |
ad7f8a1f | 2335 | } |
8ae22cb4 | 2336 | |
ad7f8a1f | 2337 | /* put reference to this port */ |
d0757afd | 2338 | drm_dp_mst_topology_put_port(port); |
6f85f738 | 2339 | return changed; |
c485e2c9 LP |
2340 | |
2341 | fail: | |
3f9b3f02 | 2342 | drm_dp_mst_topology_unlink_port(mgr, port); |
6f85f738 | 2343 | if (port->connector) |
3f9b3f02 | 2344 | drm_modeset_unlock(&mgr->base.lock); |
6f85f738 LP |
2345 | fail_put: |
2346 | drm_dp_mst_topology_put_port(port); | |
2347 | return ret; | |
ad7f8a1f DA |
2348 | } |
2349 | ||
e2839ff6 LP |
2350 | static void |
2351 | drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb, | |
2352 | struct drm_dp_connection_status_notify *conn_stat) | |
ad7f8a1f | 2353 | { |
3f9b3f02 | 2354 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
ad7f8a1f | 2355 | struct drm_dp_mst_port *port; |
7617e962 | 2356 | int old_ddps, old_input, ret, i; |
dad7d84f | 2357 | u8 new_pdt; |
db1a0795 | 2358 | bool new_mcs; |
dad7d84f | 2359 | bool dowork = false, create_connector = false; |
c485e2c9 | 2360 | |
ad7f8a1f DA |
2361 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
2362 | if (!port) | |
2363 | return; | |
2364 | ||
dad7d84f LP |
2365 | if (port->connector) { |
2366 | if (!port->input && conn_stat->input_port) { | |
2367 | /* | |
2368 | * We can't remove a connector from an already exposed | |
2369 | * port, so just throw the port out and make sure we | |
2370 | * reprobe the link address of it's parent MSTB | |
2371 | */ | |
2372 | drm_dp_mst_topology_unlink_port(mgr, port); | |
2373 | mstb->link_address_sent = false; | |
2374 | dowork = true; | |
2375 | goto out; | |
2376 | } | |
2377 | ||
2378 | /* Locking is only needed if the port's exposed to userspace */ | |
3f9b3f02 | 2379 | drm_modeset_lock(&mgr->base.lock, NULL); |
dad7d84f LP |
2380 | } else if (port->input && !conn_stat->input_port) { |
2381 | create_connector = true; | |
2382 | /* Reprobe link address so we get num_sdp_streams */ | |
2383 | mstb->link_address_sent = false; | |
2384 | dowork = true; | |
2385 | } | |
3f9b3f02 | 2386 | |
ad7f8a1f | 2387 | old_ddps = port->ddps; |
7617e962 | 2388 | old_input = port->input; |
dad7d84f | 2389 | port->input = conn_stat->input_port; |
ad7f8a1f DA |
2390 | port->ldps = conn_stat->legacy_device_plug_status; |
2391 | port->ddps = conn_stat->displayport_device_plug_status; | |
2392 | ||
2393 | if (old_ddps != port->ddps) { | |
87212b51 LP |
2394 | if (port->ddps && !port->input) |
2395 | drm_dp_send_enum_path_resources(mgr, mstb, port); | |
2396 | else | |
fcf46380 | 2397 | port->full_pbn = 0; |
ad7f8a1f | 2398 | } |
ad7f8a1f | 2399 | |
dad7d84f | 2400 | new_pdt = port->input ? DP_PEER_DEVICE_NONE : conn_stat->peer_device_type; |
db1a0795 WL |
2401 | new_mcs = conn_stat->message_capability_status; |
2402 | ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); | |
dad7d84f LP |
2403 | if (ret == 1) { |
2404 | dowork = true; | |
2405 | } else if (ret < 0) { | |
2406 | DRM_ERROR("Failed to change PDT for port %p: %d\n", | |
2407 | port, ret); | |
2408 | dowork = false; | |
ad7f8a1f DA |
2409 | } |
2410 | ||
7617e962 WL |
2411 | if (!old_input && old_ddps != port->ddps && !port->ddps) { |
2412 | for (i = 0; i < mgr->max_payloads; i++) { | |
2413 | struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; | |
2414 | struct drm_dp_mst_port *port_validated; | |
2415 | ||
2416 | if (!vcpi) | |
2417 | continue; | |
2418 | ||
2419 | port_validated = | |
2420 | container_of(vcpi, struct drm_dp_mst_port, vcpi); | |
2421 | port_validated = | |
2422 | drm_dp_mst_topology_get_port_validated(mgr, port_validated); | |
2423 | if (!port_validated) { | |
2424 | mutex_lock(&mgr->payload_lock); | |
2425 | vcpi->num_slots = 0; | |
2426 | mutex_unlock(&mgr->payload_lock); | |
2427 | } else { | |
2428 | drm_dp_mst_topology_put_port(port_validated); | |
2429 | } | |
2430 | } | |
2431 | } | |
2432 | ||
3f9b3f02 LP |
2433 | if (port->connector) |
2434 | drm_modeset_unlock(&mgr->base.lock); | |
dad7d84f LP |
2435 | else if (create_connector) |
2436 | drm_dp_mst_port_add_connector(mstb, port); | |
3f9b3f02 | 2437 | |
dad7d84f | 2438 | out: |
d0757afd | 2439 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
2440 | if (dowork) |
2441 | queue_work(system_long_wq, &mstb->mgr->work); | |
ad7f8a1f DA |
2442 | } |
2443 | ||
2444 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, | |
2445 | u8 lct, u8 *rad) | |
2446 | { | |
2447 | struct drm_dp_mst_branch *mstb; | |
2448 | struct drm_dp_mst_port *port; | |
ebcc0e6b | 2449 | int i, ret; |
ad7f8a1f | 2450 | /* find the port by iterating down */ |
9eb1e57f DA |
2451 | |
2452 | mutex_lock(&mgr->lock); | |
ad7f8a1f DA |
2453 | mstb = mgr->mst_primary; |
2454 | ||
23d80039 SL |
2455 | if (!mstb) |
2456 | goto out; | |
2457 | ||
ad7f8a1f DA |
2458 | for (i = 0; i < lct - 1; i++) { |
2459 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 2460 | int port_num = (rad[i / 2] >> shift) & 0xf; |
ad7f8a1f DA |
2461 | |
2462 | list_for_each_entry(port, &mstb->ports, next) { | |
2463 | if (port->port_num == port_num) { | |
30730c7f AR |
2464 | mstb = port->mstb; |
2465 | if (!mstb) { | |
ad7f8a1f | 2466 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
30730c7f | 2467 | goto out; |
ad7f8a1f DA |
2468 | } |
2469 | ||
ad7f8a1f DA |
2470 | break; |
2471 | } | |
2472 | } | |
2473 | } | |
ebcc0e6b LP |
2474 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
2475 | if (!ret) | |
2476 | mstb = NULL; | |
30730c7f | 2477 | out: |
9eb1e57f | 2478 | mutex_unlock(&mgr->lock); |
ad7f8a1f DA |
2479 | return mstb; |
2480 | } | |
2481 | ||
bd934320 ML |
2482 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
2483 | struct drm_dp_mst_branch *mstb, | |
fde61a7a | 2484 | const uint8_t *guid) |
bd934320 ML |
2485 | { |
2486 | struct drm_dp_mst_branch *found_mstb; | |
2487 | struct drm_dp_mst_port *port; | |
2488 | ||
5e93b820 HW |
2489 | if (memcmp(mstb->guid, guid, 16) == 0) |
2490 | return mstb; | |
2491 | ||
2492 | ||
bd934320 ML |
2493 | list_for_each_entry(port, &mstb->ports, next) { |
2494 | if (!port->mstb) | |
2495 | continue; | |
2496 | ||
bd934320 ML |
2497 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
2498 | ||
2499 | if (found_mstb) | |
2500 | return found_mstb; | |
2501 | } | |
2502 | ||
2503 | return NULL; | |
2504 | } | |
2505 | ||
de6d6818 LP |
2506 | static struct drm_dp_mst_branch * |
2507 | drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, | |
fde61a7a | 2508 | const uint8_t *guid) |
bd934320 ML |
2509 | { |
2510 | struct drm_dp_mst_branch *mstb; | |
ebcc0e6b | 2511 | int ret; |
bd934320 ML |
2512 | |
2513 | /* find the port by iterating down */ | |
2514 | mutex_lock(&mgr->lock); | |
2515 | ||
5e93b820 | 2516 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
ebcc0e6b LP |
2517 | if (mstb) { |
2518 | ret = drm_dp_mst_topology_try_get_mstb(mstb); | |
2519 | if (!ret) | |
2520 | mstb = NULL; | |
2521 | } | |
bd934320 ML |
2522 | |
2523 | mutex_unlock(&mgr->lock); | |
2524 | return mstb; | |
2525 | } | |
2526 | ||
6f85f738 | 2527 | static int drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
ad7f8a1f DA |
2528 | struct drm_dp_mst_branch *mstb) |
2529 | { | |
2530 | struct drm_dp_mst_port *port; | |
6f85f738 LP |
2531 | int ret; |
2532 | bool changed = false; | |
14692a36 | 2533 | |
6f85f738 LP |
2534 | if (!mstb->link_address_sent) { |
2535 | ret = drm_dp_send_link_address(mgr, mstb); | |
2536 | if (ret == 1) | |
2537 | changed = true; | |
2538 | else if (ret < 0) | |
2539 | return ret; | |
2540 | } | |
68d8c9fc | 2541 | |
ad7f8a1f | 2542 | list_for_each_entry(port, &mstb->ports, next) { |
14692a36 | 2543 | struct drm_dp_mst_branch *mstb_child = NULL; |
ad7f8a1f | 2544 | |
14692a36 | 2545 | if (port->input || !port->ddps) |
ad7f8a1f DA |
2546 | continue; |
2547 | ||
14692a36 | 2548 | if (port->mstb) |
d0757afd LP |
2549 | mstb_child = drm_dp_mst_topology_get_mstb_validated( |
2550 | mgr, port->mstb); | |
14692a36 LP |
2551 | |
2552 | if (mstb_child) { | |
6f85f738 LP |
2553 | ret = drm_dp_check_and_send_link_address(mgr, |
2554 | mstb_child); | |
14692a36 | 2555 | drm_dp_mst_topology_put_mstb(mstb_child); |
6f85f738 LP |
2556 | if (ret == 1) |
2557 | changed = true; | |
2558 | else if (ret < 0) | |
2559 | return ret; | |
9254ec49 | 2560 | } |
ad7f8a1f | 2561 | } |
6f85f738 LP |
2562 | |
2563 | return changed; | |
ad7f8a1f DA |
2564 | } |
2565 | ||
2566 | static void drm_dp_mst_link_probe_work(struct work_struct *work) | |
2567 | { | |
14692a36 LP |
2568 | struct drm_dp_mst_topology_mgr *mgr = |
2569 | container_of(work, struct drm_dp_mst_topology_mgr, work); | |
2570 | struct drm_device *dev = mgr->dev; | |
9254ec49 | 2571 | struct drm_dp_mst_branch *mstb; |
ebcc0e6b | 2572 | int ret; |
f7948907 | 2573 | bool clear_payload_id_table; |
ad7f8a1f | 2574 | |
14692a36 LP |
2575 | mutex_lock(&mgr->probe_lock); |
2576 | ||
9254ec49 | 2577 | mutex_lock(&mgr->lock); |
f7948907 SP |
2578 | clear_payload_id_table = !mgr->payload_id_table_cleared; |
2579 | mgr->payload_id_table_cleared = true; | |
2580 | ||
9254ec49 DV |
2581 | mstb = mgr->mst_primary; |
2582 | if (mstb) { | |
ebcc0e6b LP |
2583 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
2584 | if (!ret) | |
2585 | mstb = NULL; | |
9254ec49 DV |
2586 | } |
2587 | mutex_unlock(&mgr->lock); | |
3f9b3f02 LP |
2588 | if (!mstb) { |
2589 | mutex_unlock(&mgr->probe_lock); | |
2590 | return; | |
9254ec49 | 2591 | } |
3f9b3f02 | 2592 | |
f7948907 SP |
2593 | /* |
2594 | * Certain branch devices seem to incorrectly report an available_pbn | |
2595 | * of 0 on downstream sinks, even after clearing the | |
2596 | * DP_PAYLOAD_ALLOCATE_* registers in | |
2597 | * drm_dp_mst_topology_mgr_set_mst(). Namely, the CableMatters USB-C | |
2598 | * 2x DP hub. Sending a CLEAR_PAYLOAD_ID_TABLE message seems to make | |
2599 | * things work again. | |
2600 | */ | |
2601 | if (clear_payload_id_table) { | |
2602 | DRM_DEBUG_KMS("Clearing payload ID table\n"); | |
2603 | drm_dp_send_clear_payload_id_table(mgr, mstb); | |
9254ec49 | 2604 | } |
f7948907 | 2605 | |
6f85f738 | 2606 | ret = drm_dp_check_and_send_link_address(mgr, mstb); |
3f9b3f02 LP |
2607 | drm_dp_mst_topology_put_mstb(mstb); |
2608 | ||
14692a36 | 2609 | mutex_unlock(&mgr->probe_lock); |
6f85f738 LP |
2610 | if (ret) |
2611 | drm_kms_helper_hotplug_event(dev); | |
ad7f8a1f DA |
2612 | } |
2613 | ||
2614 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
2615 | u8 *guid) | |
2616 | { | |
e38e1289 | 2617 | u64 salt; |
ad7f8a1f | 2618 | |
e38e1289 VS |
2619 | if (memchr_inv(guid, 0, 16)) |
2620 | return true; | |
2621 | ||
2622 | salt = get_jiffies_64(); | |
2623 | ||
2624 | memcpy(&guid[0], &salt, sizeof(u64)); | |
2625 | memcpy(&guid[8], &salt, sizeof(u64)); | |
2626 | ||
2627 | return false; | |
ad7f8a1f DA |
2628 | } |
2629 | ||
cb897542 BG |
2630 | static void build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, |
2631 | u8 port_num, u32 offset, u8 num_bytes) | |
ad7f8a1f DA |
2632 | { |
2633 | struct drm_dp_sideband_msg_req_body req; | |
2634 | ||
2635 | req.req_type = DP_REMOTE_DPCD_READ; | |
2636 | req.u.dpcd_read.port_number = port_num; | |
2637 | req.u.dpcd_read.dpcd_address = offset; | |
2638 | req.u.dpcd_read.num_bytes = num_bytes; | |
2639 | drm_dp_encode_sideband_req(&req, msg); | |
ad7f8a1f | 2640 | } |
ad7f8a1f DA |
2641 | |
2642 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, | |
2643 | bool up, u8 *msg, int len) | |
2644 | { | |
2645 | int ret; | |
2646 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; | |
2647 | int tosend, total, offset; | |
2648 | int retries = 0; | |
2649 | ||
2650 | retry: | |
2651 | total = len; | |
2652 | offset = 0; | |
2653 | do { | |
2654 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); | |
2655 | ||
2656 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, | |
2657 | &msg[offset], | |
2658 | tosend); | |
2659 | if (ret != tosend) { | |
2660 | if (ret == -EIO && retries < 5) { | |
2661 | retries++; | |
2662 | goto retry; | |
2663 | } | |
2664 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); | |
ad7f8a1f DA |
2665 | |
2666 | return -EIO; | |
2667 | } | |
2668 | offset += tosend; | |
2669 | total -= tosend; | |
2670 | } while (total > 0); | |
2671 | return 0; | |
2672 | } | |
2673 | ||
2674 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, | |
2675 | struct drm_dp_sideband_msg_tx *txmsg) | |
2676 | { | |
2677 | struct drm_dp_mst_branch *mstb = txmsg->dst; | |
bd934320 | 2678 | u8 req_type; |
ad7f8a1f | 2679 | |
bd934320 ML |
2680 | req_type = txmsg->msg[0] & 0x7f; |
2681 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || | |
2682 | req_type == DP_RESOURCE_STATUS_NOTIFY) | |
2683 | hdr->broadcast = 1; | |
2684 | else | |
2685 | hdr->broadcast = 0; | |
ad7f8a1f DA |
2686 | hdr->path_msg = txmsg->path_msg; |
2687 | hdr->lct = mstb->lct; | |
2688 | hdr->lcr = mstb->lct - 1; | |
2689 | if (mstb->lct > 1) | |
2690 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); | |
d308a881 | 2691 | |
ad7f8a1f DA |
2692 | return 0; |
2693 | } | |
2694 | /* | |
2695 | * process a single block of the next message in the sideband queue | |
2696 | */ | |
2697 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, | |
2698 | struct drm_dp_sideband_msg_tx *txmsg, | |
2699 | bool up) | |
2700 | { | |
2701 | u8 chunk[48]; | |
2702 | struct drm_dp_sideband_msg_hdr hdr; | |
2703 | int len, space, idx, tosend; | |
2704 | int ret; | |
2705 | ||
d308a881 LP |
2706 | if (txmsg->state == DRM_DP_SIDEBAND_TX_SENT) |
2707 | return 0; | |
2708 | ||
bf3719c0 DL |
2709 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
2710 | ||
d308a881 | 2711 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) |
ad7f8a1f | 2712 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
ad7f8a1f | 2713 | |
d308a881 | 2714 | /* make hdr from dst mst */ |
ad7f8a1f DA |
2715 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
2716 | if (ret < 0) | |
2717 | return ret; | |
2718 | ||
2719 | /* amount left to send in this message */ | |
2720 | len = txmsg->cur_len - txmsg->cur_offset; | |
2721 | ||
2722 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ | |
2723 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); | |
2724 | ||
2725 | tosend = min(len, space); | |
2726 | if (len == txmsg->cur_len) | |
2727 | hdr.somt = 1; | |
2728 | if (space >= len) | |
2729 | hdr.eomt = 1; | |
2730 | ||
2731 | ||
2732 | hdr.msg_len = tosend + 1; | |
2733 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); | |
2734 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); | |
2735 | /* add crc at end */ | |
2736 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); | |
2737 | idx += tosend + 1; | |
2738 | ||
2739 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); | |
f0a8f533 | 2740 | if (unlikely(ret) && drm_debug_enabled(DRM_UT_DP)) { |
2f015ec6 LP |
2741 | struct drm_printer p = drm_debug_printer(DBG_PREFIX); |
2742 | ||
2743 | drm_printf(&p, "sideband msg failed to send\n"); | |
2744 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); | |
ad7f8a1f DA |
2745 | return ret; |
2746 | } | |
2747 | ||
2748 | txmsg->cur_offset += tosend; | |
2749 | if (txmsg->cur_offset == txmsg->cur_len) { | |
2750 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; | |
2751 | return 1; | |
2752 | } | |
2753 | return 0; | |
2754 | } | |
2755 | ||
ad7f8a1f DA |
2756 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
2757 | { | |
