blob: f7e292bf2baff049e852f3a73f0c5a6656c65a58 [file] [log] [blame]
Dave Airliead7f8a12014-06-05 14:01:32 +10001/*
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>
Dave Airlie75bc08a2014-07-09 11:15:09 +100028#include <linux/seq_file.h>
Dave Airliead7f8a12014-06-05 14:01:32 +100029#include <linux/i2c.h>
30#include <drm/drm_dp_mst_helper.h>
31#include <drm/drmP.h>
32
33#include <drm/drm_fixed.h>
Ville Syrjäläa4370c72017-07-12 18:51:02 +030034#include <drm/drm_atomic.h>
35#include <drm/drm_atomic_helper.h>
Dave Airliead7f8a12014-06-05 14:01:32 +100036
37/**
38 * DOC: dp mst helper
39 *
40 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
41 * protocol. The helpers contain a topology manager and bandwidth manager.
42 * The helpers encapsulate the sending and received of sideband msgs.
43 */
44static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
45 char *buf);
46static int test_calc_pbn_mode(void);
47
48static void drm_dp_put_port(struct drm_dp_mst_port *port);
49
50static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
51 int id,
52 struct drm_dp_payload *payload);
53
54static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
55 struct drm_dp_mst_port *port,
56 int offset, int size, u8 *bytes);
57
Dave Airlie68d8c9f2015-09-06 18:53:00 +100058static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
59 struct drm_dp_mst_branch *mstb);
Dave Airliead7f8a12014-06-05 14:01:32 +100060static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
61 struct drm_dp_mst_branch *mstb,
62 struct drm_dp_mst_port *port);
63static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
64 u8 *guid);
65
66static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
67static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
68static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
69/* sideband msg handling */
70static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
71{
72 u8 bitmask = 0x80;
73 u8 bitshift = 7;
74 u8 array_index = 0;
75 int number_of_bits = num_nibbles * 4;
76 u8 remainder = 0;
77
78 while (number_of_bits != 0) {
79 number_of_bits--;
80 remainder <<= 1;
81 remainder |= (data[array_index] & bitmask) >> bitshift;
82 bitmask >>= 1;
83 bitshift--;
84 if (bitmask == 0) {
85 bitmask = 0x80;
86 bitshift = 7;
87 array_index++;
88 }
89 if ((remainder & 0x10) == 0x10)
90 remainder ^= 0x13;
91 }
92
93 number_of_bits = 4;
94 while (number_of_bits != 0) {
95 number_of_bits--;
96 remainder <<= 1;
97 if ((remainder & 0x10) != 0)
98 remainder ^= 0x13;
99 }
100
101 return remainder;
102}
103
104static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
105{
106 u8 bitmask = 0x80;
107 u8 bitshift = 7;
108 u8 array_index = 0;
109 int number_of_bits = number_of_bytes * 8;
110 u16 remainder = 0;
111
112 while (number_of_bits != 0) {
113 number_of_bits--;
114 remainder <<= 1;
115 remainder |= (data[array_index] & bitmask) >> bitshift;
116 bitmask >>= 1;
117 bitshift--;
118 if (bitmask == 0) {
119 bitmask = 0x80;
120 bitshift = 7;
121 array_index++;
122 }
123 if ((remainder & 0x100) == 0x100)
124 remainder ^= 0xd5;
125 }
126
127 number_of_bits = 8;
128 while (number_of_bits != 0) {
129 number_of_bits--;
130 remainder <<= 1;
131 if ((remainder & 0x100) != 0)
132 remainder ^= 0xd5;
133 }
134
135 return remainder & 0xff;
136}
137static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
138{
139 u8 size = 3;
140 size += (hdr->lct / 2);
141 return size;
142}
143
144static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
145 u8 *buf, int *len)
146{
147 int idx = 0;
148 int i;
149 u8 crc4;
150 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
151 for (i = 0; i < (hdr->lct / 2); i++)
152 buf[idx++] = hdr->rad[i];
153 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
154 (hdr->msg_len & 0x3f);
155 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
156
157 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
158 buf[idx - 1] |= (crc4 & 0xf);
159
160 *len = idx;
161}
162
163static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
164 u8 *buf, int buflen, u8 *hdrlen)
165{
166 u8 crc4;
167 u8 len;
168 int i;
169 u8 idx;
170 if (buf[0] == 0)
171 return false;
172 len = 3;
173 len += ((buf[0] & 0xf0) >> 4) / 2;
174 if (len > buflen)
175 return false;
176 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
177
178 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
179 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
180 return false;
181 }
182
183 hdr->lct = (buf[0] & 0xf0) >> 4;
184 hdr->lcr = (buf[0] & 0xf);
185 idx = 1;
186 for (i = 0; i < (hdr->lct / 2); i++)
187 hdr->rad[i] = buf[idx++];
188 hdr->broadcast = (buf[idx] >> 7) & 0x1;
189 hdr->path_msg = (buf[idx] >> 6) & 0x1;
190 hdr->msg_len = buf[idx] & 0x3f;
191 idx++;
192 hdr->somt = (buf[idx] >> 7) & 0x1;
193 hdr->eomt = (buf[idx] >> 6) & 0x1;
194 hdr->seqno = (buf[idx] >> 4) & 0x1;
195 idx++;
196 *hdrlen = idx;
197 return true;
198}
199
200static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
201 struct drm_dp_sideband_msg_tx *raw)
202{
203 int idx = 0;
204 int i;
205 u8 *buf = raw->msg;
206 buf[idx++] = req->req_type & 0x7f;
207
208 switch (req->req_type) {
209 case DP_ENUM_PATH_RESOURCES:
210 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
211 idx++;
212 break;
213 case DP_ALLOCATE_PAYLOAD:
214 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
215 (req->u.allocate_payload.number_sdp_streams & 0xf);
216 idx++;
217 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
218 idx++;
219 buf[idx] = (req->u.allocate_payload.pbn >> 8);
220 idx++;
221 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
222 idx++;
223 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
224 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
225 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
226 idx++;
227 }
228 if (req->u.allocate_payload.number_sdp_streams & 1) {
229 i = req->u.allocate_payload.number_sdp_streams - 1;
230 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
231 idx++;
232 }
233 break;
234 case DP_QUERY_PAYLOAD:
235 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
236 idx++;
237 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
238 idx++;
239 break;
240 case DP_REMOTE_DPCD_READ:
241 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
242 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
243 idx++;
244 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
245 idx++;
246 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
247 idx++;
248 buf[idx] = (req->u.dpcd_read.num_bytes);
249 idx++;
250 break;
251
252 case DP_REMOTE_DPCD_WRITE:
253 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
254 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
255 idx++;
256 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
257 idx++;
258 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
259 idx++;
260 buf[idx] = (req->u.dpcd_write.num_bytes);
261 idx++;
262 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
263 idx += req->u.dpcd_write.num_bytes;
264 break;
265 case DP_REMOTE_I2C_READ:
266 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
267 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
268 idx++;
269 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
270 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
271 idx++;
272 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
273 idx++;
274 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
275 idx += req->u.i2c_read.transactions[i].num_bytes;
276
277 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
278 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
279 idx++;
280 }
281 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
282 idx++;
283 buf[idx] = (req->u.i2c_read.num_bytes_read);
284 idx++;
285 break;
286
287 case DP_REMOTE_I2C_WRITE:
288 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
289 idx++;
290 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
291 idx++;
292 buf[idx] = (req->u.i2c_write.num_bytes);
293 idx++;
294 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
295 idx += req->u.i2c_write.num_bytes;
296 break;
297 }
298 raw->cur_len = idx;
299}
300
301static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
302{
303 u8 crc4;
304 crc4 = drm_dp_msg_data_crc4(msg, len);
305 msg[len] = crc4;
306}
307
308static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
309 struct drm_dp_sideband_msg_tx *raw)
310{
311 int idx = 0;
312 u8 *buf = raw->msg;
313
314 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
315
316 raw->cur_len = idx;
317}
318
319/* this adds a chunk of msg to the builder to get the final msg */
320static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
321 u8 *replybuf, u8 replybuflen, bool hdr)
322{
323 int ret;
324 u8 crc4;
325
326 if (hdr) {
327 u8 hdrlen;
328 struct drm_dp_sideband_msg_hdr recv_hdr;
329 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
330 if (ret == false) {
331 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
332 return false;
333 }
334
335 /* get length contained in this portion */
336 msg->curchunk_len = recv_hdr.msg_len;
337 msg->curchunk_hdrlen = hdrlen;
338
339 /* we have already gotten an somt - don't bother parsing */
340 if (recv_hdr.somt && msg->have_somt)
341 return false;
342
343 if (recv_hdr.somt) {
344 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
345 msg->have_somt = true;
346 }
347 if (recv_hdr.eomt)
348 msg->have_eomt = true;
349
350 /* copy the bytes for the remainder of this header chunk */
351 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
352 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
353 } else {
354 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
355 msg->curchunk_idx += replybuflen;
356 }
357
358 if (msg->curchunk_idx >= msg->curchunk_len) {
359 /* do CRC */
360 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
361 /* copy chunk into bigger msg */
362 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
363 msg->curlen += msg->curchunk_len - 1;
364 }
365 return true;
366}
367
368static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
369 struct drm_dp_sideband_msg_reply_body *repmsg)
370{
371 int idx = 1;
372 int i;
373 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
374 idx += 16;
375 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
376 idx++;
377 if (idx > raw->curlen)
378 goto fail_len;
379 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
380 if (raw->msg[idx] & 0x80)
381 repmsg->u.link_addr.ports[i].input_port = 1;
382
383 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
384 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
385
386 idx++;
387 if (idx > raw->curlen)
388 goto fail_len;
389 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
390 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
391 if (repmsg->u.link_addr.ports[i].input_port == 0)
392 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
393 idx++;
394 if (idx > raw->curlen)
395 goto fail_len;
396 if (repmsg->u.link_addr.ports[i].input_port == 0) {
397 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
398 idx++;
399 if (idx > raw->curlen)
400 goto fail_len;
401 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
402 idx += 16;
403 if (idx > raw->curlen)
404 goto fail_len;
405 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
406 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
407 idx++;
408
409 }
410 if (idx > raw->curlen)
411 goto fail_len;
412 }
413
414 return true;
415fail_len:
416 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
417 return false;
418}
419
420static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
421 struct drm_dp_sideband_msg_reply_body *repmsg)
422{
423 int idx = 1;
424 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
425 idx++;
426 if (idx > raw->curlen)
427 goto fail_len;
428 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
429 if (idx > raw->curlen)
430 goto fail_len;
431
432 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
433 return true;
434fail_len:
435 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
436 return false;
437}
438
439static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
440 struct drm_dp_sideband_msg_reply_body *repmsg)
441{
442 int idx = 1;
443 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
444 idx++;
445 if (idx > raw->curlen)
446 goto fail_len;
447 return true;
448fail_len:
449 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
450 return false;
451}
452
453static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
454 struct drm_dp_sideband_msg_reply_body *repmsg)
455{
456 int idx = 1;
457
458 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
459 idx++;
460 if (idx > raw->curlen)
461 goto fail_len;
462 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
463 idx++;
464 /* TODO check */
465 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
466 return true;
467fail_len:
468 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
469 return false;
470}
471
472static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
473 struct drm_dp_sideband_msg_reply_body *repmsg)
474{
475 int idx = 1;
476 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
477 idx++;
478 if (idx > raw->curlen)
479 goto fail_len;
480 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
481 idx += 2;
482 if (idx > raw->curlen)
483 goto fail_len;
