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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 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/sched.h> | |
75bc08ab | 28 | #include <linux/seq_file.h> |
ad7f8a1f DA |
29 | #include <linux/i2c.h> |
30 | #include <drm/drm_dp_mst_helper.h> | |
31 | #include <drm/drmP.h> | |
32 | ||
33 | #include <drm/drm_fixed.h> | |
a4370c77 VS |
34 | #include <drm/drm_atomic.h> |
35 | #include <drm/drm_atomic_helper.h> | |
ad7f8a1f DA |
36 | |
37 | /** | |
38 | * DOC: dp mst helper | |
39 | * | |
40 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport | |
41 | * protocol. The helpers contain a topology manager and bandwidth manager. | |
42 | * The helpers encapsulate the sending and received of sideband msgs. | |
43 | */ | |
44 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
45 | char *buf); | |
46 | static int test_calc_pbn_mode(void); | |
47 | ||
48 | static void drm_dp_put_port(struct drm_dp_mst_port *port); | |
49 | ||
50 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
51 | int id, | |
52 | struct drm_dp_payload *payload); | |
53 | ||
54 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
55 | struct drm_dp_mst_port *port, | |
56 | int offset, int size, u8 *bytes); | |
57 | ||
68d8c9fc DA |
58 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
59 | struct drm_dp_mst_branch *mstb); | |
ad7f8a1f DA |
60 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
61 | struct drm_dp_mst_branch *mstb, | |
62 | struct drm_dp_mst_port *port); | |
63 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
64 | u8 *guid); | |
65 | ||
66 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); | |
67 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); | |
68 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); | |
69 | /* sideband msg handling */ | |
70 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) | |
71 | { | |
72 | u8 bitmask = 0x80; | |
73 | u8 bitshift = 7; | |
74 | u8 array_index = 0; | |
75 | int number_of_bits = num_nibbles * 4; | |
76 | u8 remainder = 0; | |
77 | ||
78 | while (number_of_bits != 0) { | |
79 | number_of_bits--; | |
80 | remainder <<= 1; | |
81 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
82 | bitmask >>= 1; | |
83 | bitshift--; | |
84 | if (bitmask == 0) { | |
85 | bitmask = 0x80; | |
86 | bitshift = 7; | |
87 | array_index++; | |
88 | } | |
89 | if ((remainder & 0x10) == 0x10) | |
90 | remainder ^= 0x13; | |
91 | } | |
92 | ||
93 | number_of_bits = 4; | |
94 | while (number_of_bits != 0) { | |
95 | number_of_bits--; | |
96 | remainder <<= 1; | |
97 | if ((remainder & 0x10) != 0) | |
98 | remainder ^= 0x13; | |
99 | } | |
100 | ||
101 | return remainder; | |
102 | } | |
103 | ||
104 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) | |
105 | { | |
106 | u8 bitmask = 0x80; | |
107 | u8 bitshift = 7; | |
108 | u8 array_index = 0; | |
109 | int number_of_bits = number_of_bytes * 8; | |
110 | u16 remainder = 0; | |
111 | ||
112 | while (number_of_bits != 0) { | |
113 | number_of_bits--; | |
114 | remainder <<= 1; | |
115 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
116 | bitmask >>= 1; | |
117 | bitshift--; | |
118 | if (bitmask == 0) { | |
119 | bitmask = 0x80; | |
120 | bitshift = 7; | |
121 | array_index++; | |
122 | } | |
123 | if ((remainder & 0x100) == 0x100) | |
124 | remainder ^= 0xd5; | |
125 | } | |
126 | ||
127 | number_of_bits = 8; | |
128 | while (number_of_bits != 0) { | |
129 | number_of_bits--; | |
130 | remainder <<= 1; | |
131 | if ((remainder & 0x100) != 0) | |
132 | remainder ^= 0xd5; | |
133 | } | |
134 | ||
135 | return remainder & 0xff; | |
136 | } | |
137 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) | |
138 | { | |
139 | u8 size = 3; | |
140 | size += (hdr->lct / 2); | |
141 | return size; | |
142 | } | |
143 | ||
144 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
145 | u8 *buf, int *len) | |
146 | { | |
147 | int idx = 0; | |
148 | int i; | |
149 | u8 crc4; | |
150 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); | |
151 | for (i = 0; i < (hdr->lct / 2); i++) | |
152 | buf[idx++] = hdr->rad[i]; | |
153 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | | |
154 | (hdr->msg_len & 0x3f); | |
155 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); | |
156 | ||
157 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); | |
158 | buf[idx - 1] |= (crc4 & 0xf); | |
159 | ||
160 | *len = idx; | |
161 | } | |
162 | ||
163 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
164 | u8 *buf, int buflen, u8 *hdrlen) | |
165 | { | |
166 | u8 crc4; | |
167 | u8 len; | |
168 | int i; | |
169 | u8 idx; | |
170 | if (buf[0] == 0) | |
171 | return false; | |
172 | len = 3; | |
173 | len += ((buf[0] & 0xf0) >> 4) / 2; | |
174 | if (len > buflen) | |
175 | return false; | |
176 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); | |
177 | ||
178 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { | |
179 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); | |
180 | return false; | |
181 | } | |
182 | ||
183 | hdr->lct = (buf[0] & 0xf0) >> 4; | |
184 | hdr->lcr = (buf[0] & 0xf); | |
185 | idx = 1; | |
186 | for (i = 0; i < (hdr->lct / 2); i++) | |
187 | hdr->rad[i] = buf[idx++]; | |
188 | hdr->broadcast = (buf[idx] >> 7) & 0x1; | |
189 | hdr->path_msg = (buf[idx] >> 6) & 0x1; | |
190 | hdr->msg_len = buf[idx] & 0x3f; | |
191 | idx++; | |
192 | hdr->somt = (buf[idx] >> 7) & 0x1; | |
193 | hdr->eomt = (buf[idx] >> 6) & 0x1; | |
194 | hdr->seqno = (buf[idx] >> 4) & 0x1; | |
195 | idx++; | |
196 | *hdrlen = idx; | |
197 | return true; | |
198 | } | |
199 | ||
200 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, | |
201 | struct drm_dp_sideband_msg_tx *raw) | |
202 | { | |
203 | int idx = 0; | |
204 | int i; | |
205 | u8 *buf = raw->msg; | |
206 | buf[idx++] = req->req_type & 0x7f; | |
207 | ||
208 | switch (req->req_type) { | |
209 | case DP_ENUM_PATH_RESOURCES: | |
210 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; | |
211 | idx++; | |
212 | break; | |
213 | case DP_ALLOCATE_PAYLOAD: | |
214 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | | |
215 | (req->u.allocate_payload.number_sdp_streams & 0xf); | |
216 | idx++; | |
217 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); | |
218 | idx++; | |
219 | buf[idx] = (req->u.allocate_payload.pbn >> 8); | |
220 | idx++; | |
221 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); | |
222 | idx++; | |
223 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { | |
224 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | | |
225 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); | |
226 | idx++; | |
227 | } | |
228 | if (req->u.allocate_payload.number_sdp_streams & 1) { | |
229 | i = req->u.allocate_payload.number_sdp_streams - 1; | |
230 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; | |
231 | idx++; | |
232 | } | |
233 | break; | |
234 | case DP_QUERY_PAYLOAD: | |
235 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; | |
236 | idx++; | |
237 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); | |
238 | idx++; | |
239 | break; | |
240 | case DP_REMOTE_DPCD_READ: | |
241 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; | |
242 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; | |
243 | idx++; | |
244 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; | |
245 | idx++; | |
246 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); | |
247 | idx++; | |
248 | buf[idx] = (req->u.dpcd_read.num_bytes); | |
249 | idx++; | |
250 | break; | |
251 | ||
252 | case DP_REMOTE_DPCD_WRITE: | |
253 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; | |
254 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; | |
255 | idx++; | |
256 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; | |
257 | idx++; | |
258 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); | |
259 | idx++; | |
260 | buf[idx] = (req->u.dpcd_write.num_bytes); | |
261 | idx++; | |
262 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); | |
263 | idx += req->u.dpcd_write.num_bytes; | |
264 | break; | |
265 | case DP_REMOTE_I2C_READ: | |
266 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; | |
267 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); | |
268 | idx++; | |
269 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { | |
270 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; | |
271 | idx++; | |
272 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; | |
273 | idx++; | |
274 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); | |
275 | idx += req->u.i2c_read.transactions[i].num_bytes; | |
276 | ||
277 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; | |
278 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); | |
279 | idx++; | |
280 | } | |
281 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; | |
282 | idx++; | |
283 | buf[idx] = (req->u.i2c_read.num_bytes_read); | |
284 | idx++; | |
285 | break; | |
286 | ||
287 | case DP_REMOTE_I2C_WRITE: | |
288 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; | |
289 | idx++; | |
290 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; | |
291 | idx++; | |
292 | buf[idx] = (req->u.i2c_write.num_bytes); | |
293 | idx++; | |
294 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); | |
295 | idx += req->u.i2c_write.num_bytes; | |
296 | break; | |
0bb9c2b2 DP |
297 | |
298 | case DP_POWER_DOWN_PHY: | |
299 | case DP_POWER_UP_PHY: | |
300 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; | |
301 | idx++; | |
302 | break; | |
ad7f8a1f DA |
303 | } |
304 | raw->cur_len = idx; | |
305 | } | |
306 | ||
307 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) | |
308 | { | |
309 | u8 crc4; | |
310 | crc4 = drm_dp_msg_data_crc4(msg, len); | |
311 | msg[len] = crc4; | |
312 | } | |
313 | ||
314 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, | |
315 | struct drm_dp_sideband_msg_tx *raw) | |
316 | { | |
317 | int idx = 0; | |
318 | u8 *buf = raw->msg; | |
319 | ||
320 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); | |
321 | ||
322 | raw->cur_len = idx; | |
323 | } | |
324 | ||
325 | /* this adds a chunk of msg to the builder to get the final msg */ | |
326 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, | |
327 | u8 *replybuf, u8 replybuflen, bool hdr) | |
328 | { | |
329 | int ret; | |
330 | u8 crc4; | |
331 | ||
332 | if (hdr) { | |
333 | u8 hdrlen; | |
334 | struct drm_dp_sideband_msg_hdr recv_hdr; | |
335 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); | |
336 | if (ret == false) { | |
337 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); | |
338 | return false; | |
339 | } | |
340 | ||
636c4c3e ID |
341 | /* |
342 | * ignore out-of-order messages or messages that are part of a | |
343 | * failed transaction | |
344 | */ | |
345 | if (!recv_hdr.somt && !msg->have_somt) | |
346 | return false; | |
347 | ||
ad7f8a1f DA |
348 | /* get length contained in this portion */ |
349 | msg->curchunk_len = recv_hdr.msg_len; | |
350 | msg->curchunk_hdrlen = hdrlen; | |
351 | ||
352 | /* we have already gotten an somt - don't bother parsing */ | |
353 | if (recv_hdr.somt && msg->have_somt) | |
354 | return false; | |
355 | ||
356 | if (recv_hdr.somt) { | |
357 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); | |
358 | msg->have_somt = true; | |
359 | } | |
360 | if (recv_hdr.eomt) | |
361 | msg->have_eomt = true; | |
362 | ||
363 | /* copy the bytes for the remainder of this header chunk */ | |
364 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); | |
365 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); | |
366 | } else { | |
367 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); | |
368 | msg->curchunk_idx += replybuflen; | |
369 | } | |
370 | ||
371 | if (msg->curchunk_idx >= msg->curchunk_len) { | |
372 | /* do CRC */ | |
373 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); | |
374 | /* copy chunk into bigger msg */ | |
375 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); | |
376 | msg->curlen += msg->curchunk_len - 1; | |
377 | } | |
378 | return true; | |
379 | } | |
380 | ||
381 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, | |
382 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
383 | { | |
384 | int idx = 1; | |
385 | int i; | |
386 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); | |
387 | idx += 16; | |
388 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; | |
389 | idx++; | |
390 | if (idx > raw->curlen) | |
391 | goto fail_len; | |
392 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { | |
393 | if (raw->msg[idx] & 0x80) | |
394 | repmsg->u.link_addr.ports[i].input_port = 1; | |
395 | ||
396 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; | |
397 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); | |
398 | ||
399 | idx++; | |
400 | if (idx > raw->curlen) | |
401 | goto fail_len; | |
402 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; | |
403 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; | |
404 | if (repmsg->u.link_addr.ports[i].input_port == 0) | |
405 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
406 | idx++; | |
407 | if (idx > raw->curlen) | |
408 | goto fail_len; | |
409 | if (repmsg->u.link_addr.ports[i].input_port == 0) { | |
410 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); | |
411 | idx++; | |
412 | if (idx > raw->curlen) | |
413 | goto fail_len; | |
414 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); | |
415 | idx += 16; | |
416 | if (idx > raw->curlen) | |
417 | goto fail_len; | |
418 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; | |
419 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); | |
420 | idx++; | |
421 | ||
422 | } | |
423 | if (idx > raw->curlen) | |
424 | goto fail_len; | |
425 | } | |
426 | ||
427 | return true; | |
428 | fail_len: | |
429 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
430 | return false; | |
431 | } | |
432 | ||
433 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, | |
434 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
435 | { | |
436 | int idx = 1; | |
437 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; | |
438 | idx++; | |
439 | if (idx > raw->curlen) | |
440 | goto fail_len; | |
441 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; | |
442 | if (idx > raw->curlen) | |
443 | goto fail_len; | |
444 | ||
445 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); | |
446 | return true; | |
447 | fail_len: | |
448 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
449 | return false; | |
450 | } | |
451 | ||
452 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, | |
453 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
454 | { | |
455 | int idx = 1; | |
456 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; | |