2758 | struct drm_dp_sideband_msg_tx *txmsg; | |
2759 | int ret; | |
2760 | ||
cd961bb9 DV |
2761 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
2762 | ||
ad7f8a1f | 2763 | /* construct a chunk from the first msg in the tx_msg queue */ |
cb021a3e | 2764 | if (list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f | 2765 | return; |
ad7f8a1f | 2766 | |
d308a881 LP |
2767 | txmsg = list_first_entry(&mgr->tx_msg_downq, |
2768 | struct drm_dp_sideband_msg_tx, next); | |
ad7f8a1f | 2769 | ret = process_single_tx_qlock(mgr, txmsg, false); |
d308a881 | 2770 | if (ret < 0) { |
ad7f8a1f DA |
2771 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
2772 | list_del(&txmsg->next); | |
ad7f8a1f | 2773 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
68e989dc | 2774 | wake_up_all(&mgr->tx_waitq); |
ad7f8a1f | 2775 | } |
ad7f8a1f DA |
2776 | } |
2777 | ||
ad7f8a1f DA |
2778 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
2779 | struct drm_dp_sideband_msg_tx *txmsg) | |
2780 | { | |
2781 | mutex_lock(&mgr->qlock); | |
2782 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); | |
2f015ec6 | 2783 | |
f0a8f533 | 2784 | if (drm_debug_enabled(DRM_UT_DP)) { |
2f015ec6 LP |
2785 | struct drm_printer p = drm_debug_printer(DBG_PREFIX); |
2786 | ||
2787 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); | |
2788 | } | |
2789 | ||
d308a881 | 2790 | if (list_is_singular(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
2791 | process_single_down_tx_qlock(mgr); |
2792 | mutex_unlock(&mgr->qlock); | |
2793 | } | |
2794 | ||
5950f0b7 LP |
2795 | static void |
2796 | drm_dp_dump_link_address(struct drm_dp_link_address_ack_reply *reply) | |
2797 | { | |
2798 | struct drm_dp_link_addr_reply_port *port_reply; | |
2799 | int i; | |
2800 | ||
2801 | for (i = 0; i < reply->nports; i++) { | |
2802 | port_reply = &reply->ports[i]; | |
2803 | DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", | |
2804 | i, | |
2805 | port_reply->input_port, | |
2806 | port_reply->peer_device_type, | |
2807 | port_reply->port_number, | |
2808 | port_reply->dpcd_revision, | |
2809 | port_reply->mcs, | |
2810 | port_reply->ddps, | |
2811 | port_reply->legacy_device_plug_status, | |
2812 | port_reply->num_sdp_streams, | |
2813 | port_reply->num_sdp_stream_sinks); | |
2814 | } | |
2815 | } | |
2816 | ||
6f85f738 | 2817 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
68d8c9fc | 2818 | struct drm_dp_mst_branch *mstb) |
ad7f8a1f | 2819 | { |
ad7f8a1f | 2820 | struct drm_dp_sideband_msg_tx *txmsg; |
37dfdc55 | 2821 | struct drm_dp_link_address_ack_reply *reply; |
6f85f738 | 2822 | struct drm_dp_mst_port *port, *tmp; |
cb897542 | 2823 | int i, ret, port_mask = 0; |
6f85f738 | 2824 | bool changed = false; |
ad7f8a1f DA |
2825 | |
2826 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2827 | if (!txmsg) | |
6f85f738 | 2828 | return -ENOMEM; |
ad7f8a1f DA |
2829 | |
2830 | txmsg->dst = mstb; | |
cb897542 | 2831 | build_link_address(txmsg); |
ad7f8a1f | 2832 | |
68d8c9fc | 2833 | mstb->link_address_sent = true; |
ad7f8a1f DA |
2834 | drm_dp_queue_down_tx(mgr, txmsg); |
2835 | ||
37dfdc55 | 2836 | /* FIXME: Actually do some real error handling here */ |
ad7f8a1f | 2837 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
37dfdc55 LP |
2838 | if (ret <= 0) { |
2839 | DRM_ERROR("Sending link address failed with %d\n", ret); | |
2840 | goto out; | |
2841 | } | |
2842 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { | |
2843 | DRM_ERROR("link address NAK received\n"); | |
2844 | ret = -EIO; | |
2845 | goto out; | |
2846 | } | |
ad7f8a1f | 2847 | |
37dfdc55 LP |
2848 | reply = &txmsg->reply.u.link_addr; |
2849 | DRM_DEBUG_KMS("link address reply: %d\n", reply->nports); | |
2850 | drm_dp_dump_link_address(reply); | |
5e93b820 | 2851 | |
cb897542 | 2852 | ret = drm_dp_check_mstb_guid(mstb, reply->guid); |
94b6ada4 LP |
2853 | if (ret) { |
2854 | char buf[64]; | |
2855 | ||
2856 | drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf)); | |
2857 | DRM_ERROR("GUID check on %s failed: %d\n", | |
2858 | buf, ret); | |
cb897542 | 2859 | goto out; |
94b6ada4 | 2860 | } |
5e93b820 | 2861 | |
6f85f738 LP |
2862 | for (i = 0; i < reply->nports; i++) { |
2863 | port_mask |= BIT(reply->ports[i].port_number); | |
2864 | ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev, | |
2865 | &reply->ports[i]); | |
2866 | if (ret == 1) | |
2867 | changed = true; | |
2868 | else if (ret < 0) | |
2869 | goto out; | |
2870 | } | |
37dfdc55 | 2871 | |
6f85f738 LP |
2872 | /* Prune any ports that are currently a part of mstb in our in-memory |
2873 | * topology, but were not seen in this link address. Usually this | |
2874 | * means that they were removed while the topology was out of sync, | |
2875 | * e.g. during suspend/resume | |
2876 | */ | |
2877 | mutex_lock(&mgr->lock); | |
2878 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { | |
2879 | if (port_mask & BIT(port->port_num)) | |
2880 | continue; | |
2881 | ||
2882 | DRM_DEBUG_KMS("port %d was not in link address, removing\n", | |
2883 | port->port_num); | |
2884 | list_del(&port->next); | |
2885 | drm_dp_mst_topology_put_port(port); | |
2886 | changed = true; | |
2887 | } | |
2888 | mutex_unlock(&mgr->lock); | |
ad7f8a1f | 2889 | |
37dfdc55 LP |
2890 | out: |
2891 | if (ret <= 0) | |
2892 | mstb->link_address_sent = false; | |
ad7f8a1f | 2893 | kfree(txmsg); |
6f85f738 | 2894 | return ret < 0 ? ret : changed; |
ad7f8a1f DA |
2895 | } |
2896 | ||
f7948907 SP |
2897 | void drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr, |
2898 | struct drm_dp_mst_branch *mstb) | |
2899 | { | |
2900 | struct drm_dp_sideband_msg_tx *txmsg; | |
cb897542 | 2901 | int ret; |
f7948907 SP |
2902 | |
2903 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2904 | if (!txmsg) | |
2905 | return; | |
2906 | ||
2907 | txmsg->dst = mstb; | |
cb897542 | 2908 | build_clear_payload_id_table(txmsg); |
f7948907 SP |
2909 | |
2910 | drm_dp_queue_down_tx(mgr, txmsg); | |
2911 | ||
2912 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
2913 | if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) | |
2914 | DRM_DEBUG_KMS("clear payload table id nak received\n"); | |
2915 | ||
2916 | kfree(txmsg); | |
2917 | } | |
2918 | ||
95b0013d LP |
2919 | static int |
2920 | drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, | |
2921 | struct drm_dp_mst_branch *mstb, | |
2922 | struct drm_dp_mst_port *port) | |
ad7f8a1f | 2923 | { |
95b0013d | 2924 | struct drm_dp_enum_path_resources_ack_reply *path_res; |
ad7f8a1f DA |
2925 | struct drm_dp_sideband_msg_tx *txmsg; |
2926 | int ret; | |
2927 | ||
2928 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2929 | if (!txmsg) | |
2930 | return -ENOMEM; | |
2931 | ||
2932 | txmsg->dst = mstb; | |
cb897542 | 2933 | build_enum_path_resources(txmsg, port->port_num); |
ad7f8a1f DA |
2934 | |
2935 | drm_dp_queue_down_tx(mgr, txmsg); | |
2936 | ||
2937 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
2938 | if (ret > 0) { | |
87212b51 | 2939 | ret = 0; |
95b0013d LP |
2940 | path_res = &txmsg->reply.u.path_resources; |
2941 | ||
45bbda1e | 2942 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
ad7f8a1f | 2943 | DRM_DEBUG_KMS("enum path resources nak received\n"); |
45bbda1e | 2944 | } else { |
95b0013d | 2945 | if (port->port_num != path_res->port_number) |
ad7f8a1f | 2946 | DRM_ERROR("got incorrect port in response\n"); |
95b0013d LP |
2947 | |
2948 | DRM_DEBUG_KMS("enum path resources %d: %d %d\n", | |
2949 | path_res->port_number, | |
2950 | path_res->full_payload_bw_number, | |
2951 | path_res->avail_payload_bw_number); | |
87212b51 LP |
2952 | |
2953 | /* | |
2954 | * If something changed, make sure we send a | |
2955 | * hotplug | |
2956 | */ | |
2957 | if (port->full_pbn != path_res->full_payload_bw_number || | |
2958 | port->fec_capable != path_res->fec_capable) | |
2959 | ret = 1; | |
2960 | ||
fcf46380 | 2961 | port->full_pbn = path_res->full_payload_bw_number; |
a3c2b0ff | 2962 | port->fec_capable = path_res->fec_capable; |
ad7f8a1f DA |
2963 | } |
2964 | } | |
2965 | ||
2966 | kfree(txmsg); | |
87212b51 | 2967 | return ret; |
ad7f8a1f DA |
2968 | } |
2969 | ||
91a25e46 ML |
2970 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
2971 | { | |
2972 | if (!mstb->port_parent) | |
2973 | return NULL; | |
2974 | ||
2975 | if (mstb->port_parent->mstb != mstb) | |
2976 | return mstb->port_parent; | |
2977 | ||
2978 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); | |
2979 | } | |
2980 | ||
56d1c14e LP |
2981 | /* |
2982 | * Searches upwards in the topology starting from mstb to try to find the | |
2983 | * closest available parent of mstb that's still connected to the rest of the | |
2984 | * topology. This can be used in order to perform operations like releasing | |
2985 | * payloads, where the branch device which owned the payload may no longer be | |
2986 | * around and thus would require that the payload on the last living relative | |
2987 | * be freed instead. | |
2988 | */ | |
2989 | static struct drm_dp_mst_branch * | |
2990 | drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, | |
2991 | struct drm_dp_mst_branch *mstb, | |
2992 | int *port_num) | |
91a25e46 ML |
2993 | { |
2994 | struct drm_dp_mst_branch *rmstb = NULL; | |
2995 | struct drm_dp_mst_port *found_port; | |
56d1c14e | 2996 | |
91a25e46 | 2997 | mutex_lock(&mgr->lock); |
56d1c14e LP |
2998 | if (!mgr->mst_primary) |
2999 | goto out; | |
3000 | ||
3001 | do { | |
91a25e46 | 3002 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
56d1c14e LP |
3003 | if (!found_port) |
3004 | break; | |
91a25e46 | 3005 | |
56d1c14e | 3006 | if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) { |
91a25e46 | 3007 | rmstb = found_port->parent; |
56d1c14e LP |
3008 | *port_num = found_port->port_num; |
3009 | } else { | |
3010 | /* Search again, starting from this parent */ | |
3011 | mstb = found_port->parent; | |
91a25e46 | 3012 | } |
56d1c14e LP |
3013 | } while (!rmstb); |
3014 | out: | |
91a25e46 ML |
3015 | mutex_unlock(&mgr->lock); |
3016 | return rmstb; | |
3017 | } | |
3018 | ||
8fa6a425 TR |
3019 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
3020 | struct drm_dp_mst_port *port, | |
3021 | int id, | |
3022 | int pbn) | |
ad7f8a1f DA |
3023 | { |
3024 | struct drm_dp_sideband_msg_tx *txmsg; | |
3025 | struct drm_dp_mst_branch *mstb; | |
cb897542 | 3026 | int ret, port_num; |
ef8f9bea LY |
3027 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
3028 | int i; | |
ad7f8a1f | 3029 | |
91a25e46 | 3030 | port_num = port->port_num; |
d0757afd | 3031 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
91a25e46 | 3032 | if (!mstb) { |
de6d6818 LP |
3033 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, |
3034 | port->parent, | |
3035 | &port_num); | |
91a25e46 | 3036 | |
cfe9f903 | 3037 | if (!mstb) |
91a25e46 ML |
3038 | return -EINVAL; |
3039 | } | |
ad7f8a1f DA |
3040 | |
3041 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3042 | if (!txmsg) { | |
3043 | ret = -ENOMEM; | |
3044 | goto fail_put; | |
3045 | } | |
3046 | ||
ef8f9bea LY |
3047 | for (i = 0; i < port->num_sdp_streams; i++) |
3048 | sinks[i] = i; | |
3049 | ||
ad7f8a1f | 3050 | txmsg->dst = mstb; |
cb897542 BG |
3051 | build_allocate_payload(txmsg, port_num, |
3052 | id, | |
3053 | pbn, port->num_sdp_streams, sinks); | |
ad7f8a1f DA |
3054 | |
3055 | drm_dp_queue_down_tx(mgr, txmsg); | |
3056 | ||
56d1c14e LP |
3057 | /* |
3058 | * FIXME: there is a small chance that between getting the last | |
3059 | * connected mstb and sending the payload message, the last connected | |
3060 | * mstb could also be removed from the topology. In the future, this | |
3061 | * needs to be fixed by restarting the | |
3062 | * drm_dp_get_last_connected_port_and_mstb() search in the event of a | |
3063 | * timeout if the topology is still connected to the system. | |
3064 | */ | |
ad7f8a1f DA |
3065 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
3066 | if (ret > 0) { | |
45bbda1e | 3067 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
ad7f8a1f | 3068 | ret = -EINVAL; |
de6d6818 | 3069 | else |
ad7f8a1f DA |
3070 | ret = 0; |
3071 | } | |
3072 | kfree(txmsg); | |
3073 | fail_put: | |
d0757afd | 3074 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
3075 | return ret; |
3076 | } | |
3077 | ||
0bb9c2b2 DP |
3078 | int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, |
3079 | struct drm_dp_mst_port *port, bool power_up) | |
3080 | { | |
3081 | struct drm_dp_sideband_msg_tx *txmsg; | |
cb897542 | 3082 | int ret; |
0bb9c2b2 | 3083 | |
d0757afd | 3084 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
0bb9c2b2 DP |
3085 | if (!port) |
3086 | return -EINVAL; | |
3087 | ||
3088 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3089 | if (!txmsg) { | |
d0757afd | 3090 | drm_dp_mst_topology_put_port(port); |
0bb9c2b2 DP |
3091 | return -ENOMEM; |
3092 | } | |
3093 | ||
3094 | txmsg->dst = port->parent; | |
cb897542 | 3095 | build_power_updown_phy(txmsg, port->port_num, power_up); |
0bb9c2b2 DP |
3096 | drm_dp_queue_down_tx(mgr, txmsg); |
3097 | ||
3098 | ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); | |
3099 | if (ret > 0) { | |
45bbda1e | 3100 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
0bb9c2b2 DP |
3101 | ret = -EINVAL; |
3102 | else | |
3103 | ret = 0; | |
3104 | } | |
3105 | kfree(txmsg); | |
d0757afd | 3106 | drm_dp_mst_topology_put_port(port); |
0bb9c2b2 DP |
3107 | |
3108 | return ret; | |
3109 | } | |
3110 | EXPORT_SYMBOL(drm_dp_send_power_updown_phy); | |
3111 | ||
ad7f8a1f DA |
3112 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
3113 | int id, | |
3114 | struct drm_dp_payload *payload) | |
3115 | { | |
3116 | int ret; | |
3117 | ||
3118 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); | |
3119 | if (ret < 0) { | |
3120 | payload->payload_state = 0; | |
3121 | return ret; | |
3122 | } | |
3123 | payload->payload_state = DP_PAYLOAD_LOCAL; | |
3124 | return 0; | |
3125 | } | |
3126 | ||
8fa6a425 TR |
3127 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
3128 | struct drm_dp_mst_port *port, | |
3129 | int id, | |
3130 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
3131 | { |
3132 | int ret; | |
3133 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); | |
3134 | if (ret < 0) | |
3135 | return ret; | |
3136 | payload->payload_state = DP_PAYLOAD_REMOTE; | |
3137 | return ret; | |
3138 | } | |
3139 | ||
8fa6a425 TR |
3140 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
3141 | struct drm_dp_mst_port *port, | |
3142 | int id, | |
3143 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
3144 | { |
3145 | DRM_DEBUG_KMS("\n"); | |
1e55a53a | 3146 | /* it's okay for these to fail */ |
ad7f8a1f DA |
3147 | if (port) { |
3148 | drm_dp_payload_send_msg(mgr, port, id, 0); | |
3149 | } | |
3150 | ||
3151 | drm_dp_dpcd_write_payload(mgr, id, payload); | |
dfda0df3 | 3152 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
ad7f8a1f DA |
3153 | return 0; |
3154 | } | |
3155 | ||
8fa6a425 TR |
3156 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
3157 | int id, | |
3158 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
3159 | { |
3160 | payload->payload_state = 0; | |
3161 | return 0; | |
3162 | } | |
3163 | ||
3164 | /** | |
3165 | * drm_dp_update_payload_part1() - Execute payload update part 1 | |
3166 | * @mgr: manager to use. | |
3167 | * | |
