1/* Copyright 2021 Advanced Micro Devices, Inc. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a
4 * copy of this software and associated documentation files (the "Software"),
5 * to deal in the Software without restriction, including without limitation
6 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
7 * and/or sell copies of the Software, and to permit persons to whom the
8 * Software is furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
16 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
17 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
18 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
19 * OTHER DEALINGS IN THE SOFTWARE.
20 *
21 * Authors: AMD
22 *
23 */
24
25#include "link_enc_cfg.h"
26#include "resource.h"
27#include "link.h"
28
29#define DC_LOGGER dc->ctx->logger
30
31/* Check whether stream is supported by DIG link encoders. */
32static bool is_dig_link_enc_stream(struct dc_stream_state *stream)
33{
34 bool is_dig_stream = false;
35 struct link_encoder *link_enc = NULL;
36 int i;
37
38 /* Loop over created link encoder objects. */
39 if (stream) {
40 for (i = 0; i < stream->ctx->dc->res_pool->res_cap->num_dig_link_enc; i++) {
41 link_enc = stream->ctx->dc->res_pool->link_encoders[i];
42
43 /* Need to check link signal type rather than stream signal type which may not
44 * yet match.
45 */
46 if (link_enc && ((uint32_t)stream->link->connector_signal & link_enc->output_signals)) {
47 if (dc_is_dp_signal(signal: stream->signal)) {
48 /* DIGs do not support DP2.0 streams with 128b/132b encoding. */
49 struct dc_link_settings link_settings = {0};
50
51 stream->ctx->dc->link_srv->dp_decide_link_settings(stream, &link_settings);
52 if ((link_settings.link_rate >= LINK_RATE_LOW) &&
53 link_settings.link_rate <= LINK_RATE_HIGH3) {
54 is_dig_stream = true;
55 break;
56 }
57 } else {
58 is_dig_stream = true;
59 break;
60 }
61 }
62 }
63 }
64 return is_dig_stream;
65}
66
67static struct link_enc_assignment get_assignment(struct dc *dc, int i)
68{
69 struct link_enc_assignment assignment;
70
71 if (dc->current_state->res_ctx.link_enc_cfg_ctx.mode == LINK_ENC_CFG_TRANSIENT)
72 assignment = dc->current_state->res_ctx.link_enc_cfg_ctx.transient_assignments[i];
73 else /* LINK_ENC_CFG_STEADY */
74 assignment = dc->current_state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
75
76 return assignment;
77}
78
79/* Return stream using DIG link encoder resource. NULL if unused. */
80static struct dc_stream_state *get_stream_using_link_enc(
81 struct dc_state *state,
82 enum engine_id eng_id)
83{
84 struct dc_stream_state *stream = NULL;
85 int i;
86
87 for (i = 0; i < state->stream_count; i++) {
88 struct link_enc_assignment assignment = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
89
90 if ((assignment.valid == true) && (assignment.eng_id == eng_id)) {
91 stream = state->streams[i];
92 break;
93 }
94 }
95
96 return stream;
97}
98
99static void remove_link_enc_assignment(
100 struct dc_state *state,
101 struct dc_stream_state *stream,
102 enum engine_id eng_id)
103{
104 int eng_idx;
105 int i;
106
107 if (eng_id != ENGINE_ID_UNKNOWN) {
108 eng_idx = eng_id - ENGINE_ID_DIGA;
109
110 /* stream ptr of stream in dc_state used to update correct entry in
111 * link_enc_assignments table.
112 */
113 for (i = 0; i < MAX_PIPES; i++) {
114 struct link_enc_assignment assignment = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
115
116 if (assignment.valid && assignment.stream == stream) {
117 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].valid = false;
118 /* Only add link encoder back to availability pool if not being
119 * used by any other stream (i.e. removing SST stream or last MST stream).
120 */
121 if (get_stream_using_link_enc(state, eng_id) == NULL)
122 state->res_ctx.link_enc_cfg_ctx.link_enc_avail[eng_idx] = eng_id;
123
124 stream->link_enc = NULL;
125 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].eng_id = ENGINE_ID_UNKNOWN;
126 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].stream = NULL;
127 dc_stream_release(dc_stream: stream);
128 break;
129 }
130 }
131 }
132}
133
134static void add_link_enc_assignment(
135 struct dc_state *state,
136 struct dc_stream_state *stream,
137 enum engine_id eng_id)
138{
139 int eng_idx;
140 int i;
141
142 if (eng_id != ENGINE_ID_UNKNOWN) {
143 eng_idx = eng_id - ENGINE_ID_DIGA;
144
145 /* stream ptr of stream in dc_state used to update correct entry in
146 * link_enc_assignments table.