457 | idx++; | |
458 | if (idx > raw->curlen) | |
459 | goto fail_len; | |
460 | return true; | |
461 | fail_len: | |
462 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); | |
463 | return false; | |
464 | } | |
465 | ||
466 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, | |
467 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
468 | { | |
469 | int idx = 1; | |
470 | ||
471 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); | |
472 | idx++; | |
473 | if (idx > raw->curlen) | |
474 | goto fail_len; | |
475 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; | |
476 | idx++; | |
477 | /* TODO check */ | |
478 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); | |
479 | return true; | |
480 | fail_len: | |
481 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); | |
482 | return false; | |
483 | } | |
484 | ||
485 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, | |
486 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
487 | { | |
488 | int idx = 1; | |
489 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; | |
490 | idx++; | |
491 | if (idx > raw->curlen) | |
492 | goto fail_len; | |
493 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
494 | idx += 2; | |
495 | if (idx > raw->curlen) | |
496 | goto fail_len; | |
497 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
498 | idx += 2; | |
499 | if (idx > raw->curlen) | |
500 | goto fail_len; | |
501 | return true; | |
502 | fail_len: | |
503 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); | |
504 | return false; | |
505 | } | |
506 | ||
507 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
508 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
509 | { | |
510 | int idx = 1; | |
511 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
512 | idx++; | |
513 | if (idx > raw->curlen) | |
514 | goto fail_len; | |
515 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; | |
516 | idx++; | |
517 | if (idx > raw->curlen) | |
518 | goto fail_len; | |
519 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
520 | idx += 2; | |
521 | if (idx > raw->curlen) | |
522 | goto fail_len; | |
523 | return true; | |
524 | fail_len: | |
525 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); | |
526 | return false; | |
527 | } | |
528 | ||
529 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
530 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
531 | { | |
532 | int idx = 1; | |
533 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
534 | idx++; | |
535 | if (idx > raw->curlen) | |
536 | goto fail_len; | |
537 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
538 | idx += 2; | |
539 | if (idx > raw->curlen) | |
540 | goto fail_len; | |
541 | return true; | |
542 | fail_len: | |
543 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); | |
544 | return false; | |
545 | } | |
546 | ||
0bb9c2b2 DP |
547 | static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, |
548 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
549 | { | |
550 | int idx = 1; | |
551 | ||
552 | repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; | |
553 | idx++; | |
554 | if (idx > raw->curlen) { | |
555 | DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n", | |
556 | idx, raw->curlen); | |
557 | return false; | |
558 | } | |
559 | return true; | |
560 | } | |
561 | ||
ad7f8a1f DA |
562 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
563 | struct drm_dp_sideband_msg_reply_body *msg) | |
564 | { | |
565 | memset(msg, 0, sizeof(*msg)); | |
566 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; | |
567 | msg->req_type = (raw->msg[0] & 0x7f); | |
568 | ||
569 | if (msg->reply_type) { | |
570 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); | |
571 | msg->u.nak.reason = raw->msg[17]; | |
572 | msg->u.nak.nak_data = raw->msg[18]; | |
573 | return false; | |
574 | } | |
575 | ||
576 | switch (msg->req_type) { | |
577 | case DP_LINK_ADDRESS: | |
578 | return drm_dp_sideband_parse_link_address(raw, msg); | |
579 | case DP_QUERY_PAYLOAD: | |
580 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); | |
581 | case DP_REMOTE_DPCD_READ: | |
582 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); | |
583 | case DP_REMOTE_DPCD_WRITE: | |
584 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); | |
585 | case DP_REMOTE_I2C_READ: | |
586 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); | |
587 | case DP_ENUM_PATH_RESOURCES: | |
588 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); | |
589 | case DP_ALLOCATE_PAYLOAD: | |
590 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); | |
0bb9c2b2 DP |
591 | case DP_POWER_DOWN_PHY: |
592 | case DP_POWER_UP_PHY: | |
593 | return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); | |
ad7f8a1f DA |
594 | default: |
595 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); | |
596 | return false; | |
597 | } | |
598 | } | |
599 | ||
600 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
601 | struct drm_dp_sideband_msg_req_body *msg) | |
602 | { | |
603 | int idx = 1; | |
604 | ||
605 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
606 | idx++; | |
607 | if (idx > raw->curlen) | |
608 | goto fail_len; | |
609 | ||
610 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); | |
611 | idx += 16; | |
612 | if (idx > raw->curlen) | |
613 | goto fail_len; | |
614 | ||
615 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; | |
616 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
617 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; | |
618 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; | |
619 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); | |
620 | idx++; | |
621 | return true; | |
622 | fail_len: | |
623 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); | |
624 | return false; | |
625 | } | |
626 | ||
627 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
628 | struct drm_dp_sideband_msg_req_body *msg) | |
629 | { | |
630 | int idx = 1; | |
631 | ||
632 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
633 | idx++; | |
634 | if (idx > raw->curlen) | |
635 | goto fail_len; | |
636 | ||
637 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); | |
638 | idx += 16; | |
639 | if (idx > raw->curlen) | |
640 | goto fail_len; | |
641 | ||
642 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
643 | idx++; | |
644 | return true; | |
645 | fail_len: | |
646 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); | |
647 | return false; | |
648 | } | |
649 | ||
650 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, | |
651 | struct drm_dp_sideband_msg_req_body *msg) | |
652 | { | |
653 | memset(msg, 0, sizeof(*msg)); | |
654 | msg->req_type = (raw->msg[0] & 0x7f); | |
655 | ||
656 | switch (msg->req_type) { | |
657 | case DP_CONNECTION_STATUS_NOTIFY: | |
658 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); | |
659 | case DP_RESOURCE_STATUS_NOTIFY: | |
660 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); | |
661 | default: | |
662 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); | |
663 | return false; | |
664 | } | |
665 | } | |
666 | ||
667 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) | |
668 | { | |
669 | struct drm_dp_sideband_msg_req_body req; | |
670 | ||
671 | req.req_type = DP_REMOTE_DPCD_WRITE; | |
672 | req.u.dpcd_write.port_number = port_num; | |
673 | req.u.dpcd_write.dpcd_address = offset; | |
674 | req.u.dpcd_write.num_bytes = num_bytes; | |
675 | req.u.dpcd_write.bytes = bytes; | |
676 | drm_dp_encode_sideband_req(&req, msg); | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) | |
682 | { | |
683 | struct drm_dp_sideband_msg_req_body req; | |
684 | ||
685 | req.req_type = DP_LINK_ADDRESS; | |
686 | drm_dp_encode_sideband_req(&req, msg); | |
687 | return 0; | |
688 | } | |
689 | ||
690 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) | |
691 | { | |
692 | struct drm_dp_sideband_msg_req_body req; | |
693 | ||
694 | req.req_type = DP_ENUM_PATH_RESOURCES; | |
695 | req.u.port_num.port_number = port_num; | |
696 | drm_dp_encode_sideband_req(&req, msg); | |
697 | msg->path_msg = true; | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, | |
ef8f9bea LY |
702 | u8 vcpi, uint16_t pbn, |
703 | u8 number_sdp_streams, | |
704 | u8 *sdp_stream_sink) | |
ad7f8a1f DA |
705 | { |
706 | struct drm_dp_sideband_msg_req_body req; | |
707 | memset(&req, 0, sizeof(req)); | |
708 | req.req_type = DP_ALLOCATE_PAYLOAD; | |
709 | req.u.allocate_payload.port_number = port_num; | |
710 | req.u.allocate_payload.vcpi = vcpi; | |
711 | req.u.allocate_payload.pbn = pbn; | |
ef8f9bea LY |
712 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
713 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, | |
714 | number_sdp_streams); | |
ad7f8a1f DA |
715 | drm_dp_encode_sideband_req(&req, msg); |
716 | msg->path_msg = true; | |
717 | return 0; | |
718 | } | |
719 | ||
0bb9c2b2 DP |
720 | static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, |
721 | int port_num, bool power_up) | |
722 | { | |
723 | struct drm_dp_sideband_msg_req_body req; | |
724 | ||
725 | if (power_up) | |
726 | req.req_type = DP_POWER_UP_PHY; | |
727 | else | |
728 | req.req_type = DP_POWER_DOWN_PHY; | |
729 | ||
730 | req.u.port_num.port_number = port_num; | |
731 | drm_dp_encode_sideband_req(&req, msg); | |
732 | msg->path_msg = true; | |
733 | return 0; | |
734 | } | |
735 | ||
ad7f8a1f DA |
736 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
737 | struct drm_dp_vcpi *vcpi) | |
738 | { | |
dfda0df3 | 739 | int ret, vcpi_ret; |
ad7f8a1f DA |
740 | |
741 | mutex_lock(&mgr->payload_lock); | |
742 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); | |
743 | if (ret > mgr->max_payloads) { | |
744 | ret = -EINVAL; | |
745 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); | |
746 | goto out_unlock; | |
747 | } | |
748 | ||
dfda0df3 DA |
749 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
750 | if (vcpi_ret > mgr->max_payloads) { | |
751 | ret = -EINVAL; | |
752 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); | |
753 | goto out_unlock; | |
754 | } | |
755 | ||
ad7f8a1f | 756 | set_bit(ret, &mgr->payload_mask); |
dfda0df3 DA |
757 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
758 | vcpi->vcpi = vcpi_ret + 1; | |
ad7f8a1f DA |
759 | mgr->proposed_vcpis[ret - 1] = vcpi; |
760 | out_unlock: | |
761 | mutex_unlock(&mgr->payload_lock); | |
762 | return ret; | |
763 | } | |
764 | ||
765 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
dfda0df3 | 766 | int vcpi) |
ad7f8a1f | 767 | { |
dfda0df3 DA |
768 | int i; |
769 | if (vcpi == 0) | |
ad7f8a1f DA |
770 | return; |
771 | ||
772 | mutex_lock(&mgr->payload_lock); | |
dfda0df3 DA |
773 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
774 | clear_bit(vcpi - 1, &mgr->vcpi_mask); | |
775 | ||
776 | for (i = 0; i < mgr->max_payloads; i++) { | |
777 | if (mgr->proposed_vcpis[i]) | |
778 | if (mgr->proposed_vcpis[i]->vcpi == vcpi) { | |
779 | mgr->proposed_vcpis[i] = NULL; | |
780 | clear_bit(i + 1, &mgr->payload_mask); | |
781 | } | |
782 | } | |
ad7f8a1f DA |
783 | mutex_unlock(&mgr->payload_lock); |
784 | } | |
785 | ||
786 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, | |
787 | struct drm_dp_sideband_msg_tx *txmsg) | |
788 | { | |
992d38cc | 789 | unsigned int state; |
cd961bb9 DV |
790 | |
791 | /* | |
792 | * All updates to txmsg->state are protected by mgr->qlock, and the two | |
793 | * cases we check here are terminal states. For those the barriers | |
794 | * provided by the wake_up/wait_event pair are enough. | |
795 | */ | |
992d38cc CW |
796 | state = READ_ONCE(txmsg->state); |
797 | return (state == DRM_DP_SIDEBAND_TX_RX || | |
798 | state == DRM_DP_SIDEBAND_TX_TIMEOUT); | |
ad7f8a1f DA |
799 | } |
800 | ||
801 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, | |
802 | struct drm_dp_sideband_msg_tx *txmsg) | |
803 | { | |
804 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
805 | int ret; | |
806 | ||
807 | ret = wait_event_timeout(mgr->tx_waitq, | |
808 | check_txmsg_state(mgr, txmsg), | |
809 | (4 * HZ)); | |
810 | mutex_lock(&mstb->mgr->qlock); | |
811 | if (ret > 0) { | |
812 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { | |
813 | ret = -EIO; | |
814 | goto out; | |
815 | } | |
816 | } else { | |
817 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); | |
818 | ||
819 | /* dump some state */ | |
820 | ret = -EIO; | |
821 | ||
822 | /* remove from q */ | |
823 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || | |
824 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { | |
825 | list_del(&txmsg->next); | |
826 | } | |
827 | ||
828 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || | |
829 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { | |
830 | mstb->tx_slots[txmsg->seqno] = NULL; | |
831 | } | |
832 | } | |
833 | out: | |
834 | mutex_unlock(&mgr->qlock); | |
835 | ||
836 | return ret; | |
837 | } | |
838 | ||
839 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) | |
840 | { | |
841 | struct drm_dp_mst_branch *mstb; | |
842 | ||
843 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); | |
844 | if (!mstb) | |
845 | return NULL; | |
846 | ||
847 | mstb->lct = lct; | |
848 | if (lct > 1) | |
849 | memcpy(mstb->rad, rad, lct / 2); | |
850 | INIT_LIST_HEAD(&mstb->ports); | |
851 | kref_init(&mstb->kref); | |
852 | return mstb; | |
853 | } | |
854 | ||
91a25e46 ML |
855 | static void drm_dp_free_mst_port(struct kref *kref); |
856 | ||
857 | static void drm_dp_free_mst_branch_device(struct kref *kref) | |
858 | { | |
859 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); | |
860 | if (mstb->port_parent) { | |
861 | if (list_empty(&mstb->port_parent->next)) | |
862 | kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); | |
863 | } | |
864 | kfree(mstb); | |
865 | } | |
866 | ||
ad7f8a1f DA |
867 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
868 | { | |
869 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); | |
870 | struct drm_dp_mst_port *port, *tmp; | |
871 | bool wake_tx = false; | |
872 | ||
91a25e46 ML |
873 | /* |
874 | * init kref again to be used by ports to remove mst branch when it is | |
875 | * not needed anymore | |
876 | */ | |
877 | kref_init(kref); | |
878 | ||
879 | if (mstb->port_parent && list_empty(&mstb->port_parent->next)) | |
880 | kref_get(&mstb->port_parent->kref); | |
881 | ||
ad7f8a1f DA |
882 | /* |
883 | * destroy all ports - don't need lock | |
884 | * as there are no more references to the mst branch | |
885 | * device at this point. | |
886 | */ | |
887 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { | |
888 | list_del(&port->next); | |
889 | drm_dp_put_port(port); | |
890 | } | |
891 | ||
892 | /* drop any tx slots msg */ | |