3168 | * This iterates over all proposed virtual channels, and tries to | |
3169 | * allocate space in the link for them. For 0->slots transitions, | |
3170 | * this step just writes the VCPI to the MST device. For slots->0 | |
3171 | * transitions, this writes the updated VCPIs and removes the | |
3172 | * remote VC payloads. | |
3173 | * | |
3174 | * after calling this the driver should generate ACT and payload | |
3175 | * packets. | |
3176 | */ | |
3177 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) | |
3178 | { | |
ad7f8a1f DA |
3179 | struct drm_dp_payload req_payload; |
3180 | struct drm_dp_mst_port *port; | |
cfe9f903 LP |
3181 | int i, j; |
3182 | int cur_slots = 1; | |
ad7f8a1f DA |
3183 | |
3184 | mutex_lock(&mgr->payload_lock); | |
3185 | for (i = 0; i < mgr->max_payloads; i++) { | |
706246c7 LP |
3186 | struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; |
3187 | struct drm_dp_payload *payload = &mgr->payloads[i]; | |
cfe9f903 | 3188 | bool put_port = false; |
706246c7 | 3189 | |
ad7f8a1f DA |
3190 | /* solve the current payloads - compare to the hw ones |
3191 | - update the hw view */ | |
3192 | req_payload.start_slot = cur_slots; | |
706246c7 LP |
3193 | if (vcpi) { |
3194 | port = container_of(vcpi, struct drm_dp_mst_port, | |
3195 | vcpi); | |
cfe9f903 LP |
3196 | |
3197 | /* Validated ports don't matter if we're releasing | |
3198 | * VCPI | |
3199 | */ | |
3200 | if (vcpi->num_slots) { | |
3201 | port = drm_dp_mst_topology_get_port_validated( | |
3202 | mgr, port); | |
3203 | if (!port) { | |
3204 | mutex_unlock(&mgr->payload_lock); | |
3205 | return -EINVAL; | |
3206 | } | |
3207 | put_port = true; | |
263efde3 | 3208 | } |
cfe9f903 | 3209 | |
706246c7 LP |
3210 | req_payload.num_slots = vcpi->num_slots; |
3211 | req_payload.vcpi = vcpi->vcpi; | |
ad7f8a1f DA |
3212 | } else { |
3213 | port = NULL; | |
3214 | req_payload.num_slots = 0; | |
3215 | } | |
dfda0df3 | 3216 | |
706246c7 | 3217 | payload->start_slot = req_payload.start_slot; |
ad7f8a1f | 3218 | /* work out what is required to happen with this payload */ |
706246c7 | 3219 | if (payload->num_slots != req_payload.num_slots) { |
ad7f8a1f DA |
3220 | |
3221 | /* need to push an update for this payload */ | |
3222 | if (req_payload.num_slots) { | |
706246c7 LP |
3223 | drm_dp_create_payload_step1(mgr, vcpi->vcpi, |
3224 | &req_payload); | |
3225 | payload->num_slots = req_payload.num_slots; | |
3226 | payload->vcpi = req_payload.vcpi; | |
3227 | ||
3228 | } else if (payload->num_slots) { | |
3229 | payload->num_slots = 0; | |
3230 | drm_dp_destroy_payload_step1(mgr, port, | |
3231 | payload->vcpi, | |
3232 | payload); | |
3233 | req_payload.payload_state = | |
3234 | payload->payload_state; | |
3235 | payload->start_slot = 0; | |
dfda0df3 | 3236 | } |
706246c7 | 3237 | payload->payload_state = req_payload.payload_state; |
ad7f8a1f DA |
3238 | } |
3239 | cur_slots += req_payload.num_slots; | |
263efde3 | 3240 | |
cfe9f903 | 3241 | if (put_port) |
d0757afd | 3242 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f | 3243 | } |
dfda0df3 | 3244 | |
e5a6ca27 WL |
3245 | for (i = 0; i < mgr->max_payloads; /* do nothing */) { |
3246 | if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) { | |
3247 | i++; | |
706246c7 | 3248 | continue; |
e5a6ca27 | 3249 | } |
dfda0df3 | 3250 | |
706246c7 LP |
3251 | DRM_DEBUG_KMS("removing payload %d\n", i); |
3252 | for (j = i; j < mgr->max_payloads - 1; j++) { | |
3253 | mgr->payloads[j] = mgr->payloads[j + 1]; | |
3254 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; | |
3255 | ||
3256 | if (mgr->proposed_vcpis[j] && | |
3257 | mgr->proposed_vcpis[j]->num_slots) { | |
3258 | set_bit(j + 1, &mgr->payload_mask); | |
3259 | } else { | |
3260 | clear_bit(j + 1, &mgr->payload_mask); | |
3261 | } | |
dfda0df3 | 3262 | } |
706246c7 LP |
3263 | |
3264 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, | |
3265 | sizeof(struct drm_dp_payload)); | |
3266 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; | |
3267 | clear_bit(mgr->max_payloads, &mgr->payload_mask); | |
dfda0df3 | 3268 | } |
ad7f8a1f DA |
3269 | mutex_unlock(&mgr->payload_lock); |
3270 | ||
3271 | return 0; | |
3272 | } | |
3273 | EXPORT_SYMBOL(drm_dp_update_payload_part1); | |
3274 | ||
3275 | /** | |
3276 | * drm_dp_update_payload_part2() - Execute payload update part 2 | |
3277 | * @mgr: manager to use. | |
3278 | * | |
3279 | * This iterates over all proposed virtual channels, and tries to | |
3280 | * allocate space in the link for them. For 0->slots transitions, | |
3281 | * this step writes the remote VC payload commands. For slots->0 | |
3282 | * this just resets some internal state. | |
3283 | */ | |
3284 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) | |
3285 | { | |
3286 | struct drm_dp_mst_port *port; | |
3287 | int i; | |
7389ad4b | 3288 | int ret = 0; |
ad7f8a1f DA |
3289 | mutex_lock(&mgr->payload_lock); |
3290 | for (i = 0; i < mgr->max_payloads; i++) { | |
3291 | ||
3292 | if (!mgr->proposed_vcpis[i]) | |
3293 | continue; | |
3294 | ||
3295 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
3296 | ||
3297 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); | |
3298 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { | |
dfda0df3 | 3299 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f | 3300 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
dfda0df3 | 3301 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f DA |
3302 | } |
3303 | if (ret) { | |
3304 | mutex_unlock(&mgr->payload_lock); | |
3305 | return ret; | |
3306 | } | |
3307 | } | |
3308 | mutex_unlock(&mgr->payload_lock); | |
3309 | return 0; | |
3310 | } | |
3311 | EXPORT_SYMBOL(drm_dp_update_payload_part2); | |
3312 | ||
ad7f8a1f DA |
3313 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
3314 | struct drm_dp_mst_port *port, | |
562836a2 | 3315 | int offset, int size, u8 *bytes) |
ad7f8a1f | 3316 | { |
562836a2 | 3317 | int ret = 0; |
ad7f8a1f | 3318 | struct drm_dp_sideband_msg_tx *txmsg; |
562836a2 VS |
3319 | struct drm_dp_mst_branch *mstb; |
3320 | ||
3321 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); | |
3322 | if (!mstb) | |
3323 | return -EINVAL; | |
ad7f8a1f DA |
3324 | |
3325 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
562836a2 VS |
3326 | if (!txmsg) { |
3327 | ret = -ENOMEM; | |
3328 | goto fail_put; | |
3329 | } | |
ad7f8a1f | 3330 | |
cb897542 | 3331 | build_dpcd_read(txmsg, port->port_num, offset, size); |
ad7f8a1f DA |
3332 | txmsg->dst = port->parent; |
3333 | ||
3334 | drm_dp_queue_down_tx(mgr, txmsg); | |
3335 | ||
562836a2 VS |
3336 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
3337 | if (ret < 0) | |
3338 | goto fail_free; | |
3339 | ||
3340 | /* DPCD read should never be NACKed */ | |
3341 | if (txmsg->reply.reply_type == 1) { | |
3342 | DRM_ERROR("mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n", | |
3343 | mstb, port->port_num, offset, size); | |
3344 | ret = -EIO; | |
3345 | goto fail_free; | |
3346 | } | |
3347 | ||
3348 | if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) { | |
3349 | ret = -EPROTO; | |
3350 | goto fail_free; | |
3351 | } | |
3352 | ||
3353 | ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes, | |
3354 | size); | |
3355 | memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret); | |
3356 | ||
3357 | fail_free: | |
3358 | kfree(txmsg); | |
3359 | fail_put: | |
3360 | drm_dp_mst_topology_put_mstb(mstb); | |
3361 | ||
3362 | return ret; | |
ad7f8a1f | 3363 | } |
ad7f8a1f DA |
3364 | |
3365 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
3366 | struct drm_dp_mst_port *port, | |
3367 | int offset, int size, u8 *bytes) | |
3368 | { | |
ad7f8a1f DA |
3369 | int ret; |
3370 | struct drm_dp_sideband_msg_tx *txmsg; | |
3371 | struct drm_dp_mst_branch *mstb; | |
3372 | ||
d0757afd | 3373 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
ad7f8a1f DA |
3374 | if (!mstb) |
3375 | return -EINVAL; | |
3376 | ||
3377 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3378 | if (!txmsg) { | |
3379 | ret = -ENOMEM; | |
3380 | goto fail_put; | |
3381 | } | |
3382 | ||
cb897542 | 3383 | build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
ad7f8a1f DA |
3384 | txmsg->dst = mstb; |
3385 | ||
3386 | drm_dp_queue_down_tx(mgr, txmsg); | |
3387 | ||
3388 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
dbc05ae3 LP |
3389 | if (ret > 0) { |
3390 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) | |
3391 | ret = -EIO; | |
3392 | else | |
3393 | ret = size; | |
3394 | } | |
4c0a9b62 | 3395 | |
ad7f8a1f DA |
3396 | kfree(txmsg); |
3397 | fail_put: | |
d0757afd | 3398 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
3399 | return ret; |
3400 | } | |
3401 | ||
3402 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) | |
3403 | { | |
3404 | struct drm_dp_sideband_msg_reply_body reply; | |
3405 | ||
45bbda1e | 3406 | reply.reply_type = DP_SIDEBAND_REPLY_ACK; |
ad7f8a1f DA |
3407 | reply.req_type = req_type; |
3408 | drm_dp_encode_sideband_reply(&reply, msg); | |
3409 | return 0; | |
3410 | } | |
3411 | ||
3412 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, | |
3413 | struct drm_dp_mst_branch *mstb, | |
d308a881 | 3414 | int req_type, bool broadcast) |
ad7f8a1f DA |
3415 | { |
3416 | struct drm_dp_sideband_msg_tx *txmsg; | |
3417 | ||
3418 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3419 | if (!txmsg) | |
3420 | return -ENOMEM; | |
3421 | ||
3422 | txmsg->dst = mstb; | |
ad7f8a1f DA |
3423 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
3424 | ||
3425 | mutex_lock(&mgr->qlock); | |
d308a881 LP |
3426 | /* construct a chunk from the first msg in the tx_msg queue */ |
3427 | process_single_tx_qlock(mgr, txmsg, true); | |
ad7f8a1f | 3428 | mutex_unlock(&mgr->qlock); |
1f16ee7f ML |
3429 | |
3430 | kfree(txmsg); | |
ad7f8a1f DA |
3431 | return 0; |
3432 | } | |
3433 | ||
0c3bb15c | 3434 | static int drm_dp_get_vc_payload_bw(u8 dp_link_bw, u8 dp_link_count) |
ad7f8a1f | 3435 | { |
0c3bb15c | 3436 | if (dp_link_bw == 0 || dp_link_count == 0) |
b853fdb3 CW |
3437 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", |
3438 | dp_link_bw, dp_link_count); | |
b853fdb3 | 3439 | |
0c3bb15c | 3440 | return dp_link_bw * dp_link_count / 2; |
ad7f8a1f DA |
3441 | } |
3442 | ||
3443 | /** | |
3444 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager | |
3445 | * @mgr: manager to set state for | |
3446 | * @mst_state: true to enable MST on this connector - false to disable. | |
3447 | * | |
3448 | * This is called by the driver when it detects an MST capable device plugged | |
3449 | * into a DP MST capable port, or when a DP MST capable device is unplugged. | |
3450 | */ | |
3451 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) | |
3452 | { | |
3453 | int ret = 0; | |
3454 | struct drm_dp_mst_branch *mstb = NULL; | |
3455 | ||
8732fe46 | 3456 | mutex_lock(&mgr->payload_lock); |
ad7f8a1f DA |
3457 | mutex_lock(&mgr->lock); |
3458 | if (mst_state == mgr->mst_state) | |
3459 | goto out_unlock; | |
3460 | ||
3461 | mgr->mst_state = mst_state; | |
3462 | /* set the device into MST mode */ | |
3463 | if (mst_state) { | |
7a3cbf59 JRS |
3464 | struct drm_dp_payload reset_pay; |
3465 | ||
ad7f8a1f DA |
3466 | WARN_ON(mgr->mst_primary); |
3467 | ||
3468 | /* get dpcd info */ | |
3469 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); | |
3470 | if (ret != DP_RECEIVER_CAP_SIZE) { | |
3471 | DRM_DEBUG_KMS("failed to read DPCD\n"); | |
3472 | goto out_unlock; | |
3473 | } | |
3474 | ||
0c3bb15c VS |
3475 | mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
3476 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK); | |
3477 | if (mgr->pbn_div == 0) { | |
b853fdb3 CW |
3478 | ret = -EINVAL; |
3479 | goto out_unlock; | |
3480 | } | |
3481 | ||
ad7f8a1f DA |
3482 | /* add initial branch device at LCT 1 */ |
3483 | mstb = drm_dp_add_mst_branch_device(1, NULL); | |
3484 | if (mstb == NULL) { | |
3485 | ret = -ENOMEM; | |
3486 | goto out_unlock; | |
3487 | } | |
3488 | mstb->mgr = mgr; | |
3489 | ||
3490 | /* give this the main reference */ | |
3491 | mgr->mst_primary = mstb; | |
ebcc0e6b | 3492 | drm_dp_mst_topology_get_mstb(mgr->mst_primary); |
ad7f8a1f | 3493 | |
c175cd16 | 3494 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
3ff4c24b LP |
3495 | DP_MST_EN | |
3496 | DP_UP_REQ_EN | | |
3497 | DP_UPSTREAM_IS_SRC); | |
7a3cbf59 | 3498 | if (ret < 0) |
c175cd16 | 3499 | goto out_unlock; |
c175cd16 | 3500 | |
7a3cbf59 JRS |
3501 | reset_pay.start_slot = 0; |
3502 | reset_pay.num_slots = 0x3f; | |
3503 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); | |
ad7f8a1f | 3504 | |
ad7f8a1f DA |
3505 | queue_work(system_long_wq, &mgr->work); |
3506 | ||
3507 | ret = 0; | |
3508 | } else { | |
3509 | /* disable MST on the device */ | |
3510 | mstb = mgr->mst_primary; | |
3511 | mgr->mst_primary = NULL; | |
3512 | /* this can fail if the device is gone */ | |
3513 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); | |
3514 | ret = 0; | |
8732fe46 LP |
3515 | memset(mgr->payloads, 0, |
3516 | mgr->max_payloads * sizeof(mgr->payloads[0])); | |
3517 | memset(mgr->proposed_vcpis, 0, | |
3518 | mgr->max_payloads * sizeof(mgr->proposed_vcpis[0])); | |
ad7f8a1f DA |
3519 | mgr->payload_mask = 0; |
3520 | set_bit(0, &mgr->payload_mask); | |
dfda0df3 | 3521 | mgr->vcpi_mask = 0; |
f7948907 | 3522 | mgr->payload_id_table_cleared = false; |
ad7f8a1f DA |
3523 | } |
3524 | ||
3525 | out_unlock: | |
3526 | mutex_unlock(&mgr->lock); | |
8732fe46 | 3527 | mutex_unlock(&mgr->payload_lock); |
ad7f8a1f | 3528 | if (mstb) |
d0757afd | 3529 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
3530 | return ret; |
3531 | ||
3532 | } | |
3533 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); | |
3534 | ||
6f85f738 LP |
3535 | static void |
3536 | drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) | |
3537 | { | |
3538 | struct drm_dp_mst_port *port; | |
3539 | ||
3540 | /* The link address will need to be re-sent on resume */ | |
3541 | mstb->link_address_sent = false; | |
3542 | ||
87212b51 | 3543 | list_for_each_entry(port, &mstb->ports, next) |
6f85f738 LP |
3544 | if (port->mstb) |
3545 | drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb); | |
6f85f738 LP |
3546 | } |
3547 | ||
ad7f8a1f DA |
3548 | /** |
3549 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager | |
3550 | * @mgr: manager to suspend | |
3551 | * | |
3552 | * This function tells the MST device that we can't handle UP messages | |
3553 | * anymore. This should stop it from sending any since we are suspended. | |
3554 | */ | |
3555 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) | |
3556 | { | |
3557 | mutex_lock(&mgr->lock); | |
3558 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
3559 | DP_MST_EN | DP_UPSTREAM_IS_SRC); | |
3560 | mutex_unlock(&mgr->lock); | |
9408cc94 | 3561 | flush_work(&mgr->up_req_work); |
274d8352 | 3562 | flush_work(&mgr->work); |
7cb12d48 | 3563 | flush_work(&mgr->delayed_destroy_work); |
6f85f738 LP |
3564 | |
3565 | mutex_lock(&mgr->lock); | |
3566 | if (mgr->mst_state && mgr->mst_primary) | |
3567 | drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); | |
3568 | mutex_unlock(&mgr->lock); | |
ad7f8a1f DA |
3569 | } |
3570 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); | |
3571 | ||
3572 | /** | |
3573 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager | |
3574 | * @mgr: manager to resume | |
