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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> | |
34 | ||
35 | /** | |
36 | * DOC: dp mst helper | |
37 | * | |
38 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport | |
39 | * protocol. The helpers contain a topology manager and bandwidth manager. | |
40 | * The helpers encapsulate the sending and received of sideband msgs. | |
41 | */ | |
42 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
43 | char *buf); | |
44 | static int test_calc_pbn_mode(void); | |
45 | ||
46 | static void drm_dp_put_port(struct drm_dp_mst_port *port); | |
47 | ||
48 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
49 | int id, | |
50 | struct drm_dp_payload *payload); | |
51 | ||
52 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
53 | struct drm_dp_mst_port *port, | |
54 | int offset, int size, u8 *bytes); | |
55 | ||
56 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, | |
57 | struct drm_dp_mst_branch *mstb); | |
58 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, | |
59 | struct drm_dp_mst_branch *mstb, | |
60 | struct drm_dp_mst_port *port); | |
61 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
62 | u8 *guid); | |
63 | ||
64 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); | |
65 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); | |
66 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); | |
67 | /* sideband msg handling */ | |
68 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) | |
69 | { | |
70 | u8 bitmask = 0x80; | |
71 | u8 bitshift = 7; | |
72 | u8 array_index = 0; | |
73 | int number_of_bits = num_nibbles * 4; | |
74 | u8 remainder = 0; | |
75 | ||
76 | while (number_of_bits != 0) { | |
77 | number_of_bits--; | |
78 | remainder <<= 1; | |
79 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
80 | bitmask >>= 1; | |
81 | bitshift--; | |
82 | if (bitmask == 0) { | |
83 | bitmask = 0x80; | |
84 | bitshift = 7; | |
85 | array_index++; | |
86 | } | |
87 | if ((remainder & 0x10) == 0x10) | |
88 | remainder ^= 0x13; | |
89 | } | |
90 | ||
91 | number_of_bits = 4; | |
92 | while (number_of_bits != 0) { | |
93 | number_of_bits--; | |
94 | remainder <<= 1; | |
95 | if ((remainder & 0x10) != 0) | |
96 | remainder ^= 0x13; | |
97 | } | |
98 | ||
99 | return remainder; | |
100 | } | |
101 | ||
102 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) | |
103 | { | |
104 | u8 bitmask = 0x80; | |
105 | u8 bitshift = 7; | |
106 | u8 array_index = 0; | |
107 | int number_of_bits = number_of_bytes * 8; | |
108 | u16 remainder = 0; | |
109 | ||
110 | while (number_of_bits != 0) { | |
111 | number_of_bits--; | |
112 | remainder <<= 1; | |
113 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
114 | bitmask >>= 1; | |
115 | bitshift--; | |
116 | if (bitmask == 0) { | |
117 | bitmask = 0x80; | |
118 | bitshift = 7; | |
119 | array_index++; | |
120 | } | |
121 | if ((remainder & 0x100) == 0x100) | |
122 | remainder ^= 0xd5; | |
123 | } | |
124 | ||
125 | number_of_bits = 8; | |
126 | while (number_of_bits != 0) { | |
127 | number_of_bits--; | |
128 | remainder <<= 1; | |
129 | if ((remainder & 0x100) != 0) | |
130 | remainder ^= 0xd5; | |
131 | } | |
132 | ||
133 | return remainder & 0xff; | |
134 | } | |
135 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) | |
136 | { | |
137 | u8 size = 3; | |
138 | size += (hdr->lct / 2); | |
139 | return size; | |
140 | } | |
141 | ||
142 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
143 | u8 *buf, int *len) | |
144 | { | |
145 | int idx = 0; | |
146 | int i; | |
147 | u8 crc4; | |
148 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); | |
149 | for (i = 0; i < (hdr->lct / 2); i++) | |
150 | buf[idx++] = hdr->rad[i]; | |
151 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | | |
152 | (hdr->msg_len & 0x3f); | |
153 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); | |
154 | ||
155 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); | |
156 | buf[idx - 1] |= (crc4 & 0xf); | |
157 | ||
158 | *len = idx; | |
159 | } | |
160 | ||
161 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
162 | u8 *buf, int buflen, u8 *hdrlen) | |
163 | { | |
164 | u8 crc4; | |
165 | u8 len; | |
166 | int i; | |
167 | u8 idx; | |
168 | if (buf[0] == 0) | |
169 | return false; | |
170 | len = 3; | |
171 | len += ((buf[0] & 0xf0) >> 4) / 2; | |
172 | if (len > buflen) | |
173 | return false; | |
174 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); | |
175 | ||
176 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { | |
177 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); | |
178 | return false; | |
179 | } | |
180 | ||
181 | hdr->lct = (buf[0] & 0xf0) >> 4; | |
182 | hdr->lcr = (buf[0] & 0xf); | |
183 | idx = 1; | |
184 | for (i = 0; i < (hdr->lct / 2); i++) | |
185 | hdr->rad[i] = buf[idx++]; | |
186 | hdr->broadcast = (buf[idx] >> 7) & 0x1; | |
187 | hdr->path_msg = (buf[idx] >> 6) & 0x1; | |
188 | hdr->msg_len = buf[idx] & 0x3f; | |
189 | idx++; | |
190 | hdr->somt = (buf[idx] >> 7) & 0x1; | |
191 | hdr->eomt = (buf[idx] >> 6) & 0x1; | |
192 | hdr->seqno = (buf[idx] >> 4) & 0x1; | |
193 | idx++; | |
194 | *hdrlen = idx; | |
195 | return true; | |
196 | } | |
197 | ||
198 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, | |
199 | struct drm_dp_sideband_msg_tx *raw) | |
200 | { | |
201 | int idx = 0; | |
202 | int i; | |
203 | u8 *buf = raw->msg; | |
204 | buf[idx++] = req->req_type & 0x7f; | |
205 | ||
206 | switch (req->req_type) { | |
207 | case DP_ENUM_PATH_RESOURCES: | |
208 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; | |
209 | idx++; | |
210 | break; | |
211 | case DP_ALLOCATE_PAYLOAD: | |
212 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | | |
213 | (req->u.allocate_payload.number_sdp_streams & 0xf); | |
214 | idx++; | |
215 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); | |
216 | idx++; | |
217 | buf[idx] = (req->u.allocate_payload.pbn >> 8); | |
218 | idx++; | |
219 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); | |
220 | idx++; | |
221 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { | |
222 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | | |
223 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); | |
224 | idx++; | |
225 | } | |
226 | if (req->u.allocate_payload.number_sdp_streams & 1) { | |
227 | i = req->u.allocate_payload.number_sdp_streams - 1; | |
228 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; | |
229 | idx++; | |
230 | } | |
231 | break; | |
232 | case DP_QUERY_PAYLOAD: | |
233 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; | |
234 | idx++; | |
235 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); | |
236 | idx++; | |
237 | break; | |
238 | case DP_REMOTE_DPCD_READ: | |
239 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; | |
240 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; | |
241 | idx++; | |
242 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; | |
243 | idx++; | |
244 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); | |
245 | idx++; | |
246 | buf[idx] = (req->u.dpcd_read.num_bytes); | |
247 | idx++; | |
248 | break; | |
249 | ||
250 | case DP_REMOTE_DPCD_WRITE: | |
251 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; | |
252 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; | |
253 | idx++; | |
254 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; | |
255 | idx++; | |
256 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); | |
257 | idx++; | |
258 | buf[idx] = (req->u.dpcd_write.num_bytes); | |
259 | idx++; | |
260 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); | |
261 | idx += req->u.dpcd_write.num_bytes; | |
262 | break; | |
263 | case DP_REMOTE_I2C_READ: | |
264 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; | |
265 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); | |
266 | idx++; | |
267 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { | |
268 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; | |
269 | idx++; | |
270 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; | |
271 | idx++; | |
272 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); | |
273 | idx += req->u.i2c_read.transactions[i].num_bytes; | |
274 | ||
275 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; | |
276 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); | |
277 | idx++; | |
278 | } | |
279 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; | |
280 | idx++; | |
281 | buf[idx] = (req->u.i2c_read.num_bytes_read); | |
282 | idx++; | |
283 | break; | |
284 | ||
285 | case DP_REMOTE_I2C_WRITE: | |
286 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; | |
287 | idx++; | |
288 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; | |
289 | idx++; | |
290 | buf[idx] = (req->u.i2c_write.num_bytes); | |
291 | idx++; | |
292 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); | |
293 | idx += req->u.i2c_write.num_bytes; | |
294 | break; | |
295 | } | |
296 | raw->cur_len = idx; | |
297 | } | |
298 | ||
299 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) | |
300 | { | |
301 | u8 crc4; | |
302 | crc4 = drm_dp_msg_data_crc4(msg, len); | |
303 | msg[len] = crc4; | |
304 | } | |
305 | ||
306 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, | |
307 | struct drm_dp_sideband_msg_tx *raw) | |
308 | { | |
309 | int idx = 0; | |
310 | u8 *buf = raw->msg; | |
311 | ||
312 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); | |
313 | ||
314 | raw->cur_len = idx; | |
315 | } | |
316 | ||
317 | /* this adds a chunk of msg to the builder to get the final msg */ | |
318 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, | |
319 | u8 *replybuf, u8 replybuflen, bool hdr) | |
320 | { | |
321 | int ret; | |
322 | u8 crc4; | |
323 | ||
324 | if (hdr) { | |
325 | u8 hdrlen; | |
326 | struct drm_dp_sideband_msg_hdr recv_hdr; | |
327 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); | |
328 | if (ret == false) { | |
329 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); | |
330 | return false; | |
331 | } | |
332 | ||
333 | /* get length contained in this portion */ | |
334 | msg->curchunk_len = recv_hdr.msg_len; | |
335 | msg->curchunk_hdrlen = hdrlen; | |
336 | ||
337 | /* we have already gotten an somt - don't bother parsing */ | |
338 | if (recv_hdr.somt && msg->have_somt) | |
339 | return false; | |
340 | ||
341 | if (recv_hdr.somt) { | |
342 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); | |
343 | msg->have_somt = true; | |
344 | } | |
345 | if (recv_hdr.eomt) | |
346 | msg->have_eomt = true; | |
347 | ||
348 | /* copy the bytes for the remainder of this header chunk */ | |
349 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); | |
350 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); | |
351 | } else { | |
352 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); | |
353 | msg->curchunk_idx += replybuflen; | |
354 | } | |
355 | ||
356 | if (msg->curchunk_idx >= msg->curchunk_len) { | |
357 | /* do CRC */ | |
358 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); | |
359 | /* copy chunk into bigger msg */ | |
360 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); | |
361 | msg->curlen += msg->curchunk_len - 1; | |
362 | } | |
363 | return true; | |
364 | } | |
365 | ||
366 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, | |
367 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
368 | { | |
369 | int idx = 1; | |
370 | int i; | |
371 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); | |
372 | idx += 16; | |