893 | mutex_lock(&mstb->mgr->qlock); | |
894 | if (mstb->tx_slots[0]) { | |
895 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
896 | mstb->tx_slots[0] = NULL; | |
897 | wake_tx = true; | |
898 | } | |
899 | if (mstb->tx_slots[1]) { | |
900 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
901 | mstb->tx_slots[1] = NULL; | |
902 | wake_tx = true; | |
903 | } | |
904 | mutex_unlock(&mstb->mgr->qlock); | |
905 | ||
906 | if (wake_tx) | |
68e989dc | 907 | wake_up_all(&mstb->mgr->tx_waitq); |
91a25e46 ML |
908 | |
909 | kref_put(kref, drm_dp_free_mst_branch_device); | |
ad7f8a1f DA |
910 | } |
911 | ||
912 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) | |
913 | { | |
914 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); | |
915 | } | |
916 | ||
917 | ||
918 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) | |
919 | { | |
0391359d DV |
920 | struct drm_dp_mst_branch *mstb; |
921 | ||
ad7f8a1f DA |
922 | switch (old_pdt) { |
923 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
924 | case DP_PEER_DEVICE_SST_SINK: | |
925 | /* remove i2c over sideband */ | |
926 | drm_dp_mst_unregister_i2c_bus(&port->aux); | |
927 | break; | |
928 | case DP_PEER_DEVICE_MST_BRANCHING: | |
0391359d | 929 | mstb = port->mstb; |
ad7f8a1f | 930 | port->mstb = NULL; |
0391359d | 931 | drm_dp_put_mst_branch_device(mstb); |
ad7f8a1f DA |
932 | break; |
933 | } | |
934 | } | |
935 | ||
936 | static void drm_dp_destroy_port(struct kref *kref) | |
937 | { | |
938 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); | |
939 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
df4839fd | 940 | |
ad7f8a1f DA |
941 | if (!port->input) { |
942 | port->vcpi.num_slots = 0; | |
c6a0aed4 DA |
943 | |
944 | kfree(port->cached_edid); | |
6b8eeca6 | 945 | |
df4839fd DA |
946 | /* |
947 | * The only time we don't have a connector | |
948 | * on an output port is if the connector init | |
949 | * fails. | |
950 | */ | |
6b8eeca6 | 951 | if (port->connector) { |
df4839fd DA |
952 | /* we can't destroy the connector here, as |
953 | * we might be holding the mode_config.mutex | |
954 | * from an EDID retrieval */ | |
955 | ||
6b8eeca6 | 956 | mutex_lock(&mgr->destroy_connector_lock); |
91a25e46 | 957 | kref_get(&port->parent->kref); |
4772ff03 | 958 | list_add(&port->next, &mgr->destroy_connector_list); |
6b8eeca6 DA |
959 | mutex_unlock(&mgr->destroy_connector_lock); |
960 | schedule_work(&mgr->destroy_connector_work); | |
4772ff03 | 961 | return; |
6b8eeca6 | 962 | } |
df4839fd DA |
963 | /* no need to clean up vcpi |
964 | * as if we have no connector we never setup a vcpi */ | |
ad7f8a1f | 965 | drm_dp_port_teardown_pdt(port, port->pdt); |
36e3fa6a | 966 | port->pdt = DP_PEER_DEVICE_NONE; |
ad7f8a1f DA |
967 | } |
968 | kfree(port); | |
ad7f8a1f DA |
969 | } |
970 | ||
971 | static void drm_dp_put_port(struct drm_dp_mst_port *port) | |
972 | { | |
973 | kref_put(&port->kref, drm_dp_destroy_port); | |
974 | } | |
975 | ||
976 | static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find) | |
977 | { | |
978 | struct drm_dp_mst_port *port; | |
979 | struct drm_dp_mst_branch *rmstb; | |
980 | if (to_find == mstb) { | |
981 | kref_get(&mstb->kref); | |
982 | return mstb; | |
983 | } | |
984 | list_for_each_entry(port, &mstb->ports, next) { | |
985 | if (port->mstb) { | |
986 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); | |
987 | if (rmstb) | |
988 | return rmstb; | |
989 | } | |
990 | } | |
991 | return NULL; | |
992 | } | |
993 | ||
994 | static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) | |
995 | { | |
996 | struct drm_dp_mst_branch *rmstb = NULL; | |
997 | mutex_lock(&mgr->lock); | |
998 | if (mgr->mst_primary) | |
999 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); | |
1000 | mutex_unlock(&mgr->lock); | |
1001 | return rmstb; | |
1002 | } | |
1003 | ||
1004 | static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) | |
1005 | { | |
1006 | struct drm_dp_mst_port *port, *mport; | |
1007 | ||
1008 | list_for_each_entry(port, &mstb->ports, next) { | |
1009 | if (port == to_find) { | |
1010 | kref_get(&port->kref); | |
1011 | return port; | |
1012 | } | |
1013 | if (port->mstb) { | |
1014 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); | |
1015 | if (mport) | |
1016 | return mport; | |
1017 | } | |
1018 | } | |
1019 | return NULL; | |
1020 | } | |
1021 | ||
1022 | static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
1023 | { | |
1024 | struct drm_dp_mst_port *rport = NULL; | |
1025 | mutex_lock(&mgr->lock); | |
1026 | if (mgr->mst_primary) | |
1027 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); | |
1028 | mutex_unlock(&mgr->lock); | |
1029 | return rport; | |
1030 | } | |
1031 | ||
1032 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) | |
1033 | { | |
1034 | struct drm_dp_mst_port *port; | |
1035 | ||
1036 | list_for_each_entry(port, &mstb->ports, next) { | |
1037 | if (port->port_num == port_num) { | |
1038 | kref_get(&port->kref); | |
1039 | return port; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | return NULL; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * calculate a new RAD for this MST branch device | |
1048 | * if parent has an LCT of 2 then it has 1 nibble of RAD, | |
1049 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, | |
1050 | */ | |
1051 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, | |
1052 | u8 *rad) | |
1053 | { | |
75af4c8c | 1054 | int parent_lct = port->parent->lct; |
ad7f8a1f | 1055 | int shift = 4; |
75af4c8c ML |
1056 | int idx = (parent_lct - 1) / 2; |
1057 | if (parent_lct > 1) { | |
1058 | memcpy(rad, port->parent->rad, idx + 1); | |
1059 | shift = (parent_lct % 2) ? 4 : 0; | |
ad7f8a1f DA |
1060 | } else |
1061 | rad[0] = 0; | |
1062 | ||
1063 | rad[idx] |= port->port_num << shift; | |
75af4c8c | 1064 | return parent_lct + 1; |
ad7f8a1f DA |
1065 | } |
1066 | ||
1067 | /* | |
1068 | * return sends link address for new mstb | |
1069 | */ | |
1070 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) | |
1071 | { | |
1072 | int ret; | |
1073 | u8 rad[6], lct; | |
1074 | bool send_link = false; | |
1075 | switch (port->pdt) { | |
1076 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
1077 | case DP_PEER_DEVICE_SST_SINK: | |
1078 | /* add i2c over sideband */ | |
1079 | ret = drm_dp_mst_register_i2c_bus(&port->aux); | |
1080 | break; | |
1081 | case DP_PEER_DEVICE_MST_BRANCHING: | |
1082 | lct = drm_dp_calculate_rad(port, rad); | |
1083 | ||
1084 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); | |
1085 | port->mstb->mgr = port->mgr; | |
1086 | port->mstb->port_parent = port; | |
1087 | ||
1088 | send_link = true; | |
1089 | break; | |
1090 | } | |
1091 | return send_link; | |
1092 | } | |
1093 | ||
5e93b820 | 1094 | static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
ad7f8a1f DA |
1095 | { |
1096 | int ret; | |
5e93b820 HW |
1097 | |
1098 | memcpy(mstb->guid, guid, 16); | |
1099 | ||
1100 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { | |
1101 | if (mstb->port_parent) { | |
1102 | ret = drm_dp_send_dpcd_write( | |
1103 | mstb->mgr, | |
1104 | mstb->port_parent, | |
1105 | DP_GUID, | |
1106 | 16, | |
1107 | mstb->guid); | |
1108 | } else { | |
1109 | ||
1110 | ret = drm_dp_dpcd_write( | |
1111 | mstb->mgr->aux, | |
1112 | DP_GUID, | |
1113 | mstb->guid, | |
1114 | 16); | |
ad7f8a1f DA |
1115 | } |
1116 | } | |
1117 | } | |
1118 | ||
1c960876 DA |
1119 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
1120 | int pnum, | |
d87af4d1 RS |
1121 | char *proppath, |
1122 | size_t proppath_size) | |
ad7f8a1f DA |
1123 | { |
1124 | int i; | |
1125 | char temp[8]; | |
d87af4d1 | 1126 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
ad7f8a1f DA |
1127 | for (i = 0; i < (mstb->lct - 1); i++) { |
1128 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 1129 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
d87af4d1 RS |
1130 | snprintf(temp, sizeof(temp), "-%d", port_num); |
1131 | strlcat(proppath, temp, proppath_size); | |
ad7f8a1f | 1132 | } |
1c960876 | 1133 | snprintf(temp, sizeof(temp), "-%d", pnum); |
d87af4d1 | 1134 | strlcat(proppath, temp, proppath_size); |
ad7f8a1f DA |
1135 | } |
1136 | ||
1137 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, | |
7b0a89a6 | 1138 | struct drm_device *dev, |
ad7f8a1f DA |
1139 | struct drm_dp_link_addr_reply_port *port_msg) |
1140 | { | |
1141 | struct drm_dp_mst_port *port; | |
1142 | bool ret; | |
1143 | bool created = false; | |
1144 | int old_pdt = 0; | |
1145 | int old_ddps = 0; | |
1146 | port = drm_dp_get_port(mstb, port_msg->port_number); | |
1147 | if (!port) { | |
1148 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
1149 | if (!port) | |
1150 | return; | |
1151 | kref_init(&port->kref); | |
1152 | port->parent = mstb; | |
1153 | port->port_num = port_msg->port_number; | |
1154 | port->mgr = mstb->mgr; | |
1155 | port->aux.name = "DPMST"; | |
7b0a89a6 | 1156 | port->aux.dev = dev->dev; |
ad7f8a1f DA |
1157 | created = true; |
1158 | } else { | |
1159 | old_pdt = port->pdt; | |
1160 | old_ddps = port->ddps; | |
1161 | } | |
1162 | ||
1163 | port->pdt = port_msg->peer_device_type; | |
1164 | port->input = port_msg->input_port; | |
1165 | port->mcs = port_msg->mcs; | |
1166 | port->ddps = port_msg->ddps; | |
1167 | port->ldps = port_msg->legacy_device_plug_status; | |
1168 | port->dpcd_rev = port_msg->dpcd_revision; | |
1169 | port->num_sdp_streams = port_msg->num_sdp_streams; | |
1170 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; | |
ad7f8a1f DA |
1171 | |
1172 | /* manage mstb port lists with mgr lock - take a reference | |
1173 | for this list */ | |
1174 | if (created) { | |
1175 | mutex_lock(&mstb->mgr->lock); | |
1176 | kref_get(&port->kref); | |
1177 | list_add(&port->next, &mstb->ports); | |
1178 | mutex_unlock(&mstb->mgr->lock); | |
1179 | } | |
1180 | ||
1181 | if (old_ddps != port->ddps) { | |
1182 | if (port->ddps) { | |
ad7f8a1f DA |
1183 | if (!port->input) |
1184 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); | |
1185 | } else { | |
ad7f8a1f DA |
1186 | port->available_pbn = 0; |
1187 | } | |
1188 | } | |
1189 | ||
1190 | if (old_pdt != port->pdt && !port->input) { | |
1191 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1192 | ||
1193 | ret = drm_dp_port_setup_pdt(port); | |
68d8c9fc | 1194 | if (ret == true) |
ad7f8a1f | 1195 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
ad7f8a1f DA |
1196 | } |
1197 | ||
1198 | if (created && !port->input) { | |
1199 | char proppath[255]; | |
1c960876 DA |
1200 | |
1201 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); | |
ad7f8a1f | 1202 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); |
df4839fd DA |
1203 | if (!port->connector) { |
1204 | /* remove it from the port list */ | |
1205 | mutex_lock(&mstb->mgr->lock); | |
1206 | list_del(&port->next); | |
1207 | mutex_unlock(&mstb->mgr->lock); | |
1208 | /* drop port list reference */ | |
1209 | drm_dp_put_port(port); | |
1210 | goto out; | |
1211 | } | |
4da5caa6 VS |
1212 | if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || |
1213 | port->pdt == DP_PEER_DEVICE_SST_SINK) && | |
1214 | port->port_num >= DP_MST_LOGICAL_PORT_0) { | |
8ae22cb4 DA |
1215 | port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); |
1216 | drm_mode_connector_set_tile_property(port->connector); | |
1217 | } | |
d9515c5e | 1218 | (*mstb->mgr->cbs->register_connector)(port->connector); |
ad7f8a1f | 1219 | } |
8ae22cb4 | 1220 | |
df4839fd | 1221 | out: |
ad7f8a1f DA |
1222 | /* put reference to this port */ |
1223 | drm_dp_put_port(port); | |
1224 | } | |
1225 | ||
1226 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, | |
1227 | struct drm_dp_connection_status_notify *conn_stat) | |
1228 | { | |
1229 | struct drm_dp_mst_port *port; | |
1230 | int old_pdt; | |
1231 | int old_ddps; | |
1232 | bool dowork = false; | |
1233 | port = drm_dp_get_port(mstb, conn_stat->port_number); | |
1234 | if (!port) | |
1235 | return; | |
1236 | ||
1237 | old_ddps = port->ddps; | |
1238 | old_pdt = port->pdt; | |
1239 | port->pdt = conn_stat->peer_device_type; | |
1240 | port->mcs = conn_stat->message_capability_status; | |
1241 | port->ldps = conn_stat->legacy_device_plug_status; | |
1242 | port->ddps = conn_stat->displayport_device_plug_status; | |
1243 | ||
1244 | if (old_ddps != port->ddps) { | |
1245 | if (port->ddps) { | |
8ae22cb4 | 1246 | dowork = true; |
ad7f8a1f | 1247 | } else { |
ad7f8a1f DA |
1248 | port->available_pbn = 0; |
1249 | } | |
1250 | } | |
1251 | if (old_pdt != port->pdt && !port->input) { | |
1252 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1253 | ||
1254 | if (drm_dp_port_setup_pdt(port)) | |
1255 | dowork = true; | |
1256 | } | |
1257 | ||
1258 | drm_dp_put_port(port); | |
1259 | if (dowork) | |
1260 | queue_work(system_long_wq, &mstb->mgr->work); | |
1261 | ||
1262 | } | |
1263 | ||
1264 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, | |
1265 | u8 lct, u8 *rad) | |
1266 | { | |
1267 | struct drm_dp_mst_branch *mstb; | |
1268 | struct drm_dp_mst_port *port; | |
1269 | int i; | |
1270 | /* find the port by iterating down */ | |
9eb1e57f DA |
1271 | |
1272 | mutex_lock(&mgr->lock); | |
ad7f8a1f DA |
1273 | mstb = mgr->mst_primary; |
1274 | ||
1275 | for (i = 0; i < lct - 1; i++) { | |
1276 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 1277 | int port_num = (rad[i / 2] >> shift) & 0xf; |
ad7f8a1f DA |
1278 | |
1279 | list_for_each_entry(port, &mstb->ports, next) { | |
1280 | if (port->port_num == port_num) { | |
30730c7f AR |
1281 | mstb = port->mstb; |
1282 | if (!mstb) { | |
ad7f8a1f | 1283 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
30730c7f | 1284 | goto out; |
ad7f8a1f DA |
1285 | } |
1286 | ||
ad7f8a1f DA |
1287 | break; |
1288 | } | |
1289 | } | |
1290 | } | |
1291 | kref_get(&mstb->kref); | |
30730c7f | 1292 | out: |
9eb1e57f | 1293 | mutex_unlock(&mgr->lock); |
ad7f8a1f DA |
1294 | return mstb; |
1295 | } | |
1296 | ||
bd934320 ML |
1297 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
1298 | struct drm_dp_mst_branch *mstb, | |
1299 | uint8_t *guid) | |
1300 | { | |
1301 | struct drm_dp_mst_branch *found_mstb; | |
1302 | struct drm_dp_mst_port *port; | |
1303 | ||
5e93b820 HW |
1304 | if (memcmp(mstb->guid, guid, 16) == 0) |
1305 | return mstb; | |
1306 | ||
1307 | ||
bd934320 ML |
1308 | list_for_each_entry(port, &mstb->ports, next) { |
1309 | if (!port->mstb) | |
1310 | continue; | |
1311 | ||
bd934320 ML |
1312 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
1313 | ||
1314 | if (found_mstb) | |
1315 | return found_mstb; | |
1316 | } | |
1317 | ||
1318 | return NULL; | |
1319 | } | |
1320 | ||
1321 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( | |
1322 | struct drm_dp_mst_topology_mgr *mgr, | |