484 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
485 idx += 2;
486 if (idx > raw->curlen)
487 goto fail_len;
488 return true;
489fail_len:
490 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
491 return false;
492}
493
494static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
495 struct drm_dp_sideband_msg_reply_body *repmsg)
496{
497 int idx = 1;
498 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
499 idx++;
500 if (idx > raw->curlen)
501 goto fail_len;
502 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
503 idx++;
504 if (idx > raw->curlen)
505 goto fail_len;
506 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
507 idx += 2;
508 if (idx > raw->curlen)
509 goto fail_len;
510 return true;
511fail_len:
512 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
513 return false;
514}
515
516static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
517 struct drm_dp_sideband_msg_reply_body *repmsg)
518{
519 int idx = 1;
520 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
521 idx++;
522 if (idx > raw->curlen)
523 goto fail_len;
524 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
525 idx += 2;
526 if (idx > raw->curlen)
527 goto fail_len;
528 return true;
529fail_len:
530 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
531 return false;
532}
533
534static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
535 struct drm_dp_sideband_msg_reply_body *msg)
536{
537 memset(msg, 0, sizeof(*msg));
538 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
539 msg->req_type = (raw->msg[0] & 0x7f);
540
541 if (msg->reply_type) {
542 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
543 msg->u.nak.reason = raw->msg[17];
544 msg->u.nak.nak_data = raw->msg[18];
545 return false;
546 }
547
548 switch (msg->req_type) {
549 case DP_LINK_ADDRESS:
550 return drm_dp_sideband_parse_link_address(raw, msg);
551 case DP_QUERY_PAYLOAD:
552 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
553 case DP_REMOTE_DPCD_READ:
554 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
555 case DP_REMOTE_DPCD_WRITE:
556 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
557 case DP_REMOTE_I2C_READ:
558 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
559 case DP_ENUM_PATH_RESOURCES:
560 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
561 case DP_ALLOCATE_PAYLOAD:
562 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
563 default:
564 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
565 return false;
566 }
567}
568
569static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
570 struct drm_dp_sideband_msg_req_body *msg)
571{
572 int idx = 1;
573
574 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
575 idx++;
576 if (idx > raw->curlen)
577 goto fail_len;
578
579 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
580 idx += 16;
581 if (idx > raw->curlen)
582 goto fail_len;
583
584 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
585 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
586 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
587 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
588 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
589 idx++;
590 return true;
591fail_len:
592 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
593 return false;
594}
595
596static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
597 struct drm_dp_sideband_msg_req_body *msg)
598{
599 int idx = 1;
600
601 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
602 idx++;
603 if (idx > raw->curlen)
604 goto fail_len;
605
606 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
607 idx += 16;
608 if (idx > raw->curlen)
609 goto fail_len;
610
611 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
612 idx++;
613 return true;
614fail_len:
615 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
616 return false;
617}
618
619static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
620 struct drm_dp_sideband_msg_req_body *msg)
621{
622 memset(msg, 0, sizeof(*msg));
623 msg->req_type = (raw->msg[0] & 0x7f);
624
625 switch (msg->req_type) {
626 case DP_CONNECTION_STATUS_NOTIFY:
627 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
628 case DP_RESOURCE_STATUS_NOTIFY:
629 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
630 default:
631 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
632 return false;
633 }
634}
635
636static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
637{
638 struct drm_dp_sideband_msg_req_body req;
639
640 req.req_type = DP_REMOTE_DPCD_WRITE;
641 req.u.dpcd_write.port_number = port_num;
642 req.u.dpcd_write.dpcd_address = offset;
643 req.u.dpcd_write.num_bytes = num_bytes;
644 req.u.dpcd_write.bytes = bytes;
645 drm_dp_encode_sideband_req(&req, msg);
646
647 return 0;
648}
649
650static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
651{
652 struct drm_dp_sideband_msg_req_body req;
653
654 req.req_type = DP_LINK_ADDRESS;
655 drm_dp_encode_sideband_req(&req, msg);
656 return 0;
657}
658
659static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
660{
661 struct drm_dp_sideband_msg_req_body req;
662
663 req.req_type = DP_ENUM_PATH_RESOURCES;
664 req.u.port_num.port_number = port_num;
665 drm_dp_encode_sideband_req(&req, msg);
666 msg->path_msg = true;
667 return 0;
668}
669
670static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
Libin Yangef8f9be2015-12-02 14:09:43 +0800671 u8 vcpi, uint16_t pbn,
672 u8 number_sdp_streams,
673 u8 *sdp_stream_sink)
Dave Airliead7f8a12014-06-05 14:01:32 +1000674{
675 struct drm_dp_sideband_msg_req_body req;
676 memset(&req, 0, sizeof(req));
677 req.req_type = DP_ALLOCATE_PAYLOAD;
678 req.u.allocate_payload.port_number = port_num;
679 req.u.allocate_payload.vcpi = vcpi;
680 req.u.allocate_payload.pbn = pbn;
Libin Yangef8f9be2015-12-02 14:09:43 +0800681 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
682 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
683 number_sdp_streams);
Dave Airliead7f8a12014-06-05 14:01:32 +1000684 drm_dp_encode_sideband_req(&req, msg);
685 msg->path_msg = true;
686 return 0;
687}
688
689static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
690 struct drm_dp_vcpi *vcpi)
691{
Dave Airliedfda0df2014-08-06 16:26:21 +1000692 int ret, vcpi_ret;
Dave Airliead7f8a12014-06-05 14:01:32 +1000693
694 mutex_lock(&mgr->payload_lock);
695 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
696 if (ret > mgr->max_payloads) {
697 ret = -EINVAL;
698 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
699 goto out_unlock;
700 }
701
Dave Airliedfda0df2014-08-06 16:26:21 +1000702 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
703 if (vcpi_ret > mgr->max_payloads) {
704 ret = -EINVAL;
705 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
706 goto out_unlock;
707 }
708
Dave Airliead7f8a12014-06-05 14:01:32 +1000709 set_bit(ret, &mgr->payload_mask);
Dave Airliedfda0df2014-08-06 16:26:21 +1000710 set_bit(vcpi_ret, &mgr->vcpi_mask);
711 vcpi->vcpi = vcpi_ret + 1;
Dave Airliead7f8a12014-06-05 14:01:32 +1000712 mgr->proposed_vcpis[ret - 1] = vcpi;
713out_unlock:
714 mutex_unlock(&mgr->payload_lock);
715 return ret;
716}
717
718static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
Dave Airliedfda0df2014-08-06 16:26:21 +1000719 int vcpi)
Dave Airliead7f8a12014-06-05 14:01:32 +1000720{
Dave Airliedfda0df2014-08-06 16:26:21 +1000721 int i;
722 if (vcpi == 0)
Dave Airliead7f8a12014-06-05 14:01:32 +1000723 return;
724
725 mutex_lock(&mgr->payload_lock);
Dave Airliedfda0df2014-08-06 16:26:21 +1000726 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
727 clear_bit(vcpi - 1, &mgr->vcpi_mask);
728
729 for (i = 0; i < mgr->max_payloads; i++) {
730 if (mgr->proposed_vcpis[i])
731 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
732 mgr->proposed_vcpis[i] = NULL;
733 clear_bit(i + 1, &mgr->payload_mask);
734 }
735 }
Dave Airliead7f8a12014-06-05 14:01:32 +1000736 mutex_unlock(&mgr->payload_lock);
737}
738
739static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
740 struct drm_dp_sideband_msg_tx *txmsg)
741{
Chris Wilson992d38c2017-05-13 11:52:00 +0100742 unsigned int state;
Daniel Vettercd961bb2015-01-28 10:02:23 +0100743
744 /*
745 * All updates to txmsg->state are protected by mgr->qlock, and the two
746 * cases we check here are terminal states. For those the barriers
747 * provided by the wake_up/wait_event pair are enough.
748 */
Chris Wilson992d38c2017-05-13 11:52:00 +0100749 state = READ_ONCE(txmsg->state);
750 return (state == DRM_DP_SIDEBAND_TX_RX ||
751 state == DRM_DP_SIDEBAND_TX_TIMEOUT);
Dave Airliead7f8a12014-06-05 14:01:32 +1000752}
753
754static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
755 struct drm_dp_sideband_msg_tx *txmsg)
756{
757 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
758 int ret;
759
760 ret = wait_event_timeout(mgr->tx_waitq,
761 check_txmsg_state(mgr, txmsg),
762 (4 * HZ));
763 mutex_lock(&mstb->mgr->qlock);
764 if (ret > 0) {
765 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
766 ret = -EIO;
767 goto out;
768 }
769 } else {
770 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
771
772 /* dump some state */
773 ret = -EIO;
774
775 /* remove from q */
776 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
777 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
778 list_del(&txmsg->next);
779 }
780
781 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
782 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
783 mstb->tx_slots[txmsg->seqno] = NULL;
784 }
785 }
786out:
787 mutex_unlock(&mgr->qlock);
788
789 return ret;
790}
791
792static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
793{
794 struct drm_dp_mst_branch *mstb;
795
796 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
797 if (!mstb)
798 return NULL;
799
800 mstb->lct = lct;
801 if (lct > 1)
802 memcpy(mstb->rad, rad, lct / 2);
803 INIT_LIST_HEAD(&mstb->ports);
804 kref_init(&mstb->kref);
805 return mstb;
806}
807
Mykola Lysenko91a25e42016-01-27 09:39:36 -0500808static void drm_dp_free_mst_port(struct kref *kref);
809
810static void drm_dp_free_mst_branch_device(struct kref *kref)
811{
812 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
813 if (mstb->port_parent) {
814 if (list_empty(&mstb->port_parent->next))
815 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
816 }
817 kfree(mstb);
818}
819
Dave Airliead7f8a12014-06-05 14:01:32 +1000820static void drm_dp_destroy_mst_branch_device(struct kref *kref)
821{
822 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
823 struct drm_dp_mst_port *port, *tmp;
824 bool wake_tx = false;
825
Dave Airliead7f8a12014-06-05 14:01:32 +1000826 /*
Mykola Lysenko91a25e42016-01-27 09:39:36 -0500827 * init kref again to be used by ports to remove mst branch when it is
828 * not needed anymore
829 */
830 kref_init(kref);
831
832 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
833 kref_get(&mstb->port_parent->kref);
834
835 /*
Dave Airliead7f8a12014-06-05 14:01:32 +1000836 * destroy all ports - don't need lock
837 * as there are no more references to the mst branch
838 * device at this point.
839 */
840 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
841 list_del(&port->next);
842 drm_dp_put_port(port);
843 }
844
845 /* drop any tx slots msg */
846 mutex_lock(&mstb->mgr->qlock);
847 if (mstb->tx_slots[0]) {
848 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
849 mstb->tx_slots[0] = NULL;
850 wake_tx = true;
851 }
852 if (mstb->tx_slots[1]) {
853 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
854 mstb->tx_slots[1] = NULL;
855 wake_tx = true;
856 }
857 mutex_unlock(&mstb->mgr->qlock);
858
859 if (wake_tx)
Chris Wilson68e989d2017-05-13 11:52:01 +0100860 wake_up_all(&mstb->mgr->tx_waitq);
Mykola Lysenko91a25e42016-01-27 09:39:36 -0500861
862 kref_put(kref, drm_dp_free_mst_branch_device);
Dave Airliead7f8a12014-06-05 14:01:32 +1000863}
864
865static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
866{
867 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
868}
869
870
871static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
872{
Daniel Vetter03913592014-12-08 22:55:22 +0100873 struct drm_dp_mst_branch *mstb;
874
Dave Airliead7f8a12014-06-05 14:01:32 +1000875 switch (old_pdt) {
876 case DP_PEER_DEVICE_DP_LEGACY_CONV:
877 case DP_PEER_DEVICE_SST_SINK:
878 /* remove i2c over sideband */
879 drm_dp_mst_unregister_i2c_bus(&port->aux);
880 break;
881 case DP_PEER_DEVICE_MST_BRANCHING:
Daniel Vetter03913592014-12-08 22:55:22 +0100882 mstb = port->mstb;
Dave Airliead7f8a12014-06-05 14:01:32 +1000883 port->mstb = NULL;
Daniel Vetter03913592014-12-08 22:55:22 +0100884 drm_dp_put_mst_branch_device(mstb);
Dave Airliead7f8a12014-06-05 14:01:32 +1000885 break;
886 }
887}
888
889static void drm_dp_destroy_port(struct kref *kref)
890{
891 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
892 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
Dave Airliedf4839f2015-09-16 10:37:28 +1000893
Dave Airliead7f8a12014-06-05 14:01:32 +1000894 if (!port->input) {
895 port->vcpi.num_slots = 0;
Dave Airliec6a0aed2014-10-20 16:28:02 +1000896
897 kfree(port->cached_edid);
Dave Airlie6b8eeca2015-06-15 10:34:28 +1000898
Dave Airliedf4839f2015-09-16 10:37:28 +1000899 /*
900 * The only time we don't have a connector
901 * on an output port is if the connector init
902 * fails.