6f85f738 | 3575 | * @sync: whether or not to perform topology reprobing synchronously |
ad7f8a1f DA |
3576 | * |
3577 | * This will fetch DPCD and see if the device is still there, | |
3578 | * if it is, it will rewrite the MSTM control bits, and return. | |
3579 | * | |
6f85f738 | 3580 | * If the device fails this returns -1, and the driver should do |
ad7f8a1f | 3581 | * a full MST reprobe, in case we were undocked. |
6f85f738 LP |
3582 | * |
3583 | * During system resume (where it is assumed that the driver will be calling | |
3584 | * drm_atomic_helper_resume()) this function should be called beforehand with | |
3585 | * @sync set to true. In contexts like runtime resume where the driver is not | |
3586 | * expected to be calling drm_atomic_helper_resume(), this function should be | |
3587 | * called with @sync set to false in order to avoid deadlocking. | |
3588 | * | |
3589 | * Returns: -1 if the MST topology was removed while we were suspended, 0 | |
3590 | * otherwise. | |
ad7f8a1f | 3591 | */ |
6f85f738 LP |
3592 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, |
3593 | bool sync) | |
ad7f8a1f | 3594 | { |
79413ed4 LP |
3595 | int ret; |
3596 | u8 guid[16]; | |
ad7f8a1f DA |
3597 | |
3598 | mutex_lock(&mgr->lock); | |
79413ed4 LP |
3599 | if (!mgr->mst_primary) |
3600 | goto out_fail; | |
ad7f8a1f | 3601 | |
79413ed4 LP |
3602 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, |
3603 | DP_RECEIVER_CAP_SIZE); | |
3604 | if (ret != DP_RECEIVER_CAP_SIZE) { | |
3605 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
3606 | goto out_fail; | |
3607 | } | |
1652fce6 | 3608 | |
79413ed4 LP |
3609 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
3610 | DP_MST_EN | | |
3611 | DP_UP_REQ_EN | | |
3612 | DP_UPSTREAM_IS_SRC); | |
3613 | if (ret < 0) { | |
3614 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); | |
3615 | goto out_fail; | |
3616 | } | |
ad7f8a1f | 3617 | |
79413ed4 LP |
3618 | /* Some hubs forget their guids after they resume */ |
3619 | ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); | |
3620 | if (ret != 16) { | |
3621 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
3622 | goto out_fail; | |
3623 | } | |
cb897542 BG |
3624 | |
3625 | ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid); | |
3626 | if (ret) { | |
3627 | DRM_DEBUG_KMS("check mstb failed - undocked during suspend?\n"); | |
3628 | goto out_fail; | |
3629 | } | |
1652fce6 | 3630 | |
6f85f738 LP |
3631 | /* |
3632 | * For the final step of resuming the topology, we need to bring the | |
3633 | * state of our in-memory topology back into sync with reality. So, | |
3634 | * restart the probing process as if we're probing a new hub | |
3635 | */ | |
3636 | queue_work(system_long_wq, &mgr->work); | |
79413ed4 | 3637 | mutex_unlock(&mgr->lock); |
1652fce6 | 3638 | |
6f85f738 LP |
3639 | if (sync) { |
3640 | DRM_DEBUG_KMS("Waiting for link probe work to finish re-syncing topology...\n"); | |
3641 | flush_work(&mgr->work); | |
3642 | } | |
ad7f8a1f | 3643 | |
79413ed4 | 3644 | return 0; |
ad7f8a1f | 3645 | |
79413ed4 | 3646 | out_fail: |
ad7f8a1f | 3647 | mutex_unlock(&mgr->lock); |
79413ed4 | 3648 | return -1; |
ad7f8a1f DA |
3649 | } |
3650 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); | |
3651 | ||
d308a881 LP |
3652 | static bool |
3653 | drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up, | |
3654 | struct drm_dp_mst_branch **mstb) | |
ad7f8a1f DA |
3655 | { |
3656 | int len; | |
3657 | u8 replyblock[32]; | |
b37ea8bf | 3658 | int replylen, curreply; |
ad7f8a1f | 3659 | int ret; |
21a729d0 SP |
3660 | u8 hdrlen; |
3661 | struct drm_dp_sideband_msg_hdr hdr; | |
d308a881 LP |
3662 | struct drm_dp_sideband_msg_rx *msg = |
3663 | up ? &mgr->up_req_recv : &mgr->down_rep_recv; | |
21a729d0 SP |
3664 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : |
3665 | DP_SIDEBAND_MSG_DOWN_REP_BASE; | |
3666 | ||
cbfb1b74 LP |
3667 | if (!up) |
3668 | *mstb = NULL; | |
ad7f8a1f DA |
3669 | |
3670 | len = min(mgr->max_dpcd_transaction_bytes, 16); | |
21a729d0 | 3671 | ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len); |
ad7f8a1f DA |
3672 | if (ret != len) { |
3673 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); | |
636c4c3e | 3674 | return false; |
ad7f8a1f | 3675 | } |
21a729d0 SP |
3676 | |
3677 | ret = drm_dp_decode_sideband_msg_hdr(&hdr, replyblock, len, &hdrlen); | |
3678 | if (ret == false) { | |
3679 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, | |
3680 | 1, replyblock, len, false); | |
3681 | DRM_DEBUG_KMS("ERROR: failed header\n"); | |
3682 | return false; | |
3683 | } | |
3684 | ||
d308a881 | 3685 | if (!up) { |
fbc821c4 SP |
3686 | /* Caller is responsible for giving back this reference */ |
3687 | *mstb = drm_dp_get_mst_branch_device(mgr, hdr.lct, hdr.rad); | |
3688 | if (!*mstb) { | |
3689 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", | |
3690 | hdr.lct); | |
3691 | return false; | |
3692 | } | |
fbc821c4 SP |
3693 | } |
3694 | ||
21a729d0 SP |
3695 | if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) { |
3696 | DRM_DEBUG_KMS("sideband msg set header failed %d\n", | |
3697 | replyblock[0]); | |
3698 | return false; | |
3699 | } | |
3700 | ||
3701 | replylen = min(msg->curchunk_len, (u8)(len - hdrlen)); | |
3702 | ret = drm_dp_sideband_append_payload(msg, replyblock + hdrlen, replylen); | |
ad7f8a1f DA |
3703 | if (!ret) { |
3704 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); | |
636c4c3e | 3705 | return false; |
ad7f8a1f | 3706 | } |
ad7f8a1f | 3707 | |
21a729d0 | 3708 | replylen = msg->curchunk_len + msg->curchunk_hdrlen - len; |
ad7f8a1f DA |
3709 | curreply = len; |
3710 | while (replylen > 0) { | |
3711 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); | |
3712 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, | |
3713 | replyblock, len); | |
3714 | if (ret != len) { | |
448421b5 ID |
3715 | DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", |
3716 | len, ret); | |
636c4c3e | 3717 | return false; |
ad7f8a1f | 3718 | } |
448421b5 | 3719 | |
21a729d0 | 3720 | ret = drm_dp_sideband_append_payload(msg, replyblock, len); |
448421b5 | 3721 | if (!ret) { |
ad7f8a1f | 3722 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
636c4c3e | 3723 | return false; |
448421b5 ID |
3724 | } |
3725 | ||
ad7f8a1f DA |
3726 | curreply += len; |
3727 | replylen -= len; | |
3728 | } | |
636c4c3e | 3729 | return true; |
ad7f8a1f DA |
3730 | } |
3731 | ||
3732 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) | |
3733 | { | |
8b1e589d | 3734 | struct drm_dp_sideband_msg_tx *txmsg; |
fbc821c4 | 3735 | struct drm_dp_mst_branch *mstb = NULL; |
d308a881 | 3736 | struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv; |
ad7f8a1f | 3737 | |
d308a881 LP |
3738 | if (!drm_dp_get_one_sb_msg(mgr, false, &mstb)) |
3739 | goto out; | |
8b1e589d | 3740 | |
fbc821c4 SP |
3741 | /* Multi-packet message transmission, don't clear the reply */ |
3742 | if (!msg->have_eomt) | |
3743 | goto out; | |
ad7f8a1f | 3744 | |
8b1e589d | 3745 | /* find the message */ |
8b1e589d | 3746 | mutex_lock(&mgr->qlock); |
d308a881 LP |
3747 | txmsg = list_first_entry_or_null(&mgr->tx_msg_downq, |
3748 | struct drm_dp_sideband_msg_tx, next); | |
8b1e589d | 3749 | mutex_unlock(&mgr->qlock); |
ad7f8a1f | 3750 | |
d308a881 LP |
3751 | /* Were we actually expecting a response, and from this mstb? */ |
3752 | if (!txmsg || txmsg->dst != mstb) { | |
fbc821c4 SP |
3753 | struct drm_dp_sideband_msg_hdr *hdr; |
3754 | hdr = &msg->initial_hdr; | |
8b1e589d LP |
3755 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", |
3756 | mstb, hdr->seqno, hdr->lct, hdr->rad[0], | |
fbc821c4 SP |
3757 | msg->msg[0]); |
3758 | goto out_clear_reply; | |
8b1e589d | 3759 | } |
ad7f8a1f | 3760 | |
fbc821c4 | 3761 | drm_dp_sideband_parse_reply(msg, &txmsg->reply); |
ad7f8a1f | 3762 | |
fbc821c4 | 3763 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
8b1e589d LP |
3764 | DRM_DEBUG_KMS("Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n", |
3765 | txmsg->reply.req_type, | |
3766 | drm_dp_mst_req_type_str(txmsg->reply.req_type), | |
3767 | txmsg->reply.u.nak.reason, | |
3768 | drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason), | |
3769 | txmsg->reply.u.nak.nak_data); | |
fbc821c4 | 3770 | } |
45bbda1e | 3771 | |
fbc821c4 | 3772 | memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
8b1e589d | 3773 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f | 3774 | |
8b1e589d LP |
3775 | mutex_lock(&mgr->qlock); |
3776 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; | |
d308a881 | 3777 | list_del(&txmsg->next); |
8b1e589d | 3778 | mutex_unlock(&mgr->qlock); |
ad7f8a1f | 3779 | |
8b1e589d LP |
3780 | wake_up_all(&mgr->tx_waitq); |
3781 | ||
3782 | return 0; | |
3783 | ||
fbc821c4 | 3784 | out_clear_reply: |
d308a881 | 3785 | memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
fbc821c4 SP |
3786 | out: |
3787 | if (mstb) | |
3788 | drm_dp_mst_topology_put_mstb(mstb); | |
8b1e589d LP |
3789 | |
3790 | return 0; | |
ad7f8a1f DA |
3791 | } |
3792 | ||
3f9b3f02 | 3793 | static inline bool |
9408cc94 LP |
3794 | drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, |
3795 | struct drm_dp_pending_up_req *up_req) | |
3796 | { | |
3797 | struct drm_dp_mst_branch *mstb = NULL; | |
3798 | struct drm_dp_sideband_msg_req_body *msg = &up_req->msg; | |
3799 | struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr; | |
3f9b3f02 | 3800 | bool hotplug = false; |
9408cc94 LP |
3801 | |
3802 | if (hdr->broadcast) { | |
3803 | const u8 *guid = NULL; | |
3804 | ||
3805 | if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) | |
3806 | guid = msg->u.conn_stat.guid; | |
3807 | else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY) | |
3808 | guid = msg->u.resource_stat.guid; | |
3809 | ||
8ccb5bf7 JRS |
3810 | if (guid) |
3811 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid); | |
9408cc94 LP |
3812 | } else { |
3813 | mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad); | |
3814 | } | |
3815 | ||
3816 | if (!mstb) { | |
3817 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", | |
3818 | hdr->lct); | |
3f9b3f02 | 3819 | return false; |
9408cc94 LP |
3820 | } |
3821 | ||
3822 | /* TODO: Add missing handler for DP_RESOURCE_STATUS_NOTIFY events */ | |
3823 | if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) { | |
3824 | drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat); | |
3f9b3f02 | 3825 | hotplug = true; |
9408cc94 LP |
3826 | } |
3827 | ||
3828 | drm_dp_mst_topology_put_mstb(mstb); | |
3f9b3f02 | 3829 | return hotplug; |
9408cc94 LP |
3830 | } |
3831 | ||
3832 | static void drm_dp_mst_up_req_work(struct work_struct *work) | |
3833 | { | |
3834 | struct drm_dp_mst_topology_mgr *mgr = | |
3835 | container_of(work, struct drm_dp_mst_topology_mgr, | |
3836 | up_req_work); | |
3837 | struct drm_dp_pending_up_req *up_req; | |
3f9b3f02 | 3838 | bool send_hotplug = false; |
9408cc94 | 3839 | |
14692a36 | 3840 | mutex_lock(&mgr->probe_lock); |
9408cc94 LP |
3841 | while (true) { |
3842 | mutex_lock(&mgr->up_req_lock); | |
3843 | up_req = list_first_entry_or_null(&mgr->up_req_list, | |
3844 | struct drm_dp_pending_up_req, | |
3845 | next); | |
3846 | if (up_req) | |
3847 | list_del(&up_req->next); | |
3848 | mutex_unlock(&mgr->up_req_lock); | |
3849 | ||
3850 | if (!up_req) | |
3851 | break; | |
3852 | ||
3f9b3f02 | 3853 | send_hotplug |= drm_dp_mst_process_up_req(mgr, up_req); |
9408cc94 LP |
3854 | kfree(up_req); |
3855 | } | |
14692a36 | 3856 | mutex_unlock(&mgr->probe_lock); |
3f9b3f02 LP |
3857 | |
3858 | if (send_hotplug) | |
3859 | drm_kms_helper_hotplug_event(mgr->dev); | |
9408cc94 LP |
3860 | } |
3861 | ||
ad7f8a1f DA |
3862 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
3863 | { | |
9408cc94 | 3864 | struct drm_dp_pending_up_req *up_req; |
636c4c3e | 3865 | |
d308a881 | 3866 | if (!drm_dp_get_one_sb_msg(mgr, true, NULL)) |
a29d8818 | 3867 | goto out; |
ad7f8a1f | 3868 | |
60f9ae9d LP |
3869 | if (!mgr->up_req_recv.have_eomt) |
3870 | return 0; | |
bd934320 | 3871 | |
9408cc94 LP |
3872 | up_req = kzalloc(sizeof(*up_req), GFP_KERNEL); |
3873 | if (!up_req) { | |
3874 | DRM_ERROR("Not enough memory to process MST up req\n"); | |
3875 | return -ENOMEM; | |
60f9ae9d | 3876 | } |
9408cc94 | 3877 | INIT_LIST_HEAD(&up_req->next); |
ad7f8a1f | 3878 | |
9408cc94 | 3879 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg); |
bd934320 | 3880 | |
9408cc94 LP |
3881 | if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY && |
3882 | up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) { | |
3883 | DRM_DEBUG_KMS("Received unknown up req type, ignoring: %x\n", | |
3884 | up_req->msg.req_type); | |
3885 | kfree(up_req); | |
a29d8818 | 3886 | goto out; |
a29d8818 | 3887 | } |
5e93b820 | 3888 | |
9408cc94 | 3889 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type, |
d308a881 | 3890 | false); |
9408cc94 LP |
3891 | |
3892 | if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { | |
3893 | const struct drm_dp_connection_status_notify *conn_stat = | |
3894 | &up_req->msg.u.conn_stat; | |
8ae22cb4 | 3895 | |
a29d8818 | 3896 | DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", |
9408cc94 LP |
3897 | conn_stat->port_number, |
3898 | conn_stat->legacy_device_plug_status, | |
3899 | conn_stat->displayport_device_plug_status, | |
3900 | conn_stat->message_capability_status, | |
3901 | conn_stat->input_port, | |
3902 | conn_stat->peer_device_type); | |
3903 | } else if (up_req->msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { | |
3904 | const struct drm_dp_resource_status_notify *res_stat = | |
3905 | &up_req->msg.u.resource_stat; | |
bd934320 | 3906 | |
a29d8818 | 3907 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", |
9408cc94 LP |
3908 | res_stat->port_number, |
3909 | res_stat->available_pbn); | |
ad7f8a1f | 3910 | } |
60f9ae9d | 3911 | |
fbc821c4 | 3912 | up_req->hdr = mgr->up_req_recv.initial_hdr; |
9408cc94 LP |
3913 | mutex_lock(&mgr->up_req_lock); |
3914 | list_add_tail(&up_req->next, &mgr->up_req_list); | |
3915 | mutex_unlock(&mgr->up_req_lock); | |
3916 | queue_work(system_long_wq, &mgr->up_req_work); | |
3917 | ||
a29d8818 | 3918 | out: |
60f9ae9d | 3919 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
60f9ae9d | 3920 | return 0; |
ad7f8a1f DA |
3921 | } |
3922 | ||
3923 | /** | |
3924 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify | |
3925 | * @mgr: manager to notify irq for. | |
3926 | * @esi: 4 bytes from SINK_COUNT_ESI | |
295ee853 | 3927 | * @handled: whether the hpd interrupt was consumed or not |
ad7f8a1f DA |
3928 | * |
3929 | * This should be called from the driver when it detects a short IRQ, | |
3930 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The | |
3931 | * topology manager will process the sideband messages received as a result | |
3932 | * of this. | |
3933 | */ | |
3934 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) | |
3935 | { | |
3936 | int ret = 0; | |
3937 | int sc; | |
3938 | *handled = false; | |
3939 | sc = esi[0] & 0x3f; | |
3940 | ||
3941 | if (sc != mgr->sink_count) { | |
3942 | mgr->sink_count = sc; | |
3943 | *handled = true; | |
3944 | } | |
3945 | ||
3946 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { | |
3947 | ret = drm_dp_mst_handle_down_rep(mgr); | |
3948 | *handled = true; | |
3949 | } | |
3950 | ||
3951 | if (esi[1] & DP_UP_REQ_MSG_RDY) { | |