1323 | uint8_t *guid) | |
1324 | { | |
1325 | struct drm_dp_mst_branch *mstb; | |
1326 | ||
1327 | /* find the port by iterating down */ | |
1328 | mutex_lock(&mgr->lock); | |
1329 | ||
5e93b820 | 1330 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
bd934320 ML |
1331 | |
1332 | if (mstb) | |
1333 | kref_get(&mstb->kref); | |
1334 | ||
1335 | mutex_unlock(&mgr->lock); | |
1336 | return mstb; | |
1337 | } | |
1338 | ||
ad7f8a1f DA |
1339 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1340 | struct drm_dp_mst_branch *mstb) | |
1341 | { | |
1342 | struct drm_dp_mst_port *port; | |
9254ec49 | 1343 | struct drm_dp_mst_branch *mstb_child; |
68d8c9fc | 1344 | if (!mstb->link_address_sent) |
ad7f8a1f | 1345 | drm_dp_send_link_address(mgr, mstb); |
68d8c9fc | 1346 | |
ad7f8a1f DA |
1347 | list_for_each_entry(port, &mstb->ports, next) { |
1348 | if (port->input) | |
1349 | continue; | |
1350 | ||
8ae22cb4 | 1351 | if (!port->ddps) |
ad7f8a1f DA |
1352 | continue; |
1353 | ||
1354 | if (!port->available_pbn) | |
1355 | drm_dp_send_enum_path_resources(mgr, mstb, port); | |
1356 | ||
9254ec49 DV |
1357 | if (port->mstb) { |
1358 | mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); | |
1359 | if (mstb_child) { | |
1360 | drm_dp_check_and_send_link_address(mgr, mstb_child); | |
1361 | drm_dp_put_mst_branch_device(mstb_child); | |
1362 | } | |
1363 | } | |
ad7f8a1f DA |
1364 | } |
1365 | } | |
1366 | ||
1367 | static void drm_dp_mst_link_probe_work(struct work_struct *work) | |
1368 | { | |
1369 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); | |
9254ec49 | 1370 | struct drm_dp_mst_branch *mstb; |
ad7f8a1f | 1371 | |
9254ec49 DV |
1372 | mutex_lock(&mgr->lock); |
1373 | mstb = mgr->mst_primary; | |
1374 | if (mstb) { | |
1375 | kref_get(&mstb->kref); | |
1376 | } | |
1377 | mutex_unlock(&mgr->lock); | |
1378 | if (mstb) { | |
1379 | drm_dp_check_and_send_link_address(mgr, mstb); | |
1380 | drm_dp_put_mst_branch_device(mstb); | |
1381 | } | |
ad7f8a1f DA |
1382 | } |
1383 | ||
1384 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
1385 | u8 *guid) | |
1386 | { | |
e38e1289 | 1387 | u64 salt; |
ad7f8a1f | 1388 | |
e38e1289 VS |
1389 | if (memchr_inv(guid, 0, 16)) |
1390 | return true; | |
1391 | ||
1392 | salt = get_jiffies_64(); | |
1393 | ||
1394 | memcpy(&guid[0], &salt, sizeof(u64)); | |
1395 | memcpy(&guid[8], &salt, sizeof(u64)); | |
1396 | ||
1397 | return false; | |
ad7f8a1f DA |
1398 | } |
1399 | ||
1400 | #if 0 | |
1401 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) | |
1402 | { | |
1403 | struct drm_dp_sideband_msg_req_body req; | |
1404 | ||
1405 | req.req_type = DP_REMOTE_DPCD_READ; | |
1406 | req.u.dpcd_read.port_number = port_num; | |
1407 | req.u.dpcd_read.dpcd_address = offset; | |
1408 | req.u.dpcd_read.num_bytes = num_bytes; | |
1409 | drm_dp_encode_sideband_req(&req, msg); | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | #endif | |
1414 | ||
1415 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, | |
1416 | bool up, u8 *msg, int len) | |
1417 | { | |
1418 | int ret; | |
1419 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; | |
1420 | int tosend, total, offset; | |
1421 | int retries = 0; | |
1422 | ||
1423 | retry: | |
1424 | total = len; | |
1425 | offset = 0; | |
1426 | do { | |
1427 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); | |
1428 | ||
1429 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, | |
1430 | &msg[offset], | |
1431 | tosend); | |
1432 | if (ret != tosend) { | |
1433 | if (ret == -EIO && retries < 5) { | |
1434 | retries++; | |
1435 | goto retry; | |
1436 | } | |
1437 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); | |
ad7f8a1f DA |
1438 | |
1439 | return -EIO; | |
1440 | } | |
1441 | offset += tosend; | |
1442 | total -= tosend; | |
1443 | } while (total > 0); | |
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, | |
1448 | struct drm_dp_sideband_msg_tx *txmsg) | |
1449 | { | |
1450 | struct drm_dp_mst_branch *mstb = txmsg->dst; | |
bd934320 | 1451 | u8 req_type; |
ad7f8a1f DA |
1452 | |
1453 | /* both msg slots are full */ | |
1454 | if (txmsg->seqno == -1) { | |
1455 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { | |
1456 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); | |
1457 | return -EAGAIN; | |
1458 | } | |
1459 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { | |
1460 | txmsg->seqno = mstb->last_seqno; | |
1461 | mstb->last_seqno ^= 1; | |
1462 | } else if (mstb->tx_slots[0] == NULL) | |
1463 | txmsg->seqno = 0; | |
1464 | else | |
1465 | txmsg->seqno = 1; | |
1466 | mstb->tx_slots[txmsg->seqno] = txmsg; | |
1467 | } | |
bd934320 ML |
1468 | |
1469 | req_type = txmsg->msg[0] & 0x7f; | |
1470 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || | |
1471 | req_type == DP_RESOURCE_STATUS_NOTIFY) | |
1472 | hdr->broadcast = 1; | |
1473 | else | |
1474 | hdr->broadcast = 0; | |
ad7f8a1f DA |
1475 | hdr->path_msg = txmsg->path_msg; |
1476 | hdr->lct = mstb->lct; | |
1477 | hdr->lcr = mstb->lct - 1; | |
1478 | if (mstb->lct > 1) | |
1479 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); | |
1480 | hdr->seqno = txmsg->seqno; | |
1481 | return 0; | |
1482 | } | |
1483 | /* | |
1484 | * process a single block of the next message in the sideband queue | |
1485 | */ | |
1486 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, | |
1487 | struct drm_dp_sideband_msg_tx *txmsg, | |
1488 | bool up) | |
1489 | { | |
1490 | u8 chunk[48]; | |
1491 | struct drm_dp_sideband_msg_hdr hdr; | |
1492 | int len, space, idx, tosend; | |
1493 | int ret; | |
1494 | ||
bf3719c0 DL |
1495 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
1496 | ||
ad7f8a1f DA |
1497 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
1498 | txmsg->seqno = -1; | |
1499 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; | |
1500 | } | |
1501 | ||
1502 | /* make hdr from dst mst - for replies use seqno | |
1503 | otherwise assign one */ | |
1504 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); | |
1505 | if (ret < 0) | |
1506 | return ret; | |
1507 | ||
1508 | /* amount left to send in this message */ | |
1509 | len = txmsg->cur_len - txmsg->cur_offset; | |
1510 | ||
1511 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ | |
1512 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); | |
1513 | ||
1514 | tosend = min(len, space); | |
1515 | if (len == txmsg->cur_len) | |
1516 | hdr.somt = 1; | |
1517 | if (space >= len) | |
1518 | hdr.eomt = 1; | |
1519 | ||
1520 | ||
1521 | hdr.msg_len = tosend + 1; | |
1522 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); | |
1523 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); | |
1524 | /* add crc at end */ | |
1525 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); | |
1526 | idx += tosend + 1; | |
1527 | ||
1528 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); | |
1529 | if (ret) { | |
1530 | DRM_DEBUG_KMS("sideband msg failed to send\n"); | |
1531 | return ret; | |
1532 | } | |
1533 | ||
1534 | txmsg->cur_offset += tosend; | |
1535 | if (txmsg->cur_offset == txmsg->cur_len) { | |
1536 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; | |
1537 | return 1; | |
1538 | } | |
1539 | return 0; | |
1540 | } | |
1541 | ||
ad7f8a1f DA |
1542 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
1543 | { | |
1544 | struct drm_dp_sideband_msg_tx *txmsg; | |
1545 | int ret; | |
1546 | ||
cd961bb9 DV |
1547 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
1548 | ||
ad7f8a1f | 1549 | /* construct a chunk from the first msg in the tx_msg queue */ |
cb021a3e | 1550 | if (list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f | 1551 | return; |
ad7f8a1f DA |
1552 | |
1553 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); | |
1554 | ret = process_single_tx_qlock(mgr, txmsg, false); | |
1555 | if (ret == 1) { | |
1556 | /* txmsg is sent it should be in the slots now */ | |
1557 | list_del(&txmsg->next); | |
1558 | } else if (ret) { | |
1559 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); | |
1560 | list_del(&txmsg->next); | |
1561 | if (txmsg->seqno != -1) | |
1562 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
1563 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
68e989dc | 1564 | wake_up_all(&mgr->tx_waitq); |
ad7f8a1f | 1565 | } |
ad7f8a1f DA |
1566 | } |
1567 | ||
1568 | /* called holding qlock */ | |
1f16ee7f ML |
1569 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
1570 | struct drm_dp_sideband_msg_tx *txmsg) | |
ad7f8a1f | 1571 | { |
ad7f8a1f DA |
1572 | int ret; |
1573 | ||
1574 | /* construct a chunk from the first msg in the tx_msg queue */ | |
ad7f8a1f | 1575 | ret = process_single_tx_qlock(mgr, txmsg, true); |
1f16ee7f ML |
1576 | |
1577 | if (ret != 1) | |
ad7f8a1f | 1578 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
1f16ee7f ML |
1579 | |
1580 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
ad7f8a1f DA |
1581 | } |
1582 | ||
1583 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, | |
1584 | struct drm_dp_sideband_msg_tx *txmsg) | |
1585 | { | |
1586 | mutex_lock(&mgr->qlock); | |
1587 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); | |
cb021a3e | 1588 | if (list_is_singular(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
1589 | process_single_down_tx_qlock(mgr); |
1590 | mutex_unlock(&mgr->qlock); | |
1591 | } | |
1592 | ||
68d8c9fc DA |
1593 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1594 | struct drm_dp_mst_branch *mstb) | |
ad7f8a1f DA |
1595 | { |
1596 | int len; | |
1597 | struct drm_dp_sideband_msg_tx *txmsg; | |
1598 | int ret; | |
1599 | ||
1600 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1601 | if (!txmsg) | |
68d8c9fc | 1602 | return; |
ad7f8a1f DA |
1603 | |
1604 | txmsg->dst = mstb; | |
1605 | len = build_link_address(txmsg); | |
1606 | ||
68d8c9fc | 1607 | mstb->link_address_sent = true; |
ad7f8a1f DA |
1608 | drm_dp_queue_down_tx(mgr, txmsg); |
1609 | ||
1610 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1611 | if (ret > 0) { | |
1612 | int i; | |
1613 | ||
1614 | if (txmsg->reply.reply_type == 1) | |
1615 | DRM_DEBUG_KMS("link address nak received\n"); | |
1616 | else { | |
1617 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); | |
1618 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { | |
1619 | DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, | |
1620 | txmsg->reply.u.link_addr.ports[i].input_port, | |
1621 | txmsg->reply.u.link_addr.ports[i].peer_device_type, | |
1622 | txmsg->reply.u.link_addr.ports[i].port_number, | |
1623 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, | |
1624 | txmsg->reply.u.link_addr.ports[i].mcs, | |
1625 | txmsg->reply.u.link_addr.ports[i].ddps, | |
1626 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, | |
1627 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, | |
1628 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); | |
1629 | } | |
5e93b820 HW |
1630 | |
1631 | drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); | |
1632 | ||
ad7f8a1f DA |
1633 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
1634 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); | |
1635 | } | |
8ae22cb4 | 1636 | (*mgr->cbs->hotplug)(mgr); |
ad7f8a1f | 1637 | } |
68d8c9fc DA |
1638 | } else { |
1639 | mstb->link_address_sent = false; | |
ad7f8a1f | 1640 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
68d8c9fc | 1641 | } |
ad7f8a1f DA |
1642 | |
1643 | kfree(txmsg); | |
ad7f8a1f DA |
1644 | } |
1645 | ||
1646 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, | |
1647 | struct drm_dp_mst_branch *mstb, | |
1648 | struct drm_dp_mst_port *port) | |
1649 | { | |
1650 | int len; | |
1651 | struct drm_dp_sideband_msg_tx *txmsg; | |
1652 | int ret; | |
1653 | ||
1654 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1655 | if (!txmsg) | |
1656 | return -ENOMEM; | |
1657 | ||
1658 | txmsg->dst = mstb; | |
1659 | len = build_enum_path_resources(txmsg, port->port_num); | |
1660 | ||
1661 | drm_dp_queue_down_tx(mgr, txmsg); | |
1662 | ||
1663 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1664 | if (ret > 0) { | |
1665 | if (txmsg->reply.reply_type == 1) | |
1666 | DRM_DEBUG_KMS("enum path resources nak received\n"); | |
1667 | else { | |
1668 | if (port->port_num != txmsg->reply.u.path_resources.port_number) | |
1669 | DRM_ERROR("got incorrect port in response\n"); | |
1670 | DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, | |
1671 | txmsg->reply.u.path_resources.avail_payload_bw_number); | |
1672 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; | |
1673 | } | |
1674 | } | |
1675 | ||
1676 | kfree(txmsg); | |
1677 | return 0; | |
1678 | } | |
1679 | ||
91a25e46 ML |
1680 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
1681 | { | |
1682 | if (!mstb->port_parent) | |
1683 | return NULL; | |
1684 | ||
1685 | if (mstb->port_parent->mstb != mstb) | |
1686 | return mstb->port_parent; | |
1687 | ||
1688 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); | |
1689 | } | |
1690 | ||
1691 | static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, | |
1692 | struct drm_dp_mst_branch *mstb, | |
1693 | int *port_num) | |
1694 | { | |
1695 | struct drm_dp_mst_branch *rmstb = NULL; | |
1696 | struct drm_dp_mst_port *found_port; | |
1697 | mutex_lock(&mgr->lock); | |
1698 | if (mgr->mst_primary) { | |
1699 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); | |
1700 | ||
1701 | if (found_port) { | |
1702 | rmstb = found_port->parent; | |
1703 | kref_get(&rmstb->kref); | |
1704 | *port_num = found_port->port_num; | |
1705 | } | |
1706 | } | |
1707 | mutex_unlock(&mgr->lock); | |
1708 | return rmstb; | |
1709 | } | |
1710 | ||
8fa6a425 TR |
1711 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
1712 | struct drm_dp_mst_port *port, | |
1713 | int id, | |
1714 | int pbn) | |
ad7f8a1f DA |
1715 | { |
1716 | struct drm_dp_sideband_msg_tx *txmsg; | |
1717 | struct drm_dp_mst_branch *mstb; | |
91a25e46 | 1718 | int len, ret, port_num; |
ef8f9bea LY |
1719 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
1720 | int i; | |
ad7f8a1f | 1721 | |
deba0a2a | 1722 | port = drm_dp_get_validated_port_ref(mgr, port); |
1723 | if (!port) | |
1724 | return -EINVAL; | |
1725 | ||
91a25e46 | 1726 | port_num = port->port_num; |
ad7f8a1f | 1727 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
91a25e46 ML |
1728 | if (!mstb) { |
1729 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); | |
1730 | ||
deba0a2a | 1731 | if (!mstb) { |
1732 | drm_dp_put_port(port); | |
91a25e46 | 1733 | return -EINVAL; |
deba0a2a | 1734 | } |
91a25e46 | 1735 | } |
ad7f8a1f DA |
1736 | |
1737 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1738 | if (!txmsg) { | |
1739 | ret = -ENOMEM; | |
1740 | goto fail_put; | |