903 */
Dave Airlie6b8eeca2015-06-15 10:34:28 +1000904 if (port->connector) {
Dave Airliedf4839f2015-09-16 10:37:28 +1000905 /* we can't destroy the connector here, as
906 * we might be holding the mode_config.mutex
907 * from an EDID retrieval */
908
Dave Airlie6b8eeca2015-06-15 10:34:28 +1000909 mutex_lock(&mgr->destroy_connector_lock);
Mykola Lysenko91a25e42016-01-27 09:39:36 -0500910 kref_get(&port->parent->kref);
Maarten Lankhorst4772ff02015-08-11 09:54:29 +0200911 list_add(&port->next, &mgr->destroy_connector_list);
Dave Airlie6b8eeca2015-06-15 10:34:28 +1000912 mutex_unlock(&mgr->destroy_connector_lock);
913 schedule_work(&mgr->destroy_connector_work);
Maarten Lankhorst4772ff02015-08-11 09:54:29 +0200914 return;
Dave Airlie6b8eeca2015-06-15 10:34:28 +1000915 }
Dave Airliedf4839f2015-09-16 10:37:28 +1000916 /* no need to clean up vcpi
917 * as if we have no connector we never setup a vcpi */
Dave Airliead7f8a12014-06-05 14:01:32 +1000918 drm_dp_port_teardown_pdt(port, port->pdt);
Ville Syrjälä36e3fa62016-10-26 16:30:33 +0300919 port->pdt = DP_PEER_DEVICE_NONE;
Dave Airliead7f8a12014-06-05 14:01:32 +1000920 }
921 kfree(port);
Dave Airliead7f8a12014-06-05 14:01:32 +1000922}
923
924static void drm_dp_put_port(struct drm_dp_mst_port *port)
925{
926 kref_put(&port->kref, drm_dp_destroy_port);
927}
928
929static 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)
930{
931 struct drm_dp_mst_port *port;
932 struct drm_dp_mst_branch *rmstb;
933 if (to_find == mstb) {
934 kref_get(&mstb->kref);
935 return mstb;
936 }
937 list_for_each_entry(port, &mstb->ports, next) {
938 if (port->mstb) {
939 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
940 if (rmstb)
941 return rmstb;
942 }
943 }
944 return NULL;
945}
946
947static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb)
948{
949 struct drm_dp_mst_branch *rmstb = NULL;
950 mutex_lock(&mgr->lock);
951 if (mgr->mst_primary)
952 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
953 mutex_unlock(&mgr->lock);
954 return rmstb;
955}
956
957static 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)
958{
959 struct drm_dp_mst_port *port, *mport;
960
961 list_for_each_entry(port, &mstb->ports, next) {
962 if (port == to_find) {
963 kref_get(&port->kref);
964 return port;
965 }
966 if (port->mstb) {
967 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
968 if (mport)
969 return mport;
970 }
971 }
972 return NULL;
973}
974
975static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
976{
977 struct drm_dp_mst_port *rport = NULL;
978 mutex_lock(&mgr->lock);
979 if (mgr->mst_primary)
980 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
981 mutex_unlock(&mgr->lock);
982 return rport;
983}
984
985static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
986{
987 struct drm_dp_mst_port *port;
988
989 list_for_each_entry(port, &mstb->ports, next) {
990 if (port->port_num == port_num) {
991 kref_get(&port->kref);
992 return port;
993 }
994 }
995
996 return NULL;
997}
998
999/*
1000 * calculate a new RAD for this MST branch device
1001 * if parent has an LCT of 2 then it has 1 nibble of RAD,
1002 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1003 */
1004static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1005 u8 *rad)
1006{
Mykola Lysenko75af4c82015-12-25 16:14:47 +08001007 int parent_lct = port->parent->lct;
Dave Airliead7f8a12014-06-05 14:01:32 +10001008 int shift = 4;
Mykola Lysenko75af4c82015-12-25 16:14:47 +08001009 int idx = (parent_lct - 1) / 2;
1010 if (parent_lct > 1) {
1011 memcpy(rad, port->parent->rad, idx + 1);
1012 shift = (parent_lct % 2) ? 4 : 0;
Dave Airliead7f8a12014-06-05 14:01:32 +10001013 } else
1014 rad[0] = 0;
1015
1016 rad[idx] |= port->port_num << shift;
Mykola Lysenko75af4c82015-12-25 16:14:47 +08001017 return parent_lct + 1;
Dave Airliead7f8a12014-06-05 14:01:32 +10001018}
1019
1020/*
1021 * return sends link address for new mstb
1022 */
1023static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1024{
1025 int ret;
1026 u8 rad[6], lct;
1027 bool send_link = false;
1028 switch (port->pdt) {
1029 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1030 case DP_PEER_DEVICE_SST_SINK:
1031 /* add i2c over sideband */
1032 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1033 break;
1034 case DP_PEER_DEVICE_MST_BRANCHING:
1035 lct = drm_dp_calculate_rad(port, rad);
1036
1037 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1038 port->mstb->mgr = port->mgr;
1039 port->mstb->port_parent = port;
1040
1041 send_link = true;
1042 break;
1043 }
1044 return send_link;
1045}
1046
Hersen Wu5e93b822016-01-22 17:07:28 -05001047static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
Dave Airliead7f8a12014-06-05 14:01:32 +10001048{
1049 int ret;
Hersen Wu5e93b822016-01-22 17:07:28 -05001050
1051 memcpy(mstb->guid, guid, 16);
1052
1053 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1054 if (mstb->port_parent) {
1055 ret = drm_dp_send_dpcd_write(
1056 mstb->mgr,
1057 mstb->port_parent,
1058 DP_GUID,
1059 16,
1060 mstb->guid);
1061 } else {
1062
1063 ret = drm_dp_dpcd_write(
1064 mstb->mgr->aux,
1065 DP_GUID,
1066 mstb->guid,
1067 16);
Dave Airliead7f8a12014-06-05 14:01:32 +10001068 }
1069 }
1070}
1071
Dave Airlie1c960872015-09-16 11:04:49 +10001072static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1073 int pnum,
Rickard Strandqvistd87af4d2014-10-12 00:02:32 +02001074 char *proppath,
1075 size_t proppath_size)
Dave Airliead7f8a12014-06-05 14:01:32 +10001076{
1077 int i;
1078 char temp[8];
Rickard Strandqvistd87af4d2014-10-12 00:02:32 +02001079 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
Dave Airliead7f8a12014-06-05 14:01:32 +10001080 for (i = 0; i < (mstb->lct - 1); i++) {
1081 int shift = (i % 2) ? 0 : 4;
Mykola Lysenko7a11a332015-12-25 16:14:48 +08001082 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
Rickard Strandqvistd87af4d2014-10-12 00:02:32 +02001083 snprintf(temp, sizeof(temp), "-%d", port_num);
1084 strlcat(proppath, temp, proppath_size);
Dave Airliead7f8a12014-06-05 14:01:32 +10001085 }
Dave Airlie1c960872015-09-16 11:04:49 +10001086 snprintf(temp, sizeof(temp), "-%d", pnum);
Rickard Strandqvistd87af4d2014-10-12 00:02:32 +02001087 strlcat(proppath, temp, proppath_size);
Dave Airliead7f8a12014-06-05 14:01:32 +10001088}
1089
1090static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
Dhinakaran Pandiyan7b0a89a2017-01-24 15:49:29 -08001091 struct drm_device *dev,
Dave Airliead7f8a12014-06-05 14:01:32 +10001092 struct drm_dp_link_addr_reply_port *port_msg)
1093{
1094 struct drm_dp_mst_port *port;
1095 bool ret;
1096 bool created = false;
1097 int old_pdt = 0;
1098 int old_ddps = 0;
1099 port = drm_dp_get_port(mstb, port_msg->port_number);
1100 if (!port) {
1101 port = kzalloc(sizeof(*port), GFP_KERNEL);
1102 if (!port)
1103 return;
1104 kref_init(&port->kref);
1105 port->parent = mstb;
1106 port->port_num = port_msg->port_number;
1107 port->mgr = mstb->mgr;
1108 port->aux.name = "DPMST";
Dhinakaran Pandiyan7b0a89a2017-01-24 15:49:29 -08001109 port->aux.dev = dev->dev;
Dave Airliead7f8a12014-06-05 14:01:32 +10001110 created = true;
1111 } else {
1112 old_pdt = port->pdt;
1113 old_ddps = port->ddps;
1114 }
1115
1116 port->pdt = port_msg->peer_device_type;
1117 port->input = port_msg->input_port;
1118 port->mcs = port_msg->mcs;
1119 port->ddps = port_msg->ddps;
1120 port->ldps = port_msg->legacy_device_plug_status;
1121 port->dpcd_rev = port_msg->dpcd_revision;
1122 port->num_sdp_streams = port_msg->num_sdp_streams;
1123 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
Dave Airliead7f8a12014-06-05 14:01:32 +10001124
1125 /* manage mstb port lists with mgr lock - take a reference
1126 for this list */
1127 if (created) {
1128 mutex_lock(&mstb->mgr->lock);
1129 kref_get(&port->kref);
1130 list_add(&port->next, &mstb->ports);
1131 mutex_unlock(&mstb->mgr->lock);
1132 }
1133
1134 if (old_ddps != port->ddps) {
1135 if (port->ddps) {
Dave Airliead7f8a12014-06-05 14:01:32 +10001136 if (!port->input)
1137 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1138 } else {
Dave Airliead7f8a12014-06-05 14:01:32 +10001139 port->available_pbn = 0;
1140 }
1141 }
1142
1143 if (old_pdt != port->pdt && !port->input) {
1144 drm_dp_port_teardown_pdt(port, old_pdt);
1145
1146 ret = drm_dp_port_setup_pdt(port);
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001147 if (ret == true)
Dave Airliead7f8a12014-06-05 14:01:32 +10001148 drm_dp_send_link_address(mstb->mgr, port->mstb);
Dave Airliead7f8a12014-06-05 14:01:32 +10001149 }
1150
1151 if (created && !port->input) {
1152 char proppath[255];
Dave Airlie1c960872015-09-16 11:04:49 +10001153
1154 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
Dave Airliead7f8a12014-06-05 14:01:32 +10001155 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
Dave Airliedf4839f2015-09-16 10:37:28 +10001156 if (!port->connector) {
1157 /* remove it from the port list */
1158 mutex_lock(&mstb->mgr->lock);
1159 list_del(&port->next);
1160 mutex_unlock(&mstb->mgr->lock);
1161 /* drop port list reference */
1162 drm_dp_put_port(port);
1163 goto out;
1164 }
Ville Syrjälä4da5caa2016-10-26 12:05:55 +03001165 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1166 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1167 port->port_num >= DP_MST_LOGICAL_PORT_0) {
Dave Airlie8ae22cb2016-02-17 11:36:38 +10001168 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1169 drm_mode_connector_set_tile_property(port->connector);
1170 }
Dave Airlied9515c52015-09-16 17:55:23 +10001171 (*mstb->mgr->cbs->register_connector)(port->connector);
Dave Airliead7f8a12014-06-05 14:01:32 +10001172 }
Dave Airlie8ae22cb2016-02-17 11:36:38 +10001173
Dave Airliedf4839f2015-09-16 10:37:28 +10001174out:
Dave Airliead7f8a12014-06-05 14:01:32 +10001175 /* put reference to this port */
1176 drm_dp_put_port(port);
1177}
1178
1179static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1180 struct drm_dp_connection_status_notify *conn_stat)
1181{
1182 struct drm_dp_mst_port *port;
1183 int old_pdt;
1184 int old_ddps;
1185 bool dowork = false;
1186 port = drm_dp_get_port(mstb, conn_stat->port_number);
1187 if (!port)
1188 return;
1189
1190 old_ddps = port->ddps;
1191 old_pdt = port->pdt;
1192 port->pdt = conn_stat->peer_device_type;
1193 port->mcs = conn_stat->message_capability_status;
1194 port->ldps = conn_stat->legacy_device_plug_status;
1195 port->ddps = conn_stat->displayport_device_plug_status;
1196
1197 if (old_ddps != port->ddps) {
1198 if (port->ddps) {
Dave Airlie8ae22cb2016-02-17 11:36:38 +10001199 dowork = true;
Dave Airliead7f8a12014-06-05 14:01:32 +10001200 } else {
Dave Airliead7f8a12014-06-05 14:01:32 +10001201 port->available_pbn = 0;
1202 }
1203 }
1204 if (old_pdt != port->pdt && !port->input) {
1205 drm_dp_port_teardown_pdt(port, old_pdt);
1206
1207 if (drm_dp_port_setup_pdt(port))
1208 dowork = true;
1209 }
1210
1211 drm_dp_put_port(port);
1212 if (dowork)
1213 queue_work(system_long_wq, &mstb->mgr->work);
1214
1215}
1216
1217static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1218 u8 lct, u8 *rad)
1219{
1220 struct drm_dp_mst_branch *mstb;
1221 struct drm_dp_mst_port *port;
1222 int i;
1223 /* find the port by iterating down */
Dave Airlie9eb1e572015-06-22 14:40:44 +10001224
1225 mutex_lock(&mgr->lock);
Dave Airliead7f8a12014-06-05 14:01:32 +10001226 mstb = mgr->mst_primary;
1227
1228 for (i = 0; i < lct - 1; i++) {
1229 int shift = (i % 2) ? 0 : 4;
Mykola Lysenko7a11a332015-12-25 16:14:48 +08001230 int port_num = (rad[i / 2] >> shift) & 0xf;
Dave Airliead7f8a12014-06-05 14:01:32 +10001231
1232 list_for_each_entry(port, &mstb->ports, next) {
1233 if (port->port_num == port_num) {
Adam Richter30730c72015-10-16 03:33:02 -07001234 mstb = port->mstb;
1235 if (!mstb) {
Dave Airliead7f8a12014-06-05 14:01:32 +10001236 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
Adam Richter30730c72015-10-16 03:33:02 -07001237 goto out;
Dave Airliead7f8a12014-06-05 14:01:32 +10001238 }
1239
Dave Airliead7f8a12014-06-05 14:01:32 +10001240 break;
1241 }
1242 }
1243 }
1244 kref_get(&mstb->kref);
Adam Richter30730c72015-10-16 03:33:02 -07001245out:
Dave Airlie9eb1e572015-06-22 14:40:44 +10001246 mutex_unlock(&mgr->lock);
Dave Airliead7f8a12014-06-05 14:01:32 +10001247 return mstb;
1248}
1249
Mykola Lysenkobd934322015-12-18 17:14:42 -05001250static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1251 struct drm_dp_mst_branch *mstb,
1252 uint8_t *guid)
1253{
1254 struct drm_dp_mst_branch *found_mstb;
1255 struct drm_dp_mst_port *port;
1256
Hersen Wu5e93b822016-01-22 17:07:28 -05001257 if (memcmp(mstb->guid, guid, 16) == 0)
1258 return mstb;
1259
1260
Mykola Lysenkobd934322015-12-18 17:14:42 -05001261 list_for_each_entry(port, &mstb->ports, next) {
1262 if (!port->mstb)
1263 continue;
1264
Mykola Lysenkobd934322015-12-18 17:14:42 -05001265 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1266
1267 if (found_mstb)
1268 return found_mstb;
1269 }
1270
1271 return NULL;
1272}
1273
1274static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1275 struct drm_dp_mst_topology_mgr *mgr,
1276 uint8_t *guid)
1277{
1278 struct drm_dp_mst_branch *mstb;
1279
1280 /* find the port by iterating down */
1281 mutex_lock(&mgr->lock);
1282
Hersen Wu5e93b822016-01-22 17:07:28 -05001283 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
Mykola Lysenkobd934322015-12-18 17:14:42 -05001284
1285 if (mstb)
1286 kref_get(&mstb->kref);
1287
1288 mutex_unlock(&mgr->lock);
1289 return mstb;
1290}
1291
Dave Airliead7f8a12014-06-05 14:01:32 +10001292static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1293 struct drm_dp_mst_branch *mstb)
1294{
1295 struct drm_dp_mst_port *port;
Daniel Vetter9254ec42015-06-22 17:31:59 +10001296 struct drm_dp_mst_branch *mstb_child;
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001297 if (!mstb->link_address_sent)
Dave Airliead7f8a12014-06-05 14:01:32 +10001298 drm_dp_send_link_address(mgr, mstb);
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001299
Dave Airliead7f8a12014-06-05 14:01:32 +10001300 list_for_each_entry(port, &mstb->ports, next) {
1301 if (port->input)
1302 continue;
1303
Dave Airlie8ae22cb2016-02-17 11:36:38 +10001304 if (!port->ddps)
Dave Airliead7f8a12014-06-05 14:01:32 +10001305 continue;
1306
1307 if (!port->available_pbn)
1308 drm_dp_send_enum_path_resources(mgr, mstb, port);
1309
Daniel Vetter9254ec42015-06-22 17:31:59 +10001310 if (port->mstb) {
1311 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1312 if (mstb_child) {
1313 drm_dp_check_and_send_link_address(mgr, mstb_child);
1314 drm_dp_put_mst_branch_device(mstb_child);
1315 }
1316 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001317 }
1318}
1319
1320static void drm_dp_mst_link_probe_work(struct work_struct *work)
1321{
1322 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
Daniel Vetter9254ec42015-06-22 17:31:59 +10001323 struct drm_dp_mst_branch *mstb;
Dave Airliead7f8a12014-06-05 14:01:32 +10001324
Daniel Vetter9254ec42015-06-22 17:31:59 +10001325 mutex_lock(&mgr->lock);
1326 mstb = mgr->mst_primary;
1327 if (mstb) {
1328 kref_get(&mstb->kref);
1329 }
1330 mutex_unlock(&mgr->lock);
1331 if (mstb) {
1332 drm_dp_check_and_send_link_address(mgr, mstb);
1333 drm_dp_put_mst_branch_device(mstb);
1334 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001335}
1336
1337static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1338 u8 *guid)