373 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; | |
374 | idx++; | |
375 | if (idx > raw->curlen) | |
376 | goto fail_len; | |
377 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { | |
378 | if (raw->msg[idx] & 0x80) | |
379 | repmsg->u.link_addr.ports[i].input_port = 1; | |
380 | ||
381 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; | |
382 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); | |
383 | ||
384 | idx++; | |
385 | if (idx > raw->curlen) | |
386 | goto fail_len; | |
387 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; | |
388 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; | |
389 | if (repmsg->u.link_addr.ports[i].input_port == 0) | |
390 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
391 | idx++; | |
392 | if (idx > raw->curlen) | |
393 | goto fail_len; | |
394 | if (repmsg->u.link_addr.ports[i].input_port == 0) { | |
395 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); | |
396 | idx++; | |
397 | if (idx > raw->curlen) | |
398 | goto fail_len; | |
399 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); | |
400 | idx += 16; | |
401 | if (idx > raw->curlen) | |
402 | goto fail_len; | |
403 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; | |
404 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); | |
405 | idx++; | |
406 | ||
407 | } | |
408 | if (idx > raw->curlen) | |
409 | goto fail_len; | |
410 | } | |
411 | ||
412 | return true; | |
413 | fail_len: | |
414 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
415 | return false; | |
416 | } | |
417 | ||
418 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, | |
419 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
420 | { | |
421 | int idx = 1; | |
422 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; | |
423 | idx++; | |
424 | if (idx > raw->curlen) | |
425 | goto fail_len; | |
426 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; | |
427 | if (idx > raw->curlen) | |
428 | goto fail_len; | |
429 | ||
430 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); | |
431 | return true; | |
432 | fail_len: | |
433 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
434 | return false; | |
435 | } | |
436 | ||
437 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, | |
438 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
439 | { | |
440 | int idx = 1; | |
441 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; | |
442 | idx++; | |
443 | if (idx > raw->curlen) | |
444 | goto fail_len; | |
445 | return true; | |
446 | fail_len: | |
447 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); | |
448 | return false; | |
449 | } | |
450 | ||
451 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, | |
452 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
453 | { | |
454 | int idx = 1; | |
455 | ||
456 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); | |
457 | idx++; | |
458 | if (idx > raw->curlen) | |
459 | goto fail_len; | |
460 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; | |
461 | idx++; | |
462 | /* TODO check */ | |
463 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); | |
464 | return true; | |
465 | fail_len: | |
466 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); | |
467 | return false; | |
468 | } | |
469 | ||
470 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, | |
471 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
472 | { | |
473 | int idx = 1; | |
474 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; | |
475 | idx++; | |
476 | if (idx > raw->curlen) | |
477 | goto fail_len; | |
478 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
479 | idx += 2; | |
480 | if (idx > raw->curlen) | |
481 | goto fail_len; | |
482 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
483 | idx += 2; | |
484 | if (idx > raw->curlen) | |
485 | goto fail_len; | |
486 | return true; | |
487 | fail_len: | |
488 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); | |
489 | return false; | |
490 | } | |
491 | ||
492 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
493 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
494 | { | |
495 | int idx = 1; | |
496 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
497 | idx++; | |
498 | if (idx > raw->curlen) | |
499 | goto fail_len; | |
500 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; | |
501 | idx++; | |
502 | if (idx > raw->curlen) | |
503 | goto fail_len; | |
504 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
505 | idx += 2; | |
506 | if (idx > raw->curlen) | |
507 | goto fail_len; | |
508 | return true; | |
509 | fail_len: | |
510 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); | |
511 | return false; | |
512 | } | |
513 | ||
514 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
515 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
516 | { | |
517 | int idx = 1; | |
518 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
519 | idx++; | |
520 | if (idx > raw->curlen) | |
521 | goto fail_len; | |
522 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
523 | idx += 2; | |
524 | if (idx > raw->curlen) | |
525 | goto fail_len; | |
526 | return true; | |
527 | fail_len: | |
528 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); | |
529 | return false; | |
530 | } | |
531 | ||
532 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, | |
533 | struct drm_dp_sideband_msg_reply_body *msg) | |
534 | { | |
535 | memset(msg, 0, sizeof(*msg)); | |
536 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; | |
537 | msg->req_type = (raw->msg[0] & 0x7f); | |
538 | ||
539 | if (msg->reply_type) { | |
540 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); | |
541 | msg->u.nak.reason = raw->msg[17]; | |
542 | msg->u.nak.nak_data = raw->msg[18]; | |
543 | return false; | |
544 | } | |
545 | ||
546 | switch (msg->req_type) { | |
547 | case DP_LINK_ADDRESS: | |
548 | return drm_dp_sideband_parse_link_address(raw, msg); | |
549 | case DP_QUERY_PAYLOAD: | |
550 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); | |
551 | case DP_REMOTE_DPCD_READ: | |
552 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); | |
553 | case DP_REMOTE_DPCD_WRITE: | |
554 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); | |
555 | case DP_REMOTE_I2C_READ: | |
556 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); | |
557 | case DP_ENUM_PATH_RESOURCES: | |
558 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); | |
559 | case DP_ALLOCATE_PAYLOAD: | |
560 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); | |
561 | default: | |
562 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); | |
563 | return false; | |
564 | } | |
565 | } | |
566 | ||
567 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
568 | struct drm_dp_sideband_msg_req_body *msg) | |
569 | { | |
570 | int idx = 1; | |
571 | ||
572 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
573 | idx++; | |
574 | if (idx > raw->curlen) | |
575 | goto fail_len; | |
576 | ||
577 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); | |
578 | idx += 16; | |
579 | if (idx > raw->curlen) | |
580 | goto fail_len; | |
581 | ||
582 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; | |
583 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
584 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; | |
585 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; | |
586 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); | |
587 | idx++; | |
588 | return true; | |
589 | fail_len: | |
590 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); | |
591 | return false; | |
592 | } | |
593 | ||
594 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
595 | struct drm_dp_sideband_msg_req_body *msg) | |
596 | { | |
597 | int idx = 1; | |
598 | ||
599 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
600 | idx++; | |
601 | if (idx > raw->curlen) | |
602 | goto fail_len; | |
603 | ||
604 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); | |
605 | idx += 16; | |
606 | if (idx > raw->curlen) | |
607 | goto fail_len; | |
608 | ||
609 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
610 | idx++; | |
611 | return true; | |
612 | fail_len: | |
613 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); | |
614 | return false; | |
615 | } | |
616 | ||
617 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, | |
618 | struct drm_dp_sideband_msg_req_body *msg) | |
619 | { | |
620 | memset(msg, 0, sizeof(*msg)); | |
621 | msg->req_type = (raw->msg[0] & 0x7f); | |
622 | ||
623 | switch (msg->req_type) { | |
624 | case DP_CONNECTION_STATUS_NOTIFY: | |
625 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); | |
626 | case DP_RESOURCE_STATUS_NOTIFY: | |
627 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); | |
628 | default: | |
629 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); | |
630 | return false; | |
631 | } | |
632 | } | |
633 | ||
634 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) | |
635 | { | |
636 | struct drm_dp_sideband_msg_req_body req; | |
637 | ||
638 | req.req_type = DP_REMOTE_DPCD_WRITE; | |
639 | req.u.dpcd_write.port_number = port_num; | |
640 | req.u.dpcd_write.dpcd_address = offset; | |
641 | req.u.dpcd_write.num_bytes = num_bytes; | |
642 | req.u.dpcd_write.bytes = bytes; | |
643 | drm_dp_encode_sideband_req(&req, msg); | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) | |
649 | { | |
650 | struct drm_dp_sideband_msg_req_body req; | |
651 | ||
652 | req.req_type = DP_LINK_ADDRESS; | |
653 | drm_dp_encode_sideband_req(&req, msg); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) | |
658 | { | |
659 | struct drm_dp_sideband_msg_req_body req; | |
660 | ||
661 | req.req_type = DP_ENUM_PATH_RESOURCES; | |
662 | req.u.port_num.port_number = port_num; | |
663 | drm_dp_encode_sideband_req(&req, msg); | |
664 | msg->path_msg = true; | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, | |
669 | u8 vcpi, uint16_t pbn) | |
670 | { | |
671 | struct drm_dp_sideband_msg_req_body req; | |
672 | memset(&req, 0, sizeof(req)); | |
673 | req.req_type = DP_ALLOCATE_PAYLOAD; | |
674 | req.u.allocate_payload.port_number = port_num; | |
675 | req.u.allocate_payload.vcpi = vcpi; | |
676 | req.u.allocate_payload.pbn = pbn; | |
677 | drm_dp_encode_sideband_req(&req, msg); | |
678 | msg->path_msg = true; | |
679 | return 0; | |
680 | } | |
681 | ||
682 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
683 | struct drm_dp_vcpi *vcpi) | |
684 | { | |
dfda0df3 | 685 | int ret, vcpi_ret; |
ad7f8a1f DA |
686 | |
687 | mutex_lock(&mgr->payload_lock); | |
688 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); | |
689 | if (ret > mgr->max_payloads) { | |
690 | ret = -EINVAL; | |
691 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); | |
692 | goto out_unlock; | |
693 | } | |
694 | ||
dfda0df3 DA |
695 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
696 | if (vcpi_ret > mgr->max_payloads) { | |
697 | ret = -EINVAL; | |
698 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); | |
699 | goto out_unlock; | |
700 | } | |
701 | ||
ad7f8a1f | 702 | set_bit(ret, &mgr->payload_mask); |
dfda0df3 DA |
703 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
704 | vcpi->vcpi = vcpi_ret + 1; | |
ad7f8a1f DA |
705 | mgr->proposed_vcpis[ret - 1] = vcpi; |
706 | out_unlock: | |
707 | mutex_unlock(&mgr->payload_lock); | |
708 | return ret; | |
709 | } | |
710 | ||
711 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
dfda0df3 | 712 | int vcpi) |
ad7f8a1f | 713 | { |
dfda0df3 DA |
714 | int i; |
715 | if (vcpi == 0) | |
ad7f8a1f DA |
716 | return; |