3952 | ret |= drm_dp_mst_handle_up_req(mgr); | |
3953 | *handled = true; | |
3954 | } | |
3955 | ||
3956 | drm_dp_mst_kick_tx(mgr); | |
3957 | return ret; | |
3958 | } | |
3959 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); | |
3960 | ||
3961 | /** | |
3962 | * drm_dp_mst_detect_port() - get connection status for an MST port | |
132d49d7 | 3963 | * @connector: DRM connector for this port |
3f9b3f02 | 3964 | * @ctx: The acquisition context to use for grabbing locks |
ad7f8a1f | 3965 | * @mgr: manager for this port |
3f9b3f02 | 3966 | * @port: pointer to a port |
ad7f8a1f | 3967 | * |
3f9b3f02 | 3968 | * This returns the current connection state for a port. |
ad7f8a1f | 3969 | */ |
3f9b3f02 LP |
3970 | int |
3971 | drm_dp_mst_detect_port(struct drm_connector *connector, | |
3972 | struct drm_modeset_acquire_ctx *ctx, | |
3973 | struct drm_dp_mst_topology_mgr *mgr, | |
3974 | struct drm_dp_mst_port *port) | |
ad7f8a1f | 3975 | { |
3f9b3f02 | 3976 | int ret; |
ad7f8a1f | 3977 | |
1e55a53a | 3978 | /* we need to search for the port in the mgr in case it's gone */ |
d0757afd | 3979 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
3980 | if (!port) |
3981 | return connector_status_disconnected; | |
3982 | ||
3f9b3f02 LP |
3983 | ret = drm_modeset_lock(&mgr->base.lock, ctx); |
3984 | if (ret) | |
3985 | goto out; | |
3986 | ||
3987 | ret = connector_status_disconnected; | |
3988 | ||
ad7f8a1f DA |
3989 | if (!port->ddps) |
3990 | goto out; | |
3991 | ||
3992 | switch (port->pdt) { | |
3993 | case DP_PEER_DEVICE_NONE: | |
3994 | case DP_PEER_DEVICE_MST_BRANCHING: | |
db1a0795 WL |
3995 | if (!port->mcs) |
3996 | ret = connector_status_connected; | |
ad7f8a1f DA |
3997 | break; |
3998 | ||
3999 | case DP_PEER_DEVICE_SST_SINK: | |
3f9b3f02 | 4000 | ret = connector_status_connected; |
8ae22cb4 DA |
4001 | /* for logical ports - cache the EDID */ |
4002 | if (port->port_num >= 8 && !port->cached_edid) { | |
4003 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); | |
4004 | } | |
ad7f8a1f DA |
4005 | break; |
4006 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
4007 | if (port->ldps) | |
3f9b3f02 | 4008 | ret = connector_status_connected; |
ad7f8a1f DA |
4009 | break; |
4010 | } | |
4011 | out: | |
d0757afd | 4012 | drm_dp_mst_topology_put_port(port); |
3f9b3f02 | 4013 | return ret; |
ad7f8a1f DA |
4014 | } |
4015 | EXPORT_SYMBOL(drm_dp_mst_detect_port); | |
4016 | ||
4017 | /** | |
4018 | * drm_dp_mst_get_edid() - get EDID for an MST port | |
4019 | * @connector: toplevel connector to get EDID for | |
4020 | * @mgr: manager for this port | |
4021 | * @port: unverified pointer to a port. | |
4022 | * | |
4023 | * This returns an EDID for the port connected to a connector, | |
4024 | * It validates the pointer still exists so the caller doesn't require a | |
4025 | * reference. | |
4026 | */ | |
4027 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
4028 | { | |
4029 | struct edid *edid = NULL; | |
4030 | ||
1e55a53a | 4031 | /* we need to search for the port in the mgr in case it's gone */ |
d0757afd | 4032 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
4033 | if (!port) |
4034 | return NULL; | |
4035 | ||
c6a0aed4 DA |
4036 | if (port->cached_edid) |
4037 | edid = drm_edid_duplicate(port->cached_edid); | |
8ae22cb4 DA |
4038 | else { |
4039 | edid = drm_get_edid(connector, &port->aux.ddc); | |
8ae22cb4 | 4040 | } |
ef8f9bea | 4041 | port->has_audio = drm_detect_monitor_audio(edid); |
d0757afd | 4042 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
4043 | return edid; |
4044 | } | |
4045 | EXPORT_SYMBOL(drm_dp_mst_get_edid); | |
4046 | ||
4047 | /** | |
e4b0c868 | 4048 | * drm_dp_find_vcpi_slots() - Find VCPI slots for this PBN value |
ad7f8a1f DA |
4049 | * @mgr: manager to use |
4050 | * @pbn: payload bandwidth to convert into slots. | |
e4b0c868 LP |
4051 | * |
4052 | * Calculate the number of VCPI slots that will be required for the given PBN | |
4053 | * value. This function is deprecated, and should not be used in atomic | |
4054 | * drivers. | |
4055 | * | |
4056 | * RETURNS: | |
4057 | * The total slots required for this port, or error. | |
ad7f8a1f DA |
4058 | */ |
4059 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, | |
4060 | int pbn) | |
4061 | { | |
4062 | int num_slots; | |
4063 | ||
4064 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
4065 | ||
feb2c3bc PD |
4066 | /* max. time slots - one slot for MTP header */ |
4067 | if (num_slots > 63) | |
ad7f8a1f DA |
4068 | return -ENOSPC; |
4069 | return num_slots; | |
4070 | } | |
4071 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); | |
4072 | ||
4073 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, | |
1e797f55 | 4074 | struct drm_dp_vcpi *vcpi, int pbn, int slots) |
ad7f8a1f | 4075 | { |
ad7f8a1f DA |
4076 | int ret; |
4077 | ||
feb2c3bc | 4078 | /* max. time slots - one slot for MTP header */ |
1e797f55 | 4079 | if (slots > 63) |
ad7f8a1f DA |
4080 | return -ENOSPC; |
4081 | ||
4082 | vcpi->pbn = pbn; | |
1e797f55 PD |
4083 | vcpi->aligned_pbn = slots * mgr->pbn_div; |
4084 | vcpi->num_slots = slots; | |
ad7f8a1f DA |
4085 | |
4086 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); | |
4087 | if (ret < 0) | |
4088 | return ret; | |
4089 | return 0; | |
4090 | } | |
4091 | ||
edb1ed1a | 4092 | /** |
eceae147 | 4093 | * drm_dp_atomic_find_vcpi_slots() - Find and add VCPI slots to the state |
edb1ed1a PD |
4094 | * @state: global atomic state |
4095 | * @mgr: MST topology manager for the port | |
4096 | * @port: port to find vcpi slots for | |
4097 | * @pbn: bandwidth required for the mode in PBN | |
1c6c1cb5 | 4098 | * @pbn_div: divider for DSC mode that takes FEC into account |
edb1ed1a | 4099 | * |
eceae147 LP |
4100 | * Allocates VCPI slots to @port, replacing any previous VCPI allocations it |
4101 | * may have had. Any atomic drivers which support MST must call this function | |
4102 | * in their &drm_encoder_helper_funcs.atomic_check() callback to change the | |
4103 | * current VCPI allocation for the new state, but only when | |
4104 | * &drm_crtc_state.mode_changed or &drm_crtc_state.connectors_changed is set | |
4105 | * to ensure compatibility with userspace applications that still use the | |
4106 | * legacy modesetting UAPI. | |
4107 | * | |
4108 | * Allocations set by this function are not checked against the bandwidth | |
4109 | * restraints of @mgr until the driver calls drm_dp_mst_atomic_check(). | |
4110 | * | |
4111 | * Additionally, it is OK to call this function multiple times on the same | |
4112 | * @port as needed. It is not OK however, to call this function and | |
4113 | * drm_dp_atomic_release_vcpi_slots() in the same atomic check phase. | |
4114 | * | |
4115 | * See also: | |
4116 | * drm_dp_atomic_release_vcpi_slots() | |
4117 | * drm_dp_mst_atomic_check() | |
4118 | * | |
4119 | * Returns: | |
4120 | * Total slots in the atomic state assigned for this port, or a negative error | |
4121 | * code if the port no longer exists | |
edb1ed1a PD |
4122 | */ |
4123 | int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, | |
4124 | struct drm_dp_mst_topology_mgr *mgr, | |
1c6c1cb5 ML |
4125 | struct drm_dp_mst_port *port, int pbn, |
4126 | int pbn_div) | |
edb1ed1a PD |
4127 | { |
4128 | struct drm_dp_mst_topology_state *topology_state; | |
eceae147 | 4129 | struct drm_dp_vcpi_allocation *pos, *vcpi = NULL; |
cd82d82c | 4130 | int prev_slots, prev_bw, req_slots; |
edb1ed1a PD |
4131 | |
4132 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); | |
56a91c49 VS |
4133 | if (IS_ERR(topology_state)) |
4134 | return PTR_ERR(topology_state); | |
edb1ed1a | 4135 | |
eceae147 LP |
4136 | /* Find the current allocation for this port, if any */ |
4137 | list_for_each_entry(pos, &topology_state->vcpis, next) { | |
4138 | if (pos->port == port) { | |
4139 | vcpi = pos; | |
4140 | prev_slots = vcpi->vcpi; | |
cd82d82c | 4141 | prev_bw = vcpi->pbn; |
eceae147 LP |
4142 | |
4143 | /* | |
4144 | * This should never happen, unless the driver tries | |
4145 | * releasing and allocating the same VCPI allocation, | |
4146 | * which is an error | |
4147 | */ | |
4148 | if (WARN_ON(!prev_slots)) { | |
4149 | DRM_ERROR("cannot allocate and release VCPI on [MST PORT:%p] in the same state\n", | |
4150 | port); | |
4151 | return -EINVAL; | |
4152 | } | |
4153 | ||
4154 | break; | |
4155 | } | |
edb1ed1a | 4156 | } |
cd82d82c | 4157 | if (!vcpi) { |
eceae147 | 4158 | prev_slots = 0; |
cd82d82c ML |
4159 | prev_bw = 0; |
4160 | } | |
eceae147 | 4161 | |
1c6c1cb5 ML |
4162 | if (pbn_div <= 0) |
4163 | pbn_div = mgr->pbn_div; | |
eceae147 | 4164 | |
1c6c1cb5 | 4165 | req_slots = DIV_ROUND_UP(pbn, pbn_div); |
eceae147 LP |
4166 | |
4167 | DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n", | |
4168 | port->connector->base.id, port->connector->name, | |
4169 | port, prev_slots, req_slots); | |
cd82d82c ML |
4170 | DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n", |
4171 | port->connector->base.id, port->connector->name, | |
4172 | port, prev_bw, pbn); | |
eceae147 LP |
4173 | |
4174 | /* Add the new allocation to the state */ | |
4175 | if (!vcpi) { | |
4176 | vcpi = kzalloc(sizeof(*vcpi), GFP_KERNEL); | |
a3d15c4b LP |
4177 | if (!vcpi) |
4178 | return -ENOMEM; | |
edb1ed1a | 4179 | |
eceae147 LP |
4180 | drm_dp_mst_get_port_malloc(port); |
4181 | vcpi->port = port; | |
4182 | list_add(&vcpi->next, &topology_state->vcpis); | |
4183 | } | |
4184 | vcpi->vcpi = req_slots; | |
cd82d82c | 4185 | vcpi->pbn = pbn; |
edb1ed1a | 4186 | |
ddd9b54d | 4187 | return req_slots; |
edb1ed1a PD |
4188 | } |
4189 | EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots); | |
4190 | ||
4191 | /** | |
4192 | * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots | |
4193 | * @state: global atomic state | |
4194 | * @mgr: MST topology manager for the port | |
eceae147 | 4195 | * @port: The port to release the VCPI slots from |
edb1ed1a | 4196 | * |
eceae147 LP |
4197 | * Releases any VCPI slots that have been allocated to a port in the atomic |
4198 | * state. Any atomic drivers which support MST must call this function in | |
4199 | * their &drm_connector_helper_funcs.atomic_check() callback when the | |
1e55a53a | 4200 | * connector will no longer have VCPI allocated (e.g. because its CRTC was |
eceae147 LP |
4201 | * removed) when it had VCPI allocated in the previous atomic state. |
4202 | * | |
4203 | * It is OK to call this even if @port has been removed from the system. | |
4204 | * Additionally, it is OK to call this function multiple times on the same | |
4205 | * @port as needed. It is not OK however, to call this function and | |
4206 | * drm_dp_atomic_find_vcpi_slots() on the same @port in a single atomic check | |
4207 | * phase. | |
4208 | * | |
4209 | * See also: | |
4210 | * drm_dp_atomic_find_vcpi_slots() | |
4211 | * drm_dp_mst_atomic_check() | |
4212 | * | |
4213 | * Returns: | |
4214 | * 0 if all slots for this port were added back to | |
4215 | * &drm_dp_mst_topology_state.avail_slots or negative error code | |
edb1ed1a PD |
4216 | */ |
4217 | int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, | |
4218 | struct drm_dp_mst_topology_mgr *mgr, | |
eceae147 | 4219 | struct drm_dp_mst_port *port) |
edb1ed1a PD |
4220 | { |
4221 | struct drm_dp_mst_topology_state *topology_state; | |
eceae147 LP |
4222 | struct drm_dp_vcpi_allocation *pos; |
4223 | bool found = false; | |
edb1ed1a PD |
4224 | |
4225 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); | |
56a91c49 VS |
4226 | if (IS_ERR(topology_state)) |
4227 | return PTR_ERR(topology_state); | |
edb1ed1a | 4228 | |
eceae147 LP |
4229 | list_for_each_entry(pos, &topology_state->vcpis, next) { |
4230 | if (pos->port == port) { | |
4231 | found = true; | |
4232 | break; | |
4233 | } | |
4234 | } | |
4235 | if (WARN_ON(!found)) { | |
4236 | DRM_ERROR("no VCPI for [MST PORT:%p] found in mst state %p\n", | |
4237 | port, &topology_state->base); | |
4238 | return -EINVAL; | |
4239 | } | |
4240 | ||
4241 | DRM_DEBUG_ATOMIC("[MST PORT:%p] VCPI %d -> 0\n", port, pos->vcpi); | |
4242 | if (pos->vcpi) { | |
4243 | drm_dp_mst_put_port_malloc(port); | |
4244 | pos->vcpi = 0; | |
7bfc1fec | 4245 | pos->pbn = 0; |
eceae147 | 4246 | } |
edb1ed1a PD |
4247 | |
4248 | return 0; | |
4249 | } | |
4250 | EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots); | |
4251 | ||
ad7f8a1f DA |
4252 | /** |
4253 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel | |
4254 | * @mgr: manager for this port | |
4255 | * @port: port to allocate a virtual channel for. | |
4256 | * @pbn: payload bandwidth number to request | |
4257 | * @slots: returned number of slots for this PBN. | |
4258 | */ | |
1e797f55 PD |
4259 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
4260 | struct drm_dp_mst_port *port, int pbn, int slots) | |
ad7f8a1f DA |
4261 | { |
4262 | int ret; | |
4263 | ||
d0757afd | 4264 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
4265 | if (!port) |
4266 | return false; | |
4267 | ||
1e797f55 PD |
4268 | if (slots < 0) |
4269 | return false; | |
4270 | ||
ad7f8a1f | 4271 | if (port->vcpi.vcpi > 0) { |
e0ac7113 LP |
4272 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", |
4273 | port->vcpi.vcpi, port->vcpi.pbn, pbn); | |
ad7f8a1f | 4274 | if (pbn == port->vcpi.pbn) { |
d0757afd | 4275 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
4276 | return true; |
4277 | } | |
4278 | } | |
4279 | ||
1e797f55 | 4280 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots); |
ad7f8a1f | 4281 | if (ret) { |
feb2c3bc | 4282 | DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n", |
e0ac7113 | 4283 | DIV_ROUND_UP(pbn, mgr->pbn_div), ret); |
ad7f8a1f DA |
4284 | goto out; |
4285 | } | |
feb2c3bc | 4286 | DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n", |
e0ac7113 | 4287 | pbn, port->vcpi.num_slots); |
ad7f8a1f | 4288 | |
1e55a53a | 4289 | /* Keep port allocated until its payload has been removed */ |
cfe9f903 | 4290 | drm_dp_mst_get_port_malloc(port); |
d0757afd | 4291 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
4292 | return true; |
4293 | out: | |
4294 | return false; | |
4295 | } | |
4296 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); | |
4297 | ||
87f5942d DA |
4298 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
4299 | { | |
4300 | int slots = 0; | |
d0757afd | 4301 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
87f5942d DA |
4302 | if (!port) |
4303 | return slots; | |
4304 | ||
4305 | slots = port->vcpi.num_slots; | |
d0757afd | 4306 | drm_dp_mst_topology_put_port(port); |
87f5942d DA |
4307 | return slots; |
4308 | } | |
4309 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); | |
4310 | ||
ad7f8a1f DA |
4311 | /** |
4312 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI | |
4313 | * @mgr: manager for this port | |
4314 | * @port: unverified pointer to a port. | |
4315 | * | |
4316 | * This just resets the number of slots for the ports VCPI for later programming. | |
4317 | */ | |
4318 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
4319 | { | |
cfe9f903 | 4320 | /* |
1e55a53a | 4321 | * A port with VCPI will remain allocated until its VCPI is |
cfe9f903 LP |
4322 | * released, no verified ref needed |
4323 | */ | |
4324 | ||
ad7f8a1f | 4325 | port->vcpi.num_slots = 0; |
ad7f8a1f DA |
4326 | } |
4327 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); | |
4328 | ||
4329 | /** | |