1339{
Ville Syrjäläe38e1282017-07-12 18:52:54 +03001340 u64 salt;
Dave Airliead7f8a12014-06-05 14:01:32 +10001341
Ville Syrjäläe38e1282017-07-12 18:52:54 +03001342 if (memchr_inv(guid, 0, 16))
1343 return true;
1344
1345 salt = get_jiffies_64();
1346
1347 memcpy(&guid[0], &salt, sizeof(u64));
1348 memcpy(&guid[8], &salt, sizeof(u64));
1349
1350 return false;
Dave Airliead7f8a12014-06-05 14:01:32 +10001351}
1352
1353#if 0
1354static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1355{
1356 struct drm_dp_sideband_msg_req_body req;
1357
1358 req.req_type = DP_REMOTE_DPCD_READ;
1359 req.u.dpcd_read.port_number = port_num;
1360 req.u.dpcd_read.dpcd_address = offset;
1361 req.u.dpcd_read.num_bytes = num_bytes;
1362 drm_dp_encode_sideband_req(&req, msg);
1363
1364 return 0;
1365}
1366#endif
1367
1368static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1369 bool up, u8 *msg, int len)
1370{
1371 int ret;
1372 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1373 int tosend, total, offset;
1374 int retries = 0;
1375
1376retry:
1377 total = len;
1378 offset = 0;
1379 do {
1380 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1381
1382 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1383 &msg[offset],
1384 tosend);
1385 if (ret != tosend) {
1386 if (ret == -EIO && retries < 5) {
1387 retries++;
1388 goto retry;
1389 }
1390 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
Dave Airliead7f8a12014-06-05 14:01:32 +10001391
1392 return -EIO;
1393 }
1394 offset += tosend;
1395 total -= tosend;
1396 } while (total > 0);
1397 return 0;
1398}
1399
1400static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1401 struct drm_dp_sideband_msg_tx *txmsg)
1402{
1403 struct drm_dp_mst_branch *mstb = txmsg->dst;
Mykola Lysenkobd934322015-12-18 17:14:42 -05001404 u8 req_type;
Dave Airliead7f8a12014-06-05 14:01:32 +10001405
1406 /* both msg slots are full */
1407 if (txmsg->seqno == -1) {
1408 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1409 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1410 return -EAGAIN;
1411 }
1412 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1413 txmsg->seqno = mstb->last_seqno;
1414 mstb->last_seqno ^= 1;
1415 } else if (mstb->tx_slots[0] == NULL)
1416 txmsg->seqno = 0;
1417 else
1418 txmsg->seqno = 1;
1419 mstb->tx_slots[txmsg->seqno] = txmsg;
1420 }
Mykola Lysenkobd934322015-12-18 17:14:42 -05001421
1422 req_type = txmsg->msg[0] & 0x7f;
1423 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1424 req_type == DP_RESOURCE_STATUS_NOTIFY)
1425 hdr->broadcast = 1;
1426 else
1427 hdr->broadcast = 0;
Dave Airliead7f8a12014-06-05 14:01:32 +10001428 hdr->path_msg = txmsg->path_msg;
1429 hdr->lct = mstb->lct;
1430 hdr->lcr = mstb->lct - 1;
1431 if (mstb->lct > 1)
1432 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1433 hdr->seqno = txmsg->seqno;
1434 return 0;
1435}
1436/*
1437 * process a single block of the next message in the sideband queue
1438 */
1439static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1440 struct drm_dp_sideband_msg_tx *txmsg,
1441 bool up)
1442{
1443 u8 chunk[48];
1444 struct drm_dp_sideband_msg_hdr hdr;
1445 int len, space, idx, tosend;
1446 int ret;
1447
Damien Lespiaubf3719c2014-07-14 12:13:18 +01001448 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1449
Dave Airliead7f8a12014-06-05 14:01:32 +10001450 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1451 txmsg->seqno = -1;
1452 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1453 }
1454
1455 /* make hdr from dst mst - for replies use seqno
1456 otherwise assign one */
1457 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1458 if (ret < 0)
1459 return ret;
1460
1461 /* amount left to send in this message */
1462 len = txmsg->cur_len - txmsg->cur_offset;
1463
1464 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1465 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1466
1467 tosend = min(len, space);
1468 if (len == txmsg->cur_len)
1469 hdr.somt = 1;
1470 if (space >= len)
1471 hdr.eomt = 1;
1472
1473
1474 hdr.msg_len = tosend + 1;
1475 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1476 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1477 /* add crc at end */
1478 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1479 idx += tosend + 1;
1480
1481 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1482 if (ret) {
1483 DRM_DEBUG_KMS("sideband msg failed to send\n");
1484 return ret;
1485 }
1486
1487 txmsg->cur_offset += tosend;
1488 if (txmsg->cur_offset == txmsg->cur_len) {
1489 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1490 return 1;
1491 }
1492 return 0;
1493}
1494
Dave Airliead7f8a12014-06-05 14:01:32 +10001495static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1496{
1497 struct drm_dp_sideband_msg_tx *txmsg;
1498 int ret;
1499
Daniel Vettercd961bb2015-01-28 10:02:23 +01001500 WARN_ON(!mutex_is_locked(&mgr->qlock));
1501
Dave Airliead7f8a12014-06-05 14:01:32 +10001502 /* construct a chunk from the first msg in the tx_msg queue */
Daniel Vettercb021a32016-07-15 21:48:03 +02001503 if (list_empty(&mgr->tx_msg_downq))
Dave Airliead7f8a12014-06-05 14:01:32 +10001504 return;
Dave Airliead7f8a12014-06-05 14:01:32 +10001505
1506 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1507 ret = process_single_tx_qlock(mgr, txmsg, false);
1508 if (ret == 1) {
1509 /* txmsg is sent it should be in the slots now */
1510 list_del(&txmsg->next);
1511 } else if (ret) {
1512 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1513 list_del(&txmsg->next);
1514 if (txmsg->seqno != -1)
1515 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1516 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
Chris Wilson68e989d2017-05-13 11:52:01 +01001517 wake_up_all(&mgr->tx_waitq);
Dave Airliead7f8a12014-06-05 14:01:32 +10001518 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001519}
1520
1521/* called holding qlock */
Mykola Lysenko1f16ee7f2015-12-18 17:14:43 -05001522static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1523 struct drm_dp_sideband_msg_tx *txmsg)
Dave Airliead7f8a12014-06-05 14:01:32 +10001524{
Dave Airliead7f8a12014-06-05 14:01:32 +10001525 int ret;
1526
1527 /* construct a chunk from the first msg in the tx_msg queue */
Dave Airliead7f8a12014-06-05 14:01:32 +10001528 ret = process_single_tx_qlock(mgr, txmsg, true);
Mykola Lysenko1f16ee7f2015-12-18 17:14:43 -05001529
1530 if (ret != 1)
Dave Airliead7f8a12014-06-05 14:01:32 +10001531 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
Mykola Lysenko1f16ee7f2015-12-18 17:14:43 -05001532
1533 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
Dave Airliead7f8a12014-06-05 14:01:32 +10001534}
1535
1536static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1537 struct drm_dp_sideband_msg_tx *txmsg)
1538{
1539 mutex_lock(&mgr->qlock);
1540 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
Daniel Vettercb021a32016-07-15 21:48:03 +02001541 if (list_is_singular(&mgr->tx_msg_downq))
Dave Airliead7f8a12014-06-05 14:01:32 +10001542 process_single_down_tx_qlock(mgr);
1543 mutex_unlock(&mgr->qlock);
1544}
1545
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001546static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1547 struct drm_dp_mst_branch *mstb)
Dave Airliead7f8a12014-06-05 14:01:32 +10001548{
1549 int len;
1550 struct drm_dp_sideband_msg_tx *txmsg;
1551 int ret;
1552
1553 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1554 if (!txmsg)
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001555 return;
Dave Airliead7f8a12014-06-05 14:01:32 +10001556
1557 txmsg->dst = mstb;
1558 len = build_link_address(txmsg);
1559
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001560 mstb->link_address_sent = true;
Dave Airliead7f8a12014-06-05 14:01:32 +10001561 drm_dp_queue_down_tx(mgr, txmsg);
1562
1563 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1564 if (ret > 0) {
1565 int i;
1566
1567 if (txmsg->reply.reply_type == 1)
1568 DRM_DEBUG_KMS("link address nak received\n");
1569 else {
1570 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1571 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1572 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,
1573 txmsg->reply.u.link_addr.ports[i].input_port,
1574 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1575 txmsg->reply.u.link_addr.ports[i].port_number,
1576 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1577 txmsg->reply.u.link_addr.ports[i].mcs,
1578 txmsg->reply.u.link_addr.ports[i].ddps,
1579 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1580 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1581 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1582 }
Hersen Wu5e93b822016-01-22 17:07:28 -05001583
1584 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1585
Dave Airliead7f8a12014-06-05 14:01:32 +10001586 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1587 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1588 }
Dave Airlie8ae22cb2016-02-17 11:36:38 +10001589 (*mgr->cbs->hotplug)(mgr);
Dave Airliead7f8a12014-06-05 14:01:32 +10001590 }
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001591 } else {
1592 mstb->link_address_sent = false;
Dave Airliead7f8a12014-06-05 14:01:32 +10001593 DRM_DEBUG_KMS("link address failed %d\n", ret);
Dave Airlie68d8c9f2015-09-06 18:53:00 +10001594 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001595
1596 kfree(txmsg);
Dave Airliead7f8a12014-06-05 14:01:32 +10001597}
1598
1599static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1600 struct drm_dp_mst_branch *mstb,
1601 struct drm_dp_mst_port *port)
1602{
1603 int len;
1604 struct drm_dp_sideband_msg_tx *txmsg;
1605 int ret;
1606
1607 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1608 if (!txmsg)
1609 return -ENOMEM;
1610
1611 txmsg->dst = mstb;
1612 len = build_enum_path_resources(txmsg, port->port_num);
1613
1614 drm_dp_queue_down_tx(mgr, txmsg);
1615
1616 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1617 if (ret > 0) {
1618 if (txmsg->reply.reply_type == 1)
1619 DRM_DEBUG_KMS("enum path resources nak received\n");
1620 else {
1621 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1622 DRM_ERROR("got incorrect port in response\n");
1623 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,
1624 txmsg->reply.u.path_resources.avail_payload_bw_number);
1625 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1626 }
1627 }
1628
1629 kfree(txmsg);
1630 return 0;
1631}
1632
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001633static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1634{
1635 if (!mstb->port_parent)
1636 return NULL;
1637
1638 if (mstb->port_parent->mstb != mstb)
1639 return mstb->port_parent;
1640
1641 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1642}
1643
1644static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1645 struct drm_dp_mst_branch *mstb,
1646 int *port_num)
1647{
1648 struct drm_dp_mst_branch *rmstb = NULL;
1649 struct drm_dp_mst_port *found_port;
1650 mutex_lock(&mgr->lock);
1651 if (mgr->mst_primary) {
1652 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1653
1654 if (found_port) {
1655 rmstb = found_port->parent;
1656 kref_get(&rmstb->kref);
1657 *port_num = found_port->port_num;
1658 }
1659 }
1660 mutex_unlock(&mgr->lock);
1661 return rmstb;
1662}
1663
Thierry Reding8fa6a422014-07-21 13:23:57 +02001664static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1665 struct drm_dp_mst_port *port,
1666 int id,
1667 int pbn)
Dave Airliead7f8a12014-06-05 14:01:32 +10001668{
1669 struct drm_dp_sideband_msg_tx *txmsg;
1670 struct drm_dp_mst_branch *mstb;
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001671 int len, ret, port_num;
Libin Yangef8f9be2015-12-02 14:09:43 +08001672 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1673 int i;
Dave Airliead7f8a12014-06-05 14:01:32 +10001674
cpaul@redhat.comdeba0a22016-04-04 19:58:47 -04001675 port = drm_dp_get_validated_port_ref(mgr, port);
1676 if (!port)
1677 return -EINVAL;
1678
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001679 port_num = port->port_num;
Dave Airliead7f8a12014-06-05 14:01:32 +10001680 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001681 if (!mstb) {
1682 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1683
cpaul@redhat.comdeba0a22016-04-04 19:58:47 -04001684 if (!mstb) {
1685 drm_dp_put_port(port);
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001686 return -EINVAL;
cpaul@redhat.comdeba0a22016-04-04 19:58:47 -04001687 }
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001688 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001689
1690 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1691 if (!txmsg) {
1692 ret = -ENOMEM;
1693 goto fail_put;
1694 }
1695
Libin Yangef8f9be2015-12-02 14:09:43 +08001696 for (i = 0; i < port->num_sdp_streams; i++)
1697 sinks[i] = i;
1698
Dave Airliead7f8a12014-06-05 14:01:32 +10001699 txmsg->dst = mstb;
Mykola Lysenko91a25e42016-01-27 09:39:36 -05001700 len = build_allocate_payload(txmsg, port_num,
Dave Airliead7f8a12014-06-05 14:01:32 +10001701 id,
Libin Yangef8f9be2015-12-02 14:09:43 +08001702 pbn, port->num_sdp_streams, sinks);
Dave Airliead7f8a12014-06-05 14:01:32 +10001703
1704 drm_dp_queue_down_tx(mgr, txmsg);
1705
1706 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1707 if (ret > 0) {
1708 if (txmsg->reply.reply_type == 1) {
1709 ret = -EINVAL;
1710 } else
1711 ret = 0;
1712 }
1713 kfree(txmsg);
1714fail_put:
1715 drm_dp_put_mst_branch_device(mstb);
cpaul@redhat.comdeba0a22016-04-04 19:58:47 -04001716 drm_dp_put_port(port);
Dave Airliead7f8a12014-06-05 14:01:32 +10001717 return ret;
1718}
1719
1720static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1721 int id,
1722 struct drm_dp_payload *payload)
1723{
1724 int ret;
1725
1726 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1727 if (ret < 0) {
1728 payload->payload_state = 0;
1729 return ret;
1730 }
1731 payload->payload_state = DP_PAYLOAD_LOCAL;
1732 return 0;
1733}
1734
Thierry Reding8fa6a422014-07-21 13:23:57 +02001735static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1736 struct drm_dp_mst_port *port,
1737 int id,
1738 struct drm_dp_payload *payload)
Dave Airliead7f8a12014-06-05 14:01:32 +10001739{
1740 int ret;
1741 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1742 if (ret < 0)
1743 return ret;
1744 payload->payload_state = DP_PAYLOAD_REMOTE;
1745 return ret;
1746}
1747
Thierry Reding8fa6a422014-07-21 13:23:57 +02001748static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1749 struct drm_dp_mst_port *port,
1750 int id,
1751 struct drm_dp_payload *payload)
Dave Airliead7f8a12014-06-05 14:01:32 +10001752{
1753 DRM_DEBUG_KMS("\n");
1754 /* its okay for these to fail */
1755 if (port) {
1756 drm_dp_payload_send_msg(mgr, port, id, 0);
1757 }
1758
1759 drm_dp_dpcd_write_payload(mgr, id, payload);
Dave Airliedfda0df2014-08-06 16:26:21 +10001760 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
Dave Airliead7f8a12014-06-05 14:01:32 +10001761 return 0;
1762}
1763
Thierry Reding8fa6a422014-07-21 13:23:57 +02001764static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1765 int id,
1766 struct drm_dp_payload *payload)
Dave Airliead7f8a12014-06-05 14:01:32 +10001767{
1768 payload->payload_state = 0;
1769 return 0;
1770}
1771
1772/**
1773 * drm_dp_update_payload_part1() - Execute payload update part 1
1774 * @mgr: manager to use.