717 | ||
718 | mutex_lock(&mgr->payload_lock); | |
dfda0df3 DA |
719 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
720 | clear_bit(vcpi - 1, &mgr->vcpi_mask); | |
721 | ||
722 | for (i = 0; i < mgr->max_payloads; i++) { | |
723 | if (mgr->proposed_vcpis[i]) | |
724 | if (mgr->proposed_vcpis[i]->vcpi == vcpi) { | |
725 | mgr->proposed_vcpis[i] = NULL; | |
726 | clear_bit(i + 1, &mgr->payload_mask); | |
727 | } | |
728 | } | |
ad7f8a1f DA |
729 | mutex_unlock(&mgr->payload_lock); |
730 | } | |
731 | ||
732 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, | |
733 | struct drm_dp_sideband_msg_tx *txmsg) | |
734 | { | |
735 | bool ret; | |
736 | mutex_lock(&mgr->qlock); | |
737 | ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || | |
738 | txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); | |
739 | mutex_unlock(&mgr->qlock); | |
740 | return ret; | |
741 | } | |
742 | ||
743 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, | |
744 | struct drm_dp_sideband_msg_tx *txmsg) | |
745 | { | |
746 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
747 | int ret; | |
748 | ||
749 | ret = wait_event_timeout(mgr->tx_waitq, | |
750 | check_txmsg_state(mgr, txmsg), | |
751 | (4 * HZ)); | |
752 | mutex_lock(&mstb->mgr->qlock); | |
753 | if (ret > 0) { | |
754 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { | |
755 | ret = -EIO; | |
756 | goto out; | |
757 | } | |
758 | } else { | |
759 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); | |
760 | ||
761 | /* dump some state */ | |
762 | ret = -EIO; | |
763 | ||
764 | /* remove from q */ | |
765 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || | |
766 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { | |
767 | list_del(&txmsg->next); | |
768 | } | |
769 | ||
770 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || | |
771 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { | |
772 | mstb->tx_slots[txmsg->seqno] = NULL; | |
773 | } | |
774 | } | |
775 | out: | |
776 | mutex_unlock(&mgr->qlock); | |
777 | ||
778 | return ret; | |
779 | } | |
780 | ||
781 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) | |
782 | { | |
783 | struct drm_dp_mst_branch *mstb; | |
784 | ||
785 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); | |
786 | if (!mstb) | |
787 | return NULL; | |
788 | ||
789 | mstb->lct = lct; | |
790 | if (lct > 1) | |
791 | memcpy(mstb->rad, rad, lct / 2); | |
792 | INIT_LIST_HEAD(&mstb->ports); | |
793 | kref_init(&mstb->kref); | |
794 | return mstb; | |
795 | } | |
796 | ||
797 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) | |
798 | { | |
799 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); | |
800 | struct drm_dp_mst_port *port, *tmp; | |
801 | bool wake_tx = false; | |
802 | ||
803 | cancel_work_sync(&mstb->mgr->work); | |
804 | ||
805 | /* | |
806 | * destroy all ports - don't need lock | |
807 | * as there are no more references to the mst branch | |
808 | * device at this point. | |
809 | */ | |
810 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { | |
811 | list_del(&port->next); | |
812 | drm_dp_put_port(port); | |
813 | } | |
814 | ||
815 | /* drop any tx slots msg */ | |
816 | mutex_lock(&mstb->mgr->qlock); | |
817 | if (mstb->tx_slots[0]) { | |
818 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
819 | mstb->tx_slots[0] = NULL; | |
820 | wake_tx = true; | |
821 | } | |
822 | if (mstb->tx_slots[1]) { | |
823 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
824 | mstb->tx_slots[1] = NULL; | |
825 | wake_tx = true; | |
826 | } | |
827 | mutex_unlock(&mstb->mgr->qlock); | |
828 | ||
829 | if (wake_tx) | |
830 | wake_up(&mstb->mgr->tx_waitq); | |
831 | kfree(mstb); | |
832 | } | |
833 | ||
834 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) | |
835 | { | |
836 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); | |
837 | } | |
838 | ||
839 | ||
840 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) | |
841 | { | |
842 | switch (old_pdt) { | |
843 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
844 | case DP_PEER_DEVICE_SST_SINK: | |
845 | /* remove i2c over sideband */ | |
846 | drm_dp_mst_unregister_i2c_bus(&port->aux); | |
847 | break; | |
848 | case DP_PEER_DEVICE_MST_BRANCHING: | |
849 | drm_dp_put_mst_branch_device(port->mstb); | |
850 | port->mstb = NULL; | |
851 | break; | |
852 | } | |
853 | } | |
854 | ||
855 | static void drm_dp_destroy_port(struct kref *kref) | |
856 | { | |
857 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); | |
858 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
859 | if (!port->input) { | |
860 | port->vcpi.num_slots = 0; | |
861 | if (port->connector) | |
862 | (*port->mgr->cbs->destroy_connector)(mgr, port->connector); | |
863 | drm_dp_port_teardown_pdt(port, port->pdt); | |
864 | ||
865 | if (!port->input && port->vcpi.vcpi > 0) | |
866 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
867 | } | |
868 | kfree(port); | |
869 | ||
870 | (*mgr->cbs->hotplug)(mgr); | |
871 | } | |
872 | ||
873 | static void drm_dp_put_port(struct drm_dp_mst_port *port) | |
874 | { | |
875 | kref_put(&port->kref, drm_dp_destroy_port); | |
876 | } | |
877 | ||
878 | 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) | |
879 | { | |
880 | struct drm_dp_mst_port *port; | |
881 | struct drm_dp_mst_branch *rmstb; | |
882 | if (to_find == mstb) { | |
883 | kref_get(&mstb->kref); | |
884 | return mstb; | |
885 | } | |
886 | list_for_each_entry(port, &mstb->ports, next) { | |
887 | if (port->mstb) { | |
888 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); | |
889 | if (rmstb) | |
890 | return rmstb; | |
891 | } | |
892 | } | |
893 | return NULL; | |
894 | } | |
895 | ||
896 | 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) | |
897 | { | |
898 | struct drm_dp_mst_branch *rmstb = NULL; | |
899 | mutex_lock(&mgr->lock); | |
900 | if (mgr->mst_primary) | |
901 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); | |
902 | mutex_unlock(&mgr->lock); | |
903 | return rmstb; | |
904 | } | |
905 | ||
906 | 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) | |
907 | { | |
908 | struct drm_dp_mst_port *port, *mport; | |
909 | ||
910 | list_for_each_entry(port, &mstb->ports, next) { | |
911 | if (port == to_find) { | |
912 | kref_get(&port->kref); | |
913 | return port; | |
914 | } | |
915 | if (port->mstb) { | |
916 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); | |
917 | if (mport) | |
918 | return mport; | |
919 | } | |
920 | } | |
921 | return NULL; | |
922 | } | |
923 | ||
924 | 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) | |
925 | { | |
926 | struct drm_dp_mst_port *rport = NULL; | |
927 | mutex_lock(&mgr->lock); | |
928 | if (mgr->mst_primary) | |
929 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); | |
930 | mutex_unlock(&mgr->lock); | |
931 | return rport; | |
932 | } | |
933 | ||
934 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) | |
935 | { | |
936 | struct drm_dp_mst_port *port; | |
937 | ||
938 | list_for_each_entry(port, &mstb->ports, next) { | |
939 | if (port->port_num == port_num) { | |
940 | kref_get(&port->kref); | |
941 | return port; | |
942 | } | |
943 | } | |
944 | ||
945 | return NULL; | |
946 | } | |
947 | ||
948 | /* | |
949 | * calculate a new RAD for this MST branch device | |
950 | * if parent has an LCT of 2 then it has 1 nibble of RAD, | |
951 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, | |
952 | */ | |
953 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, | |
954 | u8 *rad) | |
955 | { | |
956 | int lct = port->parent->lct; | |
957 | int shift = 4; | |
958 | int idx = lct / 2; | |
959 | if (lct > 1) { | |
960 | memcpy(rad, port->parent->rad, idx); | |
961 | shift = (lct % 2) ? 4 : 0; | |
962 | } else | |
963 | rad[0] = 0; | |
964 | ||
965 | rad[idx] |= port->port_num << shift; | |
966 | return lct + 1; | |
967 | } | |
968 | ||
969 | /* | |
970 | * return sends link address for new mstb | |
971 | */ | |
972 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) | |
973 | { | |
974 | int ret; | |
975 | u8 rad[6], lct; | |
976 | bool send_link = false; | |
977 | switch (port->pdt) { | |
978 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
979 | case DP_PEER_DEVICE_SST_SINK: | |
980 | /* add i2c over sideband */ | |
981 | ret = drm_dp_mst_register_i2c_bus(&port->aux); | |
982 | break; | |
983 | case DP_PEER_DEVICE_MST_BRANCHING: | |
984 | lct = drm_dp_calculate_rad(port, rad); | |
985 | ||
986 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); | |
987 | port->mstb->mgr = port->mgr; | |
988 | port->mstb->port_parent = port; | |
989 | ||
990 | send_link = true; | |
991 | break; | |
992 | } | |
993 | return send_link; | |
994 | } | |
995 | ||
996 | static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb, | |
997 | struct drm_dp_mst_port *port) | |
998 | { | |
999 | int ret; | |
1000 | if (port->dpcd_rev >= 0x12) { | |
1001 | port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid); | |
1002 | if (!port->guid_valid) { | |
1003 | ret = drm_dp_send_dpcd_write(mstb->mgr, | |
1004 | port, | |
1005 | DP_GUID, | |
1006 | 16, port->guid); | |
1007 | port->guid_valid = true; | |
1008 | } | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | static void build_mst_prop_path(struct drm_dp_mst_port *port, | |
1013 | struct drm_dp_mst_branch *mstb, | |
1014 | char *proppath) | |
1015 | { | |
1016 | int i; | |
1017 | char temp[8]; | |
1018 | snprintf(proppath, 255, "mst:%d", mstb->mgr->conn_base_id); | |
1019 | for (i = 0; i < (mstb->lct - 1); i++) { | |
1020 | int shift = (i % 2) ? 0 : 4; | |
1021 | int port_num = mstb->rad[i / 2] >> shift; | |
1022 | snprintf(temp, 8, "-%d", port_num); | |
1023 | strncat(proppath, temp, 255); | |
1024 | } | |
1025 | snprintf(temp, 8, "-%d", port->port_num); | |
1026 | strncat(proppath, temp, 255); | |
1027 | } | |
1028 | ||
1029 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, | |
1030 | struct device *dev, | |
1031 | struct drm_dp_link_addr_reply_port *port_msg) | |
1032 | { | |
1033 | struct drm_dp_mst_port *port; | |
1034 | bool ret; | |
1035 | bool created = false; | |
1036 | int old_pdt = 0; | |
1037 | int old_ddps = 0; | |
1038 | port = drm_dp_get_port(mstb, port_msg->port_number); | |
1039 | if (!port) { | |
1040 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
1041 | if (!port) | |
1042 | return; | |
1043 | kref_init(&port->kref); | |
1044 | port->parent = mstb; | |
1045 | port->port_num = port_msg->port_number; | |
1046 | port->mgr = mstb->mgr; | |
1047 | port->aux.name = "DPMST"; | |
1048 | port->aux.dev = dev; | |
1049 | created = true; | |
1050 | } else { | |
1051 | old_pdt = port->pdt; | |
1052 | old_ddps = port->ddps; | |
1053 | } | |
1054 | ||
1055 | port->pdt = port_msg->peer_device_type; | |
1056 | port->input = port_msg->input_port; | |
1057 | port->mcs = port_msg->mcs; | |
1058 | port->ddps = port_msg->ddps; | |
1059 | port->ldps = port_msg->legacy_device_plug_status; | |
1060 | port->dpcd_rev = port_msg->dpcd_revision; | |
1061 | port->num_sdp_streams = port_msg->num_sdp_streams; | |
1062 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; | |
1063 | memcpy(port->guid, port_msg->peer_guid, 16); | |
1064 | ||
1065 | /* manage mstb port lists with mgr lock - take a reference | |
1066 | for this list */ | |
1067 | if (created) { | |
1068 | mutex_lock(&mstb->mgr->lock); | |
1069 | kref_get(&port->kref); | |
1070 | list_add(&port->next, &mstb->ports); | |
1071 | mutex_unlock(&mstb->mgr->lock); | |
1072 | } | |
1073 | ||
1074 | if (old_ddps != port->ddps) { | |