147 */
148 for (i = 0; i < state->stream_count; i++) {
149 if (stream == state->streams[i]) {
150 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i] = (struct link_enc_assignment){
151 .valid = true,
152 .ep_id = (struct display_endpoint_id) {
153 .link_id = stream->link->link_id,
154 .ep_type = stream->link->ep_type},
155 .eng_id = eng_id,
156 .stream = stream};
157 dc_stream_retain(dc_stream: stream);
158 state->res_ctx.link_enc_cfg_ctx.link_enc_avail[eng_idx] = ENGINE_ID_UNKNOWN;
159 stream->link_enc = stream->ctx->dc->res_pool->link_encoders[eng_idx];
160 break;
161 }
162 }
163
164 /* Attempted to add an encoder assignment for a stream not in dc_state. */
165 ASSERT(i != state->stream_count);
166 }
167}
168
169/* Return first available DIG link encoder. */
170static enum engine_id find_first_avail_link_enc(
171 const struct dc_context *ctx,
172 const struct dc_state *state,
173 enum engine_id eng_id_requested)
174{
175 enum engine_id eng_id = ENGINE_ID_UNKNOWN;
176 int i;
177
178 if (eng_id_requested != ENGINE_ID_UNKNOWN) {
179
180 for (i = 0; i < ctx->dc->res_pool->res_cap->num_dig_link_enc; i++) {
181 eng_id = state->res_ctx.link_enc_cfg_ctx.link_enc_avail[i];
182 if (eng_id == eng_id_requested)
183 return eng_id;
184 }
185 }
186
187 eng_id = ENGINE_ID_UNKNOWN;
188
189 for (i = 0; i < ctx->dc->res_pool->res_cap->num_dig_link_enc; i++) {
190 eng_id = state->res_ctx.link_enc_cfg_ctx.link_enc_avail[i];
191 if (eng_id != ENGINE_ID_UNKNOWN)
192 break;
193 }
194
195 return eng_id;
196}
197
198/* Check for availability of link encoder eng_id. */
199static bool is_avail_link_enc(struct dc_state *state, enum engine_id eng_id, struct dc_stream_state *stream)
200{
201 bool is_avail = false;
202 int eng_idx = eng_id - ENGINE_ID_DIGA;
203
204 /* An encoder is available if it is still in the availability pool. */
205 if (eng_id != ENGINE_ID_UNKNOWN && state->res_ctx.link_enc_cfg_ctx.link_enc_avail[eng_idx] != ENGINE_ID_UNKNOWN) {
206 is_avail = true;
207 } else {
208 struct dc_stream_state *stream_assigned = NULL;
209
210 /* MST streams share the same link and should share the same encoder.
211 * If a stream that has already been assigned a link encoder uses as the
212 * same link as the stream checking for availability, it is an MST stream
213 * and should use the same link encoder.