1775 *
1776 * This iterates over all proposed virtual channels, and tries to
1777 * allocate space in the link for them. For 0->slots transitions,
1778 * this step just writes the VCPI to the MST device. For slots->0
1779 * transitions, this writes the updated VCPIs and removes the
1780 * remote VC payloads.
1781 *
1782 * after calling this the driver should generate ACT and payload
1783 * packets.
1784 */
1785int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1786{
Dave Airliedfda0df2014-08-06 16:26:21 +10001787 int i, j;
Dave Airliead7f8a12014-06-05 14:01:32 +10001788 int cur_slots = 1;
1789 struct drm_dp_payload req_payload;
1790 struct drm_dp_mst_port *port;
1791
1792 mutex_lock(&mgr->payload_lock);
1793 for (i = 0; i < mgr->max_payloads; i++) {
1794 /* solve the current payloads - compare to the hw ones
1795 - update the hw view */
1796 req_payload.start_slot = cur_slots;
1797 if (mgr->proposed_vcpis[i]) {
1798 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
cpaul@redhat.com263efde2016-04-22 16:08:46 -04001799 port = drm_dp_get_validated_port_ref(mgr, port);
1800 if (!port) {
1801 mutex_unlock(&mgr->payload_lock);
1802 return -EINVAL;
1803 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001804 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
Harry Wentland6cecdf7a2015-12-07 13:55:52 -05001805 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
Dave Airliead7f8a12014-06-05 14:01:32 +10001806 } else {
1807 port = NULL;
1808 req_payload.num_slots = 0;
1809 }
Dave Airliedfda0df2014-08-06 16:26:21 +10001810
1811 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1812 mgr->payloads[i].start_slot = req_payload.start_slot;
1813 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001814 /* work out what is required to happen with this payload */
Dave Airliedfda0df2014-08-06 16:26:21 +10001815 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
Dave Airliead7f8a12014-06-05 14:01:32 +10001816
1817 /* need to push an update for this payload */
1818 if (req_payload.num_slots) {
Dave Airliedfda0df2014-08-06 16:26:21 +10001819 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
Dave Airliead7f8a12014-06-05 14:01:32 +10001820 mgr->payloads[i].num_slots = req_payload.num_slots;
Harry Wentland6cecdf7a2015-12-07 13:55:52 -05001821 mgr->payloads[i].vcpi = req_payload.vcpi;
Dave Airliead7f8a12014-06-05 14:01:32 +10001822 } else if (mgr->payloads[i].num_slots) {
1823 mgr->payloads[i].num_slots = 0;
Pierre-Louis Bossartbb08c042017-02-14 14:49:21 +02001824 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
Dave Airliead7f8a12014-06-05 14:01:32 +10001825 req_payload.payload_state = mgr->payloads[i].payload_state;
Dave Airliedfda0df2014-08-06 16:26:21 +10001826 mgr->payloads[i].start_slot = 0;
1827 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001828 mgr->payloads[i].payload_state = req_payload.payload_state;
1829 }
1830 cur_slots += req_payload.num_slots;
cpaul@redhat.com263efde2016-04-22 16:08:46 -04001831
1832 if (port)
1833 drm_dp_put_port(port);
Dave Airliead7f8a12014-06-05 14:01:32 +10001834 }
Dave Airliedfda0df2014-08-06 16:26:21 +10001835
1836 for (i = 0; i < mgr->max_payloads; i++) {
1837 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1838 DRM_DEBUG_KMS("removing payload %d\n", i);
1839 for (j = i; j < mgr->max_payloads - 1; j++) {
1840 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1841 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1842 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1843 set_bit(j + 1, &mgr->payload_mask);
1844 } else {
1845 clear_bit(j + 1, &mgr->payload_mask);
1846 }
1847 }
1848 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1849 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1850 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1851
1852 }
1853 }
Dave Airliead7f8a12014-06-05 14:01:32 +10001854 mutex_unlock(&mgr->payload_lock);
1855
1856 return 0;
1857}
1858EXPORT_SYMBOL(drm_dp_update_payload_part1);
1859
1860/**
1861 * drm_dp_update_payload_part2() - Execute payload update part 2
1862 * @mgr: manager to use.
1863 *
1864 * This iterates over all proposed virtual channels, and tries to
1865 * allocate space in the link for them. For 0->slots transitions,
1866 * this step writes the remote VC payload commands. For slots->0
1867 * this just resets some internal state.
1868 */
1869int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1870{
1871 struct drm_dp_mst_port *port;
1872 int i;
Damien Lespiau7389ad42014-07-14 11:53:44 +01001873 int ret = 0;
Dave Airliead7f8a12014-06-05 14:01:32 +10001874 mutex_lock(&mgr->payload_lock);
1875 for (i = 0; i < mgr->max_payloads; i++) {
1876
1877 if (!mgr->proposed_vcpis[i])
1878 continue;
1879
1880 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1881
1882 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1883 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
Dave Airliedfda0df2014-08-06 16:26:21 +10001884 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
Dave Airliead7f8a12014-06-05 14:01:32 +10001885 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
Dave Airliedfda0df2014-08-06 16:26:21 +10001886 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
Dave Airliead7f8a12014-06-05 14:01:32 +10001887 }
1888 if (ret) {
1889 mutex_unlock(&mgr->payload_lock);
1890 return ret;
1891 }
1892 }
1893 mutex_unlock(&mgr->payload_lock);
1894 return 0;
1895}
1896EXPORT_SYMBOL(drm_dp_update_payload_part2);
1897
1898#if 0 /* unused as of yet */
1899static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1900 struct drm_dp_mst_port *port,
1901 int offset, int size)
1902{
1903 int len;
1904 struct drm_dp_sideband_msg_tx *txmsg;
1905
1906 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1907 if (!txmsg)
1908 return -ENOMEM;
1909
1910 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1911 txmsg->dst = port->parent;
1912
1913 drm_dp_queue_down_tx(mgr, txmsg);
1914
1915 return 0;
1916}
1917#endif
1918
1919static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1920 struct drm_dp_mst_port *port,
1921 int offset, int size, u8 *bytes)
1922{
1923 int len;
1924 int ret;
1925 struct drm_dp_sideband_msg_tx *txmsg;
1926 struct drm_dp_mst_branch *mstb;
1927
1928 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1929 if (!mstb)
1930 return -EINVAL;
1931
1932 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1933 if (!txmsg) {
1934 ret = -ENOMEM;
1935 goto fail_put;
1936 }
1937
1938 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1939 txmsg->dst = mstb;
1940
1941 drm_dp_queue_down_tx(mgr, txmsg);
1942
1943 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1944 if (ret > 0) {
1945 if (txmsg->reply.reply_type == 1) {
1946 ret = -EINVAL;
1947 } else
1948 ret = 0;
1949 }
1950 kfree(txmsg);
1951fail_put:
1952 drm_dp_put_mst_branch_device(mstb);
1953 return ret;
1954}
1955
1956static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1957{
1958 struct drm_dp_sideband_msg_reply_body reply;
1959
Mykola Lysenkoa68d2432015-12-07 13:55:51 -05001960 reply.reply_type = 0;
Dave Airliead7f8a12014-06-05 14:01:32 +10001961 reply.req_type = req_type;
1962 drm_dp_encode_sideband_reply(&reply, msg);
1963 return 0;
1964}
1965
1966static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1967 struct drm_dp_mst_branch *mstb,
1968 int req_type, int seqno, bool broadcast)
1969{
1970 struct drm_dp_sideband_msg_tx *txmsg;
1971
1972 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1973 if (!txmsg)
1974 return -ENOMEM;
1975
1976 txmsg->dst = mstb;
1977 txmsg->seqno = seqno;
1978 drm_dp_encode_up_ack_reply(txmsg, req_type);
1979
1980 mutex_lock(&mgr->qlock);
Mykola Lysenko1f16ee7f2015-12-18 17:14:43 -05001981
1982 process_single_up_tx_qlock(mgr, txmsg);
1983
Dave Airliead7f8a12014-06-05 14:01:32 +10001984 mutex_unlock(&mgr->qlock);
Mykola Lysenko1f16ee7f2015-12-18 17:14:43 -05001985
1986 kfree(txmsg);
Dave Airliead7f8a12014-06-05 14:01:32 +10001987 return 0;
1988}
1989
Chris Wilsonb853fdb2014-11-12 10:13:37 +00001990static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
1991 int dp_link_count,
1992 int *out)
Dave Airliead7f8a12014-06-05 14:01:32 +10001993{
1994 switch (dp_link_bw) {
Chris Wilsonb853fdb2014-11-12 10:13:37 +00001995 default:
1996 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
1997 dp_link_bw, dp_link_count);
1998 return false;
1999
Dave Airliead7f8a12014-06-05 14:01:32 +10002000 case DP_LINK_BW_1_62:
Chris Wilsonb853fdb2014-11-12 10:13:37 +00002001 *out = 3 * dp_link_count;
2002 break;
Dave Airliead7f8a12014-06-05 14:01:32 +10002003 case DP_LINK_BW_2_7:
Chris Wilsonb853fdb2014-11-12 10:13:37 +00002004 *out = 5 * dp_link_count;
2005 break;
Dave Airliead7f8a12014-06-05 14:01:32 +10002006 case DP_LINK_BW_5_4:
Chris Wilsonb853fdb2014-11-12 10:13:37 +00002007 *out = 10 * dp_link_count;
2008 break;
Dave Airliead7f8a12014-06-05 14:01:32 +10002009 }
Chris Wilsonb853fdb2014-11-12 10:13:37 +00002010 return true;
Dave Airliead7f8a12014-06-05 14:01:32 +10002011}
2012
2013/**
2014 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2015 * @mgr: manager to set state for
2016 * @mst_state: true to enable MST on this connector - false to disable.
2017 *
2018 * This is called by the driver when it detects an MST capable device plugged
2019 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2020 */
2021int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2022{
2023 int ret = 0;
2024 struct drm_dp_mst_branch *mstb = NULL;
2025
2026 mutex_lock(&mgr->lock);
2027 if (mst_state == mgr->mst_state)
2028 goto out_unlock;
2029
2030 mgr->mst_state = mst_state;
2031 /* set the device into MST mode */
2032 if (mst_state) {
2033 WARN_ON(mgr->mst_primary);
2034
2035 /* get dpcd info */
2036 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2037 if (ret != DP_RECEIVER_CAP_SIZE) {
2038 DRM_DEBUG_KMS("failed to read DPCD\n");
2039 goto out_unlock;
2040 }
2041
Chris Wilsonb853fdb2014-11-12 10:13:37 +00002042 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2043 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2044 &mgr->pbn_div)) {
2045 ret = -EINVAL;
2046 goto out_unlock;
2047 }
2048
Dave Airliead7f8a12014-06-05 14:01:32 +10002049 /* add initial branch device at LCT 1 */
2050 mstb = drm_dp_add_mst_branch_device(1, NULL);
2051 if (mstb == NULL) {
2052 ret = -ENOMEM;
2053 goto out_unlock;
2054 }
2055 mstb->mgr = mgr;
2056
2057 /* give this the main reference */
2058 mgr->mst_primary = mstb;
2059 kref_get(&mgr->mst_primary->kref);
2060
Andrey Grodzovskyc175cd12016-01-22 17:07:29 -05002061 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2062 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2063 if (ret < 0) {
2064 goto out_unlock;
2065 }
2066
Dave Airliead7f8a12014-06-05 14:01:32 +10002067 {
2068 struct drm_dp_payload reset_pay;
2069 reset_pay.start_slot = 0;
2070 reset_pay.num_slots = 0x3f;
2071 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2072 }
2073
Dave Airliead7f8a12014-06-05 14:01:32 +10002074 queue_work(system_long_wq, &mgr->work);
2075
2076 ret = 0;
2077 } else {
2078 /* disable MST on the device */
2079 mstb = mgr->mst_primary;
2080 mgr->mst_primary = NULL;
2081 /* this can fail if the device is gone */
2082 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2083 ret = 0;
2084 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2085 mgr->payload_mask = 0;
2086 set_bit(0, &mgr->payload_mask);
Dave Airliedfda0df2014-08-06 16:26:21 +10002087 mgr->vcpi_mask = 0;
Dave Airliead7f8a12014-06-05 14:01:32 +10002088 }
2089
2090out_unlock:
2091 mutex_unlock(&mgr->lock);
2092 if (mstb)
2093 drm_dp_put_mst_branch_device(mstb);
2094 return ret;
2095
2096}
2097EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2098
2099/**
2100 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2101 * @mgr: manager to suspend
2102 *
2103 * This function tells the MST device that we can't handle UP messages
2104 * anymore. This should stop it from sending any since we are suspended.