1075 | if (port->ddps) { | |
1076 | drm_dp_check_port_guid(mstb, port); | |
1077 | if (!port->input) | |
1078 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); | |
1079 | } else { | |
1080 | port->guid_valid = false; | |
1081 | port->available_pbn = 0; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | if (old_pdt != port->pdt && !port->input) { | |
1086 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1087 | ||
1088 | ret = drm_dp_port_setup_pdt(port); | |
1089 | if (ret == true) { | |
1090 | drm_dp_send_link_address(mstb->mgr, port->mstb); | |
1091 | port->mstb->link_address_sent = true; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | if (created && !port->input) { | |
1096 | char proppath[255]; | |
1097 | build_mst_prop_path(port, mstb, proppath); | |
1098 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); | |
1099 | } | |
1100 | ||
1101 | /* put reference to this port */ | |
1102 | drm_dp_put_port(port); | |
1103 | } | |
1104 | ||
1105 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, | |
1106 | struct drm_dp_connection_status_notify *conn_stat) | |
1107 | { | |
1108 | struct drm_dp_mst_port *port; | |
1109 | int old_pdt; | |
1110 | int old_ddps; | |
1111 | bool dowork = false; | |
1112 | port = drm_dp_get_port(mstb, conn_stat->port_number); | |
1113 | if (!port) | |
1114 | return; | |
1115 | ||
1116 | old_ddps = port->ddps; | |
1117 | old_pdt = port->pdt; | |
1118 | port->pdt = conn_stat->peer_device_type; | |
1119 | port->mcs = conn_stat->message_capability_status; | |
1120 | port->ldps = conn_stat->legacy_device_plug_status; | |
1121 | port->ddps = conn_stat->displayport_device_plug_status; | |
1122 | ||
1123 | if (old_ddps != port->ddps) { | |
1124 | if (port->ddps) { | |
1125 | drm_dp_check_port_guid(mstb, port); | |
1126 | dowork = true; | |
1127 | } else { | |
1128 | port->guid_valid = false; | |
1129 | port->available_pbn = 0; | |
1130 | } | |
1131 | } | |
1132 | if (old_pdt != port->pdt && !port->input) { | |
1133 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1134 | ||
1135 | if (drm_dp_port_setup_pdt(port)) | |
1136 | dowork = true; | |
1137 | } | |
1138 | ||
1139 | drm_dp_put_port(port); | |
1140 | if (dowork) | |
1141 | queue_work(system_long_wq, &mstb->mgr->work); | |
1142 | ||
1143 | } | |
1144 | ||
1145 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, | |
1146 | u8 lct, u8 *rad) | |
1147 | { | |
1148 | struct drm_dp_mst_branch *mstb; | |
1149 | struct drm_dp_mst_port *port; | |
1150 | int i; | |
1151 | /* find the port by iterating down */ | |
1152 | mstb = mgr->mst_primary; | |
1153 | ||
1154 | for (i = 0; i < lct - 1; i++) { | |
1155 | int shift = (i % 2) ? 0 : 4; | |
1156 | int port_num = rad[i / 2] >> shift; | |
1157 | ||
1158 | list_for_each_entry(port, &mstb->ports, next) { | |
1159 | if (port->port_num == port_num) { | |
1160 | if (!port->mstb) { | |
1161 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); | |
1162 | return NULL; | |
1163 | } | |
1164 | ||
1165 | mstb = port->mstb; | |
1166 | break; | |
1167 | } | |
1168 | } | |
1169 | } | |
1170 | kref_get(&mstb->kref); | |
1171 | return mstb; | |
1172 | } | |
1173 | ||
1174 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, | |
1175 | struct drm_dp_mst_branch *mstb) | |
1176 | { | |
1177 | struct drm_dp_mst_port *port; | |
1178 | ||
1179 | if (!mstb->link_address_sent) { | |
1180 | drm_dp_send_link_address(mgr, mstb); | |
1181 | mstb->link_address_sent = true; | |
1182 | } | |
1183 | list_for_each_entry(port, &mstb->ports, next) { | |
1184 | if (port->input) | |
1185 | continue; | |
1186 | ||
1187 | if (!port->ddps) | |
1188 | continue; | |
1189 | ||
1190 | if (!port->available_pbn) | |
1191 | drm_dp_send_enum_path_resources(mgr, mstb, port); | |
1192 | ||
1193 | if (port->mstb) | |
1194 | drm_dp_check_and_send_link_address(mgr, port->mstb); | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | static void drm_dp_mst_link_probe_work(struct work_struct *work) | |
1199 | { | |
1200 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); | |
1201 | ||
1202 | drm_dp_check_and_send_link_address(mgr, mgr->mst_primary); | |
1203 | ||
1204 | } | |
1205 | ||
1206 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
1207 | u8 *guid) | |
1208 | { | |
1209 | static u8 zero_guid[16]; | |
1210 | ||
1211 | if (!memcmp(guid, zero_guid, 16)) { | |
1212 | u64 salt = get_jiffies_64(); | |
1213 | memcpy(&guid[0], &salt, sizeof(u64)); | |
1214 | memcpy(&guid[8], &salt, sizeof(u64)); | |
1215 | return false; | |
1216 | } | |
1217 | return true; | |
1218 | } | |
1219 | ||
1220 | #if 0 | |
1221 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) | |
1222 | { | |
1223 | struct drm_dp_sideband_msg_req_body req; | |
1224 | ||
1225 | req.req_type = DP_REMOTE_DPCD_READ; | |
1226 | req.u.dpcd_read.port_number = port_num; | |
1227 | req.u.dpcd_read.dpcd_address = offset; | |
1228 | req.u.dpcd_read.num_bytes = num_bytes; | |
1229 | drm_dp_encode_sideband_req(&req, msg); | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | #endif | |
1234 | ||
1235 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, | |
1236 | bool up, u8 *msg, int len) | |
1237 | { | |
1238 | int ret; | |
1239 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; | |
1240 | int tosend, total, offset; | |
1241 | int retries = 0; | |
1242 | ||
1243 | retry: | |
1244 | total = len; | |
1245 | offset = 0; | |
1246 | do { | |
1247 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); | |
1248 | ||
1249 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, | |
1250 | &msg[offset], | |
1251 | tosend); | |
1252 | if (ret != tosend) { | |
1253 | if (ret == -EIO && retries < 5) { | |
1254 | retries++; | |
1255 | goto retry; | |
1256 | } | |
1257 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); | |
1258 | WARN(1, "fail\n"); | |
1259 | ||
1260 | return -EIO; | |
1261 | } | |
1262 | offset += tosend; | |
1263 | total -= tosend; | |
1264 | } while (total > 0); | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, | |
1269 | struct drm_dp_sideband_msg_tx *txmsg) | |
1270 | { | |
1271 | struct drm_dp_mst_branch *mstb = txmsg->dst; | |
1272 | ||
1273 | /* both msg slots are full */ | |
1274 | if (txmsg->seqno == -1) { | |
1275 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { | |
1276 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); | |
1277 | return -EAGAIN; | |
1278 | } | |
1279 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { | |
1280 | txmsg->seqno = mstb->last_seqno; | |
1281 | mstb->last_seqno ^= 1; | |
1282 | } else if (mstb->tx_slots[0] == NULL) | |
1283 | txmsg->seqno = 0; | |
1284 | else | |
1285 | txmsg->seqno = 1; | |
1286 | mstb->tx_slots[txmsg->seqno] = txmsg; | |
1287 | } | |
1288 | hdr->broadcast = 0; | |
1289 | hdr->path_msg = txmsg->path_msg; | |
1290 | hdr->lct = mstb->lct; | |
1291 | hdr->lcr = mstb->lct - 1; | |
1292 | if (mstb->lct > 1) | |
1293 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); | |
1294 | hdr->seqno = txmsg->seqno; | |
1295 | return 0; | |
1296 | } | |
1297 | /* | |
1298 | * process a single block of the next message in the sideband queue | |
1299 | */ | |
1300 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, | |
1301 | struct drm_dp_sideband_msg_tx *txmsg, | |
1302 | bool up) | |
1303 | { | |
1304 | u8 chunk[48]; | |
1305 | struct drm_dp_sideband_msg_hdr hdr; | |
1306 | int len, space, idx, tosend; | |
1307 | int ret; | |
1308 | ||
bf3719c0 DL |
1309 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
1310 | ||
ad7f8a1f DA |
1311 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
1312 | txmsg->seqno = -1; | |
1313 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; | |
1314 | } | |
1315 | ||
1316 | /* make hdr from dst mst - for replies use seqno | |
1317 | otherwise assign one */ | |
1318 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); | |
1319 | if (ret < 0) | |
1320 | return ret; | |
1321 | ||
1322 | /* amount left to send in this message */ | |
1323 | len = txmsg->cur_len - txmsg->cur_offset; | |
1324 | ||
1325 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ | |
1326 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); | |
1327 | ||
1328 | tosend = min(len, space); | |
1329 | if (len == txmsg->cur_len) | |
1330 | hdr.somt = 1; | |
1331 | if (space >= len) | |
1332 | hdr.eomt = 1; | |
1333 | ||
1334 | ||
1335 | hdr.msg_len = tosend + 1; | |
1336 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); | |
1337 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); | |
1338 | /* add crc at end */ | |
1339 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); | |
1340 | idx += tosend + 1; | |
1341 | ||
1342 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); | |
1343 | if (ret) { | |
1344 | DRM_DEBUG_KMS("sideband msg failed to send\n"); | |
1345 | return ret; | |
1346 | } | |
1347 | ||
1348 | txmsg->cur_offset += tosend; | |
1349 | if (txmsg->cur_offset == txmsg->cur_len) { | |
1350 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; | |
1351 | return 1; | |
1352 | } | |
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | /* must be called holding qlock */ | |
1357 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) | |
1358 | { | |
1359 | struct drm_dp_sideband_msg_tx *txmsg; | |
1360 | int ret; | |
1361 | ||
1362 | /* construct a chunk from the first msg in the tx_msg queue */ | |
1363 | if (list_empty(&mgr->tx_msg_downq)) { | |
1364 | mgr->tx_down_in_progress = false; | |
1365 | return; | |
1366 | } | |
1367 | mgr->tx_down_in_progress = true; | |
1368 | ||
1369 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); | |
1370 | ret = process_single_tx_qlock(mgr, txmsg, false); | |
1371 | if (ret == 1) { | |
1372 | /* txmsg is sent it should be in the slots now */ | |
1373 | list_del(&txmsg->next); | |
1374 | } else if (ret) { | |
1375 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); | |
1376 | list_del(&txmsg->next); | |
1377 | if (txmsg->seqno != -1) | |
1378 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
1379 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
1380 | wake_up(&mgr->tx_waitq); | |
1381 | } | |
1382 | if (list_empty(&mgr->tx_msg_downq)) { | |
1383 | mgr->tx_down_in_progress = false; | |
1384 | return; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | /* called holding qlock */ | |
1389 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) | |
1390 | { | |
1391 | struct drm_dp_sideband_msg_tx *txmsg; | |
1392 | int ret; | |
1393 | ||
1394 | /* construct a chunk from the first msg in the tx_msg queue */ | |
1395 | if (list_empty(&mgr->tx_msg_upq)) { | |
1396 | mgr->tx_up_in_progress = false; | |
1397 | return; | |
1398 | } | |
1399 | ||
1400 | txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next); | |
1401 | ret = process_single_tx_qlock(mgr, txmsg, true); | |
1402 | if (ret == 1) { | |
1403 | /* up txmsgs aren't put in slots - so free after we send it */ | |
1404 | list_del(&txmsg->next); | |
1405 | kfree(txmsg); | |
1406 | } else if (ret) | |
1407 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); | |
1408 | mgr->tx_up_in_progress = true; | |
1409 | } | |
1410 | ||
1411 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, | |
1412 | struct drm_dp_sideband_msg_tx *txmsg) | |
1413 | { | |
1414 | mutex_lock(&mgr->qlock); | |
1415 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); | |
1416 | if (!mgr->tx_down_in_progress) | |
1417 | process_single_down_tx_qlock(mgr); | |
1418 | mutex_unlock(&mgr->qlock); | |
1419 | } | |
1420 | ||
1421 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, | |