1741 | } | |
1742 | ||
ef8f9bea LY |
1743 | for (i = 0; i < port->num_sdp_streams; i++) |
1744 | sinks[i] = i; | |
1745 | ||
ad7f8a1f | 1746 | txmsg->dst = mstb; |
91a25e46 | 1747 | len = build_allocate_payload(txmsg, port_num, |
ad7f8a1f | 1748 | id, |
ef8f9bea | 1749 | pbn, port->num_sdp_streams, sinks); |
ad7f8a1f DA |
1750 | |
1751 | drm_dp_queue_down_tx(mgr, txmsg); | |
1752 | ||
1753 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1754 | if (ret > 0) { | |
1755 | if (txmsg->reply.reply_type == 1) { | |
1756 | ret = -EINVAL; | |
1757 | } else | |
1758 | ret = 0; | |
1759 | } | |
1760 | kfree(txmsg); | |
1761 | fail_put: | |
1762 | drm_dp_put_mst_branch_device(mstb); | |
deba0a2a | 1763 | drm_dp_put_port(port); |
ad7f8a1f DA |
1764 | return ret; |
1765 | } | |
1766 | ||
0bb9c2b2 DP |
1767 | int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, |
1768 | struct drm_dp_mst_port *port, bool power_up) | |
1769 | { | |
1770 | struct drm_dp_sideband_msg_tx *txmsg; | |
1771 | int len, ret; | |
1772 | ||
1773 | port = drm_dp_get_validated_port_ref(mgr, port); | |
1774 | if (!port) | |
1775 | return -EINVAL; | |
1776 | ||
1777 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1778 | if (!txmsg) { | |
1779 | drm_dp_put_port(port); | |
1780 | return -ENOMEM; | |
1781 | } | |
1782 | ||
1783 | txmsg->dst = port->parent; | |
1784 | len = build_power_updown_phy(txmsg, port->port_num, power_up); | |
1785 | drm_dp_queue_down_tx(mgr, txmsg); | |
1786 | ||
1787 | ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); | |
1788 | if (ret > 0) { | |
1789 | if (txmsg->reply.reply_type == 1) | |
1790 | ret = -EINVAL; | |
1791 | else | |
1792 | ret = 0; | |
1793 | } | |
1794 | kfree(txmsg); | |
1795 | drm_dp_put_port(port); | |
1796 | ||
1797 | return ret; | |
1798 | } | |
1799 | EXPORT_SYMBOL(drm_dp_send_power_updown_phy); | |
1800 | ||
ad7f8a1f DA |
1801 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
1802 | int id, | |
1803 | struct drm_dp_payload *payload) | |
1804 | { | |
1805 | int ret; | |
1806 | ||
1807 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); | |
1808 | if (ret < 0) { | |
1809 | payload->payload_state = 0; | |
1810 | return ret; | |
1811 | } | |
1812 | payload->payload_state = DP_PAYLOAD_LOCAL; | |
1813 | return 0; | |
1814 | } | |
1815 | ||
8fa6a425 TR |
1816 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
1817 | struct drm_dp_mst_port *port, | |
1818 | int id, | |
1819 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1820 | { |
1821 | int ret; | |
1822 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); | |
1823 | if (ret < 0) | |
1824 | return ret; | |
1825 | payload->payload_state = DP_PAYLOAD_REMOTE; | |
1826 | return ret; | |
1827 | } | |
1828 | ||
8fa6a425 TR |
1829 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
1830 | struct drm_dp_mst_port *port, | |
1831 | int id, | |
1832 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1833 | { |
1834 | DRM_DEBUG_KMS("\n"); | |
1835 | /* its okay for these to fail */ | |
1836 | if (port) { | |
1837 | drm_dp_payload_send_msg(mgr, port, id, 0); | |
1838 | } | |
1839 | ||
1840 | drm_dp_dpcd_write_payload(mgr, id, payload); | |
dfda0df3 | 1841 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
ad7f8a1f DA |
1842 | return 0; |
1843 | } | |
1844 | ||
8fa6a425 TR |
1845 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
1846 | int id, | |
1847 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1848 | { |
1849 | payload->payload_state = 0; | |
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | /** | |
1854 | * drm_dp_update_payload_part1() - Execute payload update part 1 | |
1855 | * @mgr: manager to use. | |
1856 | * | |
1857 | * This iterates over all proposed virtual channels, and tries to | |
1858 | * allocate space in the link for them. For 0->slots transitions, | |
1859 | * this step just writes the VCPI to the MST device. For slots->0 | |
1860 | * transitions, this writes the updated VCPIs and removes the | |
1861 | * remote VC payloads. | |
1862 | * | |
1863 | * after calling this the driver should generate ACT and payload | |
1864 | * packets. | |
1865 | */ | |
1866 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) | |
1867 | { | |
dfda0df3 | 1868 | int i, j; |
ad7f8a1f DA |
1869 | int cur_slots = 1; |
1870 | struct drm_dp_payload req_payload; | |
1871 | struct drm_dp_mst_port *port; | |
1872 | ||
1873 | mutex_lock(&mgr->payload_lock); | |
1874 | for (i = 0; i < mgr->max_payloads; i++) { | |
1875 | /* solve the current payloads - compare to the hw ones | |
1876 | - update the hw view */ | |
1877 | req_payload.start_slot = cur_slots; | |
1878 | if (mgr->proposed_vcpis[i]) { | |
1879 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
263efde3 | 1880 | port = drm_dp_get_validated_port_ref(mgr, port); |
1881 | if (!port) { | |
1882 | mutex_unlock(&mgr->payload_lock); | |
1883 | return -EINVAL; | |
1884 | } | |
ad7f8a1f | 1885 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; |
6cecdf7a | 1886 | req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; |
ad7f8a1f DA |
1887 | } else { |
1888 | port = NULL; | |
1889 | req_payload.num_slots = 0; | |
1890 | } | |
dfda0df3 DA |
1891 | |
1892 | if (mgr->payloads[i].start_slot != req_payload.start_slot) { | |
1893 | mgr->payloads[i].start_slot = req_payload.start_slot; | |
1894 | } | |
ad7f8a1f | 1895 | /* work out what is required to happen with this payload */ |
dfda0df3 | 1896 | if (mgr->payloads[i].num_slots != req_payload.num_slots) { |
ad7f8a1f DA |
1897 | |
1898 | /* need to push an update for this payload */ | |
1899 | if (req_payload.num_slots) { | |
dfda0df3 | 1900 | drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); |
ad7f8a1f | 1901 | mgr->payloads[i].num_slots = req_payload.num_slots; |
6cecdf7a | 1902 | mgr->payloads[i].vcpi = req_payload.vcpi; |
ad7f8a1f DA |
1903 | } else if (mgr->payloads[i].num_slots) { |
1904 | mgr->payloads[i].num_slots = 0; | |
bb08c04d | 1905 | drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]); |
ad7f8a1f | 1906 | req_payload.payload_state = mgr->payloads[i].payload_state; |
dfda0df3 DA |
1907 | mgr->payloads[i].start_slot = 0; |
1908 | } | |
ad7f8a1f DA |
1909 | mgr->payloads[i].payload_state = req_payload.payload_state; |
1910 | } | |
1911 | cur_slots += req_payload.num_slots; | |
263efde3 | 1912 | |
1913 | if (port) | |
1914 | drm_dp_put_port(port); | |
ad7f8a1f | 1915 | } |
dfda0df3 DA |
1916 | |
1917 | for (i = 0; i < mgr->max_payloads; i++) { | |
1918 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { | |
1919 | DRM_DEBUG_KMS("removing payload %d\n", i); | |
1920 | for (j = i; j < mgr->max_payloads - 1; j++) { | |
1921 | memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); | |
1922 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; | |
1923 | if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { | |
1924 | set_bit(j + 1, &mgr->payload_mask); | |
1925 | } else { | |
1926 | clear_bit(j + 1, &mgr->payload_mask); | |
1927 | } | |
1928 | } | |
1929 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); | |
1930 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; | |
1931 | clear_bit(mgr->max_payloads, &mgr->payload_mask); | |
1932 | ||
1933 | } | |
1934 | } | |
ad7f8a1f DA |
1935 | mutex_unlock(&mgr->payload_lock); |
1936 | ||
1937 | return 0; | |
1938 | } | |
1939 | EXPORT_SYMBOL(drm_dp_update_payload_part1); | |
1940 | ||
1941 | /** | |
1942 | * drm_dp_update_payload_part2() - Execute payload update part 2 | |
1943 | * @mgr: manager to use. | |
1944 | * | |
1945 | * This iterates over all proposed virtual channels, and tries to | |
1946 | * allocate space in the link for them. For 0->slots transitions, | |
1947 | * this step writes the remote VC payload commands. For slots->0 | |
1948 | * this just resets some internal state. | |
1949 | */ | |
1950 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) | |
1951 | { | |
1952 | struct drm_dp_mst_port *port; | |
1953 | int i; | |
7389ad4b | 1954 | int ret = 0; |
ad7f8a1f DA |
1955 | mutex_lock(&mgr->payload_lock); |
1956 | for (i = 0; i < mgr->max_payloads; i++) { | |
1957 | ||
1958 | if (!mgr->proposed_vcpis[i]) | |
1959 | continue; | |
1960 | ||
1961 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
1962 | ||
1963 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); | |
1964 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { | |
dfda0df3 | 1965 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f | 1966 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
dfda0df3 | 1967 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f DA |
1968 | } |
1969 | if (ret) { | |
1970 | mutex_unlock(&mgr->payload_lock); | |
1971 | return ret; | |
1972 | } | |
1973 | } | |
1974 | mutex_unlock(&mgr->payload_lock); | |
1975 | return 0; | |
1976 | } | |
1977 | EXPORT_SYMBOL(drm_dp_update_payload_part2); | |
1978 | ||
1979 | #if 0 /* unused as of yet */ | |
1980 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, | |
1981 | struct drm_dp_mst_port *port, | |
1982 | int offset, int size) | |
1983 | { | |
1984 | int len; | |
1985 | struct drm_dp_sideband_msg_tx *txmsg; | |
1986 | ||
1987 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1988 | if (!txmsg) | |
1989 | return -ENOMEM; | |
1990 | ||
1991 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); | |
1992 | txmsg->dst = port->parent; | |
1993 | ||
1994 | drm_dp_queue_down_tx(mgr, txmsg); | |
1995 | ||
1996 | return 0; | |
1997 | } | |
1998 | #endif | |
1999 | ||
2000 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
2001 | struct drm_dp_mst_port *port, | |
2002 | int offset, int size, u8 *bytes) | |
2003 | { | |
2004 | int len; | |
2005 | int ret; | |
2006 | struct drm_dp_sideband_msg_tx *txmsg; | |
2007 | struct drm_dp_mst_branch *mstb; | |
2008 | ||
2009 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
2010 | if (!mstb) | |
2011 | return -EINVAL; | |
2012 | ||
2013 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2014 | if (!txmsg) { | |
2015 | ret = -ENOMEM; | |
2016 | goto fail_put; | |
2017 | } | |
2018 | ||
2019 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); | |
2020 | txmsg->dst = mstb; | |
2021 | ||
2022 | drm_dp_queue_down_tx(mgr, txmsg); | |
2023 | ||
2024 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
2025 | if (ret > 0) { | |
2026 | if (txmsg->reply.reply_type == 1) { | |
2027 | ret = -EINVAL; | |
2028 | } else | |
2029 | ret = 0; | |
2030 | } | |
2031 | kfree(txmsg); | |
2032 | fail_put: | |
2033 | drm_dp_put_mst_branch_device(mstb); | |
2034 | return ret; | |
2035 | } | |
2036 | ||
2037 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) | |
2038 | { | |
2039 | struct drm_dp_sideband_msg_reply_body reply; | |
2040 | ||
a68d2437 | 2041 | reply.reply_type = 0; |
ad7f8a1f DA |
2042 | reply.req_type = req_type; |
2043 | drm_dp_encode_sideband_reply(&reply, msg); | |
2044 | return 0; | |
2045 | } | |
2046 | ||
2047 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, | |
2048 | struct drm_dp_mst_branch *mstb, | |
2049 | int req_type, int seqno, bool broadcast) | |
2050 | { | |
2051 | struct drm_dp_sideband_msg_tx *txmsg; | |
2052 | ||
2053 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2054 | if (!txmsg) | |
2055 | return -ENOMEM; | |
2056 | ||
2057 | txmsg->dst = mstb; | |
2058 | txmsg->seqno = seqno; | |
2059 | drm_dp_encode_up_ack_reply(txmsg, req_type); | |
2060 | ||
2061 | mutex_lock(&mgr->qlock); | |
1f16ee7f ML |
2062 | |
2063 | process_single_up_tx_qlock(mgr, txmsg); | |
2064 | ||
ad7f8a1f | 2065 | mutex_unlock(&mgr->qlock); |
1f16ee7f ML |
2066 | |
2067 | kfree(txmsg); | |
ad7f8a1f DA |
2068 | return 0; |
2069 | } | |
2070 | ||
b853fdb3 CW |
2071 | static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
2072 | int dp_link_count, | |
2073 | int *out) | |
ad7f8a1f DA |
2074 | { |
2075 | switch (dp_link_bw) { | |
b853fdb3 CW |
2076 | default: |
2077 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", | |
2078 | dp_link_bw, dp_link_count); | |
2079 | return false; | |
2080 | ||
ad7f8a1f | 2081 | case DP_LINK_BW_1_62: |
b853fdb3 CW |
2082 | *out = 3 * dp_link_count; |
2083 | break; | |
ad7f8a1f | 2084 | case DP_LINK_BW_2_7: |
b853fdb3 CW |
2085 | *out = 5 * dp_link_count; |
2086 | break; | |
ad7f8a1f | 2087 | case DP_LINK_BW_5_4: |
b853fdb3 CW |
2088 | *out = 10 * dp_link_count; |
2089 | break; | |
ad7f8a1f | 2090 | } |
b853fdb3 | 2091 | return true; |
ad7f8a1f DA |
2092 | } |
2093 | ||
2094 | /** | |
2095 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager | |
2096 | * @mgr: manager to set state for | |
2097 | * @mst_state: true to enable MST on this connector - false to disable. | |
2098 | * | |
2099 | * This is called by the driver when it detects an MST capable device plugged | |
2100 | * into a DP MST capable port, or when a DP MST capable device is unplugged. | |
2101 | */ | |
2102 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) | |
2103 | { | |
2104 | int ret = 0; | |
2105 | struct drm_dp_mst_branch *mstb = NULL; | |
2106 | ||
2107 | mutex_lock(&mgr->lock); | |
2108 | if (mst_state == mgr->mst_state) | |
2109 | goto out_unlock; | |
2110 | ||
2111 | mgr->mst_state = mst_state; | |
2112 | /* set the device into MST mode */ | |
2113 | if (mst_state) { | |
2114 | WARN_ON(mgr->mst_primary); | |
2115 | ||
2116 | /* get dpcd info */ | |
2117 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); | |
2118 | if (ret != DP_RECEIVER_CAP_SIZE) { | |
2119 | DRM_DEBUG_KMS("failed to read DPCD\n"); | |
2120 | goto out_unlock; | |
2121 | } | |
2122 | ||
b853fdb3 CW |
2123 | if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
2124 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, | |
2125 | &mgr->pbn_div)) { | |
2126 | ret = -EINVAL; | |
2127 | goto out_unlock; | |
2128 | } | |
2129 | ||
ad7f8a1f DA |
2130 | /* add initial branch device at LCT 1 */ |
2131 | mstb = drm_dp_add_mst_branch_device(1, NULL); | |
2132 | if (mstb == NULL) { | |
2133 | ret = -ENOMEM; | |
2134 | goto out_unlock; | |
2135 | } | |
2136 | mstb->mgr = mgr; | |
2137 | ||
2138 | /* give this the main reference */ | |
2139 | mgr->mst_primary = mstb; | |
2140 | kref_get(&mgr->mst_primary->kref); | |
2141 | ||
c175cd16 AG |
2142 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
2143 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
2144 | if (ret < 0) { | |
2145 | goto out_unlock; | |
2146 | } | |
2147 | ||
ad7f8a1f DA |
2148 | { |
2149 | struct drm_dp_payload reset_pay; | |
2150 | reset_pay.start_slot = 0; | |
2151 | reset_pay.num_slots = 0x3f; | |
2152 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); | |
2153 | } | |
2154 | ||
ad7f8a1f DA |
2155 | queue_work(system_long_wq, &mgr->work); |
2156 | ||
2157 | ret = 0; | |
2158 | } else { | |
2159 | /* disable MST on the device */ | |