2105 */
2106void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2107{
2108 mutex_lock(&mgr->lock);
2109 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2110 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2111 mutex_unlock(&mgr->lock);
Dave Airlie274d8352015-09-30 10:39:42 +10002112 flush_work(&mgr->work);
2113 flush_work(&mgr->destroy_connector_work);
Dave Airliead7f8a12014-06-05 14:01:32 +10002114}
2115EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2116
2117/**
2118 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2119 * @mgr: manager to resume
2120 *
2121 * This will fetch DPCD and see if the device is still there,
2122 * if it is, it will rewrite the MSTM control bits, and return.
2123 *
2124 * if the device fails this returns -1, and the driver should do
2125 * a full MST reprobe, in case we were undocked.
2126 */
2127int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2128{
2129 int ret = 0;
2130
2131 mutex_lock(&mgr->lock);
2132
2133 if (mgr->mst_primary) {
2134 int sret;
Lyude1652fce2016-04-13 16:50:18 -04002135 u8 guid[16];
2136
Dave Airliead7f8a12014-06-05 14:01:32 +10002137 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2138 if (sret != DP_RECEIVER_CAP_SIZE) {
2139 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2140 ret = -1;
2141 goto out_unlock;
2142 }
2143
2144 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2145 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2146 if (ret < 0) {
2147 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2148 ret = -1;
2149 goto out_unlock;
2150 }
Lyude1652fce2016-04-13 16:50:18 -04002151
2152 /* Some hubs forget their guids after they resume */
2153 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2154 if (sret != 16) {
2155 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2156 ret = -1;
2157 goto out_unlock;
2158 }
2159 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2160
Dave Airliead7f8a12014-06-05 14:01:32 +10002161 ret = 0;
2162 } else
2163 ret = -1;
2164
2165out_unlock:
2166 mutex_unlock(&mgr->lock);
2167 return ret;
2168}
2169EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2170
2171static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2172{
2173 int len;
2174 u8 replyblock[32];
2175 int replylen, origlen, curreply;
2176 int ret;
2177 struct drm_dp_sideband_msg_rx *msg;
2178 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2179 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2180
2181 len = min(mgr->max_dpcd_transaction_bytes, 16);
2182 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2183 replyblock, len);
2184 if (ret != len) {
2185 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2186 return;
2187 }
2188 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2189 if (!ret) {
2190 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2191 return;
2192 }
2193 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2194
2195 origlen = replylen;
2196 replylen -= len;
2197 curreply = len;
2198 while (replylen > 0) {
2199 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2200 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2201 replyblock, len);
2202 if (ret != len) {
2203 DRM_DEBUG_KMS("failed to read a chunk\n");
2204 }
2205 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2206 if (ret == false)
2207 DRM_DEBUG_KMS("failed to build sideband msg\n");
2208 curreply += len;
2209 replylen -= len;
2210 }
2211}
2212
2213static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2214{
2215 int ret = 0;
2216
2217 drm_dp_get_one_sb_msg(mgr, false);
2218
2219 if (mgr->down_rep_recv.have_eomt) {
2220 struct drm_dp_sideband_msg_tx *txmsg;
2221 struct drm_dp_mst_branch *mstb;
2222 int slot = -1;
2223 mstb = drm_dp_get_mst_branch_device(mgr,
2224 mgr->down_rep_recv.initial_hdr.lct,
2225 mgr->down_rep_recv.initial_hdr.rad);
2226
2227 if (!mstb) {
2228 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2229 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2230 return 0;
2231 }
2232
2233 /* find the message */
2234 slot = mgr->down_rep_recv.initial_hdr.seqno;
2235 mutex_lock(&mgr->qlock);
2236 txmsg = mstb->tx_slots[slot];
2237 /* remove from slots */
2238 mutex_unlock(&mgr->qlock);
2239
2240 if (!txmsg) {
2241 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2242 mstb,
2243 mgr->down_rep_recv.initial_hdr.seqno,
2244 mgr->down_rep_recv.initial_hdr.lct,
2245 mgr->down_rep_recv.initial_hdr.rad[0],
2246 mgr->down_rep_recv.msg[0]);
2247 drm_dp_put_mst_branch_device(mstb);
2248 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2249 return 0;
2250 }
2251
2252 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2253 if (txmsg->reply.reply_type == 1) {
2254 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);
2255 }
2256
2257 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2258 drm_dp_put_mst_branch_device(mstb);
2259
2260 mutex_lock(&mgr->qlock);
2261 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2262 mstb->tx_slots[slot] = NULL;
2263 mutex_unlock(&mgr->qlock);
2264
Chris Wilson68e989d2017-05-13 11:52:01 +01002265 wake_up_all(&mgr->tx_waitq);
Dave Airliead7f8a12014-06-05 14:01:32 +10002266 }
2267 return ret;
2268}
2269
2270static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2271{
2272 int ret = 0;
2273 drm_dp_get_one_sb_msg(mgr, true);
2274
2275 if (mgr->up_req_recv.have_eomt) {
2276 struct drm_dp_sideband_msg_req_body msg;
Mykola Lysenkobd934322015-12-18 17:14:42 -05002277 struct drm_dp_mst_branch *mstb = NULL;
Dave Airliead7f8a12014-06-05 14:01:32 +10002278 bool seqno;
Mykola Lysenkobd934322015-12-18 17:14:42 -05002279
2280 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2281 mstb = drm_dp_get_mst_branch_device(mgr,
2282 mgr->up_req_recv.initial_hdr.lct,
2283 mgr->up_req_recv.initial_hdr.rad);
2284 if (!mstb) {
2285 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2286 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2287 return 0;
2288 }
Dave Airliead7f8a12014-06-05 14:01:32 +10002289 }
2290
2291 seqno = mgr->up_req_recv.initial_hdr.seqno;
2292 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2293
2294 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
Mykola Lysenkobd934322015-12-18 17:14:42 -05002295 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2296
2297 if (!mstb)
2298 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2299
2300 if (!mstb) {
2301 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2302 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2303 return 0;
2304 }
2305
Dave Airliead7f8a12014-06-05 14:01:32 +10002306 drm_dp_update_port(mstb, &msg.u.conn_stat);
Hersen Wu5e93b822016-01-22 17:07:28 -05002307
Dave Airliead7f8a12014-06-05 14:01:32 +10002308 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);
Dave Airlie8ae22cb2016-02-17 11:36:38 +10002309 (*mgr->cbs->hotplug)(mgr);
2310
Dave Airliead7f8a12014-06-05 14:01:32 +10002311 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
Mykola Lysenkobd934322015-12-18 17:14:42 -05002312 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2313 if (!mstb)
2314 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2315
2316 if (!mstb) {
2317 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2318 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2319 return 0;
2320 }
2321
Dave Airliead7f8a12014-06-05 14:01:32 +10002322 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2323 }
2324
2325 drm_dp_put_mst_branch_device(mstb);
2326 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2327 }
2328 return ret;
2329}
2330
2331/**
2332 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2333 * @mgr: manager to notify irq for.
2334 * @esi: 4 bytes from SINK_COUNT_ESI
Daniel Vetter295ee852014-07-30 14:23:44 +02002335 * @handled: whether the hpd interrupt was consumed or not
Dave Airliead7f8a12014-06-05 14:01:32 +10002336 *
2337 * This should be called from the driver when it detects a short IRQ,
2338 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2339 * topology manager will process the sideband messages received as a result
2340 * of this.
2341 */
2342int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2343{
2344 int ret = 0;
2345 int sc;
2346 *handled = false;
2347 sc = esi[0] & 0x3f;
2348
2349 if (sc != mgr->sink_count) {
2350 mgr->sink_count = sc;
2351 *handled = true;
2352 }
2353
2354 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2355 ret = drm_dp_mst_handle_down_rep(mgr);
2356 *handled = true;
2357 }
2358
2359 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2360 ret |= drm_dp_mst_handle_up_req(mgr);
2361 *handled = true;
2362 }
2363
2364 drm_dp_mst_kick_tx(mgr);
2365 return ret;
2366}
2367EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2368
2369/**
2370 * drm_dp_mst_detect_port() - get connection status for an MST port
Daniel Vetter132d49d2016-07-15 21:48:04 +02002371 * @connector: DRM connector for this port
Dave Airliead7f8a12014-06-05 14:01:32 +10002372 * @mgr: manager for this port
2373 * @port: unverified pointer to a port
2374 *
2375 * This returns the current connection state for a port. It validates the
2376 * port pointer still exists so the caller doesn't require a reference
2377 */
Dave Airliec6a0aed2014-10-20 16:28:02 +10002378enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2379 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
Dave Airliead7f8a12014-06-05 14:01:32 +10002380{
2381 enum drm_connector_status status = connector_status_disconnected;
2382
2383 /* we need to search for the port in the mgr in case its gone */
2384 port = drm_dp_get_validated_port_ref(mgr, port);
2385 if (!port)
2386 return connector_status_disconnected;
2387
2388 if (!port->ddps)
2389 goto out;
2390
2391 switch (port->pdt) {
2392 case DP_PEER_DEVICE_NONE:
2393 case DP_PEER_DEVICE_MST_BRANCHING:
2394 break;
2395
2396 case DP_PEER_DEVICE_SST_SINK:
2397 status = connector_status_connected;
Dave Airlie8ae22cb2016-02-17 11:36:38 +10002398 /* for logical ports - cache the EDID */
2399 if (port->port_num >= 8 && !port->cached_edid) {
2400 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2401 }
Dave Airliead7f8a12014-06-05 14:01:32 +10002402 break;
2403 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2404 if (port->ldps)
2405 status = connector_status_connected;
2406 break;
2407 }
2408out:
2409 drm_dp_put_port(port);
2410 return status;
2411}
2412EXPORT_SYMBOL(drm_dp_mst_detect_port);
2413
2414/**
Libin Yangef8f9be2015-12-02 14:09:43 +08002415 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2416 * @mgr: manager for this port
2417 * @port: unverified pointer to a port.
2418 *
2419 * This returns whether the port supports audio or not.
2420 */
2421bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2422 struct drm_dp_mst_port *port)
2423{
2424 bool ret = false;
2425
2426 port = drm_dp_get_validated_port_ref(mgr, port);
2427 if (!port)
2428 return ret;
2429 ret = port->has_audio;
2430 drm_dp_put_port(port);
2431 return ret;
2432}
2433EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2434
2435/**
Dave Airliead7f8a12014-06-05 14:01:32 +10002436 * drm_dp_mst_get_edid() - get EDID for an MST port
2437 * @connector: toplevel connector to get EDID for
2438 * @mgr: manager for this port
2439 * @port: unverified pointer to a port.
2440 *
2441 * This returns an EDID for the port connected to a connector,
2442 * It validates the pointer still exists so the caller doesn't require a
2443 * reference.
2444 */
2445struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2446{
2447 struct edid *edid = NULL;
2448
2449 /* we need to search for the port in the mgr in case its gone */
2450 port = drm_dp_get_validated_port_ref(mgr, port);
2451 if (!port)
2452 return NULL;
2453
Dave Airliec6a0aed2014-10-20 16:28:02 +10002454 if (port->cached_edid)
2455 edid = drm_edid_duplicate(port->cached_edid);
Dave Airlie8ae22cb2016-02-17 11:36:38 +10002456 else {
2457 edid = drm_get_edid(connector, &port->aux.ddc);
2458 drm_mode_connector_set_tile_property(connector);
2459 }
Libin Yangef8f9be2015-12-02 14:09:43 +08002460 port->has_audio = drm_detect_monitor_audio(edid);
Dave Airliead7f8a12014-06-05 14:01:32 +10002461 drm_dp_put_port(port);
2462 return edid;
2463}
2464EXPORT_SYMBOL(drm_dp_mst_get_edid);
2465
2466/**
2467 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2468 * @mgr: manager to use
2469 * @pbn: payload bandwidth to convert into slots.