214 */
215 stream_assigned = get_stream_using_link_enc(state, eng_id);
216 if (stream_assigned && stream != stream_assigned && stream->link == stream_assigned->link)
217 is_avail = true;
218 }
219
220 return is_avail;
221}
222
223/* Test for display_endpoint_id equality. */
224static bool are_ep_ids_equal(struct display_endpoint_id *lhs, struct display_endpoint_id *rhs)
225{
226 bool are_equal = false;
227
228 if (lhs->link_id.id == rhs->link_id.id &&
229 lhs->link_id.enum_id == rhs->link_id.enum_id &&
230 lhs->link_id.type == rhs->link_id.type &&
231 lhs->ep_type == rhs->ep_type)
232 are_equal = true;
233
234 return are_equal;
235}
236
237static struct link_encoder *get_link_enc_used_by_link(
238 struct dc_state *state,
239 const struct dc_link *link)
240{
241 struct link_encoder *link_enc = NULL;
242 struct display_endpoint_id ep_id;
243 int i;
244
245 ep_id = (struct display_endpoint_id) {
246 .link_id = link->link_id,
247 .ep_type = link->ep_type};
248
249 for (i = 0; i < MAX_PIPES; i++) {
250 struct link_enc_assignment assignment = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
251
252 if (assignment.valid == true && are_ep_ids_equal(lhs: &assignment.ep_id, rhs: &ep_id))
253 link_enc = link->dc->res_pool->link_encoders[assignment.eng_id - ENGINE_ID_DIGA];
254 }
255
256 return link_enc;
257}
258/* Clear all link encoder assignments. */
259static void clear_enc_assignments(const struct dc *dc, struct dc_state *state)
260{
261 int i;
262
263 for (i = 0; i < MAX_PIPES; i++) {
264 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].valid = false;
265 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].eng_id = ENGINE_ID_UNKNOWN;
266 if (state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].stream != NULL) {
267 dc_stream_release(dc_stream: state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].stream);
268 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].stream = NULL;
269 }
270 }
271
272 for (i = 0; i < dc->res_pool->res_cap->num_dig_link_enc; i++) {
273 if (dc->res_pool->link_encoders[i])
274 state->res_ctx.link_enc_cfg_ctx.link_enc_avail[i] = (enum engine_id) i;
275 else
276 state->res_ctx.link_enc_cfg_ctx.link_enc_avail[i] = ENGINE_ID_UNKNOWN;
277 }
278}
279
280void link_enc_cfg_init(
281 const struct dc *dc,
282 struct dc_state *state)
283{
284 clear_enc_assignments(dc, state);
285
286 state->res_ctx.link_enc_cfg_ctx.mode = LINK_ENC_CFG_STEADY;
287}
288
289void link_enc_cfg_copy(const struct dc_state *src_ctx, struct dc_state *dst_ctx)
290{
291 memcpy(&dst_ctx->res_ctx.link_enc_cfg_ctx,
292 &src_ctx->res_ctx.link_enc_cfg_ctx,
293 sizeof(dst_ctx->res_ctx.link_enc_cfg_ctx));
294}
295
296void link_enc_cfg_link_encs_assign(
297 struct dc *dc,
298 struct dc_state *state,
299 struct dc_stream_state *streams[],
300 uint8_t stream_count)
301{
302 enum engine_id eng_id = ENGINE_ID_UNKNOWN, eng_id_req = ENGINE_ID_UNKNOWN;
303 int i;
304 int j;
305
306 ASSERT(state->stream_count == stream_count);
307 ASSERT(dc->current_state->res_ctx.link_enc_cfg_ctx.mode == LINK_ENC_CFG_STEADY);
308
309 /* Release DIG link encoder resources before running assignment algorithm. */
310 for (i = 0; i < dc->current_state->stream_count; i++)
311 dc->res_pool->funcs->link_enc_unassign(state, dc->current_state->streams[i]);
312
313 for (i = 0; i < MAX_PIPES; i++)
314 ASSERT(state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i].valid == false);
315
316 /* (a) Assign DIG link encoders to physical (unmappable) endpoints first. */
317 for (i = 0; i < stream_count; i++) {
318 struct dc_stream_state *stream = streams[i];
319
320 /* skip it if the link is mappable endpoint. */
321 if (stream->link->is_dig_mapping_flexible)
322 continue;
323
324 /* Skip stream if not supported by DIG link encoder. */
325 if (!is_dig_link_enc_stream(stream))
326 continue;
327
328 /* Physical endpoints have a fixed mapping to DIG link encoders. */
329 eng_id = stream->link->eng_id;
330 add_link_enc_assignment(state, stream, eng_id);
331 }
332
333 /* (b) Retain previous assignments for mappable endpoints if encoders still available. */
334 eng_id = ENGINE_ID_UNKNOWN;
335
336 if (state != dc->current_state) {
337 struct dc_state *prev_state = dc->current_state;
338
339 for (i = 0; i < stream_count; i++) {
340 struct dc_stream_state *stream = state->streams[i];
341
342 /* Skip it if the link is NOT mappable endpoint. */
343 if (!stream->link->is_dig_mapping_flexible)
344 continue;
345
346 /* Skip stream if not supported by DIG link encoder. */
347 if (!is_dig_link_enc_stream(stream))
348 continue;
349
350 for (j = 0; j < prev_state->stream_count; j++) {
351 struct dc_stream_state *prev_stream = prev_state->streams[j];
352
353 if (stream == prev_stream && stream->link == prev_stream->link &&
354 prev_state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[j].valid) {
355 eng_id = prev_state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[j].eng_id;
356
357 if (is_avail_link_enc(state, eng_id, stream))
358 add_link_enc_assignment(state, stream, eng_id);
359 }
360 }
361 }
362 }
363
364 /* (c) Then assign encoders to remaining mappable endpoints. */
365 eng_id = ENGINE_ID_UNKNOWN;
366
367 for (i = 0; i < stream_count; i++) {
368 struct dc_stream_state *stream = streams[i];
369 struct link_encoder *link_enc = NULL;
370
371 /* Skip it if the link is NOT mappable endpoint. */
372 if (!stream->link->is_dig_mapping_flexible)
373 continue;
374
375 /* Skip if encoder assignment retained in step (b) above. */
376 if (stream->link_enc)
377 continue;
378
379 /* Skip stream if not supported by DIG link encoder. */
380 if (!is_dig_link_enc_stream(stream)) {
381 ASSERT(stream->link->is_dig_mapping_flexible != true);
382 continue;
383 }
384
385 /* Mappable endpoints have a flexible mapping to DIG link encoders. */
386
387 /* For MST, multiple streams will share the same link / display
388 * endpoint. These streams should use the same link encoder
389 * assigned to that endpoint.