4330 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI | |
4331 | * @mgr: manager for this port | |
3a8844c2 LP |
4332 | * @port: port to deallocate vcpi for |
4333 | * | |
4334 | * This can be called unconditionally, regardless of whether | |
4335 | * drm_dp_mst_allocate_vcpi() succeeded or not. | |
ad7f8a1f | 4336 | */ |
4afb8a26 LP |
4337 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
4338 | struct drm_dp_mst_port *port) | |
ad7f8a1f | 4339 | { |
3a8844c2 LP |
4340 | if (!port->vcpi.vcpi) |
4341 | return; | |
ad7f8a1f DA |
4342 | |
4343 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
4344 | port->vcpi.num_slots = 0; | |
4345 | port->vcpi.pbn = 0; | |
4346 | port->vcpi.aligned_pbn = 0; | |
4347 | port->vcpi.vcpi = 0; | |
cfe9f903 | 4348 | drm_dp_mst_put_port_malloc(port); |
ad7f8a1f DA |
4349 | } |
4350 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); | |
4351 | ||
4352 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
4353 | int id, struct drm_dp_payload *payload) | |
4354 | { | |
4355 | u8 payload_alloc[3], status; | |
4356 | int ret; | |
4357 | int retries = 0; | |
4358 | ||
4359 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, | |
4360 | DP_PAYLOAD_TABLE_UPDATED); | |
4361 | ||
4362 | payload_alloc[0] = id; | |
4363 | payload_alloc[1] = payload->start_slot; | |
4364 | payload_alloc[2] = payload->num_slots; | |
4365 | ||
4366 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); | |
4367 | if (ret != 3) { | |
4368 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); | |
4369 | goto fail; | |
4370 | } | |
4371 | ||
4372 | retry: | |
4373 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
4374 | if (ret < 0) { | |
4375 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
4376 | goto fail; | |
4377 | } | |
4378 | ||
4379 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { | |
4380 | retries++; | |
4381 | if (retries < 20) { | |
4382 | usleep_range(10000, 20000); | |
4383 | goto retry; | |
4384 | } | |
4385 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); | |
4386 | ret = -EINVAL; | |
4387 | goto fail; | |
4388 | } | |
4389 | ret = 0; | |
4390 | fail: | |
4391 | return ret; | |
4392 | } | |
4393 | ||
873a95e0 LP |
4394 | static int do_get_act_status(struct drm_dp_aux *aux) |
4395 | { | |
4396 | int ret; | |
4397 | u8 status; | |
4398 | ||
4399 | ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
4400 | if (ret < 0) | |
4401 | return ret; | |
4402 | ||
4403 | return status; | |
4404 | } | |
ad7f8a1f DA |
4405 | |
4406 | /** | |
17e03aa8 | 4407 | * drm_dp_check_act_status() - Polls for ACT handled status. |
ad7f8a1f DA |
4408 | * @mgr: manager to use |
4409 | * | |
17e03aa8 | 4410 | * Tries waiting for the MST hub to finish updating it's payload table by |
873a95e0 LP |
4411 | * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really |
4412 | * take that long). | |
17e03aa8 LP |
4413 | * |
4414 | * Returns: | |
4415 | * 0 if the ACT was handled in time, negative error code on failure. | |
ad7f8a1f DA |
4416 | */ |
4417 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) | |
4418 | { | |
873a95e0 LP |
4419 | /* |
4420 | * There doesn't seem to be any recommended retry count or timeout in | |
4421 | * the MST specification. Since some hubs have been observed to take | |
4422 | * over 1 second to update their payload allocations under certain | |
4423 | * conditions, we use a rather large timeout value. | |
4424 | */ | |
4425 | const int timeout_ms = 3000; | |
4426 | int ret, status; | |
4427 | ||
4428 | ret = readx_poll_timeout(do_get_act_status, mgr->aux, status, | |
4429 | status & DP_PAYLOAD_ACT_HANDLED || status < 0, | |
4430 | 200, timeout_ms * USEC_PER_MSEC); | |
4431 | if (ret < 0 && status >= 0) { | |
4d1b58d5 LP |
4432 | DRM_ERROR("Failed to get ACT after %dms, last status: %02x\n", |
4433 | timeout_ms, status); | |
a5cb5fa6 | 4434 | return -EINVAL; |
873a95e0 | 4435 | } else if (status < 0) { |
4d1b58d5 LP |
4436 | /* |
4437 | * Failure here isn't unexpected - the hub may have | |
4438 | * just been unplugged | |
4439 | */ | |
873a95e0 LP |
4440 | DRM_DEBUG_KMS("Failed to read payload table status: %d\n", |
4441 | status); | |
4442 | return status; | |
ad7f8a1f | 4443 | } |
873a95e0 | 4444 | |
ad7f8a1f | 4445 | return 0; |
ad7f8a1f DA |
4446 | } |
4447 | EXPORT_SYMBOL(drm_dp_check_act_status); | |
4448 | ||
4449 | /** | |
4450 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. | |
4451 | * @clock: dot clock for the mode | |
4452 | * @bpp: bpp for the mode. | |
dc48529f | 4453 | * @dsc: DSC mode. If true, bpp has units of 1/16 of a bit per pixel |
ad7f8a1f DA |
4454 | * |
4455 | * This uses the formula in the spec to calculate the PBN value for a mode. | |
4456 | */ | |
dc48529f | 4457 | int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc) |
ad7f8a1f | 4458 | { |
a9ebb3e4 HW |
4459 | /* |
4460 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 | |
4461 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on | |
4462 | * common multiplier to render an integer PBN for all link rate/lane | |
4463 | * counts combinations | |
4464 | * calculate | |
4465 | * peak_kbps *= (1006/1000) | |
4466 | * peak_kbps *= (64/54) | |
4467 | * peak_kbps *= 8 convert to bytes | |
dc48529f DF |
4468 | * |
4469 | * If the bpp is in units of 1/16, further divide by 16. Put this | |
4470 | * factor in the numerator rather than the denominator to avoid | |
4471 | * integer overflow | |
a9ebb3e4 | 4472 | */ |
dc48529f DF |
4473 | |
4474 | if (dsc) | |
4475 | return DIV_ROUND_UP_ULL(mul_u32_u32(clock * (bpp / 16), 64 * 1006), | |
4476 | 8 * 54 * 1000 * 1000); | |
4477 | ||
ed20b7d5 VS |
4478 | return DIV_ROUND_UP_ULL(mul_u32_u32(clock * bpp, 64 * 1006), |
4479 | 8 * 54 * 1000 * 1000); | |
ad7f8a1f DA |
4480 | } |
4481 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); | |
4482 | ||
ad7f8a1f DA |
4483 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
4484 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) | |
4485 | { | |
4486 | queue_work(system_long_wq, &mgr->tx_work); | |
4487 | } | |
4488 | ||
4489 | static void drm_dp_mst_dump_mstb(struct seq_file *m, | |
4490 | struct drm_dp_mst_branch *mstb) | |
4491 | { | |
4492 | struct drm_dp_mst_port *port; | |
4493 | int tabs = mstb->lct; | |
4494 | char prefix[10]; | |
4495 | int i; | |
4496 | ||
4497 | for (i = 0; i < tabs; i++) | |
4498 | prefix[i] = '\t'; | |
4499 | prefix[i] = '\0'; | |
4500 | ||
4501 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); | |
4502 | list_for_each_entry(port, &mstb->ports, next) { | |
51108f25 | 4503 | seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); |
ad7f8a1f DA |
4504 | if (port->mstb) |
4505 | drm_dp_mst_dump_mstb(m, port->mstb); | |
4506 | } | |
4507 | } | |
4508 | ||
7056a2bc AS |
4509 | #define DP_PAYLOAD_TABLE_SIZE 64 |
4510 | ||
ad7f8a1f DA |
4511 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
4512 | char *buf) | |
4513 | { | |
ad7f8a1f | 4514 | int i; |
46466b0d | 4515 | |
7056a2bc | 4516 | for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) { |
46466b0d JP |
4517 | if (drm_dp_dpcd_read(mgr->aux, |
4518 | DP_PAYLOAD_TABLE_UPDATE_STATUS + i, | |
4519 | &buf[i], 16) != 16) | |
4520 | return false; | |
ad7f8a1f | 4521 | } |
46466b0d | 4522 | return true; |
ad7f8a1f DA |
4523 | } |
4524 | ||
51108f25 JB |
4525 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
4526 | struct drm_dp_mst_port *port, char *name, | |
4527 | int namelen) | |
4528 | { | |
4529 | struct edid *mst_edid; | |
4530 | ||
4531 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); | |
4532 | drm_edid_get_monitor_name(mst_edid, name, namelen); | |
4533 | } | |
4534 | ||
ad7f8a1f DA |
4535 | /** |
4536 | * drm_dp_mst_dump_topology(): dump topology to seq file. | |
4537 | * @m: seq_file to dump output to | |
4538 | * @mgr: manager to dump current topology for. | |
4539 | * | |
4540 | * helper to dump MST topology to a seq file for debugfs. | |
4541 | */ | |
4542 | void drm_dp_mst_dump_topology(struct seq_file *m, | |
4543 | struct drm_dp_mst_topology_mgr *mgr) | |
4544 | { | |
4545 | int i; | |
4546 | struct drm_dp_mst_port *port; | |
51108f25 | 4547 | |
ad7f8a1f DA |
4548 | mutex_lock(&mgr->lock); |
4549 | if (mgr->mst_primary) | |
4550 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); | |
4551 | ||
4552 | /* dump VCPIs */ | |
4553 | mutex_unlock(&mgr->lock); | |
4554 | ||
4555 | mutex_lock(&mgr->payload_lock); | |
51108f25 JB |
4556 | seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, |
4557 | mgr->max_payloads); | |
ad7f8a1f DA |
4558 | |
4559 | for (i = 0; i < mgr->max_payloads; i++) { | |
4560 | if (mgr->proposed_vcpis[i]) { | |
51108f25 JB |
4561 | char name[14]; |
4562 | ||
ad7f8a1f | 4563 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
51108f25 JB |
4564 | fetch_monitor_name(mgr, port, name, sizeof(name)); |
4565 | seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, | |
4566 | port->port_num, port->vcpi.vcpi, | |
4567 | port->vcpi.num_slots, | |
4568 | (*name != 0) ? name : "Unknown"); | |
ad7f8a1f | 4569 | } else |
51108f25 | 4570 | seq_printf(m, "vcpi %d:unused\n", i); |
ad7f8a1f DA |
4571 | } |
4572 | for (i = 0; i < mgr->max_payloads; i++) { | |
4573 | seq_printf(m, "payload %d: %d, %d, %d\n", | |
4574 | i, | |
4575 | mgr->payloads[i].payload_state, | |
4576 | mgr->payloads[i].start_slot, | |
4577 | mgr->payloads[i].num_slots); | |
4578 | ||
4579 | ||
4580 | } | |
4581 | mutex_unlock(&mgr->payload_lock); | |
4582 | ||
4583 | mutex_lock(&mgr->lock); | |
4584 | if (mgr->mst_primary) { | |
7056a2bc | 4585 | u8 buf[DP_PAYLOAD_TABLE_SIZE]; |
ad7f8a1f | 4586 | int ret; |
46466b0d | 4587 | |
ad7f8a1f | 4588 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); |
cb897542 BG |
4589 | if (ret) { |
4590 | seq_printf(m, "dpcd read failed\n"); | |
4591 | goto out; | |
4592 | } | |
46466b0d | 4593 | seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); |
cb897542 | 4594 | |
ad7f8a1f | 4595 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); |
cb897542 BG |
4596 | if (ret) { |
4597 | seq_printf(m, "faux/mst read failed\n"); | |
4598 | goto out; | |
4599 | } | |
46466b0d | 4600 | seq_printf(m, "faux/mst: %*ph\n", 2, buf); |
cb897542 | 4601 | |
ad7f8a1f | 4602 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); |
cb897542 BG |
4603 | if (ret) { |
4604 | seq_printf(m, "mst ctrl read failed\n"); | |
4605 | goto out; | |
4606 | } | |
46466b0d | 4607 | seq_printf(m, "mst ctrl: %*ph\n", 1, buf); |
ad7f8a1f | 4608 | |
44790462 DA |
4609 | /* dump the standard OUI branch header */ |
4610 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); | |
cb897542 BG |
4611 | if (ret) { |
4612 | seq_printf(m, "branch oui read failed\n"); | |
4613 | goto out; | |
4614 | } | |
46466b0d | 4615 | seq_printf(m, "branch oui: %*phN devid: ", 3, buf); |
cb897542 | 4616 | |
51108f25 | 4617 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
44790462 | 4618 | seq_printf(m, "%c", buf[i]); |
46466b0d JP |
4619 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", |
4620 | buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); | |
4621 | if (dump_dp_payload_table(mgr, buf)) | |
7056a2bc | 4622 | seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf); |
ad7f8a1f DA |
4623 | } |
4624 | ||
cb897542 | 4625 | out: |
ad7f8a1f DA |
4626 | mutex_unlock(&mgr->lock); |
4627 | ||
4628 | } | |
4629 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); | |
4630 | ||
4631 | static void drm_dp_tx_work(struct work_struct *work) | |
4632 | { | |
4633 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); | |
4634 | ||
4635 | mutex_lock(&mgr->qlock); | |
d308a881 | 4636 | if (!list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
4637 | process_single_down_tx_qlock(mgr); |
4638 | mutex_unlock(&mgr->qlock); | |
4639 | } | |
4640 | ||
72dc0f51 LP |
4641 | static inline void |
4642 | drm_dp_delayed_destroy_port(struct drm_dp_mst_port *port) | |
e1ae63b3 | 4643 | { |
72dc0f51 | 4644 | if (port->connector) { |
e1ae63b3 PB |
4645 | drm_connector_unregister(port->connector); |
4646 | drm_connector_put(port->connector); | |
4647 | } | |
7cb12d48 | 4648 | |
db1a0795 | 4649 | drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE, port->mcs); |
7cb12d48 LP |
4650 | drm_dp_mst_put_port_malloc(port); |
4651 | } | |
4652 | ||
4653 | static inline void | |
4654 | drm_dp_delayed_destroy_mstb(struct drm_dp_mst_branch *mstb) | |
4655 | { | |
4656 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
d308a881 LP |
4657 | struct drm_dp_mst_port *port, *port_tmp; |
4658 | struct drm_dp_sideband_msg_tx *txmsg, *txmsg_tmp; | |
7cb12d48 LP |
4659 | bool wake_tx = false; |
4660 | ||
4661 | mutex_lock(&mgr->lock); | |
d308a881 | 4662 | list_for_each_entry_safe(port, port_tmp, &mstb->ports, next) { |
7cb12d48 LP |
4663 | list_del(&port->next); |
4664 | drm_dp_mst_topology_put_port(port); | |
4665 | } | |
4666 | mutex_unlock(&mgr->lock); | |
4667 | ||
d308a881 | 4668 | /* drop any tx slot msg */ |
7cb12d48 | 4669 | mutex_lock(&mstb->mgr->qlock); |
d308a881 LP |
4670 | list_for_each_entry_safe(txmsg, txmsg_tmp, &mgr->tx_msg_downq, next) { |
4671 | if (txmsg->dst != mstb) | |
4672 | continue; | |
4673 | ||
4674 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
4675 | list_del(&txmsg->next); | |
7cb12d48 LP |
4676 | wake_tx = true; |
4677 | } | |
4678 | mutex_unlock(&mstb->mgr->qlock); | |
4679 | ||
4680 | if (wake_tx) | |
4681 | wake_up_all(&mstb->mgr->tx_waitq); | |
4682 | ||
4683 | drm_dp_mst_put_mstb_malloc(mstb); | |
4684 | } | |
4685 | ||
4686 | static void drm_dp_delayed_destroy_work(struct work_struct *work) | |
4687 | { | |
4688 | struct drm_dp_mst_topology_mgr *mgr = | |
4689 | container_of(work, struct drm_dp_mst_topology_mgr, | |
4690 | delayed_destroy_work); | |
4691 | bool send_hotplug = false, go_again; | |
4692 | ||
6b8eeca6 DA |
4693 | /* |
4694 | * Not a regular list traverse as we have to drop the destroy | |
7cb12d48 | 4695 | * connector lock before destroying the mstb/port, to avoid AB->BA |
6b8eeca6 DA |
4696 | * ordering between this lock and the config mutex. |
4697 | */ | |
7cb12d48 LP |
4698 | do { |
4699 | go_again = false; | |
4700 | ||
4701 | for (;;) { | |
4702 | struct drm_dp_mst_branch *mstb; | |
4703 | ||
4704 | mutex_lock(&mgr->delayed_destroy_lock); | |
4705 | mstb = list_first_entry_or_null(&mgr->destroy_branch_device_list, | |
4706 | struct drm_dp_mst_branch, | |
4707 | destroy_next); | |
4708 | if (mstb) | |
4709 | list_del(&mstb->destroy_next); | |
4710 | mutex_unlock(&mgr->delayed_destroy_lock); | |
4711 | ||
4712 | if (!mstb) | |
4713 | break; | |
4714 | ||
4715 | drm_dp_delayed_destroy_mstb(mstb); | |
4716 | go_again = true; | |
6b8eeca6 | 4717 | } |
6b8eeca6 | 4718 | |
7cb12d48 LP |
4719 | for (;;) { |
4720 | struct drm_dp_mst_port *port; | |
4772ff03 | 4721 | |
7cb12d48 LP |
4722 | mutex_lock(&mgr->delayed_destroy_lock); |
4723 | port = list_first_entry_or_null(&mgr->destroy_port_list, | |
4724 | struct drm_dp_mst_port, | |
4725 | next); | |
4726 | if (port) | |
4727 | list_del(&port->next); | |
4728 | mutex_unlock(&mgr->delayed_destroy_lock); | |
4729 | ||
4730 | if (!port) | |
4731 | break; | |
4732 | ||
4733 | drm_dp_delayed_destroy_port(port); | |
4734 | send_hotplug = true; | |
4735 | go_again = true; | |
4736 | } | |
4737 | } while (go_again); | |
4772ff03 | 4738 | |
df4839fd | 4739 | if (send_hotplug) |
16bff572 | 4740 | drm_kms_helper_hotplug_event(mgr->dev); |