2160 | mstb = mgr->mst_primary; | |
2161 | mgr->mst_primary = NULL; | |
2162 | /* this can fail if the device is gone */ | |
2163 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); | |
2164 | ret = 0; | |
2165 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); | |
2166 | mgr->payload_mask = 0; | |
2167 | set_bit(0, &mgr->payload_mask); | |
dfda0df3 | 2168 | mgr->vcpi_mask = 0; |
ad7f8a1f DA |
2169 | } |
2170 | ||
2171 | out_unlock: | |
2172 | mutex_unlock(&mgr->lock); | |
2173 | if (mstb) | |
2174 | drm_dp_put_mst_branch_device(mstb); | |
2175 | return ret; | |
2176 | ||
2177 | } | |
2178 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); | |
2179 | ||
2180 | /** | |
2181 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager | |
2182 | * @mgr: manager to suspend | |
2183 | * | |
2184 | * This function tells the MST device that we can't handle UP messages | |
2185 | * anymore. This should stop it from sending any since we are suspended. | |
2186 | */ | |
2187 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) | |
2188 | { | |
2189 | mutex_lock(&mgr->lock); | |
2190 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
2191 | DP_MST_EN | DP_UPSTREAM_IS_SRC); | |
2192 | mutex_unlock(&mgr->lock); | |
274d8352 DA |
2193 | flush_work(&mgr->work); |
2194 | flush_work(&mgr->destroy_connector_work); | |
ad7f8a1f DA |
2195 | } |
2196 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); | |
2197 | ||
2198 | /** | |
2199 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager | |
2200 | * @mgr: manager to resume | |
2201 | * | |
2202 | * This will fetch DPCD and see if the device is still there, | |
2203 | * if it is, it will rewrite the MSTM control bits, and return. | |
2204 | * | |
2205 | * if the device fails this returns -1, and the driver should do | |
2206 | * a full MST reprobe, in case we were undocked. | |
2207 | */ | |
2208 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) | |
2209 | { | |
2210 | int ret = 0; | |
2211 | ||
2212 | mutex_lock(&mgr->lock); | |
2213 | ||
2214 | if (mgr->mst_primary) { | |
2215 | int sret; | |
1652fce6 L |
2216 | u8 guid[16]; |
2217 | ||
ad7f8a1f DA |
2218 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
2219 | if (sret != DP_RECEIVER_CAP_SIZE) { | |
2220 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
2221 | ret = -1; | |
2222 | goto out_unlock; | |
2223 | } | |
2224 | ||
2225 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
2226 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
2227 | if (ret < 0) { | |
2228 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); | |
2229 | ret = -1; | |
2230 | goto out_unlock; | |
2231 | } | |
1652fce6 L |
2232 | |
2233 | /* Some hubs forget their guids after they resume */ | |
2234 | sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); | |
2235 | if (sret != 16) { | |
2236 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
2237 | ret = -1; | |
2238 | goto out_unlock; | |
2239 | } | |
2240 | drm_dp_check_mstb_guid(mgr->mst_primary, guid); | |
2241 | ||
ad7f8a1f DA |
2242 | ret = 0; |
2243 | } else | |
2244 | ret = -1; | |
2245 | ||
2246 | out_unlock: | |
2247 | mutex_unlock(&mgr->lock); | |
2248 | return ret; | |
2249 | } | |
2250 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); | |
2251 | ||
636c4c3e | 2252 | static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) |
ad7f8a1f DA |
2253 | { |
2254 | int len; | |
2255 | u8 replyblock[32]; | |
2256 | int replylen, origlen, curreply; | |
2257 | int ret; | |
2258 | struct drm_dp_sideband_msg_rx *msg; | |
2259 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; | |
2260 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; | |
2261 | ||
2262 | len = min(mgr->max_dpcd_transaction_bytes, 16); | |
2263 | ret = drm_dp_dpcd_read(mgr->aux, basereg, | |
2264 | replyblock, len); | |
2265 | if (ret != len) { | |
2266 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); | |
636c4c3e | 2267 | return false; |
ad7f8a1f DA |
2268 | } |
2269 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); | |
2270 | if (!ret) { | |
2271 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); | |
636c4c3e | 2272 | return false; |
ad7f8a1f DA |
2273 | } |
2274 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; | |
2275 | ||
2276 | origlen = replylen; | |
2277 | replylen -= len; | |
2278 | curreply = len; | |
2279 | while (replylen > 0) { | |
2280 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); | |
2281 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, | |
2282 | replyblock, len); | |
2283 | if (ret != len) { | |
448421b5 ID |
2284 | DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", |
2285 | len, ret); | |
636c4c3e | 2286 | return false; |
ad7f8a1f | 2287 | } |
448421b5 | 2288 | |
ad7f8a1f | 2289 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
448421b5 | 2290 | if (!ret) { |
ad7f8a1f | 2291 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
636c4c3e | 2292 | return false; |
448421b5 ID |
2293 | } |
2294 | ||
ad7f8a1f DA |
2295 | curreply += len; |
2296 | replylen -= len; | |
2297 | } | |
636c4c3e | 2298 | return true; |
ad7f8a1f DA |
2299 | } |
2300 | ||
2301 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) | |
2302 | { | |
2303 | int ret = 0; | |
2304 | ||
636c4c3e ID |
2305 | if (!drm_dp_get_one_sb_msg(mgr, false)) { |
2306 | memset(&mgr->down_rep_recv, 0, | |
2307 | sizeof(struct drm_dp_sideband_msg_rx)); | |
2308 | return 0; | |
2309 | } | |
ad7f8a1f DA |
2310 | |
2311 | if (mgr->down_rep_recv.have_eomt) { | |
2312 | struct drm_dp_sideband_msg_tx *txmsg; | |
2313 | struct drm_dp_mst_branch *mstb; | |
2314 | int slot = -1; | |
2315 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2316 | mgr->down_rep_recv.initial_hdr.lct, | |
2317 | mgr->down_rep_recv.initial_hdr.rad); | |
2318 | ||
2319 | if (!mstb) { | |
2320 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); | |
2321 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2322 | return 0; | |
2323 | } | |
2324 | ||
2325 | /* find the message */ | |
2326 | slot = mgr->down_rep_recv.initial_hdr.seqno; | |
2327 | mutex_lock(&mgr->qlock); | |
2328 | txmsg = mstb->tx_slots[slot]; | |
2329 | /* remove from slots */ | |
2330 | mutex_unlock(&mgr->qlock); | |
2331 | ||
2332 | if (!txmsg) { | |
2333 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", | |
2334 | mstb, | |
2335 | mgr->down_rep_recv.initial_hdr.seqno, | |
2336 | mgr->down_rep_recv.initial_hdr.lct, | |
2337 | mgr->down_rep_recv.initial_hdr.rad[0], | |
2338 | mgr->down_rep_recv.msg[0]); | |
2339 | drm_dp_put_mst_branch_device(mstb); | |
2340 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2341 | return 0; | |
2342 | } | |
2343 | ||
2344 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); | |
2345 | if (txmsg->reply.reply_type == 1) { | |
2346 | DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); | |
2347 | } | |
2348 | ||
2349 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2350 | drm_dp_put_mst_branch_device(mstb); | |
2351 | ||
2352 | mutex_lock(&mgr->qlock); | |
2353 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; | |
2354 | mstb->tx_slots[slot] = NULL; | |
2355 | mutex_unlock(&mgr->qlock); | |
2356 | ||
68e989dc | 2357 | wake_up_all(&mgr->tx_waitq); |
ad7f8a1f DA |
2358 | } |
2359 | return ret; | |
2360 | } | |
2361 | ||
2362 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) | |
2363 | { | |
2364 | int ret = 0; | |
636c4c3e ID |
2365 | |
2366 | if (!drm_dp_get_one_sb_msg(mgr, true)) { | |
2367 | memset(&mgr->up_req_recv, 0, | |
2368 | sizeof(struct drm_dp_sideband_msg_rx)); | |
2369 | return 0; | |
2370 | } | |
ad7f8a1f DA |
2371 | |
2372 | if (mgr->up_req_recv.have_eomt) { | |
2373 | struct drm_dp_sideband_msg_req_body msg; | |
bd934320 | 2374 | struct drm_dp_mst_branch *mstb = NULL; |
ad7f8a1f | 2375 | bool seqno; |
bd934320 ML |
2376 | |
2377 | if (!mgr->up_req_recv.initial_hdr.broadcast) { | |
2378 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2379 | mgr->up_req_recv.initial_hdr.lct, | |
2380 | mgr->up_req_recv.initial_hdr.rad); | |
2381 | if (!mstb) { | |
2382 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2383 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2384 | return 0; | |
2385 | } | |
ad7f8a1f DA |
2386 | } |
2387 | ||
2388 | seqno = mgr->up_req_recv.initial_hdr.seqno; | |
2389 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); | |
2390 | ||
2391 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { | |
bd934320 ML |
2392 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2393 | ||
2394 | if (!mstb) | |
2395 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); | |
2396 | ||
2397 | if (!mstb) { | |
2398 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2399 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2400 | return 0; | |
2401 | } | |
2402 | ||
ad7f8a1f | 2403 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
5e93b820 | 2404 | |
ad7f8a1f | 2405 | DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); |
8ae22cb4 DA |
2406 | (*mgr->cbs->hotplug)(mgr); |
2407 | ||
ad7f8a1f | 2408 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
bd934320 ML |
2409 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2410 | if (!mstb) | |
2411 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); | |
2412 | ||
2413 | if (!mstb) { | |
2414 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2415 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2416 | return 0; | |
2417 | } | |
2418 | ||
ad7f8a1f DA |
2419 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
2420 | } | |
2421 | ||
7f8b3987 ID |
2422 | if (mstb) |
2423 | drm_dp_put_mst_branch_device(mstb); | |
2424 | ||
ad7f8a1f DA |
2425 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
2426 | } | |
2427 | return ret; | |
2428 | } | |
2429 | ||
2430 | /** | |
2431 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify | |
2432 | * @mgr: manager to notify irq for. | |
2433 | * @esi: 4 bytes from SINK_COUNT_ESI | |
295ee853 | 2434 | * @handled: whether the hpd interrupt was consumed or not |
ad7f8a1f DA |
2435 | * |
2436 | * This should be called from the driver when it detects a short IRQ, | |
2437 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The | |
2438 | * topology manager will process the sideband messages received as a result | |
2439 | * of this. | |
2440 | */ | |
2441 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) | |
2442 | { | |
2443 | int ret = 0; | |
2444 | int sc; | |
2445 | *handled = false; | |
2446 | sc = esi[0] & 0x3f; | |
2447 | ||
2448 | if (sc != mgr->sink_count) { | |
2449 | mgr->sink_count = sc; | |
2450 | *handled = true; | |
2451 | } | |
2452 | ||
2453 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { | |
2454 | ret = drm_dp_mst_handle_down_rep(mgr); | |
2455 | *handled = true; | |
2456 | } | |
2457 | ||
2458 | if (esi[1] & DP_UP_REQ_MSG_RDY) { | |
2459 | ret |= drm_dp_mst_handle_up_req(mgr); | |
2460 | *handled = true; | |
2461 | } | |
2462 | ||
2463 | drm_dp_mst_kick_tx(mgr); | |
2464 | return ret; | |
2465 | } | |
2466 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); | |
2467 | ||
2468 | /** | |
2469 | * drm_dp_mst_detect_port() - get connection status for an MST port | |
132d49d7 | 2470 | * @connector: DRM connector for this port |
ad7f8a1f DA |
2471 | * @mgr: manager for this port |
2472 | * @port: unverified pointer to a port | |
2473 | * | |
2474 | * This returns the current connection state for a port. It validates the | |
2475 | * port pointer still exists so the caller doesn't require a reference | |
2476 | */ | |
c6a0aed4 DA |
2477 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, |
2478 | struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
ad7f8a1f DA |
2479 | { |
2480 | enum drm_connector_status status = connector_status_disconnected; | |
2481 | ||
2482 | /* we need to search for the port in the mgr in case its gone */ | |
2483 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2484 | if (!port) | |
2485 | return connector_status_disconnected; | |
2486 | ||
2487 | if (!port->ddps) | |
2488 | goto out; | |
2489 | ||
2490 | switch (port->pdt) { | |
2491 | case DP_PEER_DEVICE_NONE: | |
2492 | case DP_PEER_DEVICE_MST_BRANCHING: | |
2493 | break; | |
2494 | ||
2495 | case DP_PEER_DEVICE_SST_SINK: | |
2496 | status = connector_status_connected; | |
8ae22cb4 DA |
2497 | /* for logical ports - cache the EDID */ |
2498 | if (port->port_num >= 8 && !port->cached_edid) { | |
2499 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); | |
2500 | } | |
ad7f8a1f DA |
2501 | break; |
2502 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
2503 | if (port->ldps) | |
2504 | status = connector_status_connected; | |
2505 | break; | |
2506 | } | |
2507 | out: | |
2508 | drm_dp_put_port(port); | |
2509 | return status; | |
2510 | } | |
2511 | EXPORT_SYMBOL(drm_dp_mst_detect_port); | |
2512 | ||
ef8f9bea LY |
2513 | /** |
2514 | * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not | |
2515 | * @mgr: manager for this port | |
2516 | * @port: unverified pointer to a port. | |
2517 | * | |
2518 | * This returns whether the port supports audio or not. | |
2519 | */ | |
2520 | bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, | |
2521 | struct drm_dp_mst_port *port) | |
2522 | { | |
2523 | bool ret = false; | |
2524 | ||
2525 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2526 | if (!port) | |
2527 | return ret; | |
2528 | ret = port->has_audio; | |
2529 | drm_dp_put_port(port); | |
2530 | return ret; | |
2531 | } | |
2532 | EXPORT_SYMBOL(drm_dp_mst_port_has_audio); | |
2533 | ||
ad7f8a1f DA |
2534 | /** |
2535 | * drm_dp_mst_get_edid() - get EDID for an MST port | |
2536 | * @connector: toplevel connector to get EDID for | |
2537 | * @mgr: manager for this port | |
2538 | * @port: unverified pointer to a port. | |
2539 | * | |
2540 | * This returns an EDID for the port connected to a connector, | |
2541 | * It validates the pointer still exists so the caller doesn't require a | |
2542 | * reference. | |
2543 | */ | |
2544 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2545 | { | |
2546 | struct edid *edid = NULL; | |
2547 | ||
2548 | /* we need to search for the port in the mgr in case its gone */ | |
2549 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2550 | if (!port) | |
2551 | return NULL; | |
2552 | ||
c6a0aed4 DA |
2553 | if (port->cached_edid) |
2554 | edid = drm_edid_duplicate(port->cached_edid); | |
8ae22cb4 DA |
2555 | else { |
2556 | edid = drm_get_edid(connector, &port->aux.ddc); | |
2557 | drm_mode_connector_set_tile_property(connector); | |
2558 | } | |
ef8f9bea | 2559 | port->has_audio = drm_detect_monitor_audio(edid); |
ad7f8a1f DA |
2560 | drm_dp_put_port(port); |
2561 | return edid; | |
2562 | } | |
2563 | EXPORT_SYMBOL(drm_dp_mst_get_edid); | |