390 */
391 link_enc = get_link_enc_used_by_link(state, link: stream->link);
392 if (link_enc == NULL) {
393
394 if (stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
395 stream->link->dpia_preferred_eng_id != ENGINE_ID_UNKNOWN)
396 eng_id_req = stream->link->dpia_preferred_eng_id;
397
398 eng_id = find_first_avail_link_enc(ctx: stream->ctx, state, eng_id_requested: eng_id_req);
399 }
400 else
401 eng_id = link_enc->preferred_engine;
402
403 add_link_enc_assignment(state, stream, eng_id);
404 }
405
406 link_enc_cfg_validate(dc, state);
407
408 /* Update transient assignments. */
409 for (i = 0; i < MAX_PIPES; i++) {
410 dc->current_state->res_ctx.link_enc_cfg_ctx.transient_assignments[i] =
411 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
412 }
413
414 /* Log encoder assignments. */
415 for (i = 0; i < MAX_PIPES; i++) {
416 struct link_enc_assignment assignment =
417 dc->current_state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
418
419 if (assignment.valid)
420 DC_LOG_DEBUG("%s: CUR %s(%d) - enc_id(%d)\n",
421 __func__,
422 assignment.ep_id.ep_type == DISPLAY_ENDPOINT_PHY ? "PHY" : "DPIA",
423 assignment.ep_id.ep_type == DISPLAY_ENDPOINT_PHY ?
424 assignment.ep_id.link_id.enum_id :
425 assignment.ep_id.link_id.enum_id - 1,
426 assignment.eng_id);
427 }
428 for (i = 0; i < MAX_PIPES; i++) {
429 struct link_enc_assignment assignment =
430 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
431
432 if (assignment.valid)
433 DC_LOG_DEBUG("%s: NEW %s(%d) - enc_id(%d)\n",
434 __func__,
435 assignment.ep_id.ep_type == DISPLAY_ENDPOINT_PHY ? "PHY" : "DPIA",
436 assignment.ep_id.ep_type == DISPLAY_ENDPOINT_PHY ?