6b8eeca6 DA |
4741 | } |
4742 | ||
a4370c77 VS |
4743 | static struct drm_private_state * |
4744 | drm_dp_mst_duplicate_state(struct drm_private_obj *obj) | |
3f3353b7 | 4745 | { |
eceae147 LP |
4746 | struct drm_dp_mst_topology_state *state, *old_state = |
4747 | to_dp_mst_topology_state(obj->state); | |
4748 | struct drm_dp_vcpi_allocation *pos, *vcpi; | |
3f3353b7 | 4749 | |
eceae147 | 4750 | state = kmemdup(old_state, sizeof(*state), GFP_KERNEL); |
a4370c77 | 4751 | if (!state) |
3f3353b7 PD |
4752 | return NULL; |
4753 | ||
a4370c77 | 4754 | __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); |
3f3353b7 | 4755 | |
eceae147 LP |
4756 | INIT_LIST_HEAD(&state->vcpis); |
4757 | ||
4758 | list_for_each_entry(pos, &old_state->vcpis, next) { | |
4759 | /* Prune leftover freed VCPI allocations */ | |
4760 | if (!pos->vcpi) | |
4761 | continue; | |
4762 | ||
4763 | vcpi = kmemdup(pos, sizeof(*vcpi), GFP_KERNEL); | |
4764 | if (!vcpi) | |
4765 | goto fail; | |
4766 | ||
4767 | drm_dp_mst_get_port_malloc(vcpi->port); | |
4768 | list_add(&vcpi->next, &state->vcpis); | |
4769 | } | |
4770 | ||
a4370c77 | 4771 | return &state->base; |
eceae147 LP |
4772 | |
4773 | fail: | |
4774 | list_for_each_entry_safe(pos, vcpi, &state->vcpis, next) { | |
4775 | drm_dp_mst_put_port_malloc(pos->port); | |
4776 | kfree(pos); | |
4777 | } | |
4778 | kfree(state); | |
4779 | ||
4780 | return NULL; | |
3f3353b7 PD |
4781 | } |
4782 | ||
a4370c77 VS |
4783 | static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, |
4784 | struct drm_private_state *state) | |
3f3353b7 | 4785 | { |
a4370c77 VS |
4786 | struct drm_dp_mst_topology_state *mst_state = |
4787 | to_dp_mst_topology_state(state); | |
eceae147 LP |
4788 | struct drm_dp_vcpi_allocation *pos, *tmp; |
4789 | ||
4790 | list_for_each_entry_safe(pos, tmp, &mst_state->vcpis, next) { | |
4791 | /* We only keep references to ports with non-zero VCPIs */ | |
4792 | if (pos->vcpi) | |
4793 | drm_dp_mst_put_port_malloc(pos->port); | |
4794 | kfree(pos); | |
4795 | } | |
a4370c77 VS |
4796 | |
4797 | kfree(mst_state); | |
3f3353b7 PD |
4798 | } |
4799 | ||
cd82d82c ML |
4800 | static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, |
4801 | struct drm_dp_mst_branch *branch) | |
4802 | { | |
4803 | while (port->parent) { | |
4804 | if (port->parent == branch) | |
4805 | return true; | |
4806 | ||
4807 | if (port->parent->port_parent) | |
4808 | port = port->parent->port_parent; | |
4809 | else | |
4810 | break; | |
4811 | } | |
4812 | return false; | |
4813 | } | |
4814 | ||
047d4cd2 LP |
4815 | static int |
4816 | drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, | |
4817 | struct drm_dp_mst_topology_state *state); | |
4818 | ||
4819 | static int | |
4820 | drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb, | |
4821 | struct drm_dp_mst_topology_state *state) | |
cd82d82c | 4822 | { |
cd82d82c | 4823 | struct drm_dp_vcpi_allocation *vcpi; |
047d4cd2 LP |
4824 | struct drm_dp_mst_port *port; |
4825 | int pbn_used = 0, ret; | |
4826 | bool found = false; | |
cd82d82c | 4827 | |
047d4cd2 LP |
4828 | /* Check that we have at least one port in our state that's downstream |
4829 | * of this branch, otherwise we can skip this branch | |
4830 | */ | |
4831 | list_for_each_entry(vcpi, &state->vcpis, next) { | |
4832 | if (!vcpi->pbn || | |
4833 | !drm_dp_mst_port_downstream_of_branch(vcpi->port, mstb)) | |
4834 | continue; | |
cd82d82c | 4835 | |
047d4cd2 LP |
4836 | found = true; |
4837 | break; | |
cd82d82c | 4838 | } |
047d4cd2 LP |
4839 | if (!found) |
4840 | return 0; | |
cd82d82c | 4841 | |
047d4cd2 LP |
4842 | if (mstb->port_parent) |
4843 | DRM_DEBUG_ATOMIC("[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n", | |
4844 | mstb->port_parent->parent, mstb->port_parent, | |
4845 | mstb); | |
4846 | else | |
4847 | DRM_DEBUG_ATOMIC("[MSTB:%p] Checking bandwidth limits\n", | |
4848 | mstb); | |
4849 | ||
4850 | list_for_each_entry(port, &mstb->ports, next) { | |
4851 | ret = drm_dp_mst_atomic_check_port_bw_limit(port, state); | |
4852 | if (ret < 0) | |
4853 | return ret; | |
cd82d82c | 4854 | |
047d4cd2 | 4855 | pbn_used += ret; |
cd82d82c | 4856 | } |
cd82d82c | 4857 | |
047d4cd2 LP |
4858 | return pbn_used; |
4859 | } | |
4860 | ||
4861 | static int | |
4862 | drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, | |
4863 | struct drm_dp_mst_topology_state *state) | |
4864 | { | |
4865 | struct drm_dp_vcpi_allocation *vcpi; | |
4866 | int pbn_used = 0; | |
4867 | ||
4868 | if (port->pdt == DP_PEER_DEVICE_NONE) | |
4869 | return 0; | |
4870 | ||
4871 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { | |
4872 | bool found = false; | |
4873 | ||
4874 | list_for_each_entry(vcpi, &state->vcpis, next) { | |
4875 | if (vcpi->port != port) | |
4876 | continue; | |
4877 | if (!vcpi->pbn) | |
4878 | return 0; | |
4879 | ||
4880 | found = true; | |
4881 | break; | |
4882 | } | |
4883 | if (!found) | |
4884 | return 0; | |
cd82d82c | 4885 | |
047d4cd2 LP |
4886 | /* This should never happen, as it means we tried to |
4887 | * set a mode before querying the full_pbn | |
4888 | */ | |
4889 | if (WARN_ON(!port->full_pbn)) | |
4890 | return -EINVAL; | |
4891 | ||
4892 | pbn_used = vcpi->pbn; | |
4893 | } else { | |
4894 | pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb, | |
4895 | state); | |
4896 | if (pbn_used <= 0) | |
4897 | return pbn_used; | |
cd82d82c | 4898 | } |
cd82d82c | 4899 | |
047d4cd2 LP |
4900 | if (pbn_used > port->full_pbn) { |
4901 | DRM_DEBUG_ATOMIC("[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n", | |
4902 | port->parent, port, pbn_used, | |
4903 | port->full_pbn); | |
cd82d82c ML |
4904 | return -ENOSPC; |
4905 | } | |
047d4cd2 LP |
4906 | |
4907 | DRM_DEBUG_ATOMIC("[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n", | |
4908 | port->parent, port, pbn_used, port->full_pbn); | |
4909 | ||
4910 | return pbn_used; | |
cd82d82c ML |
4911 | } |
4912 | ||
eceae147 | 4913 | static inline int |
9e5b9590 ML |
4914 | drm_dp_mst_atomic_check_vcpi_alloc_limit(struct drm_dp_mst_topology_mgr *mgr, |
4915 | struct drm_dp_mst_topology_state *mst_state) | |
eceae147 LP |
4916 | { |
4917 | struct drm_dp_vcpi_allocation *vcpi; | |
5e187a01 | 4918 | int avail_slots = 63, payload_count = 0; |
eceae147 LP |
4919 | |
4920 | list_for_each_entry(vcpi, &mst_state->vcpis, next) { | |
4921 | /* Releasing VCPI is always OK-even if the port is gone */ | |
4922 | if (!vcpi->vcpi) { | |
4923 | DRM_DEBUG_ATOMIC("[MST PORT:%p] releases all VCPI slots\n", | |
4924 | vcpi->port); | |
4925 | continue; | |
4926 | } | |
4927 | ||
4928 | DRM_DEBUG_ATOMIC("[MST PORT:%p] requires %d vcpi slots\n", | |
4929 | vcpi->port, vcpi->vcpi); | |
4930 | ||
4931 | avail_slots -= vcpi->vcpi; | |
4932 | if (avail_slots < 0) { | |
4933 | DRM_DEBUG_ATOMIC("[MST PORT:%p] not enough VCPI slots in mst state %p (avail=%d)\n", | |
4934 | vcpi->port, mst_state, | |
4935 | avail_slots + vcpi->vcpi); | |
4936 | return -ENOSPC; | |
4937 | } | |
5e187a01 LP |
4938 | |
4939 | if (++payload_count > mgr->max_payloads) { | |
4940 | DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p has too many payloads (max=%d)\n", | |
4941 | mgr, mst_state, mgr->max_payloads); | |
4942 | return -EINVAL; | |
4943 | } | |
eceae147 LP |
4944 | } |
4945 | DRM_DEBUG_ATOMIC("[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n", | |
4946 | mgr, mst_state, avail_slots, | |
4947 | 63 - avail_slots); | |
4948 | ||
4949 | return 0; | |
4950 | } | |
4951 | ||
8ec04671 ML |
4952 | /** |
4953 | * drm_dp_mst_add_affected_dsc_crtcs | |
4954 | * @state: Pointer to the new struct drm_dp_mst_topology_state | |
9edb435a | 4955 | * @mgr: MST topology manager |
8ec04671 ML |
4956 | * |
4957 | * Whenever there is a change in mst topology | |
4958 | * DSC configuration would have to be recalculated | |
4959 | * therefore we need to trigger modeset on all affected | |
4960 | * CRTCs in that topology | |
4961 | * | |
4962 | * See also: | |
4963 | * drm_dp_mst_atomic_enable_dsc() | |
4964 | */ | |
4965 | int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr) | |
4966 | { | |
4967 | struct drm_dp_mst_topology_state *mst_state; | |
4968 | struct drm_dp_vcpi_allocation *pos; | |
4969 | struct drm_connector *connector; | |
4970 | struct drm_connector_state *conn_state; | |
4971 | struct drm_crtc *crtc; | |
4972 | struct drm_crtc_state *crtc_state; | |
4973 | ||
4974 | mst_state = drm_atomic_get_mst_topology_state(state, mgr); | |
4975 | ||
4976 | if (IS_ERR(mst_state)) | |
4977 | return -EINVAL; | |
4978 | ||
4979 | list_for_each_entry(pos, &mst_state->vcpis, next) { | |
4980 | ||
4981 | connector = pos->port->connector; | |
4982 | ||
4983 | if (!connector) | |
4984 | return -EINVAL; | |
4985 | ||
4986 | conn_state = drm_atomic_get_connector_state(state, connector); | |
4987 | ||
4988 | if (IS_ERR(conn_state)) | |
4989 | return PTR_ERR(conn_state); | |
4990 | ||
4991 | crtc = conn_state->crtc; | |
4992 | ||
4993 | if (WARN_ON(!crtc)) | |
4994 | return -EINVAL; | |
4995 | ||
4996 | if (!drm_dp_mst_dsc_aux_for_port(pos->port)) | |
4997 | continue; | |
4998 | ||
4999 | crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc); | |
5000 | ||
5001 | if (IS_ERR(crtc_state)) | |
5002 | return PTR_ERR(crtc_state); | |
5003 | ||
5004 | DRM_DEBUG_ATOMIC("[MST MGR:%p] Setting mode_changed flag on CRTC %p\n", | |
5005 | mgr, crtc); | |
5006 | ||
5007 | crtc_state->mode_changed = true; | |
5008 | } | |
5009 | return 0; | |
5010 | } | |
5011 | EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs); | |
5012 | ||
8afb7e6a ML |
5013 | /** |
5014 | * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off | |
5015 | * @state: Pointer to the new drm_atomic_state | |
5016 | * @port: Pointer to the affected MST Port | |
5017 | * @pbn: Newly recalculated bw required for link with DSC enabled | |
5018 | * @pbn_div: Divider to calculate correct number of pbn per slot | |
5019 | * @enable: Boolean flag to enable or disable DSC on the port | |
5020 | * | |
5021 | * This function enables DSC on the given Port | |
5022 | * by recalculating its vcpi from pbn provided | |
5023 | * and sets dsc_enable flag to keep track of which | |
5024 | * ports have DSC enabled | |
5025 | * | |
5026 | */ | |
5027 | int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, | |
5028 | struct drm_dp_mst_port *port, | |
5029 | int pbn, int pbn_div, | |
5030 | bool enable) | |
5031 | { | |
5032 | struct drm_dp_mst_topology_state *mst_state; | |
5033 | struct drm_dp_vcpi_allocation *pos; | |
5034 | bool found = false; | |
5035 | int vcpi = 0; | |
5036 | ||
5037 | mst_state = drm_atomic_get_mst_topology_state(state, port->mgr); | |
5038 | ||
5039 | if (IS_ERR(mst_state)) | |
5040 | return PTR_ERR(mst_state); | |
5041 | ||
5042 | list_for_each_entry(pos, &mst_state->vcpis, next) { | |
5043 | if (pos->port == port) { | |
5044 | found = true; | |
5045 | break; | |
5046 | } | |
5047 | } | |
5048 | ||
5049 | if (!found) { | |
5050 | DRM_DEBUG_ATOMIC("[MST PORT:%p] Couldn't find VCPI allocation in mst state %p\n", | |
5051 | port, mst_state); | |
5052 | return -EINVAL; | |
5053 | } | |
5054 | ||
5055 | if (pos->dsc_enabled == enable) { | |
5056 | DRM_DEBUG_ATOMIC("[MST PORT:%p] DSC flag is already set to %d, returning %d VCPI slots\n", | |
5057 | port, enable, pos->vcpi); | |
5058 | vcpi = pos->vcpi; | |
5059 | } | |
5060 | ||
5061 | if (enable) { | |
5062 | vcpi = drm_dp_atomic_find_vcpi_slots(state, port->mgr, port, pbn, pbn_div); | |
5063 | DRM_DEBUG_ATOMIC("[MST PORT:%p] Enabling DSC flag, reallocating %d VCPI slots on the port\n", | |
5064 | port, vcpi); | |
5065 | if (vcpi < 0) | |
5066 | return -EINVAL; | |
5067 | } | |
5068 | ||
5069 | pos->dsc_enabled = enable; | |
5070 | ||
5071 | return vcpi; | |
5072 | } | |
5073 | EXPORT_SYMBOL(drm_dp_mst_atomic_enable_dsc); | |
eceae147 LP |
5074 | /** |
5075 | * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an | |
5076 | * atomic update is valid | |
5077 | * @state: Pointer to the new &struct drm_dp_mst_topology_state | |
5078 | * | |
5079 | * Checks the given topology state for an atomic update to ensure that it's | |
5080 | * valid. This includes checking whether there's enough bandwidth to support | |
5081 | * the new VCPI allocations in the atomic update. | |
5082 | * | |
5083 | * Any atomic drivers supporting DP MST must make sure to call this after | |
5084 | * checking the rest of their state in their | |
5085 | * &drm_mode_config_funcs.atomic_check() callback. | |
5086 | * | |
5087 | * See also: | |
5088 | * drm_dp_atomic_find_vcpi_slots() | |
5089 | * drm_dp_atomic_release_vcpi_slots() | |
5090 | * | |
5091 | * Returns: | |
5092 | * | |
5093 | * 0 if the new state is valid, negative error code otherwise. | |
5094 | */ | |
5095 | int drm_dp_mst_atomic_check(struct drm_atomic_state *state) | |
5096 | { | |
5097 | struct drm_dp_mst_topology_mgr *mgr; | |
5098 | struct drm_dp_mst_topology_state *mst_state; | |
5099 | int i, ret = 0; | |
5100 | ||
5101 | for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) { | |
7b199143 JRS |
5102 | if (!mgr->mst_state) |
5103 | continue; | |
5104 | ||
9e5b9590 | 5105 | ret = drm_dp_mst_atomic_check_vcpi_alloc_limit(mgr, mst_state); |
eceae147 LP |
5106 | if (ret) |
5107 | break; | |
047d4cd2 LP |
5108 | |
5109 | mutex_lock(&mgr->lock); | |
5110 | ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary, | |
5111 | mst_state); | |
5112 | mutex_unlock(&mgr->lock); | |
5113 | if (ret < 0) | |
eceae147 | 5114 | break; |
047d4cd2 LP |
5115 | else |
5116 | ret = 0; | |
eceae147 LP |
5117 | } |
5118 | ||
5119 | return ret; | |
5120 | } | |
5121 | EXPORT_SYMBOL(drm_dp_mst_atomic_check); | |
5122 | ||
bea5c38f | 5123 | const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs = { |
a4370c77 VS |
5124 | .atomic_duplicate_state = drm_dp_mst_duplicate_state, |
5125 | .atomic_destroy_state = drm_dp_mst_destroy_state, | |
3f3353b7 | 5126 | }; |
bea5c38f | 5127 | EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs); |
3f3353b7 PD |
5128 | |
5129 | /** | |
5130 | * drm_atomic_get_mst_topology_state: get MST topology state | |
5131 | * | |
5132 | * @state: global atomic state | |
5133 | * @mgr: MST topology manager, also the private object in this case | |
5134 | * | |
5135 | * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic | |
5136 | * state vtable so that the private object state returned is that of a MST | |
5137 | * topology object. Also, drm_atomic_get_private_obj_state() expects the caller | |
5138 | * to care of the locking, so warn if don't hold the connection_mutex. | |
5139 | * | |
5140 | * RETURNS: | |
5141 | * | |
5142 | * The MST topology state or error pointer. | |
5143 | */ | |
5144 | struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, | |
5145 | struct drm_dp_mst_topology_mgr *mgr) | |
5146 | { | |
a4370c77 | 5147 | return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base)); |
3f3353b7 PD |
5148 | } |
5149 | EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); | |
5150 | ||
ad7f8a1f DA |
5151 | /** |
5152 | * drm_dp_mst_topology_mgr_init - initialise a topology manager | |
5153 | * @mgr: manager struct to initialise | |
5154 | * @dev: device providing this structure - for i2c addition. | |
5155 | * @aux: DP helper aux channel to talk to this device | |
5156 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit | |
5157 | * @max_payloads: maximum number of payloads this GPU can source | |
5158 | * @conn_base_id: the connector object ID the MST device is connected to. | |
5159 | * | |
5160 | * Return 0 for success, or negative error code on failure | |
5161 | */ | |
5162 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, | |
7b0a89a6 | 5163 | struct drm_device *dev, struct drm_dp_aux *aux, |
ad7f8a1f DA |
5164 | int max_dpcd_transaction_bytes, |
5165 | int max_payloads, int conn_base_id) | |
5166 | { | |
a4370c77 VS |
5167 | struct drm_dp_mst_topology_state *mst_state; |
5168 | ||
ad7f8a1f DA |
5169 | mutex_init(&mgr->lock); |
5170 | mutex_init(&mgr->qlock); | |
5171 | mutex_init(&mgr->payload_lock); | |
7cb12d48 | 5172 | mutex_init(&mgr->delayed_destroy_lock); |
9408cc94 | 5173 | mutex_init(&mgr->up_req_lock); |
14692a36 | 5174 | mutex_init(&mgr->probe_lock); |
12a280c7 LP |
5175 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
5176 | mutex_init(&mgr->topology_ref_history_lock); | |
5177 | #endif | |
ad7f8a1f | 5178 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
7cb12d48 LP |
5179 | INIT_LIST_HEAD(&mgr->destroy_port_list); |
5180 | INIT_LIST_HEAD(&mgr->destroy_branch_device_list); | |
9408cc94 | 5181 | INIT_LIST_HEAD(&mgr->up_req_list); |
ad7f8a1f DA |
5182 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
5183 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); | |
7cb12d48 | 5184 | INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work); |
9408cc94 | 5185 | INIT_WORK(&mgr->up_req_work, drm_dp_mst_up_req_work); |
ad7f8a1f DA |
5186 | init_waitqueue_head(&mgr->tx_waitq); |
5187 | mgr->dev = dev; | |
5188 | mgr->aux = aux; | |
5189 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; | |
5190 | mgr->max_payloads = max_payloads; | |
5191 | mgr->conn_base_id = conn_base_id; | |
4d6a10da ID |
5192 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
5193 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) | |
5194 | return -EINVAL; | |
ad7f8a1f DA |
5195 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
5196 | if (!mgr->payloads) | |
5197 | return -ENOMEM; | |
5198 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); | |
5199 | if (!mgr->proposed_vcpis) | |
5200 | return -ENOMEM; | |
5201 | set_bit(0, &mgr->payload_mask); | |
441388a8 | 5202 | |
a4370c77 VS |
5203 | mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL); |
5204 | if (mst_state == NULL) | |
3f3353b7 | 5205 | return -ENOMEM; |
a4370c77 VS |
5206 | |
5207 | mst_state->mgr = mgr; | |
eceae147 | 5208 | INIT_LIST_HEAD(&mst_state->vcpis); |
a4370c77 | 5209 | |
b962a120 | 5210 | drm_atomic_private_obj_init(dev, &mgr->base, |
a4370c77 | 5211 | &mst_state->base, |
bea5c38f | 5212 | &drm_dp_mst_topology_state_funcs); |
3f3353b7 | 5213 | |
ad7f8a1f DA |
5214 | return 0; |
5215 | } | |
5216 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); | |
5217 | ||
5218 | /** | |
5219 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. | |
5220 | * @mgr: manager to destroy | |
5221 | */ | |
5222 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) | |
5223 | { | |
f536e00c | 5224 | drm_dp_mst_topology_mgr_set_mst(mgr, false); |
274d8352 | 5225 | flush_work(&mgr->work); |
7cb12d48 | 5226 | cancel_work_sync(&mgr->delayed_destroy_work); |
ad7f8a1f DA |
5227 | mutex_lock(&mgr->payload_lock); |
5228 | kfree(mgr->payloads); | |
5229 | mgr->payloads = NULL; | |
5230 | kfree(mgr->proposed_vcpis); | |
5231 | mgr->proposed_vcpis = NULL; | |
5232 | mutex_unlock(&mgr->payload_lock); | |
5233 | mgr->dev = NULL; | |
5234 | mgr->aux = NULL; | |
a4370c77 | 5235 | drm_atomic_private_obj_fini(&mgr->base); |
3f3353b7 | 5236 | mgr->funcs = NULL; |
50094b5d | 5237 | |
7cb12d48 | 5238 | mutex_destroy(&mgr->delayed_destroy_lock); |
50094b5d LP |
5239 | mutex_destroy(&mgr->payload_lock); |
5240 | mutex_destroy(&mgr->qlock); | |
5241 | mutex_destroy(&mgr->lock); | |
9408cc94 | 5242 | mutex_destroy(&mgr->up_req_lock); |
14692a36 | 5243 | mutex_destroy(&mgr->probe_lock); |
12a280c7 LP |
5244 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
5245 | mutex_destroy(&mgr->topology_ref_history_lock); | |
5246 | #endif | |
ad7f8a1f DA |
5247 | } |
5248 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); | |
5249 | ||
cb8ce711 VS |
5250 | static bool remote_i2c_read_ok(const struct i2c_msg msgs[], int num) |
5251 | { | |
5252 | int i; | |
5253 | ||
5254 | if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS) | |
5255 | return false; | |
5256 | ||
5257 | for (i = 0; i < num - 1; i++) { | |
5258 | if (msgs[i].flags & I2C_M_RD || | |
5259 | msgs[i].len > 0xff) | |
5260 | return false; | |
5261 | } | |
5262 | ||
5263 | return msgs[num - 1].flags & I2C_M_RD && | |
5264 | msgs[num - 1].len <= 0xff; | |
5265 | } | |
5266 | ||
ad7f8a1f DA |
5267 | /* I2C device */ |
5268 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, | |
5269 | int num) | |
5270 | { | |
5271 | struct drm_dp_aux *aux = adapter->algo_data; | |
5272 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); | |
5273 | struct drm_dp_mst_branch *mstb; | |
5274 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
5275 | unsigned int i; | |
ad7f8a1f DA |
5276 | struct drm_dp_sideband_msg_req_body msg; |
5277 | struct drm_dp_sideband_msg_tx *txmsg = NULL; | |
5278 | int ret; | |
5279 | ||
d0757afd | 5280 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
ad7f8a1f DA |
5281 | if (!mstb) |
5282 | return -EREMOTEIO; | |
5283 | ||
cb8ce711 | 5284 | if (!remote_i2c_read_ok(msgs, num)) { |
ad7f8a1f DA |
5285 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
5286 | ret = -EIO; | |
5287 | goto out; | |
5288 | } | |
5289 | ||
ae491542 | 5290 | memset(&msg, 0, sizeof(msg)); |
ad7f8a1f DA |
5291 | msg.req_type = DP_REMOTE_I2C_READ; |
5292 | msg.u.i2c_read.num_transactions = num - 1; | |
5293 | msg.u.i2c_read.port_number = port->port_num; | |
5294 | for (i = 0; i < num - 1; i++) { | |
5295 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; | |
5296 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; | |
5297 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; | |
c978ae9b | 5298 | msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP); |
ad7f8a1f DA |
5299 | } |
5300 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; | |
5301 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; | |
5302 | ||
5303 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
5304 | if (!txmsg) { | |
5305 | ret = -ENOMEM; | |
5306 | goto out; | |
5307 | } | |
5308 | ||
5309 | txmsg->dst = mstb; | |
5310 | drm_dp_encode_sideband_req(&msg, txmsg); | |
5311 | ||
5312 | drm_dp_queue_down_tx(mgr, txmsg); | |
5313 | ||
5314 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
5315 | if (ret > 0) { | |
5316 | ||
45bbda1e | 5317 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
ad7f8a1f DA |
5318 | ret = -EREMOTEIO; |
5319 | goto out; | |
5320 | } | |
5321 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { | |
5322 | ret = -EIO; | |
5323 | goto out; | |
5324 | } | |
5325 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); | |
5326 | ret = num; | |
5327 | } | |
5328 | out: | |
5329 | kfree(txmsg); | |
d0757afd | 5330 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
5331 | return ret; |
5332 | } | |
5333 | ||
5334 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) | |
5335 | { | |
5336 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | | |
5337 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | | |
5338 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | | |
5339 | I2C_FUNC_10BIT_ADDR; | |
5340 | } | |
5341 | ||
5342 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { | |
5343 | .functionality = drm_dp_mst_i2c_functionality, | |
5344 | .master_xfer = drm_dp_mst_i2c_xfer, | |
5345 | }; | |
5346 | ||
5347 | /** | |
5348 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX | |
5349 | * @aux: DisplayPort AUX channel | |
5350 | * | |
5351 | * Returns 0 on success or a negative error code on failure. | |
5352 | */ | |
5353 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) | |
5354 | { | |
5355 | aux->ddc.algo = &drm_dp_mst_i2c_algo; | |
5356 | aux->ddc.algo_data = aux; | |
5357 | aux->ddc.retries = 3; | |
5358 | ||
5359 | aux->ddc.class = I2C_CLASS_DDC; | |
5360 | aux->ddc.owner = THIS_MODULE; | |
5361 | aux->ddc.dev.parent = aux->dev; | |
5362 | aux->ddc.dev.of_node = aux->dev->of_node; | |
5363 | ||
5364 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), | |
5365 | sizeof(aux->ddc.name)); | |
5366 | ||
5367 | return i2c_add_adapter(&aux->ddc); | |
5368 | } | |
5369 | ||
5370 | /** | |
5371 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter | |
5372 | * @aux: DisplayPort AUX channel | |
5373 | */ | |
5374 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) | |
5375 | { | |
5376 | i2c_del_adapter(&aux->ddc); | |
5377 | } | |
c2bc1b6e DF |
5378 | |
5379 | /** | |
5380 | * drm_dp_mst_is_virtual_dpcd() - Is the given port a virtual DP Peer Device | |
5381 | * @port: The port to check | |
5382 | * | |
5383 | * A single physical MST hub object can be represented in the topology | |
5384 | * by multiple branches, with virtual ports between those branches. | |
5385 | * | |
5386 | * As of DP1.4, An MST hub with internal (virtual) ports must expose | |
5387 | * certain DPCD registers over those ports. See sections 2.6.1.1.1 | |
5388 | * and 2.6.1.1.2 of Display Port specification v1.4 for details. | |
5389 | * | |
5390 | * May acquire mgr->lock | |
5391 | * | |
5392 | * Returns: | |
5393 | * true if the port is a virtual DP peer device, false otherwise | |
5394 | */ | |
5395 | static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) | |
5396 | { | |
5397 | struct drm_dp_mst_port *downstream_port; | |
5398 | ||
5399 | if (!port || port->dpcd_rev < DP_DPCD_REV_14) | |
5400 | return false; | |
5401 | ||
5402 | /* Virtual DP Sink (Internal Display Panel) */ | |
5403 | if (port->port_num >= 8) | |
5404 | return true; | |
5405 | ||
5406 | /* DP-to-HDMI Protocol Converter */ | |
5407 | if (port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV && | |
5408 | !port->mcs && | |
5409 | port->ldps) | |
5410 | return true; | |
5411 | ||
5412 | /* DP-to-DP */ | |
5413 | mutex_lock(&port->mgr->lock); | |
5414 | if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING && | |
5415 | port->mstb && | |
5416 | port->mstb->num_ports == 2) { | |
5417 | list_for_each_entry(downstream_port, &port->mstb->ports, next) { | |
5418 | if (downstream_port->pdt == DP_PEER_DEVICE_SST_SINK && | |
5419 | !downstream_port->input) { | |
5420 | mutex_unlock(&port->mgr->lock); | |
5421 | return true; | |
5422 | } | |
5423 | } | |
5424 | } | |
5425 | mutex_unlock(&port->mgr->lock); | |
5426 | ||
5427 | return false; | |
5428 | } | |
5429 | ||
5430 | /** | |
5431 | * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC | |
5432 | * @port: The port to check. A leaf of the MST tree with an attached display. | |
5433 | * | |
5434 | * Depending on the situation, DSC may be enabled via the endpoint aux, | |
5435 | * the immediately upstream aux, or the connector's physical aux. | |
5436 | * | |
5437 | * This is both the correct aux to read DSC_CAPABILITY and the | |
5438 | * correct aux to write DSC_ENABLED. | |
5439 | * | |
5440 | * This operation can be expensive (up to four aux reads), so | |
5441 | * the caller should cache the return. | |
5442 | * | |
5443 | * Returns: | |
5444 | * NULL if DSC cannot be enabled on this port, otherwise the aux device | |
5445 | */ | |
5446 | struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) | |
5447 | { | |
5448 | struct drm_dp_mst_port *immediate_upstream_port; | |
5449 | struct drm_dp_mst_port *fec_port; | |
53965dbe | 5450 | struct drm_dp_desc desc = { }; |
c2bc1b6e DF |
5451 | u8 endpoint_fec; |
5452 | u8 endpoint_dsc; | |
5453 | ||
5454 | if (!port) | |
5455 | return NULL; | |
5456 | ||
5457 | if (port->parent->port_parent) | |
5458 | immediate_upstream_port = port->parent->port_parent; | |
5459 | else | |
5460 | immediate_upstream_port = NULL; | |
5461 | ||
5462 | fec_port = immediate_upstream_port; | |
5463 | while (fec_port) { | |
5464 | /* | |
5465 | * Each physical link (i.e. not a virtual port) between the | |
5466 | * output and the primary device must support FEC | |
5467 | */ | |
5468 | if (!drm_dp_mst_is_virtual_dpcd(fec_port) && | |
5469 | !fec_port->fec_capable) | |
5470 | return NULL; | |
5471 | ||
5472 | fec_port = fec_port->parent->port_parent; | |
5473 | } | |
5474 | ||
5475 | /* DP-to-DP peer device */ | |
5476 | if (drm_dp_mst_is_virtual_dpcd(immediate_upstream_port)) { | |
5477 | u8 upstream_dsc; | |
5478 | ||
5479 | if (drm_dp_dpcd_read(&port->aux, | |
5480 | DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1) | |
5481 | return NULL; | |
5482 | if (drm_dp_dpcd_read(&port->aux, | |
5483 | DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1) | |
5484 | return NULL; | |
5485 | if (drm_dp_dpcd_read(&immediate_upstream_port->aux, | |
5486 | DP_DSC_SUPPORT, &upstream_dsc, 1) != 1) | |
5487 | return NULL; | |
5488 | ||
5489 | /* Enpoint decompression with DP-to-DP peer device */ | |
5490 | if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) && | |
5491 | (endpoint_fec & DP_FEC_CAPABLE) && | |
5492 | (upstream_dsc & 0x2) /* DSC passthrough */) | |
5493 | return &port->aux; | |
5494 | ||
5495 | /* Virtual DPCD decompression with DP-to-DP peer device */ | |
5496 | return &immediate_upstream_port->aux; | |
5497 | } | |
5498 | ||
5499 | /* Virtual DPCD decompression with DP-to-HDMI or Virtual DP Sink */ | |
5500 | if (drm_dp_mst_is_virtual_dpcd(port)) | |
5501 | return &port->aux; | |
5502 | ||
5b03f9d8 ML |
5503 | /* |
5504 | * Synaptics quirk | |
5505 | * Applies to ports for which: | |
5506 | * - Physical aux has Synaptics OUI | |
5507 | * - DPv1.4 or higher | |
5508 | * - Port is on primary branch device | |
5509 | * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG) | |
5510 | */ | |
5511 | if (drm_dp_read_desc(port->mgr->aux, &desc, true)) | |
5512 | return NULL; | |
5513 | ||
0883ce81 LP |
5514 | if (drm_dp_has_quirk(&desc, 0, |
5515 | DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) && | |
5b03f9d8 ML |
5516 | port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 && |
5517 | port->parent == port->mgr->mst_primary) { | |
5518 | u8 downstreamport; | |
5519 | ||
5520 | if (drm_dp_dpcd_read(&port->aux, DP_DOWNSTREAMPORT_PRESENT, | |
5521 | &downstreamport, 1) < 0) | |
5522 | return NULL; | |
5523 | ||
5524 | if ((downstreamport & DP_DWN_STRM_PORT_PRESENT) && | |
5525 | ((downstreamport & DP_DWN_STRM_PORT_TYPE_MASK) | |
5526 | != DP_DWN_STRM_PORT_TYPE_ANALOG)) | |
5527 | return port->mgr->aux; | |
5528 | } | |
5529 | ||
c2bc1b6e DF |
5530 | /* |
5531 | * The check below verifies if the MST sink | |
5532 | * connected to the GPU is capable of DSC - | |
5533 | * therefore the endpoint needs to be | |
5534 | * both DSC and FEC capable. | |
5535 | */ | |
5536 | if (drm_dp_dpcd_read(&port->aux, | |
5537 | DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1) | |
5538 | return NULL; | |
5539 | if (drm_dp_dpcd_read(&port->aux, | |
5540 | DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1) | |
5541 | return NULL; | |
5542 | if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) && | |
5543 | (endpoint_fec & DP_FEC_CAPABLE)) | |
5544 | return &port->aux; | |
5545 | ||
5546 | return NULL; | |
5547 | } | |
5548 | EXPORT_SYMBOL(drm_dp_mst_dsc_aux_for_port); |