2564 | ||
2565 | /** | |
2566 | * drm_dp_find_vcpi_slots() - find slots for this PBN value | |
2567 | * @mgr: manager to use | |
2568 | * @pbn: payload bandwidth to convert into slots. | |
2569 | */ | |
2570 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, | |
2571 | int pbn) | |
2572 | { | |
2573 | int num_slots; | |
2574 | ||
2575 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2576 | ||
feb2c3bc PD |
2577 | /* max. time slots - one slot for MTP header */ |
2578 | if (num_slots > 63) | |
ad7f8a1f DA |
2579 | return -ENOSPC; |
2580 | return num_slots; | |
2581 | } | |
2582 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); | |
2583 | ||
2584 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, | |
1e797f55 | 2585 | struct drm_dp_vcpi *vcpi, int pbn, int slots) |
ad7f8a1f | 2586 | { |
ad7f8a1f DA |
2587 | int ret; |
2588 | ||
feb2c3bc | 2589 | /* max. time slots - one slot for MTP header */ |
1e797f55 | 2590 | if (slots > 63) |
ad7f8a1f DA |
2591 | return -ENOSPC; |
2592 | ||
2593 | vcpi->pbn = pbn; | |
1e797f55 PD |
2594 | vcpi->aligned_pbn = slots * mgr->pbn_div; |
2595 | vcpi->num_slots = slots; | |
ad7f8a1f DA |
2596 | |
2597 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); | |
2598 | if (ret < 0) | |
2599 | return ret; | |
2600 | return 0; | |
2601 | } | |
2602 | ||
edb1ed1a PD |
2603 | /** |
2604 | * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state | |
2605 | * @state: global atomic state | |
2606 | * @mgr: MST topology manager for the port | |
2607 | * @port: port to find vcpi slots for | |
2608 | * @pbn: bandwidth required for the mode in PBN | |
2609 | * | |
2610 | * RETURNS: | |
2611 | * Total slots in the atomic state assigned for this port or error | |
2612 | */ | |
2613 | int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, | |
2614 | struct drm_dp_mst_topology_mgr *mgr, | |
2615 | struct drm_dp_mst_port *port, int pbn) | |
2616 | { | |
2617 | struct drm_dp_mst_topology_state *topology_state; | |
2618 | int req_slots; | |
2619 | ||
2620 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); | |
56a91c49 VS |
2621 | if (IS_ERR(topology_state)) |
2622 | return PTR_ERR(topology_state); | |
edb1ed1a PD |
2623 | |
2624 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2625 | if (port == NULL) | |
2626 | return -EINVAL; | |
2627 | req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2628 | DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n", | |
2629 | req_slots, topology_state->avail_slots); | |
2630 | ||
2631 | if (req_slots > topology_state->avail_slots) { | |
2632 | drm_dp_put_port(port); | |
2633 | return -ENOSPC; | |
2634 | } | |
2635 | ||
2636 | topology_state->avail_slots -= req_slots; | |
2637 | DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots); | |
2638 | ||
2639 | drm_dp_put_port(port); | |
2640 | return req_slots; | |
2641 | } | |
2642 | EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots); | |
2643 | ||
2644 | /** | |
2645 | * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots | |
2646 | * @state: global atomic state | |
2647 | * @mgr: MST topology manager for the port | |
2648 | * @slots: number of vcpi slots to release | |
2649 | * | |
2650 | * RETURNS: | |
2651 | * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or | |
2652 | * negative error code | |
2653 | */ | |
2654 | int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, | |
2655 | struct drm_dp_mst_topology_mgr *mgr, | |
2656 | int slots) | |
2657 | { | |
2658 | struct drm_dp_mst_topology_state *topology_state; | |
2659 | ||
2660 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); | |
56a91c49 VS |
2661 | if (IS_ERR(topology_state)) |
2662 | return PTR_ERR(topology_state); | |
edb1ed1a PD |
2663 | |
2664 | /* We cannot rely on port->vcpi.num_slots to update | |
2665 | * topology_state->avail_slots as the port may not exist if the parent | |
2666 | * branch device was unplugged. This should be fixed by tracking | |
2667 | * per-port slot allocation in drm_dp_mst_topology_state instead of | |
2668 | * depending on the caller to tell us how many slots to release. | |
2669 | */ | |
2670 | topology_state->avail_slots += slots; | |
2671 | DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n", | |
2672 | slots, topology_state->avail_slots); | |
2673 | ||
2674 | return 0; | |
2675 | } | |
2676 | EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots); | |
2677 | ||
ad7f8a1f DA |
2678 | /** |
2679 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel | |
2680 | * @mgr: manager for this port | |
2681 | * @port: port to allocate a virtual channel for. | |
2682 | * @pbn: payload bandwidth number to request | |
2683 | * @slots: returned number of slots for this PBN. | |
2684 | */ | |
1e797f55 PD |
2685 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
2686 | struct drm_dp_mst_port *port, int pbn, int slots) | |
ad7f8a1f DA |
2687 | { |
2688 | int ret; | |
2689 | ||
2690 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2691 | if (!port) | |
2692 | return false; | |
2693 | ||
1e797f55 PD |
2694 | if (slots < 0) |
2695 | return false; | |
2696 | ||
ad7f8a1f DA |
2697 | if (port->vcpi.vcpi > 0) { |
2698 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); | |
2699 | if (pbn == port->vcpi.pbn) { | |
dabe1954 | 2700 | drm_dp_put_port(port); |
ad7f8a1f DA |
2701 | return true; |
2702 | } | |
2703 | } | |
2704 | ||
1e797f55 | 2705 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots); |
ad7f8a1f | 2706 | if (ret) { |
feb2c3bc PD |
2707 | DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n", |
2708 | DIV_ROUND_UP(pbn, mgr->pbn_div), ret); | |
ad7f8a1f DA |
2709 | goto out; |
2710 | } | |
feb2c3bc PD |
2711 | DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n", |
2712 | pbn, port->vcpi.num_slots); | |
ad7f8a1f DA |
2713 | |
2714 | drm_dp_put_port(port); | |
2715 | return true; | |
2716 | out: | |
2717 | return false; | |
2718 | } | |
2719 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); | |
2720 | ||
87f5942d DA |
2721 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
2722 | { | |
2723 | int slots = 0; | |
2724 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2725 | if (!port) | |
2726 | return slots; | |
2727 | ||
2728 | slots = port->vcpi.num_slots; | |
2729 | drm_dp_put_port(port); | |
2730 | return slots; | |
2731 | } | |
2732 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); | |
2733 | ||
ad7f8a1f DA |
2734 | /** |
2735 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI | |
2736 | * @mgr: manager for this port | |
2737 | * @port: unverified pointer to a port. | |
2738 | * | |
2739 | * This just resets the number of slots for the ports VCPI for later programming. | |
2740 | */ | |
2741 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2742 | { | |
2743 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2744 | if (!port) | |
2745 | return; | |
2746 | port->vcpi.num_slots = 0; | |
2747 | drm_dp_put_port(port); | |
2748 | } | |
2749 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); | |
2750 | ||
2751 | /** | |
2752 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI | |
2753 | * @mgr: manager for this port | |
2754 | * @port: unverified port to deallocate vcpi for | |
2755 | */ | |
2756 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2757 | { | |
2758 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2759 | if (!port) | |
2760 | return; | |
2761 | ||
2762 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
2763 | port->vcpi.num_slots = 0; | |
2764 | port->vcpi.pbn = 0; | |
2765 | port->vcpi.aligned_pbn = 0; | |
2766 | port->vcpi.vcpi = 0; | |
2767 | drm_dp_put_port(port); | |
2768 | } | |
2769 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); | |
2770 | ||
2771 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
2772 | int id, struct drm_dp_payload *payload) | |
2773 | { | |
2774 | u8 payload_alloc[3], status; | |
2775 | int ret; | |
2776 | int retries = 0; | |
2777 | ||
2778 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, | |
2779 | DP_PAYLOAD_TABLE_UPDATED); | |
2780 | ||
2781 | payload_alloc[0] = id; | |
2782 | payload_alloc[1] = payload->start_slot; | |
2783 | payload_alloc[2] = payload->num_slots; | |
2784 | ||
2785 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); | |
2786 | if (ret != 3) { | |
2787 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); | |
2788 | goto fail; | |
2789 | } | |
2790 | ||
2791 | retry: | |
2792 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
2793 | if (ret < 0) { | |
2794 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
2795 | goto fail; | |
2796 | } | |
2797 | ||
2798 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { | |
2799 | retries++; | |
2800 | if (retries < 20) { | |
2801 | usleep_range(10000, 20000); | |
2802 | goto retry; | |
2803 | } | |
2804 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); | |
2805 | ret = -EINVAL; | |
2806 | goto fail; | |
2807 | } | |
2808 | ret = 0; | |
2809 | fail: | |
2810 | return ret; | |
2811 | } | |
2812 | ||
2813 | ||
2814 | /** | |
2815 | * drm_dp_check_act_status() - Check ACT handled status. | |
2816 | * @mgr: manager to use | |
2817 | * | |
2818 | * Check the payload status bits in the DPCD for ACT handled completion. | |
2819 | */ | |
2820 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) | |
2821 | { | |
2822 | u8 status; | |
2823 | int ret; | |
2824 | int count = 0; | |
2825 | ||
2826 | do { | |
2827 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
2828 | ||
2829 | if (ret < 0) { | |
2830 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
2831 | goto fail; | |
2832 | } | |
2833 | ||
2834 | if (status & DP_PAYLOAD_ACT_HANDLED) | |
2835 | break; | |
2836 | count++; | |
2837 | udelay(100); | |
2838 | ||
2839 | } while (count < 30); | |
2840 | ||
2841 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { | |
2842 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); | |
2843 | ret = -EINVAL; | |
2844 | goto fail; | |
2845 | } | |
2846 | return 0; | |
2847 | fail: | |
2848 | return ret; | |
2849 | } | |
2850 | EXPORT_SYMBOL(drm_dp_check_act_status); | |
2851 | ||
2852 | /** | |
2853 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. | |
2854 | * @clock: dot clock for the mode | |
2855 | * @bpp: bpp for the mode. | |
2856 | * | |
2857 | * This uses the formula in the spec to calculate the PBN value for a mode. | |
2858 | */ | |
2859 | int drm_dp_calc_pbn_mode(int clock, int bpp) | |
2860 | { | |
a9ebb3e4 HW |
2861 | u64 kbps; |
2862 | s64 peak_kbps; | |
2863 | u32 numerator; | |
2864 | u32 denominator; | |
2865 | ||
2866 | kbps = clock * bpp; | |
2867 | ||
2868 | /* | |
2869 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 | |
2870 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on | |
2871 | * common multiplier to render an integer PBN for all link rate/lane | |
2872 | * counts combinations | |
2873 | * calculate | |
2874 | * peak_kbps *= (1006/1000) | |
2875 | * peak_kbps *= (64/54) | |
2876 | * peak_kbps *= 8 convert to bytes | |
2877 | */ | |
2878 | ||
2879 | numerator = 64 * 1006; | |
2880 | denominator = 54 * 8 * 1000 * 1000; | |
2881 | ||
2882 | kbps *= numerator; | |
2883 | peak_kbps = drm_fixp_from_fraction(kbps, denominator); | |
2884 | ||
2885 | return drm_fixp2int_ceil(peak_kbps); | |
ad7f8a1f DA |
2886 | } |
2887 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); | |
2888 | ||
2889 | static int test_calc_pbn_mode(void) | |
2890 | { | |
2891 | int ret; | |
2892 | ret = drm_dp_calc_pbn_mode(154000, 30); | |
a9ebb3e4 HW |
2893 | if (ret != 689) { |
2894 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
2895 | 154000, 30, 689, ret); | |
ad7f8a1f | 2896 | return -EINVAL; |
a9ebb3e4 | 2897 | } |
ad7f8a1f | 2898 | ret = drm_dp_calc_pbn_mode(234000, 30); |
a9ebb3e4 HW |
2899 | if (ret != 1047) { |
2900 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
2901 | 234000, 30, 1047, ret); | |
ad7f8a1f | 2902 | return -EINVAL; |
a9ebb3e4 HW |
2903 | } |
2904 | ret = drm_dp_calc_pbn_mode(297000, 24); | |
2905 | if (ret != 1063) { | |
2906 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
2907 | 297000, 24, 1063, ret); | |
2908 | return -EINVAL; | |
2909 | } | |
ad7f8a1f DA |
2910 | return 0; |
2911 | } | |
2912 | ||
2913 | /* we want to kick the TX after we've ack the up/down IRQs. */ | |
2914 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) | |
2915 | { | |
2916 | queue_work(system_long_wq, &mgr->tx_work); | |
2917 | } | |
2918 | ||
2919 | static void drm_dp_mst_dump_mstb(struct seq_file *m, | |
2920 | struct drm_dp_mst_branch *mstb) | |
2921 | { | |
2922 | struct drm_dp_mst_port *port; | |
2923 | int tabs = mstb->lct; | |
2924 | char prefix[10]; | |
2925 | int i; | |
2926 | ||
2927 | for (i = 0; i < tabs; i++) | |
2928 | prefix[i] = '\t'; | |
2929 | prefix[i] = '\0'; | |
2930 | ||
2931 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); | |
2932 | list_for_each_entry(port, &mstb->ports, next) { | |
51108f25 | 2933 | 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 |
2934 | if (port->mstb) |
2935 | drm_dp_mst_dump_mstb(m, port->mstb); | |
2936 | } | |
2937 | } | |
2938 | ||
2939 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
2940 | char *buf) | |
2941 | { | |
ad7f8a1f | 2942 | int i; |
46466b0d JP |
2943 | |
2944 | for (i = 0; i < 64; i += 16) { | |
2945 | if (drm_dp_dpcd_read(mgr->aux, | |
2946 | DP_PAYLOAD_TABLE_UPDATE_STATUS + i, | |
2947 | &buf[i], 16) != 16) | |
2948 | return false; | |
ad7f8a1f | 2949 | } |
46466b0d | 2950 | return true; |
ad7f8a1f DA |
2951 | } |
2952 | ||
51108f25 JB |
2953 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
2954 | struct drm_dp_mst_port *port, char *name, | |
2955 | int namelen) | |
2956 | { | |
2957 | struct edid *mst_edid; | |
2958 | ||
2959 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); | |
2960 | drm_edid_get_monitor_name(mst_edid, name, namelen); | |
2961 | } | |
2962 | ||
ad7f8a1f DA |
2963 | /** |
2964 | * drm_dp_mst_dump_topology(): dump topology to seq file. | |
2965 | * @m: seq_file to dump output to | |
2966 | * @mgr: manager to dump current topology for. | |
2967 | * | |
2968 | * helper to dump MST topology to a seq file for debugfs. | |
2969 | */ | |
2970 | void drm_dp_mst_dump_topology(struct seq_file *m, | |
2971 | struct drm_dp_mst_topology_mgr *mgr) | |
2972 | { | |
2973 | int i; | |
2974 | struct drm_dp_mst_port *port; | |
51108f25 | 2975 | |
ad7f8a1f DA |
2976 | mutex_lock(&mgr->lock); |
2977 | if (mgr->mst_primary) | |
2978 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); | |
2979 | ||
2980 | /* dump VCPIs */ | |
2981 | mutex_unlock(&mgr->lock); | |
2982 | ||
2983 | mutex_lock(&mgr->payload_lock); | |
51108f25 JB |
2984 | seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, |