1422 | struct drm_dp_mst_branch *mstb) | |
1423 | { | |
1424 | int len; | |
1425 | struct drm_dp_sideband_msg_tx *txmsg; | |
1426 | int ret; | |
1427 | ||
1428 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1429 | if (!txmsg) | |
1430 | return -ENOMEM; | |
1431 | ||
1432 | txmsg->dst = mstb; | |
1433 | len = build_link_address(txmsg); | |
1434 | ||
1435 | drm_dp_queue_down_tx(mgr, txmsg); | |
1436 | ||
1437 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1438 | if (ret > 0) { | |
1439 | int i; | |
1440 | ||
1441 | if (txmsg->reply.reply_type == 1) | |
1442 | DRM_DEBUG_KMS("link address nak received\n"); | |
1443 | else { | |
1444 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); | |
1445 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { | |
1446 | 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, | |
1447 | txmsg->reply.u.link_addr.ports[i].input_port, | |
1448 | txmsg->reply.u.link_addr.ports[i].peer_device_type, | |
1449 | txmsg->reply.u.link_addr.ports[i].port_number, | |
1450 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, | |
1451 | txmsg->reply.u.link_addr.ports[i].mcs, | |
1452 | txmsg->reply.u.link_addr.ports[i].ddps, | |
1453 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, | |
1454 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, | |
1455 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); | |
1456 | } | |
1457 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { | |
1458 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); | |
1459 | } | |
1460 | (*mgr->cbs->hotplug)(mgr); | |
1461 | } | |
1462 | } else | |
1463 | DRM_DEBUG_KMS("link address failed %d\n", ret); | |
1464 | ||
1465 | kfree(txmsg); | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, | |
1470 | struct drm_dp_mst_branch *mstb, | |
1471 | struct drm_dp_mst_port *port) | |
1472 | { | |
1473 | int len; | |
1474 | struct drm_dp_sideband_msg_tx *txmsg; | |
1475 | int ret; | |
1476 | ||
1477 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1478 | if (!txmsg) | |
1479 | return -ENOMEM; | |
1480 | ||
1481 | txmsg->dst = mstb; | |
1482 | len = build_enum_path_resources(txmsg, port->port_num); | |
1483 | ||
1484 | drm_dp_queue_down_tx(mgr, txmsg); | |
1485 | ||
1486 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1487 | if (ret > 0) { | |
1488 | if (txmsg->reply.reply_type == 1) | |
1489 | DRM_DEBUG_KMS("enum path resources nak received\n"); | |
1490 | else { | |
1491 | if (port->port_num != txmsg->reply.u.path_resources.port_number) | |
1492 | DRM_ERROR("got incorrect port in response\n"); | |
1493 | 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, | |
1494 | txmsg->reply.u.path_resources.avail_payload_bw_number); | |
1495 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | kfree(txmsg); | |
1500 | return 0; | |
1501 | } | |
1502 | ||
8fa6a425 TR |
1503 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
1504 | struct drm_dp_mst_port *port, | |
1505 | int id, | |
1506 | int pbn) | |
ad7f8a1f DA |
1507 | { |
1508 | struct drm_dp_sideband_msg_tx *txmsg; | |
1509 | struct drm_dp_mst_branch *mstb; | |
1510 | int len, ret; | |
1511 | ||
1512 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
1513 | if (!mstb) | |
1514 | return -EINVAL; | |
1515 | ||
1516 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1517 | if (!txmsg) { | |
1518 | ret = -ENOMEM; | |
1519 | goto fail_put; | |
1520 | } | |
1521 | ||
1522 | txmsg->dst = mstb; | |
1523 | len = build_allocate_payload(txmsg, port->port_num, | |
1524 | id, | |
1525 | pbn); | |
1526 | ||
1527 | drm_dp_queue_down_tx(mgr, txmsg); | |
1528 | ||
1529 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1530 | if (ret > 0) { | |
1531 | if (txmsg->reply.reply_type == 1) { | |
1532 | ret = -EINVAL; | |
1533 | } else | |
1534 | ret = 0; | |
1535 | } | |
1536 | kfree(txmsg); | |
1537 | fail_put: | |
1538 | drm_dp_put_mst_branch_device(mstb); | |
1539 | return ret; | |
1540 | } | |
1541 | ||
1542 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, | |
1543 | int id, | |
1544 | struct drm_dp_payload *payload) | |
1545 | { | |
1546 | int ret; | |
1547 | ||
1548 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); | |
1549 | if (ret < 0) { | |
1550 | payload->payload_state = 0; | |
1551 | return ret; | |
1552 | } | |
1553 | payload->payload_state = DP_PAYLOAD_LOCAL; | |
1554 | return 0; | |
1555 | } | |
1556 | ||
8fa6a425 TR |
1557 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
1558 | struct drm_dp_mst_port *port, | |
1559 | int id, | |
1560 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1561 | { |
1562 | int ret; | |
1563 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); | |
1564 | if (ret < 0) | |
1565 | return ret; | |
1566 | payload->payload_state = DP_PAYLOAD_REMOTE; | |
1567 | return ret; | |
1568 | } | |
1569 | ||
8fa6a425 TR |
1570 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
1571 | struct drm_dp_mst_port *port, | |
1572 | int id, | |
1573 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1574 | { |
1575 | DRM_DEBUG_KMS("\n"); | |
1576 | /* its okay for these to fail */ | |
1577 | if (port) { | |
1578 | drm_dp_payload_send_msg(mgr, port, id, 0); | |
1579 | } | |
1580 | ||
1581 | drm_dp_dpcd_write_payload(mgr, id, payload); | |
dfda0df3 | 1582 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
ad7f8a1f DA |
1583 | return 0; |
1584 | } | |
1585 | ||
8fa6a425 TR |
1586 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
1587 | int id, | |
1588 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1589 | { |
1590 | payload->payload_state = 0; | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | /** | |
1595 | * drm_dp_update_payload_part1() - Execute payload update part 1 | |
1596 | * @mgr: manager to use. | |
1597 | * | |
1598 | * This iterates over all proposed virtual channels, and tries to | |
1599 | * allocate space in the link for them. For 0->slots transitions, | |
1600 | * this step just writes the VCPI to the MST device. For slots->0 | |
1601 | * transitions, this writes the updated VCPIs and removes the | |
1602 | * remote VC payloads. | |
1603 | * | |
1604 | * after calling this the driver should generate ACT and payload | |
1605 | * packets. | |
1606 | */ | |
1607 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) | |
1608 | { | |
dfda0df3 | 1609 | int i, j; |
ad7f8a1f DA |
1610 | int cur_slots = 1; |
1611 | struct drm_dp_payload req_payload; | |
1612 | struct drm_dp_mst_port *port; | |
1613 | ||
1614 | mutex_lock(&mgr->payload_lock); | |
1615 | for (i = 0; i < mgr->max_payloads; i++) { | |
1616 | /* solve the current payloads - compare to the hw ones | |
1617 | - update the hw view */ | |
1618 | req_payload.start_slot = cur_slots; | |
1619 | if (mgr->proposed_vcpis[i]) { | |
1620 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
1621 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; | |
1622 | } else { | |
1623 | port = NULL; | |
1624 | req_payload.num_slots = 0; | |
1625 | } | |
dfda0df3 DA |
1626 | |
1627 | if (mgr->payloads[i].start_slot != req_payload.start_slot) { | |
1628 | mgr->payloads[i].start_slot = req_payload.start_slot; | |
1629 | } | |
ad7f8a1f | 1630 | /* work out what is required to happen with this payload */ |
dfda0df3 | 1631 | if (mgr->payloads[i].num_slots != req_payload.num_slots) { |
ad7f8a1f DA |
1632 | |
1633 | /* need to push an update for this payload */ | |
1634 | if (req_payload.num_slots) { | |
dfda0df3 | 1635 | drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); |
ad7f8a1f DA |
1636 | mgr->payloads[i].num_slots = req_payload.num_slots; |
1637 | } else if (mgr->payloads[i].num_slots) { | |
1638 | mgr->payloads[i].num_slots = 0; | |
dfda0df3 | 1639 | drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]); |
ad7f8a1f | 1640 | req_payload.payload_state = mgr->payloads[i].payload_state; |
dfda0df3 DA |
1641 | mgr->payloads[i].start_slot = 0; |
1642 | } | |
ad7f8a1f DA |
1643 | mgr->payloads[i].payload_state = req_payload.payload_state; |
1644 | } | |
1645 | cur_slots += req_payload.num_slots; | |
1646 | } | |
dfda0df3 DA |
1647 | |
1648 | for (i = 0; i < mgr->max_payloads; i++) { | |
1649 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { | |
1650 | DRM_DEBUG_KMS("removing payload %d\n", i); | |
1651 | for (j = i; j < mgr->max_payloads - 1; j++) { | |
1652 | memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); | |
1653 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; | |
1654 | if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { | |
1655 | set_bit(j + 1, &mgr->payload_mask); | |
1656 | } else { | |
1657 | clear_bit(j + 1, &mgr->payload_mask); | |
1658 | } | |
1659 | } | |
1660 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); | |
1661 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; | |
1662 | clear_bit(mgr->max_payloads, &mgr->payload_mask); | |
1663 | ||
1664 | } | |
1665 | } | |
ad7f8a1f DA |
1666 | mutex_unlock(&mgr->payload_lock); |
1667 | ||
1668 | return 0; | |
1669 | } | |
1670 | EXPORT_SYMBOL(drm_dp_update_payload_part1); | |
1671 | ||
1672 | /** | |
1673 | * drm_dp_update_payload_part2() - Execute payload update part 2 | |
1674 | * @mgr: manager to use. | |
1675 | * | |
1676 | * This iterates over all proposed virtual channels, and tries to | |
1677 | * allocate space in the link for them. For 0->slots transitions, | |
1678 | * this step writes the remote VC payload commands. For slots->0 | |
1679 | * this just resets some internal state. | |
1680 | */ | |
1681 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) | |
1682 | { | |
1683 | struct drm_dp_mst_port *port; | |
1684 | int i; | |
7389ad4b | 1685 | int ret = 0; |
ad7f8a1f DA |
1686 | mutex_lock(&mgr->payload_lock); |
1687 | for (i = 0; i < mgr->max_payloads; i++) { | |
1688 | ||
1689 | if (!mgr->proposed_vcpis[i]) | |
1690 | continue; | |
1691 | ||
1692 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
1693 | ||
1694 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); | |
1695 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { | |
dfda0df3 | 1696 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f | 1697 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
dfda0df3 | 1698 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f DA |
1699 | } |
1700 | if (ret) { | |
1701 | mutex_unlock(&mgr->payload_lock); | |
1702 | return ret; | |
1703 | } | |
1704 | } | |
1705 | mutex_unlock(&mgr->payload_lock); | |
1706 | return 0; | |
1707 | } | |
1708 | EXPORT_SYMBOL(drm_dp_update_payload_part2); | |
1709 | ||
1710 | #if 0 /* unused as of yet */ | |
1711 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, | |
1712 | struct drm_dp_mst_port *port, | |
1713 | int offset, int size) | |
1714 | { | |
1715 | int len; | |
1716 | struct drm_dp_sideband_msg_tx *txmsg; | |
1717 | ||
1718 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1719 | if (!txmsg) | |
1720 | return -ENOMEM; | |
1721 | ||
1722 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); | |
1723 | txmsg->dst = port->parent; | |
1724 | ||
1725 | drm_dp_queue_down_tx(mgr, txmsg); | |
1726 | ||
1727 | return 0; | |
1728 | } | |
1729 | #endif | |
1730 | ||
1731 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
1732 | struct drm_dp_mst_port *port, | |
1733 | int offset, int size, u8 *bytes) | |
1734 | { | |
1735 | int len; | |
1736 | int ret; | |
1737 | struct drm_dp_sideband_msg_tx *txmsg; | |
1738 | struct drm_dp_mst_branch *mstb; | |
1739 | ||
1740 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
1741 | if (!mstb) | |
1742 | return -EINVAL; | |
1743 | ||