437 assignment.ep_id.link_id.enum_id :
438 assignment.ep_id.link_id.enum_id - 1,
439 assignment.eng_id);
440 }
441
442 /* Current state mode will be set to steady once this state committed. */
443 state->res_ctx.link_enc_cfg_ctx.mode = LINK_ENC_CFG_STEADY;
444}
445
446void link_enc_cfg_link_enc_unassign(
447 struct dc_state *state,
448 struct dc_stream_state *stream)
449{
450 enum engine_id eng_id = ENGINE_ID_UNKNOWN;
451
452 if (stream->link_enc)
453 eng_id = stream->link_enc->preferred_engine;
454
455 remove_link_enc_assignment(state, stream, eng_id);
456}
457
458bool link_enc_cfg_is_transmitter_mappable(
459 struct dc *dc,
460 struct link_encoder *link_enc)
461{
462 bool is_mappable = false;
463 enum engine_id eng_id = link_enc->preferred_engine;
464 struct dc_stream_state *stream = link_enc_cfg_get_stream_using_link_enc(dc, eng_id);
465
466 if (stream)
467 is_mappable = stream->link->is_dig_mapping_flexible;
468
469 return is_mappable;
470}
471
472struct dc_stream_state *link_enc_cfg_get_stream_using_link_enc(
473 struct dc *dc,
474 enum engine_id eng_id)
475{
476 struct dc_stream_state *stream = NULL;
477 int i;
478
479 for (i = 0; i < MAX_PIPES; i++) {
480 struct link_enc_assignment assignment = get_assignment(dc, i);
481
482 if ((assignment.valid == true) && (assignment.eng_id == eng_id)) {
483 stream = assignment.stream;
484 break;
485 }
486 }
487
488 return stream;
489}
490
491struct dc_link *link_enc_cfg_get_link_using_link_enc(
492 struct dc *dc,
493 enum engine_id eng_id)
494{
495 struct dc_link *link = NULL;
496 struct dc_stream_state *stream = NULL;
497
498 stream = link_enc_cfg_get_stream_using_link_enc(dc, eng_id);
499
500 if (stream)
501 link = stream->link;
502
503 return link;
504}
505
506struct link_encoder *link_enc_cfg_get_link_enc_used_by_link(
507 struct dc *dc,
508 const struct dc_link *link)
509{
510 struct link_encoder *link_enc = NULL;
511 struct display_endpoint_id ep_id;
512 int i;
513
514 ep_id = (struct display_endpoint_id) {
515 .link_id = link->link_id,
516 .ep_type = link->ep_type};
517
518 for (i = 0; i < MAX_PIPES; i++) {
519 struct link_enc_assignment assignment = get_assignment(dc, i);
520
521 if (assignment.valid == true && are_ep_ids_equal(lhs: &assignment.ep_id, rhs: &ep_id)) {
522 link_enc = link->dc->res_pool->link_encoders[assignment.eng_id - ENGINE_ID_DIGA];
523 break;
524 }
525 }
526
527 return link_enc;
528}
529
530struct link_encoder *link_enc_cfg_get_next_avail_link_enc(struct dc *dc)
531{
532 struct link_encoder *link_enc = NULL;
533 enum engine_id encs_assigned[MAX_DIG_LINK_ENCODERS];
534 int i;
535
536 for (i = 0; i < MAX_DIG_LINK_ENCODERS; i++)
537 encs_assigned[i] = ENGINE_ID_UNKNOWN;
538
539 /* Add assigned encoders to list. */
540 for (i = 0; i < MAX_PIPES; i++) {
541 struct link_enc_assignment assignment = get_assignment(dc, i);
542
543 if (assignment.valid)
544 encs_assigned[assignment.eng_id - ENGINE_ID_DIGA] = assignment.eng_id;
545 }
546
547 for (i = 0; i < dc->res_pool->res_cap->num_dig_link_enc; i++) {
548 if (encs_assigned[i] == ENGINE_ID_UNKNOWN &&
549 dc->res_pool->link_encoders[i] != NULL) {
550 link_enc = dc->res_pool->link_encoders[i];
551 break;
552 }
553 }
554
555 return link_enc;
556}
557
558struct link_encoder *link_enc_cfg_get_link_enc_used_by_stream(
559 struct dc *dc,
560 const struct dc_stream_state *stream)
561{
562 struct link_encoder *link_enc;
563
564 link_enc = link_enc_cfg_get_link_enc_used_by_link(dc, link: stream->link);
565
566 return link_enc;
567}
568
569struct link_encoder *link_enc_cfg_get_link_enc(
570 const struct dc_link *link)
571{
572 struct link_encoder *link_enc = NULL;
573
574 /* Links supporting dynamically assigned link encoder will be assigned next
575 * available encoder if one not already assigned.