2985 | mgr->max_payloads); | |
ad7f8a1f DA |
2986 | |
2987 | for (i = 0; i < mgr->max_payloads; i++) { | |
2988 | if (mgr->proposed_vcpis[i]) { | |
51108f25 JB |
2989 | char name[14]; |
2990 | ||
ad7f8a1f | 2991 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
51108f25 JB |
2992 | fetch_monitor_name(mgr, port, name, sizeof(name)); |
2993 | seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, | |
2994 | port->port_num, port->vcpi.vcpi, | |
2995 | port->vcpi.num_slots, | |
2996 | (*name != 0) ? name : "Unknown"); | |
ad7f8a1f | 2997 | } else |
51108f25 | 2998 | seq_printf(m, "vcpi %d:unused\n", i); |
ad7f8a1f DA |
2999 | } |
3000 | for (i = 0; i < mgr->max_payloads; i++) { | |
3001 | seq_printf(m, "payload %d: %d, %d, %d\n", | |
3002 | i, | |
3003 | mgr->payloads[i].payload_state, | |
3004 | mgr->payloads[i].start_slot, | |
3005 | mgr->payloads[i].num_slots); | |
3006 | ||
3007 | ||
3008 | } | |
3009 | mutex_unlock(&mgr->payload_lock); | |
3010 | ||
3011 | mutex_lock(&mgr->lock); | |
3012 | if (mgr->mst_primary) { | |
3013 | u8 buf[64]; | |
ad7f8a1f | 3014 | int ret; |
46466b0d | 3015 | |
ad7f8a1f | 3016 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); |
46466b0d | 3017 | seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); |
ad7f8a1f | 3018 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); |
46466b0d | 3019 | seq_printf(m, "faux/mst: %*ph\n", 2, buf); |
ad7f8a1f | 3020 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); |
46466b0d | 3021 | seq_printf(m, "mst ctrl: %*ph\n", 1, buf); |
ad7f8a1f | 3022 | |
44790462 DA |
3023 | /* dump the standard OUI branch header */ |
3024 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); | |
46466b0d | 3025 | seq_printf(m, "branch oui: %*phN devid: ", 3, buf); |
51108f25 | 3026 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
44790462 | 3027 | seq_printf(m, "%c", buf[i]); |
46466b0d JP |
3028 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", |
3029 | buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); | |
3030 | if (dump_dp_payload_table(mgr, buf)) | |
3031 | seq_printf(m, "payload table: %*ph\n", 63, buf); | |
ad7f8a1f DA |
3032 | |
3033 | } | |
3034 | ||
3035 | mutex_unlock(&mgr->lock); | |
3036 | ||
3037 | } | |
3038 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); | |
3039 | ||
3040 | static void drm_dp_tx_work(struct work_struct *work) | |
3041 | { | |
3042 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); | |
3043 | ||
3044 | mutex_lock(&mgr->qlock); | |
cb021a3e | 3045 | if (!list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
3046 | process_single_down_tx_qlock(mgr); |
3047 | mutex_unlock(&mgr->qlock); | |
3048 | } | |
3049 | ||
91a25e46 ML |
3050 | static void drm_dp_free_mst_port(struct kref *kref) |
3051 | { | |
3052 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); | |
3053 | kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); | |
3054 | kfree(port); | |
3055 | } | |
3056 | ||
6b8eeca6 DA |
3057 | static void drm_dp_destroy_connector_work(struct work_struct *work) |
3058 | { | |
3059 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); | |
4772ff03 | 3060 | struct drm_dp_mst_port *port; |
df4839fd | 3061 | bool send_hotplug = false; |
6b8eeca6 DA |
3062 | /* |
3063 | * Not a regular list traverse as we have to drop the destroy | |
3064 | * connector lock before destroying the connector, to avoid AB->BA | |
3065 | * ordering between this lock and the config mutex. | |
3066 | */ | |
3067 | for (;;) { | |
3068 | mutex_lock(&mgr->destroy_connector_lock); | |
4772ff03 ML |
3069 | port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); |
3070 | if (!port) { | |
6b8eeca6 DA |
3071 | mutex_unlock(&mgr->destroy_connector_lock); |
3072 | break; | |
3073 | } | |
4772ff03 | 3074 | list_del(&port->next); |
6b8eeca6 DA |
3075 | mutex_unlock(&mgr->destroy_connector_lock); |
3076 | ||
91a25e46 ML |
3077 | kref_init(&port->kref); |
3078 | INIT_LIST_HEAD(&port->next); | |
3079 | ||
4772ff03 ML |
3080 | mgr->cbs->destroy_connector(mgr, port->connector); |
3081 | ||
3082 | drm_dp_port_teardown_pdt(port, port->pdt); | |
36e3fa6a | 3083 | port->pdt = DP_PEER_DEVICE_NONE; |
4772ff03 | 3084 | |
91a25e46 | 3085 | if (!port->input && port->vcpi.vcpi > 0) { |
fd2d2bac AG |
3086 | drm_dp_mst_reset_vcpi_slots(mgr, port); |
3087 | drm_dp_update_payload_part1(mgr); | |
3088 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
91a25e46 ML |
3089 | } |
3090 | ||
3091 | kref_put(&port->kref, drm_dp_free_mst_port); | |
df4839fd | 3092 | send_hotplug = true; |
6b8eeca6 | 3093 | } |
df4839fd DA |
3094 | if (send_hotplug) |
3095 | (*mgr->cbs->hotplug)(mgr); | |
6b8eeca6 DA |
3096 | } |
3097 | ||
a4370c77 VS |
3098 | static struct drm_private_state * |
3099 | drm_dp_mst_duplicate_state(struct drm_private_obj *obj) | |
3f3353b7 | 3100 | { |
a4370c77 | 3101 | struct drm_dp_mst_topology_state *state; |
3f3353b7 | 3102 | |
a4370c77 VS |
3103 | state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); |
3104 | if (!state) | |
3f3353b7 PD |
3105 | return NULL; |
3106 | ||
a4370c77 | 3107 | __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); |
3f3353b7 | 3108 | |
a4370c77 | 3109 | return &state->base; |
3f3353b7 PD |
3110 | } |
3111 | ||
a4370c77 VS |
3112 | static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, |
3113 | struct drm_private_state *state) | |
3f3353b7 | 3114 | { |
a4370c77 VS |
3115 | struct drm_dp_mst_topology_state *mst_state = |
3116 | to_dp_mst_topology_state(state); | |
3117 | ||
3118 | kfree(mst_state); | |
3f3353b7 PD |
3119 | } |
3120 | ||
3121 | static const struct drm_private_state_funcs mst_state_funcs = { | |
a4370c77 VS |
3122 | .atomic_duplicate_state = drm_dp_mst_duplicate_state, |
3123 | .atomic_destroy_state = drm_dp_mst_destroy_state, | |
3f3353b7 PD |
3124 | }; |
3125 | ||
3126 | /** | |
3127 | * drm_atomic_get_mst_topology_state: get MST topology state | |
3128 | * | |
3129 | * @state: global atomic state | |
3130 | * @mgr: MST topology manager, also the private object in this case | |
3131 | * | |
3132 | * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic | |
3133 | * state vtable so that the private object state returned is that of a MST | |
3134 | * topology object. Also, drm_atomic_get_private_obj_state() expects the caller | |
3135 | * to care of the locking, so warn if don't hold the connection_mutex. | |
3136 | * | |
3137 | * RETURNS: | |
3138 | * | |
3139 | * The MST topology state or error pointer. | |
3140 | */ | |
3141 | struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, | |
3142 | struct drm_dp_mst_topology_mgr *mgr) | |
3143 | { | |
3144 | struct drm_device *dev = mgr->dev; | |
3145 | ||
3146 | WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); | |
a4370c77 | 3147 | return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base)); |
3f3353b7 PD |
3148 | } |
3149 | EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); | |
3150 | ||
ad7f8a1f DA |
3151 | /** |
3152 | * drm_dp_mst_topology_mgr_init - initialise a topology manager | |
3153 | * @mgr: manager struct to initialise | |
3154 | * @dev: device providing this structure - for i2c addition. | |
3155 | * @aux: DP helper aux channel to talk to this device | |
3156 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit | |
3157 | * @max_payloads: maximum number of payloads this GPU can source | |
3158 | * @conn_base_id: the connector object ID the MST device is connected to. | |
3159 | * | |
3160 | * Return 0 for success, or negative error code on failure | |
3161 | */ | |
3162 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, | |
7b0a89a6 | 3163 | struct drm_device *dev, struct drm_dp_aux *aux, |
ad7f8a1f DA |
3164 | int max_dpcd_transaction_bytes, |
3165 | int max_payloads, int conn_base_id) | |
3166 | { | |
a4370c77 VS |
3167 | struct drm_dp_mst_topology_state *mst_state; |
3168 | ||
ad7f8a1f DA |
3169 | mutex_init(&mgr->lock); |
3170 | mutex_init(&mgr->qlock); | |
3171 | mutex_init(&mgr->payload_lock); | |
6b8eeca6 | 3172 | mutex_init(&mgr->destroy_connector_lock); |
ad7f8a1f | 3173 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
6b8eeca6 | 3174 | INIT_LIST_HEAD(&mgr->destroy_connector_list); |
ad7f8a1f DA |
3175 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
3176 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); | |
6b8eeca6 | 3177 | INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); |
ad7f8a1f DA |
3178 | init_waitqueue_head(&mgr->tx_waitq); |
3179 | mgr->dev = dev; | |
3180 | mgr->aux = aux; | |
3181 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; | |
3182 | mgr->max_payloads = max_payloads; | |
3183 | mgr->conn_base_id = conn_base_id; | |
4d6a10da ID |
3184 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
3185 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) | |
3186 | return -EINVAL; | |
ad7f8a1f DA |
3187 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
3188 | if (!mgr->payloads) | |
3189 | return -ENOMEM; | |
3190 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); | |
3191 | if (!mgr->proposed_vcpis) | |
3192 | return -ENOMEM; | |
3193 | set_bit(0, &mgr->payload_mask); | |
441388a8 ID |
3194 | if (test_calc_pbn_mode() < 0) |
3195 | DRM_ERROR("MST PBN self-test failed\n"); | |
3196 | ||
a4370c77 VS |
3197 | mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL); |
3198 | if (mst_state == NULL) | |
3f3353b7 | 3199 | return -ENOMEM; |
a4370c77 VS |
3200 | |
3201 | mst_state->mgr = mgr; | |
3f3353b7 PD |
3202 | |
3203 | /* max. time slots - one slot for MTP header */ | |
a4370c77 VS |
3204 | mst_state->avail_slots = 63; |
3205 | ||
3206 | drm_atomic_private_obj_init(&mgr->base, | |
3207 | &mst_state->base, | |
3208 | &mst_state_funcs); | |
3f3353b7 | 3209 | |
ad7f8a1f DA |
3210 | return 0; |
3211 | } | |
3212 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); | |
3213 | ||
3214 | /** | |
3215 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. | |
3216 | * @mgr: manager to destroy | |
3217 | */ | |
3218 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) | |
3219 | { | |
274d8352 | 3220 | flush_work(&mgr->work); |
6b8eeca6 | 3221 | flush_work(&mgr->destroy_connector_work); |
ad7f8a1f DA |
3222 | mutex_lock(&mgr->payload_lock); |
3223 | kfree(mgr->payloads); | |
3224 | mgr->payloads = NULL; | |
3225 | kfree(mgr->proposed_vcpis); | |
3226 | mgr->proposed_vcpis = NULL; | |
3227 | mutex_unlock(&mgr->payload_lock); | |
3228 | mgr->dev = NULL; | |
3229 | mgr->aux = NULL; | |
a4370c77 | 3230 | drm_atomic_private_obj_fini(&mgr->base); |
3f3353b7 | 3231 | mgr->funcs = NULL; |
ad7f8a1f DA |
3232 | } |
3233 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); | |
3234 | ||
3235 | /* I2C device */ | |
3236 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, | |
3237 | int num) | |
3238 | { | |
3239 | struct drm_dp_aux *aux = adapter->algo_data; | |
3240 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); | |
3241 | struct drm_dp_mst_branch *mstb; | |
3242 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
3243 | unsigned int i; | |
3244 | bool reading = false; | |
3245 | struct drm_dp_sideband_msg_req_body msg; | |
3246 | struct drm_dp_sideband_msg_tx *txmsg = NULL; | |
3247 | int ret; | |
3248 | ||
3249 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
3250 | if (!mstb) | |
3251 | return -EREMOTEIO; | |
3252 | ||
3253 | /* construct i2c msg */ | |
3254 | /* see if last msg is a read */ | |
3255 | if (msgs[num - 1].flags & I2C_M_RD) | |
3256 | reading = true; | |
3257 | ||
ae491542 | 3258 | if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { |
ad7f8a1f DA |
3259 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
3260 | ret = -EIO; | |
3261 | goto out; | |
3262 | } | |
3263 | ||
ae491542 | 3264 | memset(&msg, 0, sizeof(msg)); |
ad7f8a1f DA |
3265 | msg.req_type = DP_REMOTE_I2C_READ; |
3266 | msg.u.i2c_read.num_transactions = num - 1; | |
3267 | msg.u.i2c_read.port_number = port->port_num; | |
3268 | for (i = 0; i < num - 1; i++) { | |
3269 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; | |
3270 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; | |
3271 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; | |
3272 | } | |
3273 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; | |
3274 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; | |
3275 | ||
3276 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3277 | if (!txmsg) { | |
3278 | ret = -ENOMEM; | |
3279 | goto out; | |
3280 | } | |
3281 | ||
3282 | txmsg->dst = mstb; | |
3283 | drm_dp_encode_sideband_req(&msg, txmsg); | |
3284 | ||
3285 | drm_dp_queue_down_tx(mgr, txmsg); | |
3286 | ||
3287 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
3288 | if (ret > 0) { | |
3289 | ||
3290 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ | |
3291 | ret = -EREMOTEIO; | |
3292 | goto out; | |
3293 | } | |
3294 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { | |
3295 | ret = -EIO; | |
3296 | goto out; | |
3297 | } | |
3298 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); | |
3299 | ret = num; | |
3300 | } | |
3301 | out: | |
3302 | kfree(txmsg); | |
3303 | drm_dp_put_mst_branch_device(mstb); | |
3304 | return ret; | |
3305 | } | |
3306 | ||
3307 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) | |
3308 | { | |
3309 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | | |
3310 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | | |
3311 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | | |
3312 | I2C_FUNC_10BIT_ADDR; | |
3313 | } | |
3314 | ||
3315 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { | |
3316 | .functionality = drm_dp_mst_i2c_functionality, | |
3317 | .master_xfer = drm_dp_mst_i2c_xfer, | |
3318 | }; | |
3319 | ||
3320 | /** | |
3321 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX | |
3322 | * @aux: DisplayPort AUX channel | |
3323 | * | |
3324 | * Returns 0 on success or a negative error code on failure. | |
3325 | */ | |
3326 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) | |
3327 | { | |
3328 | aux->ddc.algo = &drm_dp_mst_i2c_algo; | |
3329 | aux->ddc.algo_data = aux; | |
3330 | aux->ddc.retries = 3; | |
3331 | ||
3332 | aux->ddc.class = I2C_CLASS_DDC; | |
3333 | aux->ddc.owner = THIS_MODULE; | |
3334 | aux->ddc.dev.parent = aux->dev; | |
3335 | aux->ddc.dev.of_node = aux->dev->of_node; | |
3336 | ||
3337 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), | |
3338 | sizeof(aux->ddc.name)); | |
3339 | ||
3340 | return i2c_add_adapter(&aux->ddc); | |
3341 | } | |
3342 | ||
3343 | /** | |
3344 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter | |
3345 | * @aux: DisplayPort AUX channel | |
3346 | */ | |
3347 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) | |
3348 | { | |
3349 | i2c_del_adapter(&aux->ddc); | |
3350 | } |