2470 */
2471int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2472 int pbn)
2473{
2474 int num_slots;
2475
2476 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2477
Pandiyan, Dhinakaranfeb2c3b2017-03-16 00:10:25 -07002478 /* max. time slots - one slot for MTP header */
2479 if (num_slots > 63)
Dave Airliead7f8a12014-06-05 14:01:32 +10002480 return -ENOSPC;
2481 return num_slots;
2482}
2483EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2484
2485static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
Pandiyan, Dhinakaran1e797f52017-03-16 00:10:26 -07002486 struct drm_dp_vcpi *vcpi, int pbn, int slots)
Dave Airliead7f8a12014-06-05 14:01:32 +10002487{
Dave Airliead7f8a12014-06-05 14:01:32 +10002488 int ret;
2489
Pandiyan, Dhinakaranfeb2c3b2017-03-16 00:10:25 -07002490 /* max. time slots - one slot for MTP header */
Pandiyan, Dhinakaran1e797f52017-03-16 00:10:26 -07002491 if (slots > 63)
Dave Airliead7f8a12014-06-05 14:01:32 +10002492 return -ENOSPC;
2493
2494 vcpi->pbn = pbn;
Pandiyan, Dhinakaran1e797f52017-03-16 00:10:26 -07002495 vcpi->aligned_pbn = slots * mgr->pbn_div;
2496 vcpi->num_slots = slots;
Dave Airliead7f8a12014-06-05 14:01:32 +10002497
2498 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2499 if (ret < 0)
2500 return ret;
2501 return 0;
2502}
2503
2504/**
Pandiyan, Dhinakaranedb1ed12017-04-20 22:51:32 -07002505 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
2506 * @state: global atomic state
2507 * @mgr: MST topology manager for the port
2508 * @port: port to find vcpi slots for
2509 * @pbn: bandwidth required for the mode in PBN
2510 *
2511 * RETURNS:
2512 * Total slots in the atomic state assigned for this port or error
2513 */
2514int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
2515 struct drm_dp_mst_topology_mgr *mgr,
2516 struct drm_dp_mst_port *port, int pbn)
2517{
2518 struct drm_dp_mst_topology_state *topology_state;
2519 int req_slots;
2520
2521 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
Ville Syrjälä56a91c42017-07-12 18:51:00 +03002522 if (IS_ERR(topology_state))
2523 return PTR_ERR(topology_state);
Pandiyan, Dhinakaranedb1ed12017-04-20 22:51:32 -07002524
2525 port = drm_dp_get_validated_port_ref(mgr, port);
2526 if (port == NULL)
2527 return -EINVAL;
2528 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2529 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
2530 req_slots, topology_state->avail_slots);
2531
2532 if (req_slots > topology_state->avail_slots) {
2533 drm_dp_put_port(port);
2534 return -ENOSPC;
2535 }
2536
2537 topology_state->avail_slots -= req_slots;
2538 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
2539
2540 drm_dp_put_port(port);
2541 return req_slots;
2542}
2543EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
2544
2545/**
2546 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
2547 * @state: global atomic state
2548 * @mgr: MST topology manager for the port
2549 * @slots: number of vcpi slots to release
2550 *
2551 * RETURNS:
2552 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
2553 * negative error code
2554 */
2555int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
2556 struct drm_dp_mst_topology_mgr *mgr,
2557 int slots)
2558{
2559 struct drm_dp_mst_topology_state *topology_state;
2560
2561 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
Ville Syrjälä56a91c42017-07-12 18:51:00 +03002562 if (IS_ERR(topology_state))
2563 return PTR_ERR(topology_state);
Pandiyan, Dhinakaranedb1ed12017-04-20 22:51:32 -07002564
2565 /* We cannot rely on port->vcpi.num_slots to update
2566 * topology_state->avail_slots as the port may not exist if the parent
2567 * branch device was unplugged. This should be fixed by tracking
2568 * per-port slot allocation in drm_dp_mst_topology_state instead of
2569 * depending on the caller to tell us how many slots to release.
2570 */
2571 topology_state->avail_slots += slots;
2572 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
2573 slots, topology_state->avail_slots);
2574
2575 return 0;
2576}
2577EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
2578
2579/**
Dave Airliead7f8a12014-06-05 14:01:32 +10002580 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2581 * @mgr: manager for this port
2582 * @port: port to allocate a virtual channel for.
2583 * @pbn: payload bandwidth number to request
2584 * @slots: returned number of slots for this PBN.
2585 */
Pandiyan, Dhinakaran1e797f52017-03-16 00:10:26 -07002586bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2587 struct drm_dp_mst_port *port, int pbn, int slots)
Dave Airliead7f8a12014-06-05 14:01:32 +10002588{
2589 int ret;
2590
2591 port = drm_dp_get_validated_port_ref(mgr, port);
2592 if (!port)
2593 return false;
2594
Pandiyan, Dhinakaran1e797f52017-03-16 00:10:26 -07002595 if (slots < 0)
2596 return false;
2597
Dave Airliead7f8a12014-06-05 14:01:32 +10002598 if (port->vcpi.vcpi > 0) {
2599 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2600 if (pbn == port->vcpi.pbn) {
Insu Yundabe1952016-02-01 11:08:29 -05002601 drm_dp_put_port(port);
Dave Airliead7f8a12014-06-05 14:01:32 +10002602 return true;
2603 }
2604 }
2605
Pandiyan, Dhinakaran1e797f52017-03-16 00:10:26 -07002606 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
Dave Airliead7f8a12014-06-05 14:01:32 +10002607 if (ret) {
Pandiyan, Dhinakaranfeb2c3b2017-03-16 00:10:25 -07002608 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2609 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
Dave Airliead7f8a12014-06-05 14:01:32 +10002610 goto out;
2611 }
Pandiyan, Dhinakaranfeb2c3b2017-03-16 00:10:25 -07002612 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2613 pbn, port->vcpi.num_slots);
Dave Airliead7f8a12014-06-05 14:01:32 +10002614
2615 drm_dp_put_port(port);
2616 return true;
2617out:
2618 return false;
2619}
2620EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2621
Dave Airlie87f59422015-02-24 09:23:55 +10002622int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2623{
2624 int slots = 0;
2625 port = drm_dp_get_validated_port_ref(mgr, port);
2626 if (!port)
2627 return slots;
2628
2629 slots = port->vcpi.num_slots;
2630 drm_dp_put_port(port);
2631 return slots;
2632}
2633EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2634
Dave Airliead7f8a12014-06-05 14:01:32 +10002635/**
2636 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2637 * @mgr: manager for this port
2638 * @port: unverified pointer to a port.
2639 *
2640 * This just resets the number of slots for the ports VCPI for later programming.
2641 */
2642void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2643{
2644 port = drm_dp_get_validated_port_ref(mgr, port);
2645 if (!port)
2646 return;
2647 port->vcpi.num_slots = 0;
2648 drm_dp_put_port(port);
2649}
2650EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2651
2652/**
2653 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2654 * @mgr: manager for this port
2655 * @port: unverified port to deallocate vcpi for
2656 */
2657void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2658{
2659 port = drm_dp_get_validated_port_ref(mgr, port);
2660 if (!port)
2661 return;
2662
2663 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2664 port->vcpi.num_slots = 0;
2665 port->vcpi.pbn = 0;
2666 port->vcpi.aligned_pbn = 0;
2667 port->vcpi.vcpi = 0;
2668 drm_dp_put_port(port);
2669}
2670EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2671
2672static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2673 int id, struct drm_dp_payload *payload)
2674{
2675 u8 payload_alloc[3], status;
2676 int ret;
2677 int retries = 0;
2678
2679 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2680 DP_PAYLOAD_TABLE_UPDATED);
2681
2682 payload_alloc[0] = id;
2683 payload_alloc[1] = payload->start_slot;
2684 payload_alloc[2] = payload->num_slots;
2685
2686 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2687 if (ret != 3) {
2688 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2689 goto fail;
2690 }
2691
2692retry:
2693 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2694 if (ret < 0) {
2695 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2696 goto fail;
2697 }
2698
2699 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2700 retries++;
2701 if (retries < 20) {
2702 usleep_range(10000, 20000);
2703 goto retry;
2704 }
2705 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2706 ret = -EINVAL;
2707 goto fail;
2708 }
2709 ret = 0;
2710fail:
2711 return ret;
2712}
2713
2714
2715/**
2716 * drm_dp_check_act_status() - Check ACT handled status.
2717 * @mgr: manager to use
2718 *
2719 * Check the payload status bits in the DPCD for ACT handled completion.
2720 */
2721int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2722{
2723 u8 status;
2724 int ret;
2725 int count = 0;
2726
2727 do {
2728 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2729
2730 if (ret < 0) {
2731 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2732 goto fail;
2733 }
2734
2735 if (status & DP_PAYLOAD_ACT_HANDLED)
2736 break;
2737 count++;
2738 udelay(100);
2739
2740 } while (count < 30);
2741
2742 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2743 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2744 ret = -EINVAL;
2745 goto fail;
2746 }
2747 return 0;
2748fail:
2749 return ret;
2750}
2751EXPORT_SYMBOL(drm_dp_check_act_status);
2752
2753/**
2754 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2755 * @clock: dot clock for the mode
2756 * @bpp: bpp for the mode.
2757 *
2758 * This uses the formula in the spec to calculate the PBN value for a mode.
2759 */
2760int drm_dp_calc_pbn_mode(int clock, int bpp)
2761{
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002762 u64 kbps;
2763 s64 peak_kbps;
2764 u32 numerator;
2765 u32 denominator;
Dave Airliead7f8a12014-06-05 14:01:32 +10002766
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002767 kbps = clock * bpp;
Dave Airliead7f8a12014-06-05 14:01:32 +10002768
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002769 /*
2770 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2771 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2772 * common multiplier to render an integer PBN for all link rate/lane
2773 * counts combinations
2774 * calculate
2775 * peak_kbps *= (1006/1000)
2776 * peak_kbps *= (64/54)
2777 * peak_kbps *= 8 convert to bytes
2778 */
Dave Airliead7f8a12014-06-05 14:01:32 +10002779
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002780 numerator = 64 * 1006;
2781 denominator = 54 * 8 * 1000 * 1000;
Dave Airliead7f8a12014-06-05 14:01:32 +10002782
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002783 kbps *= numerator;
2784 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2785
2786 return drm_fixp2int_ceil(peak_kbps);
Dave Airliead7f8a12014-06-05 14:01:32 +10002787}
2788EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2789
2790static int test_calc_pbn_mode(void)
2791{
2792 int ret;
2793 ret = drm_dp_calc_pbn_mode(154000, 30);
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002794 if (ret != 689) {
2795 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2796 154000, 30, 689, ret);
Dave Airliead7f8a12014-06-05 14:01:32 +10002797 return -EINVAL;
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002798 }
Dave Airliead7f8a12014-06-05 14:01:32 +10002799 ret = drm_dp_calc_pbn_mode(234000, 30);
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002800 if (ret != 1047) {
2801 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2802 234000, 30, 1047, ret);
Dave Airliead7f8a12014-06-05 14:01:32 +10002803 return -EINVAL;
Harry Wentlanda9ebb3e2016-01-22 17:07:26 -05002804 }
2805 ret = drm_dp_calc_pbn_mode(297000, 24);
2806 if (ret != 1063) {
2807 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2808 297000, 24, 1063, ret);
2809 return -EINVAL;
2810 }
Dave Airliead7f8a12014-06-05 14:01:32 +10002811 return 0;
2812}
2813
2814/* we want to kick the TX after we've ack the up/down IRQs. */
2815static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2816{
2817 queue_work(system_long_wq, &mgr->tx_work);
2818}
2819
2820static void drm_dp_mst_dump_mstb(struct seq_file *m,
2821 struct drm_dp_mst_branch *mstb)
2822{
2823 struct drm_dp_mst_port *port;
2824 int tabs = mstb->lct;
2825 char prefix[10];
2826 int i;
2827
2828 for (i = 0; i < tabs; i++)
2829 prefix[i] = '\t';
2830 prefix[i] = '\0';
2831
2832 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2833 list_for_each_entry(port, &mstb->ports, next) {
Jim Bride51108f22016-04-14 10:18:36 -07002834 seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector);
Dave Airliead7f8a12014-06-05 14:01:32 +10002835 if (port->mstb)
2836 drm_dp_mst_dump_mstb(m, port->mstb);
2837 }
2838}
2839
2840static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2841 char *buf)
2842{
Dave Airliead7f8a12014-06-05 14:01:32 +10002843 int i;
Joe Perches46466b02017-05-30 16:35:37 -07002844
2845 for (i = 0; i < 64; i += 16) {
2846 if (drm_dp_dpcd_read(mgr->aux,
2847 DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
2848 &buf[i], 16) != 16)
2849 return false;
Dave Airliead7f8a12014-06-05 14:01:32 +10002850 }
Joe Perches46466b02017-05-30 16:35:37 -07002851 return true;
Dave Airliead7f8a12014-06-05 14:01:32 +10002852}
2853
Jim Bride51108f22016-04-14 10:18:36 -07002854static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2855 struct drm_dp_mst_port *port, char *name,
2856 int namelen)
2857{
2858 struct edid *mst_edid;
2859
2860 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2861 drm_edid_get_monitor_name(mst_edid, name, namelen);
2862}
2863
Dave Airliead7f8a12014-06-05 14:01:32 +10002864/**
2865 * drm_dp_mst_dump_topology(): dump topology to seq file.
2866 * @m: seq_file to dump output to
2867 * @mgr: manager to dump current topology for.
2868 *
2869 * helper to dump MST topology to a seq file for debugfs.