1744 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1745 | if (!txmsg) { | |
1746 | ret = -ENOMEM; | |
1747 | goto fail_put; | |
1748 | } | |
1749 | ||
1750 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); | |
1751 | txmsg->dst = mstb; | |
1752 | ||
1753 | drm_dp_queue_down_tx(mgr, txmsg); | |
1754 | ||
1755 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1756 | if (ret > 0) { | |
1757 | if (txmsg->reply.reply_type == 1) { | |
1758 | ret = -EINVAL; | |
1759 | } else | |
1760 | ret = 0; | |
1761 | } | |
1762 | kfree(txmsg); | |
1763 | fail_put: | |
1764 | drm_dp_put_mst_branch_device(mstb); | |
1765 | return ret; | |
1766 | } | |
1767 | ||
1768 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) | |
1769 | { | |
1770 | struct drm_dp_sideband_msg_reply_body reply; | |
1771 | ||
1772 | reply.reply_type = 1; | |
1773 | reply.req_type = req_type; | |
1774 | drm_dp_encode_sideband_reply(&reply, msg); | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, | |
1779 | struct drm_dp_mst_branch *mstb, | |
1780 | int req_type, int seqno, bool broadcast) | |
1781 | { | |
1782 | struct drm_dp_sideband_msg_tx *txmsg; | |
1783 | ||
1784 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1785 | if (!txmsg) | |
1786 | return -ENOMEM; | |
1787 | ||
1788 | txmsg->dst = mstb; | |
1789 | txmsg->seqno = seqno; | |
1790 | drm_dp_encode_up_ack_reply(txmsg, req_type); | |
1791 | ||
1792 | mutex_lock(&mgr->qlock); | |
1793 | list_add_tail(&txmsg->next, &mgr->tx_msg_upq); | |
1794 | if (!mgr->tx_up_in_progress) { | |
1795 | process_single_up_tx_qlock(mgr); | |
1796 | } | |
1797 | mutex_unlock(&mgr->qlock); | |
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | static int drm_dp_get_vc_payload_bw(int dp_link_bw, int dp_link_count) | |
1802 | { | |
1803 | switch (dp_link_bw) { | |
1804 | case DP_LINK_BW_1_62: | |
1805 | return 3 * dp_link_count; | |
1806 | case DP_LINK_BW_2_7: | |
1807 | return 5 * dp_link_count; | |
1808 | case DP_LINK_BW_5_4: | |
1809 | return 10 * dp_link_count; | |
1810 | } | |
c11cda52 | 1811 | BUG(); |
ad7f8a1f DA |
1812 | } |
1813 | ||
1814 | /** | |
1815 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager | |
1816 | * @mgr: manager to set state for | |
1817 | * @mst_state: true to enable MST on this connector - false to disable. | |
1818 | * | |
1819 | * This is called by the driver when it detects an MST capable device plugged | |
1820 | * into a DP MST capable port, or when a DP MST capable device is unplugged. | |
1821 | */ | |
1822 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) | |
1823 | { | |
1824 | int ret = 0; | |
1825 | struct drm_dp_mst_branch *mstb = NULL; | |
1826 | ||
1827 | mutex_lock(&mgr->lock); | |
1828 | if (mst_state == mgr->mst_state) | |
1829 | goto out_unlock; | |
1830 | ||
1831 | mgr->mst_state = mst_state; | |
1832 | /* set the device into MST mode */ | |
1833 | if (mst_state) { | |
1834 | WARN_ON(mgr->mst_primary); | |
1835 | ||
1836 | /* get dpcd info */ | |
1837 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); | |
1838 | if (ret != DP_RECEIVER_CAP_SIZE) { | |
1839 | DRM_DEBUG_KMS("failed to read DPCD\n"); | |
1840 | goto out_unlock; | |
1841 | } | |
1842 | ||
1843 | mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK); | |
1844 | mgr->total_pbn = 2560; | |
1845 | mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); | |
1846 | mgr->avail_slots = mgr->total_slots; | |
1847 | ||
1848 | /* add initial branch device at LCT 1 */ | |
1849 | mstb = drm_dp_add_mst_branch_device(1, NULL); | |
1850 | if (mstb == NULL) { | |
1851 | ret = -ENOMEM; | |
1852 | goto out_unlock; | |
1853 | } | |
1854 | mstb->mgr = mgr; | |
1855 | ||
1856 | /* give this the main reference */ | |
1857 | mgr->mst_primary = mstb; | |
1858 | kref_get(&mgr->mst_primary->kref); | |
1859 | ||
1860 | { | |
1861 | struct drm_dp_payload reset_pay; | |
1862 | reset_pay.start_slot = 0; | |
1863 | reset_pay.num_slots = 0x3f; | |
1864 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); | |
1865 | } | |
1866 | ||
1867 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
1868 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
1869 | if (ret < 0) { | |
1870 | goto out_unlock; | |
1871 | } | |
1872 | ||
1873 | ||
1874 | /* sort out guid */ | |
1875 | ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16); | |
1876 | if (ret != 16) { | |
1877 | DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret); | |
1878 | goto out_unlock; | |
1879 | } | |
1880 | ||
1881 | mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid); | |
1882 | if (!mgr->guid_valid) { | |
1883 | ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16); | |
1884 | mgr->guid_valid = true; | |
1885 | } | |
1886 | ||
1887 | queue_work(system_long_wq, &mgr->work); | |
1888 | ||
1889 | ret = 0; | |
1890 | } else { | |
1891 | /* disable MST on the device */ | |
1892 | mstb = mgr->mst_primary; | |
1893 | mgr->mst_primary = NULL; | |
1894 | /* this can fail if the device is gone */ | |
1895 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); | |
1896 | ret = 0; | |
1897 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); | |
1898 | mgr->payload_mask = 0; | |
1899 | set_bit(0, &mgr->payload_mask); | |
dfda0df3 | 1900 | mgr->vcpi_mask = 0; |
ad7f8a1f DA |
1901 | } |
1902 | ||
1903 | out_unlock: | |
1904 | mutex_unlock(&mgr->lock); | |
1905 | if (mstb) | |
1906 | drm_dp_put_mst_branch_device(mstb); | |
1907 | return ret; | |
1908 | ||
1909 | } | |
1910 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); | |
1911 | ||
1912 | /** | |
1913 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager | |
1914 | * @mgr: manager to suspend | |
1915 | * | |
1916 | * This function tells the MST device that we can't handle UP messages | |
1917 | * anymore. This should stop it from sending any since we are suspended. | |
1918 | */ | |
1919 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) | |
1920 | { | |
1921 | mutex_lock(&mgr->lock); | |
1922 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
1923 | DP_MST_EN | DP_UPSTREAM_IS_SRC); | |
1924 | mutex_unlock(&mgr->lock); | |
1925 | } | |
1926 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); | |
1927 | ||
1928 | /** | |
1929 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager | |
1930 | * @mgr: manager to resume | |
1931 | * | |
1932 | * This will fetch DPCD and see if the device is still there, | |
1933 | * if it is, it will rewrite the MSTM control bits, and return. | |
1934 | * | |
1935 | * if the device fails this returns -1, and the driver should do | |
1936 | * a full MST reprobe, in case we were undocked. | |
1937 | */ | |
1938 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) | |
1939 | { | |
1940 | int ret = 0; | |
1941 | ||
1942 | mutex_lock(&mgr->lock); | |
1943 | ||
1944 | if (mgr->mst_primary) { | |
1945 | int sret; | |
1946 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); | |
1947 | if (sret != DP_RECEIVER_CAP_SIZE) { | |
1948 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
1949 | ret = -1; | |
1950 | goto out_unlock; | |
1951 | } | |
1952 | ||
1953 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
1954 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
1955 | if (ret < 0) { | |
1956 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); | |
1957 | ret = -1; | |
1958 | goto out_unlock; | |
1959 | } | |
1960 | ret = 0; | |
1961 | } else | |
1962 | ret = -1; | |
1963 | ||
1964 | out_unlock: | |
1965 | mutex_unlock(&mgr->lock); | |
1966 | return ret; | |
1967 | } | |
1968 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); | |
1969 | ||
1970 | static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) | |
1971 | { | |
1972 | int len; | |
1973 | u8 replyblock[32]; | |
1974 | int replylen, origlen, curreply; | |
1975 | int ret; | |
1976 | struct drm_dp_sideband_msg_rx *msg; | |
1977 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; | |
1978 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; | |
1979 | ||
1980 | len = min(mgr->max_dpcd_transaction_bytes, 16); | |
1981 | ret = drm_dp_dpcd_read(mgr->aux, basereg, | |
1982 | replyblock, len); | |
1983 | if (ret != len) { | |
1984 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); | |
1985 | return; | |
1986 | } | |
1987 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); | |
1988 | if (!ret) { | |
1989 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); | |
1990 | return; | |
1991 | } | |
1992 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; | |
1993 | ||
1994 | origlen = replylen; | |
1995 | replylen -= len; | |
1996 | curreply = len; | |
1997 | while (replylen > 0) { | |
1998 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); | |
1999 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, | |
2000 | replyblock, len); | |
2001 | if (ret != len) { | |
2002 | DRM_DEBUG_KMS("failed to read a chunk\n"); | |
2003 | } | |
2004 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); | |
2005 | if (ret == false) | |
2006 | DRM_DEBUG_KMS("failed to build sideband msg\n"); | |
2007 | curreply += len; | |
2008 | replylen -= len; | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) | |
2013 | { | |
2014 | int ret = 0; | |
2015 | ||
2016 | drm_dp_get_one_sb_msg(mgr, false); | |
2017 | ||
2018 | if (mgr->down_rep_recv.have_eomt) { | |
2019 | struct drm_dp_sideband_msg_tx *txmsg; | |
2020 | struct drm_dp_mst_branch *mstb; | |
2021 | int slot = -1; | |
2022 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2023 | mgr->down_rep_recv.initial_hdr.lct, | |
2024 | mgr->down_rep_recv.initial_hdr.rad); | |
2025 | ||
2026 | if (!mstb) { | |
2027 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); | |
2028 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | /* find the message */ | |
2033 | slot = mgr->down_rep_recv.initial_hdr.seqno; | |
2034 | mutex_lock(&mgr->qlock); | |
2035 | txmsg = mstb->tx_slots[slot]; | |
2036 | /* remove from slots */ | |
2037 | mutex_unlock(&mgr->qlock); | |
2038 | ||
2039 | if (!txmsg) { | |
2040 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", | |
2041 | mstb, | |
2042 | mgr->down_rep_recv.initial_hdr.seqno, | |
2043 | mgr->down_rep_recv.initial_hdr.lct, | |
2044 | mgr->down_rep_recv.initial_hdr.rad[0], | |
2045 | mgr->down_rep_recv.msg[0]); | |
2046 | drm_dp_put_mst_branch_device(mstb); | |
2047 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2048 | return 0; | |
2049 | } | |
2050 | ||
2051 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); | |
2052 | if (txmsg->reply.reply_type == 1) { | |
2053 | 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); | |
2054 | } | |
2055 | ||
2056 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2057 | drm_dp_put_mst_branch_device(mstb); | |
2058 | ||
2059 | mutex_lock(&mgr->qlock); | |
2060 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; | |
2061 | mstb->tx_slots[slot] = NULL; | |
2062 | mutex_unlock(&mgr->qlock); | |
2063 | ||
2064 | wake_up(&mgr->tx_waitq); | |
2065 | } | |
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) | |
2070 | { | |
2071 | int ret = 0; | |
2072 | drm_dp_get_one_sb_msg(mgr, true); | |
2073 | ||
2074 | if (mgr->up_req_recv.have_eomt) { | |
2075 | struct drm_dp_sideband_msg_req_body msg; | |
2076 | struct drm_dp_mst_branch *mstb; | |
2077 | bool seqno; | |
2078 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2079 | mgr->up_req_recv.initial_hdr.lct, | |
2080 | mgr->up_req_recv.initial_hdr.rad); | |
2081 | if (!mstb) { | |
2082 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2083 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | seqno = mgr->up_req_recv.initial_hdr.seqno; | |
2088 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); | |
2089 | ||
2090 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { | |
2091 | drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); | |
2092 | drm_dp_update_port(mstb, &msg.u.conn_stat); | |
2093 | 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); | |
2094 | (*mgr->cbs->hotplug)(mgr); | |
2095 | ||
2096 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { | |
2097 | drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); | |
2098 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); | |
2099 | } | |
2100 | ||
2101 | drm_dp_put_mst_branch_device(mstb); | |
2102 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2103 | } | |
2104 | return ret; | |
2105 | } | |
2106 | ||
2107 | /** | |
2108 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify | |
2109 | * @mgr: manager to notify irq for. | |
2110 | * @esi: 4 bytes from SINK_COUNT_ESI | |
295ee853 | 2111 | * @handled: whether the hpd interrupt was consumed or not |
ad7f8a1f DA |
2112 | * |
2113 | * This should be called from the driver when it detects a short IRQ, | |
2114 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The | |
2115 | * topology manager will process the sideband messages received as a result | |
2116 | * of this. | |
2117 | */ | |
2118 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) | |
2119 | { | |
2120 | int ret = 0; | |
2121 | int sc; | |
2122 | *handled = false; | |
2123 | sc = esi[0] & 0x3f; | |
2124 | ||
2125 | if (sc != mgr->sink_count) { | |
2126 | mgr->sink_count = sc; | |
2127 | *handled = true; | |
2128 | } | |
2129 | ||
2130 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { | |
2131 | ret = drm_dp_mst_handle_down_rep(mgr); | |
2132 | *handled = true; | |
2133 | } | |
2134 | ||
2135 | if (esi[1] & DP_UP_REQ_MSG_RDY) { | |
2136 | ret |= drm_dp_mst_handle_up_req(mgr); | |
2137 | *handled = true; | |
2138 | } | |
2139 | ||
2140 | drm_dp_mst_kick_tx(mgr); | |
2141 | return ret; | |
2142 | } | |
2143 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); | |
2144 | ||
2145 | /** | |
2146 | * drm_dp_mst_detect_port() - get connection status for an MST port | |
2147 | * @mgr: manager for this port | |
2148 | * @port: unverified pointer to a port | |
2149 | * | |
2150 | * This returns the current connection state for a port. It validates the | |
2151 | * port pointer still exists so the caller doesn't require a reference | |
2152 | */ | |
2153 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2154 | { | |
2155 | enum drm_connector_status status = connector_status_disconnected; | |
2156 | ||
2157 | /* we need to search for the port in the mgr in case its gone */ | |
2158 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2159 | if (!port) | |
2160 | return connector_status_disconnected; | |
2161 | ||
2162 | if (!port->ddps) | |
2163 | goto out; | |
2164 | ||
2165 | switch (port->pdt) { | |
2166 | case DP_PEER_DEVICE_NONE: | |
2167 | case DP_PEER_DEVICE_MST_BRANCHING: | |
2168 | break; | |
2169 | ||
2170 | case DP_PEER_DEVICE_SST_SINK: | |
2171 | status = connector_status_connected; | |
2172 | break; | |
2173 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
2174 | if (port->ldps) | |
2175 | status = connector_status_connected; | |
2176 | break; | |
2177 | } | |
2178 | out: | |
2179 | drm_dp_put_port(port); | |
2180 | return status; | |
2181 | } | |
2182 | EXPORT_SYMBOL(drm_dp_mst_detect_port); | |
2183 | ||
2184 | /** | |
2185 | * drm_dp_mst_get_edid() - get EDID for an MST port | |
2186 | * @connector: toplevel connector to get EDID for | |
2187 | * @mgr: manager for this port | |
2188 | * @port: unverified pointer to a port. | |
2189 | * | |
2190 | * This returns an EDID for the port connected to a connector, | |
2191 | * It validates the pointer still exists so the caller doesn't require a | |
2192 | * reference. | |
2193 | */ | |
2194 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2195 | { | |
2196 | struct edid *edid = NULL; | |
2197 | ||
2198 | /* we need to search for the port in the mgr in case its gone */ | |
2199 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2200 | if (!port) | |
2201 | return NULL; | |
2202 | ||
2203 | edid = drm_get_edid(connector, &port->aux.ddc); | |
2204 | drm_dp_put_port(port); | |
2205 | return edid; | |
2206 | } | |
2207 | EXPORT_SYMBOL(drm_dp_mst_get_edid); | |
2208 | ||
2209 | /** | |
2210 | * drm_dp_find_vcpi_slots() - find slots for this PBN value | |
2211 | * @mgr: manager to use | |
2212 | * @pbn: payload bandwidth to convert into slots. | |
2213 | */ | |
2214 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, | |
2215 | int pbn) | |
2216 | { | |
2217 | int num_slots; | |
2218 | ||
2219 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2220 | ||
2221 | if (num_slots > mgr->avail_slots) | |
2222 | return -ENOSPC; | |
2223 | return num_slots; | |
2224 | } | |
2225 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); | |
2226 | ||
2227 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, | |
2228 | struct drm_dp_vcpi *vcpi, int pbn) | |
2229 | { | |
2230 | int num_slots; | |
2231 | int ret; | |
2232 | ||
2233 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2234 | ||
2235 | if (num_slots > mgr->avail_slots) | |
2236 | return -ENOSPC; | |
2237 | ||
2238 | vcpi->pbn = pbn; | |
2239 | vcpi->aligned_pbn = num_slots * mgr->pbn_div; | |
2240 | vcpi->num_slots = num_slots; | |
2241 | ||
2242 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); | |
2243 | if (ret < 0) | |
2244 | return ret; | |
2245 | return 0; | |
2246 | } | |
2247 | ||
2248 | /** | |
2249 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel | |
2250 | * @mgr: manager for this port | |
2251 | * @port: port to allocate a virtual channel for. | |
2252 | * @pbn: payload bandwidth number to request | |
2253 | * @slots: returned number of slots for this PBN. | |
2254 | */ | |
2255 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) | |
2256 | { | |
2257 | int ret; | |
2258 | ||
2259 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2260 | if (!port) | |
2261 | return false; | |
2262 | ||
2263 | if (port->vcpi.vcpi > 0) { | |
2264 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); | |
2265 | if (pbn == port->vcpi.pbn) { | |
2266 | *slots = port->vcpi.num_slots; | |
2267 | return true; | |
2268 | } | |
2269 | } | |
2270 | ||
2271 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); | |
2272 | if (ret) { | |
2273 | DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); | |
2274 | goto out; | |
2275 | } | |
2276 | DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); | |
2277 | *slots = port->vcpi.num_slots; | |
2278 | ||
2279 | drm_dp_put_port(port); | |
2280 | return true; | |
2281 | out: | |
2282 | return false; | |
2283 | } | |
2284 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); | |
2285 | ||
2286 | /** | |
2287 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI | |
2288 | * @mgr: manager for this port | |
2289 | * @port: unverified pointer to a port. | |
2290 | * | |
2291 | * This just resets the number of slots for the ports VCPI for later programming. | |
2292 | */ | |
2293 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2294 | { | |
2295 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2296 | if (!port) | |
2297 | return; | |
2298 | port->vcpi.num_slots = 0; | |
2299 | drm_dp_put_port(port); | |
2300 | } | |
2301 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); | |
2302 | ||
2303 | /** | |
2304 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI | |
2305 | * @mgr: manager for this port | |
2306 | * @port: unverified port to deallocate vcpi for | |
2307 | */ | |
2308 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2309 | { | |
2310 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2311 | if (!port) | |
2312 | return; | |
2313 | ||
2314 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
2315 | port->vcpi.num_slots = 0; | |
2316 | port->vcpi.pbn = 0; | |
2317 | port->vcpi.aligned_pbn = 0; | |
2318 | port->vcpi.vcpi = 0; | |
2319 | drm_dp_put_port(port); | |
2320 | } | |
2321 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); | |
2322 | ||
2323 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
2324 | int id, struct drm_dp_payload *payload) | |
2325 | { | |
2326 | u8 payload_alloc[3], status; | |
2327 | int ret; | |
2328 | int retries = 0; | |
2329 | ||
2330 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, | |
2331 | DP_PAYLOAD_TABLE_UPDATED); | |
2332 | ||
2333 | payload_alloc[0] = id; | |
2334 | payload_alloc[1] = payload->start_slot; | |
2335 | payload_alloc[2] = payload->num_slots; | |
2336 | ||
2337 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); | |
2338 | if (ret != 3) { | |
2339 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); | |
2340 | goto fail; | |
2341 | } | |
2342 | ||
2343 | retry: | |
2344 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
2345 | if (ret < 0) { | |
2346 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
2347 | goto fail; | |
2348 | } | |
2349 | ||
2350 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { | |
2351 | retries++; | |
2352 | if (retries < 20) { | |
2353 | usleep_range(10000, 20000); | |
2354 | goto retry; | |
2355 | } | |
2356 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); | |
2357 | ret = -EINVAL; | |
2358 | goto fail; | |
2359 | } | |
2360 | ret = 0; | |
2361 | fail: | |
2362 | return ret; | |
2363 | } | |
2364 | ||
2365 | ||
2366 | /** | |
2367 | * drm_dp_check_act_status() - Check ACT handled status. | |
2368 | * @mgr: manager to use | |
2369 | * | |
2370 | * Check the payload status bits in the DPCD for ACT handled completion. | |
2371 | */ | |
2372 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) | |
2373 | { | |
2374 | u8 status; | |
2375 | int ret; | |
2376 | int count = 0; | |
2377 | ||
2378 | do { | |
2379 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
2380 | ||
2381 | if (ret < 0) { | |
2382 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
2383 | goto fail; | |
2384 | } | |
2385 | ||
2386 | if (status & DP_PAYLOAD_ACT_HANDLED) | |
2387 | break; | |
2388 | count++; | |
2389 | udelay(100); | |
2390 | ||
2391 | } while (count < 30); | |
2392 | ||
2393 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { | |
2394 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); | |
2395 | ret = -EINVAL; | |
2396 | goto fail; | |
2397 | } | |
2398 | return 0; | |
2399 | fail: | |
2400 | return ret; | |
2401 | } | |
2402 | EXPORT_SYMBOL(drm_dp_check_act_status); | |
2403 | ||
2404 | /** | |
2405 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. | |
2406 | * @clock: dot clock for the mode | |
2407 | * @bpp: bpp for the mode. | |
2408 | * | |
2409 | * This uses the formula in the spec to calculate the PBN value for a mode. | |
2410 | */ | |
2411 | int drm_dp_calc_pbn_mode(int clock, int bpp) | |
2412 | { | |
2413 | fixed20_12 pix_bw; | |
2414 | fixed20_12 fbpp; | |
2415 | fixed20_12 result; | |
2416 | fixed20_12 margin, tmp; | |
2417 | u32 res; | |
2418 | ||
2419 | pix_bw.full = dfixed_const(clock); | |
2420 | fbpp.full = dfixed_const(bpp); | |
2421 | tmp.full = dfixed_const(8); | |
2422 | fbpp.full = dfixed_div(fbpp, tmp); | |
2423 | ||
2424 | result.full = dfixed_mul(pix_bw, fbpp); | |
2425 | margin.full = dfixed_const(54); | |
2426 | tmp.full = dfixed_const(64); | |
2427 | margin.full = dfixed_div(margin, tmp); | |
2428 | result.full = dfixed_div(result, margin); | |
2429 | ||