2870 */
2871void drm_dp_mst_dump_topology(struct seq_file *m,
2872 struct drm_dp_mst_topology_mgr *mgr)
2873{
2874 int i;
2875 struct drm_dp_mst_port *port;
Jim Bride51108f22016-04-14 10:18:36 -07002876
Dave Airliead7f8a12014-06-05 14:01:32 +10002877 mutex_lock(&mgr->lock);
2878 if (mgr->mst_primary)
2879 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2880
2881 /* dump VCPIs */
2882 mutex_unlock(&mgr->lock);
2883
2884 mutex_lock(&mgr->payload_lock);
Jim Bride51108f22016-04-14 10:18:36 -07002885 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2886 mgr->max_payloads);
Dave Airliead7f8a12014-06-05 14:01:32 +10002887
2888 for (i = 0; i < mgr->max_payloads; i++) {
2889 if (mgr->proposed_vcpis[i]) {
Jim Bride51108f22016-04-14 10:18:36 -07002890 char name[14];
2891
Dave Airliead7f8a12014-06-05 14:01:32 +10002892 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
Jim Bride51108f22016-04-14 10:18:36 -07002893 fetch_monitor_name(mgr, port, name, sizeof(name));
2894 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2895 port->port_num, port->vcpi.vcpi,
2896 port->vcpi.num_slots,
2897 (*name != 0) ? name : "Unknown");
Dave Airliead7f8a12014-06-05 14:01:32 +10002898 } else
Jim Bride51108f22016-04-14 10:18:36 -07002899 seq_printf(m, "vcpi %d:unused\n", i);
Dave Airliead7f8a12014-06-05 14:01:32 +10002900 }
2901 for (i = 0; i < mgr->max_payloads; i++) {
2902 seq_printf(m, "payload %d: %d, %d, %d\n",
2903 i,
2904 mgr->payloads[i].payload_state,
2905 mgr->payloads[i].start_slot,
2906 mgr->payloads[i].num_slots);
2907
2908
2909 }
2910 mutex_unlock(&mgr->payload_lock);
2911
2912 mutex_lock(&mgr->lock);
2913 if (mgr->mst_primary) {
2914 u8 buf[64];
Dave Airliead7f8a12014-06-05 14:01:32 +10002915 int ret;
Joe Perches46466b02017-05-30 16:35:37 -07002916
Dave Airliead7f8a12014-06-05 14:01:32 +10002917 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
Joe Perches46466b02017-05-30 16:35:37 -07002918 seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
Dave Airliead7f8a12014-06-05 14:01:32 +10002919 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
Joe Perches46466b02017-05-30 16:35:37 -07002920 seq_printf(m, "faux/mst: %*ph\n", 2, buf);
Dave Airliead7f8a12014-06-05 14:01:32 +10002921 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
Joe Perches46466b02017-05-30 16:35:37 -07002922 seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
Dave Airliead7f8a12014-06-05 14:01:32 +10002923
Dave Airlie44790462015-07-14 11:33:31 +10002924 /* dump the standard OUI branch header */
2925 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
Joe Perches46466b02017-05-30 16:35:37 -07002926 seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
Jim Bride51108f22016-04-14 10:18:36 -07002927 for (i = 0x3; i < 0x8 && buf[i]; i++)
Dave Airlie44790462015-07-14 11:33:31 +10002928 seq_printf(m, "%c", buf[i]);
Joe Perches46466b02017-05-30 16:35:37 -07002929 seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
2930 buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2931 if (dump_dp_payload_table(mgr, buf))
2932 seq_printf(m, "payload table: %*ph\n", 63, buf);
Dave Airliead7f8a12014-06-05 14:01:32 +10002933
2934 }
2935
2936 mutex_unlock(&mgr->lock);
2937
2938}
2939EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2940
2941static void drm_dp_tx_work(struct work_struct *work)
2942{
2943 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2944
2945 mutex_lock(&mgr->qlock);
Daniel Vettercb021a32016-07-15 21:48:03 +02002946 if (!list_empty(&mgr->tx_msg_downq))
Dave Airliead7f8a12014-06-05 14:01:32 +10002947 process_single_down_tx_qlock(mgr);
2948 mutex_unlock(&mgr->qlock);
2949}
2950
Mykola Lysenko91a25e42016-01-27 09:39:36 -05002951static void drm_dp_free_mst_port(struct kref *kref)
2952{
2953 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
2954 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
2955 kfree(port);
2956}
2957
Dave Airlie6b8eeca2015-06-15 10:34:28 +10002958static void drm_dp_destroy_connector_work(struct work_struct *work)
2959{
2960 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
Maarten Lankhorst4772ff02015-08-11 09:54:29 +02002961 struct drm_dp_mst_port *port;
Dave Airliedf4839f2015-09-16 10:37:28 +10002962 bool send_hotplug = false;
Dave Airlie6b8eeca2015-06-15 10:34:28 +10002963 /*
2964 * Not a regular list traverse as we have to drop the destroy
2965 * connector lock before destroying the connector, to avoid AB->BA
2966 * ordering between this lock and the config mutex.
2967 */
2968 for (;;) {
2969 mutex_lock(&mgr->destroy_connector_lock);
Maarten Lankhorst4772ff02015-08-11 09:54:29 +02002970 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2971 if (!port) {
Dave Airlie6b8eeca2015-06-15 10:34:28 +10002972 mutex_unlock(&mgr->destroy_connector_lock);
2973 break;
2974 }
Maarten Lankhorst4772ff02015-08-11 09:54:29 +02002975 list_del(&port->next);
Dave Airlie6b8eeca2015-06-15 10:34:28 +10002976 mutex_unlock(&mgr->destroy_connector_lock);
2977
Mykola Lysenko91a25e42016-01-27 09:39:36 -05002978 kref_init(&port->kref);
2979 INIT_LIST_HEAD(&port->next);
2980
Maarten Lankhorst4772ff02015-08-11 09:54:29 +02002981 mgr->cbs->destroy_connector(mgr, port->connector);
2982
2983 drm_dp_port_teardown_pdt(port, port->pdt);
Ville Syrjälä36e3fa62016-10-26 16:30:33 +03002984 port->pdt = DP_PEER_DEVICE_NONE;
Maarten Lankhorst4772ff02015-08-11 09:54:29 +02002985
Mykola Lysenko91a25e42016-01-27 09:39:36 -05002986 if (!port->input && port->vcpi.vcpi > 0) {
Andrey Grodzovskyfd2d2ba2016-05-25 16:45:43 -04002987 drm_dp_mst_reset_vcpi_slots(mgr, port);
2988 drm_dp_update_payload_part1(mgr);
2989 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
Mykola Lysenko91a25e42016-01-27 09:39:36 -05002990 }
2991
2992 kref_put(&port->kref, drm_dp_free_mst_port);
Dave Airliedf4839f2015-09-16 10:37:28 +10002993 send_hotplug = true;
Dave Airlie6b8eeca2015-06-15 10:34:28 +10002994 }
Dave Airliedf4839f2015-09-16 10:37:28 +10002995 if (send_hotplug)
2996 (*mgr->cbs->hotplug)(mgr);
Dave Airlie6b8eeca2015-06-15 10:34:28 +10002997}
2998
Ville Syrjäläa4370c72017-07-12 18:51:02 +03002999static struct drm_private_state *
3000drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003001{
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003002 struct drm_dp_mst_topology_state *state;
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003003
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003004 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
3005 if (!state)
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003006 return NULL;
3007
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003008 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
3009
3010 return &state->base;
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003011}
3012
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003013static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
3014 struct drm_private_state *state)
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003015{
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003016 struct drm_dp_mst_topology_state *mst_state =
3017 to_dp_mst_topology_state(state);
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003018
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003019 kfree(mst_state);
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003020}
3021
3022static const struct drm_private_state_funcs mst_state_funcs = {
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003023 .atomic_duplicate_state = drm_dp_mst_duplicate_state,
3024 .atomic_destroy_state = drm_dp_mst_destroy_state,
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003025};
3026
3027/**
3028 * drm_atomic_get_mst_topology_state: get MST topology state
3029 *
3030 * @state: global atomic state
3031 * @mgr: MST topology manager, also the private object in this case
3032 *
3033 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
3034 * state vtable so that the private object state returned is that of a MST
3035 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
3036 * to care of the locking, so warn if don't hold the connection_mutex.
3037 *
3038 * RETURNS:
3039 *
3040 * The MST topology state or error pointer.
3041 */
3042struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
3043 struct drm_dp_mst_topology_mgr *mgr)
3044{
3045 struct drm_device *dev = mgr->dev;
3046
3047 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003048 return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003049}
3050EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
3051
Dave Airliead7f8a12014-06-05 14:01:32 +10003052/**
3053 * drm_dp_mst_topology_mgr_init - initialise a topology manager
3054 * @mgr: manager struct to initialise
3055 * @dev: device providing this structure - for i2c addition.
3056 * @aux: DP helper aux channel to talk to this device
3057 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
3058 * @max_payloads: maximum number of payloads this GPU can source
3059 * @conn_base_id: the connector object ID the MST device is connected to.
3060 *
3061 * Return 0 for success, or negative error code on failure
3062 */
3063int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
Dhinakaran Pandiyan7b0a89a2017-01-24 15:49:29 -08003064 struct drm_device *dev, struct drm_dp_aux *aux,
Dave Airliead7f8a12014-06-05 14:01:32 +10003065 int max_dpcd_transaction_bytes,
3066 int max_payloads, int conn_base_id)
3067{
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003068 struct drm_dp_mst_topology_state *mst_state;
3069
Dave Airliead7f8a12014-06-05 14:01:32 +10003070 mutex_init(&mgr->lock);
3071 mutex_init(&mgr->qlock);
3072 mutex_init(&mgr->payload_lock);
Dave Airlie6b8eeca2015-06-15 10:34:28 +10003073 mutex_init(&mgr->destroy_connector_lock);
Dave Airliead7f8a12014-06-05 14:01:32 +10003074 INIT_LIST_HEAD(&mgr->tx_msg_downq);
Dave Airlie6b8eeca2015-06-15 10:34:28 +10003075 INIT_LIST_HEAD(&mgr->destroy_connector_list);
Dave Airliead7f8a12014-06-05 14:01:32 +10003076 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3077 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
Dave Airlie6b8eeca2015-06-15 10:34:28 +10003078 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
Dave Airliead7f8a12014-06-05 14:01:32 +10003079 init_waitqueue_head(&mgr->tx_waitq);
3080 mgr->dev = dev;
3081 mgr->aux = aux;
3082 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3083 mgr->max_payloads = max_payloads;
3084 mgr->conn_base_id = conn_base_id;
Imre Deak4d6a10d2016-01-29 14:44:29 +02003085 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3086 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3087 return -EINVAL;
Dave Airliead7f8a12014-06-05 14:01:32 +10003088 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3089 if (!mgr->payloads)
3090 return -ENOMEM;
3091 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3092 if (!mgr->proposed_vcpis)
3093 return -ENOMEM;
3094 set_bit(0, &mgr->payload_mask);
Imre Deak441388a2016-01-29 14:44:28 +02003095 if (test_calc_pbn_mode() < 0)
3096 DRM_ERROR("MST PBN self-test failed\n");
3097
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003098 mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
3099 if (mst_state == NULL)
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003100 return -ENOMEM;
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003101
3102 mst_state->mgr = mgr;
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003103
3104 /* max. time slots - one slot for MTP header */
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003105 mst_state->avail_slots = 63;
3106
3107 drm_atomic_private_obj_init(&mgr->base,
3108 &mst_state->base,
3109 &mst_state_funcs);
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003110
Dave Airliead7f8a12014-06-05 14:01:32 +10003111 return 0;
3112}
3113EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3114
3115/**
3116 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3117 * @mgr: manager to destroy
3118 */
3119void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3120{
Dave Airlie274d8352015-09-30 10:39:42 +10003121 flush_work(&mgr->work);
Dave Airlie6b8eeca2015-06-15 10:34:28 +10003122 flush_work(&mgr->destroy_connector_work);
Dave Airliead7f8a12014-06-05 14:01:32 +10003123 mutex_lock(&mgr->payload_lock);
3124 kfree(mgr->payloads);
3125 mgr->payloads = NULL;
3126 kfree(mgr->proposed_vcpis);
3127 mgr->proposed_vcpis = NULL;
3128 mutex_unlock(&mgr->payload_lock);
3129 mgr->dev = NULL;
3130 mgr->aux = NULL;
Ville Syrjäläa4370c72017-07-12 18:51:02 +03003131 drm_atomic_private_obj_fini(&mgr->base);
Pandiyan, Dhinakaran3f3353b2017-04-20 22:51:31 -07003132 mgr->funcs = NULL;
Dave Airliead7f8a12014-06-05 14:01:32 +10003133}
3134EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3135
3136/* I2C device */
3137static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3138 int num)
3139{
3140 struct drm_dp_aux *aux = adapter->algo_data;
3141 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3142 struct drm_dp_mst_branch *mstb;
3143 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3144 unsigned int i;
3145 bool reading = false;
3146 struct drm_dp_sideband_msg_req_body msg;
3147 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3148 int ret;
3149
3150 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3151 if (!mstb)
3152 return -EREMOTEIO;
3153
3154 /* construct i2c msg */
3155 /* see if last msg is a read */
3156 if (msgs[num - 1].flags & I2C_M_RD)
3157 reading = true;
3158
Dave Airlieae491542015-10-14 18:51:17 +10003159 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
Dave Airliead7f8a12014-06-05 14:01:32 +10003160 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3161 ret = -EIO;
3162 goto out;
3163 }
3164
Dave Airlieae491542015-10-14 18:51:17 +10003165 memset(&msg, 0, sizeof(msg));
Dave Airliead7f8a12014-06-05 14:01:32 +10003166 msg.req_type = DP_REMOTE_I2C_READ;
3167 msg.u.i2c_read.num_transactions = num - 1;
3168 msg.u.i2c_read.port_number = port->port_num;
3169 for (i = 0; i < num - 1; i++) {
3170 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3171 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3172 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3173 }
3174 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3175 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3176
3177 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3178 if (!txmsg) {
3179 ret = -ENOMEM;
3180 goto out;
3181 }
3182
3183 txmsg->dst = mstb;
3184 drm_dp_encode_sideband_req(&msg, txmsg);
3185
3186 drm_dp_queue_down_tx(mgr, txmsg);
3187
3188 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3189 if (ret > 0) {
3190
3191 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3192 ret = -EREMOTEIO;
3193 goto out;
3194 }
3195 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3196 ret = -EIO;
3197 goto out;
3198 }
3199 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3200 ret = num;
3201 }
3202out:
3203 kfree(txmsg);
3204 drm_dp_put_mst_branch_device(mstb);
3205 return ret;
3206}
3207
3208static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3209{
3210 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3211 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3212 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3213 I2C_FUNC_10BIT_ADDR;
3214}
3215
3216static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3217 .functionality = drm_dp_mst_i2c_functionality,
3218 .master_xfer = drm_dp_mst_i2c_xfer,
3219};
3220
3221/**
3222 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3223 * @aux: DisplayPort AUX channel
3224 *
3225 * Returns 0 on success or a negative error code on failure.
3226 */
3227static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3228{
3229 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3230 aux->ddc.algo_data = aux;
3231 aux->ddc.retries = 3;
3232
3233 aux->ddc.class = I2C_CLASS_DDC;
3234 aux->ddc.owner = THIS_MODULE;
3235 aux->ddc.dev.parent = aux->dev;
3236 aux->ddc.dev.of_node = aux->dev->of_node;
3237
3238 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3239 sizeof(aux->ddc.name));
3240
3241 return i2c_add_adapter(&aux->ddc);
3242}
3243
3244/**
3245 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3246 * @aux: DisplayPort AUX channel
3247 */
3248static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3249{
3250 i2c_del_adapter(&aux->ddc);
3251}