2430 | margin.full = dfixed_const(1006); | |
2431 | tmp.full = dfixed_const(1000); | |
2432 | margin.full = dfixed_div(margin, tmp); | |
2433 | result.full = dfixed_mul(result, margin); | |
2434 | ||
2435 | result.full = dfixed_div(result, tmp); | |
2436 | result.full = dfixed_ceil(result); | |
2437 | res = dfixed_trunc(result); | |
2438 | return res; | |
2439 | } | |
2440 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); | |
2441 | ||
2442 | static int test_calc_pbn_mode(void) | |
2443 | { | |
2444 | int ret; | |
2445 | ret = drm_dp_calc_pbn_mode(154000, 30); | |
2446 | if (ret != 689) | |
2447 | return -EINVAL; | |
2448 | ret = drm_dp_calc_pbn_mode(234000, 30); | |
2449 | if (ret != 1047) | |
2450 | return -EINVAL; | |
2451 | return 0; | |
2452 | } | |
2453 | ||
2454 | /* we want to kick the TX after we've ack the up/down IRQs. */ | |
2455 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) | |
2456 | { | |
2457 | queue_work(system_long_wq, &mgr->tx_work); | |
2458 | } | |
2459 | ||
2460 | static void drm_dp_mst_dump_mstb(struct seq_file *m, | |
2461 | struct drm_dp_mst_branch *mstb) | |
2462 | { | |
2463 | struct drm_dp_mst_port *port; | |
2464 | int tabs = mstb->lct; | |
2465 | char prefix[10]; | |
2466 | int i; | |
2467 | ||
2468 | for (i = 0; i < tabs; i++) | |
2469 | prefix[i] = '\t'; | |
2470 | prefix[i] = '\0'; | |
2471 | ||
2472 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); | |
2473 | list_for_each_entry(port, &mstb->ports, next) { | |
2474 | seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); | |
2475 | if (port->mstb) | |
2476 | drm_dp_mst_dump_mstb(m, port->mstb); | |
2477 | } | |
2478 | } | |
2479 | ||
2480 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
2481 | char *buf) | |
2482 | { | |
2483 | int ret; | |
2484 | int i; | |
2485 | for (i = 0; i < 4; i++) { | |
2486 | ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); | |
2487 | if (ret != 16) | |
2488 | break; | |
2489 | } | |
2490 | if (i == 4) | |
2491 | return true; | |
2492 | return false; | |
2493 | } | |
2494 | ||
2495 | /** | |
2496 | * drm_dp_mst_dump_topology(): dump topology to seq file. | |
2497 | * @m: seq_file to dump output to | |
2498 | * @mgr: manager to dump current topology for. | |
2499 | * | |
2500 | * helper to dump MST topology to a seq file for debugfs. | |
2501 | */ | |
2502 | void drm_dp_mst_dump_topology(struct seq_file *m, | |
2503 | struct drm_dp_mst_topology_mgr *mgr) | |
2504 | { | |
2505 | int i; | |
2506 | struct drm_dp_mst_port *port; | |
2507 | mutex_lock(&mgr->lock); | |
2508 | if (mgr->mst_primary) | |
2509 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); | |
2510 | ||
2511 | /* dump VCPIs */ | |
2512 | mutex_unlock(&mgr->lock); | |
2513 | ||
2514 | mutex_lock(&mgr->payload_lock); | |
dfda0df3 | 2515 | seq_printf(m, "vcpi: %lx %lx\n", mgr->payload_mask, mgr->vcpi_mask); |
ad7f8a1f DA |
2516 | |
2517 | for (i = 0; i < mgr->max_payloads; i++) { | |
2518 | if (mgr->proposed_vcpis[i]) { | |
2519 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
2520 | seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, port->vcpi.vcpi, port->vcpi.num_slots); | |
2521 | } else | |
2522 | seq_printf(m, "vcpi %d:unsed\n", i); | |
2523 | } | |
2524 | for (i = 0; i < mgr->max_payloads; i++) { | |
2525 | seq_printf(m, "payload %d: %d, %d, %d\n", | |
2526 | i, | |
2527 | mgr->payloads[i].payload_state, | |
2528 | mgr->payloads[i].start_slot, | |
2529 | mgr->payloads[i].num_slots); | |
2530 | ||
2531 | ||
2532 | } | |
2533 | mutex_unlock(&mgr->payload_lock); | |
2534 | ||
2535 | mutex_lock(&mgr->lock); | |
2536 | if (mgr->mst_primary) { | |
2537 | u8 buf[64]; | |
2538 | bool bret; | |
2539 | int ret; | |
2540 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); | |
2541 | seq_printf(m, "dpcd: "); | |
2542 | for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) | |
2543 | seq_printf(m, "%02x ", buf[i]); | |
2544 | seq_printf(m, "\n"); | |
2545 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); | |
2546 | seq_printf(m, "faux/mst: "); | |
2547 | for (i = 0; i < 2; i++) | |
2548 | seq_printf(m, "%02x ", buf[i]); | |
2549 | seq_printf(m, "\n"); | |
2550 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); | |
2551 | seq_printf(m, "mst ctrl: "); | |
2552 | for (i = 0; i < 1; i++) | |
2553 | seq_printf(m, "%02x ", buf[i]); | |
2554 | seq_printf(m, "\n"); | |
2555 | ||
2556 | bret = dump_dp_payload_table(mgr, buf); | |
2557 | if (bret == true) { | |
2558 | seq_printf(m, "payload table: "); | |
2559 | for (i = 0; i < 63; i++) | |
2560 | seq_printf(m, "%02x ", buf[i]); | |
2561 | seq_printf(m, "\n"); | |
2562 | } | |
2563 | ||
2564 | } | |
2565 | ||
2566 | mutex_unlock(&mgr->lock); | |
2567 | ||
2568 | } | |
2569 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); | |
2570 | ||
2571 | static void drm_dp_tx_work(struct work_struct *work) | |
2572 | { | |
2573 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); | |
2574 | ||
2575 | mutex_lock(&mgr->qlock); | |
2576 | if (mgr->tx_down_in_progress) | |
2577 | process_single_down_tx_qlock(mgr); | |
2578 | mutex_unlock(&mgr->qlock); | |
2579 | } | |
2580 | ||
2581 | /** | |
2582 | * drm_dp_mst_topology_mgr_init - initialise a topology manager | |
2583 | * @mgr: manager struct to initialise | |
2584 | * @dev: device providing this structure - for i2c addition. | |
2585 | * @aux: DP helper aux channel to talk to this device | |
2586 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit | |
2587 | * @max_payloads: maximum number of payloads this GPU can source | |
2588 | * @conn_base_id: the connector object ID the MST device is connected to. | |
2589 | * | |
2590 | * Return 0 for success, or negative error code on failure | |
2591 | */ | |
2592 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, | |
2593 | struct device *dev, struct drm_dp_aux *aux, | |
2594 | int max_dpcd_transaction_bytes, | |
2595 | int max_payloads, int conn_base_id) | |
2596 | { | |
2597 | mutex_init(&mgr->lock); | |
2598 | mutex_init(&mgr->qlock); | |
2599 | mutex_init(&mgr->payload_lock); | |
2600 | INIT_LIST_HEAD(&mgr->tx_msg_upq); | |
2601 | INIT_LIST_HEAD(&mgr->tx_msg_downq); | |
2602 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); | |
2603 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); | |
2604 | init_waitqueue_head(&mgr->tx_waitq); | |
2605 | mgr->dev = dev; | |
2606 | mgr->aux = aux; | |
2607 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; | |
2608 | mgr->max_payloads = max_payloads; | |
2609 | mgr->conn_base_id = conn_base_id; | |
2610 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); | |
2611 | if (!mgr->payloads) | |
2612 | return -ENOMEM; | |
2613 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); | |
2614 | if (!mgr->proposed_vcpis) | |
2615 | return -ENOMEM; | |
2616 | set_bit(0, &mgr->payload_mask); | |
2617 | test_calc_pbn_mode(); | |
2618 | return 0; | |
2619 | } | |
2620 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); | |
2621 | ||
2622 | /** | |
2623 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. | |
2624 | * @mgr: manager to destroy | |
2625 | */ | |
2626 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) | |
2627 | { | |
2628 | mutex_lock(&mgr->payload_lock); | |
2629 | kfree(mgr->payloads); | |
2630 | mgr->payloads = NULL; | |
2631 | kfree(mgr->proposed_vcpis); | |
2632 | mgr->proposed_vcpis = NULL; | |
2633 | mutex_unlock(&mgr->payload_lock); | |
2634 | mgr->dev = NULL; | |
2635 | mgr->aux = NULL; | |
2636 | } | |
2637 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); | |
2638 | ||
2639 | /* I2C device */ | |
2640 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, | |
2641 | int num) | |
2642 | { | |
2643 | struct drm_dp_aux *aux = adapter->algo_data; | |
2644 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); | |
2645 | struct drm_dp_mst_branch *mstb; | |
2646 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
2647 | unsigned int i; | |
2648 | bool reading = false; | |
2649 | struct drm_dp_sideband_msg_req_body msg; | |
2650 | struct drm_dp_sideband_msg_tx *txmsg = NULL; | |
2651 | int ret; | |
2652 | ||
2653 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
2654 | if (!mstb) | |
2655 | return -EREMOTEIO; | |
2656 | ||
2657 | /* construct i2c msg */ | |
2658 | /* see if last msg is a read */ | |
2659 | if (msgs[num - 1].flags & I2C_M_RD) | |
2660 | reading = true; | |
2661 | ||
2662 | if (!reading) { | |
2663 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); | |
2664 | ret = -EIO; | |
2665 | goto out; | |
2666 | } | |
2667 | ||
2668 | msg.req_type = DP_REMOTE_I2C_READ; | |
2669 | msg.u.i2c_read.num_transactions = num - 1; | |
2670 | msg.u.i2c_read.port_number = port->port_num; | |
2671 | for (i = 0; i < num - 1; i++) { | |
2672 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; | |
2673 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; | |
2674 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; | |
2675 | } | |
2676 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; | |
2677 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; | |
2678 | ||
2679 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2680 | if (!txmsg) { | |
2681 | ret = -ENOMEM; | |
2682 | goto out; | |
2683 | } | |
2684 | ||
2685 | txmsg->dst = mstb; | |
2686 | drm_dp_encode_sideband_req(&msg, txmsg); | |
2687 | ||
2688 | drm_dp_queue_down_tx(mgr, txmsg); | |
2689 | ||
2690 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
2691 | if (ret > 0) { | |
2692 | ||
2693 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ | |
2694 | ret = -EREMOTEIO; | |
2695 | goto out; | |
2696 | } | |
2697 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { | |
2698 | ret = -EIO; | |
2699 | goto out; | |
2700 | } | |
2701 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); | |
2702 | ret = num; | |
2703 | } | |
2704 | out: | |
2705 | kfree(txmsg); | |
2706 | drm_dp_put_mst_branch_device(mstb); | |
2707 | return ret; | |
2708 | } | |
2709 | ||
2710 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) | |
2711 | { | |
2712 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | | |
2713 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | | |
2714 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | | |
2715 | I2C_FUNC_10BIT_ADDR; | |
2716 | } | |
2717 | ||
2718 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { | |
2719 | .functionality = drm_dp_mst_i2c_functionality, | |
2720 | .master_xfer = drm_dp_mst_i2c_xfer, | |
2721 | }; | |
2722 | ||
2723 | /** | |
2724 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX | |
2725 | * @aux: DisplayPort AUX channel | |
2726 | * | |
2727 | * Returns 0 on success or a negative error code on failure. | |
2728 | */ | |
2729 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) | |
2730 | { | |
2731 | aux->ddc.algo = &drm_dp_mst_i2c_algo; | |
2732 | aux->ddc.algo_data = aux; | |
2733 | aux->ddc.retries = 3; | |
2734 | ||
2735 | aux->ddc.class = I2C_CLASS_DDC; | |
2736 | aux->ddc.owner = THIS_MODULE; | |
2737 | aux->ddc.dev.parent = aux->dev; | |
2738 | aux->ddc.dev.of_node = aux->dev->of_node; | |
2739 | ||
2740 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), | |
2741 | sizeof(aux->ddc.name)); | |
2742 | ||
2743 | return i2c_add_adapter(&aux->ddc); | |
2744 | } | |
2745 | ||
2746 | /** | |
2747 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter | |
2748 | * @aux: DisplayPort AUX channel | |
2749 | */ | |
2750 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) | |
2751 | { | |
2752 | i2c_del_adapter(&aux->ddc); | |
2753 | } |