576 */
577 if (link->is_dig_mapping_flexible &&
578 link->dc->res_pool->funcs->link_encs_assign) {
579 link_enc = link_enc_cfg_get_link_enc_used_by_link(dc: link->ctx->dc, link);
580 if (link_enc == NULL)
581 link_enc = link_enc_cfg_get_next_avail_link_enc(
582 dc: link->ctx->dc);
583 } else
584 link_enc = link->link_enc;
585
586 return link_enc;
587}
588
589struct link_encoder *link_enc_cfg_get_link_enc_used_by_stream_current(
590 struct dc *dc,
591 const struct dc_stream_state *stream)
592{
593 struct link_encoder *link_enc = NULL;
594 struct display_endpoint_id ep_id;
595 int i;
596
597 ep_id = (struct display_endpoint_id) {
598 .link_id = stream->link->link_id,
599 .ep_type = stream->link->ep_type};
600
601 for (i = 0; i < MAX_PIPES; i++) {
602 struct link_enc_assignment assignment =
603 dc->current_state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
604
605 if (assignment.valid == true && are_ep_ids_equal(lhs: &assignment.ep_id, rhs: &ep_id)) {
606 link_enc = stream->link->dc->res_pool->link_encoders[assignment.eng_id - ENGINE_ID_DIGA];
607 break;
608 }
609 }
610
611 return link_enc;
612}
613
614bool link_enc_cfg_is_link_enc_avail(struct dc *dc, enum engine_id eng_id, struct dc_link *link)
615{
616 bool is_avail = true;
617 int i;
618
619 /* An encoder is not available if it has already been assigned to a different endpoint. */
620 for (i = 0; i < MAX_PIPES; i++) {
621 struct link_enc_assignment assignment = get_assignment(dc, i);
622 struct display_endpoint_id ep_id = (struct display_endpoint_id) {
623 .link_id = link->link_id,
624 .ep_type = link->ep_type};
625
626 if (assignment.valid && assignment.eng_id == eng_id && !are_ep_ids_equal(lhs: &ep_id, rhs: &assignment.ep_id)) {
627 is_avail = false;
628 break;
629 }
630 }
631
632 return is_avail;
633}
634
635bool link_enc_cfg_validate(struct dc *dc, struct dc_state *state)
636{
637 bool is_valid = false;
638 bool valid_entries = true;
639 bool valid_stream_ptrs = true;
640 bool valid_uniqueness = true;
641 bool valid_avail = true;
642 bool valid_streams = true;
643 int i, j;
644 uint8_t valid_count = 0;
645 uint8_t dig_stream_count = 0;
646 int eng_ids_per_ep_id[MAX_PIPES] = {0};
647 int ep_ids_per_eng_id[MAX_PIPES] = {0};
648 int valid_bitmap = 0;
649
650 /* (1) No. valid entries same as stream count. */
651 for (i = 0; i < MAX_PIPES; i++) {
652 struct link_enc_assignment assignment = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
653
654 if (assignment.valid)
655 valid_count++;
656
657 if (is_dig_link_enc_stream(stream: state->streams[i]))
658 dig_stream_count++;
659 }
660 if (valid_count != dig_stream_count)
661 valid_entries = false;
662
663 /* (2) Matching stream ptrs. */
664 for (i = 0; i < MAX_PIPES; i++) {
665 struct link_enc_assignment assignment = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
666
667 if (assignment.valid) {
668 if (assignment.stream != state->streams[i])
669 valid_stream_ptrs = false;
670 }
671 }
672
673 /* (3) Each endpoint assigned unique encoder. */
674 for (i = 0; i < MAX_PIPES; i++) {
675 struct link_enc_assignment assignment_i = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
676
677 if (assignment_i.valid) {
678 struct display_endpoint_id ep_id_i = assignment_i.ep_id;
679
680 eng_ids_per_ep_id[i]++;
681 ep_ids_per_eng_id[i]++;
682 for (j = 0; j < MAX_PIPES; j++) {
683 struct link_enc_assignment assignment_j =
684 state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[j];
685
686 if (j == i)
687 continue;
688
689 if (assignment_j.valid) {
690 struct display_endpoint_id ep_id_j = assignment_j.ep_id;
691
692 if (are_ep_ids_equal(lhs: &ep_id_i, rhs: &ep_id_j) &&
693 assignment_i.eng_id != assignment_j.eng_id) {
694 valid_uniqueness = false;
695 eng_ids_per_ep_id[i]++;
696 } else if (!are_ep_ids_equal(lhs: &ep_id_i, rhs: &ep_id_j) &&
697 assignment_i.eng_id == assignment_j.eng_id) {
698 valid_uniqueness = false;
699 ep_ids_per_eng_id[i]++;
700 }
701 }
702 }
703 }
704 }
705
706 /* (4) Assigned encoders not in available pool. */
707 for (i = 0; i < MAX_PIPES; i++) {
708 struct link_enc_assignment assignment = state->res_ctx.link_enc_cfg_ctx.link_enc_assignments[i];
709
710 if (assignment.valid) {
711 for (j = 0; j < dc->res_pool->res_cap->num_dig_link_enc; j++) {
712 if (state->res_ctx.link_enc_cfg_ctx.link_enc_avail[j] == assignment.eng_id) {
713 valid_avail = false;
714 break;
715 }
716 }
717 }
718 }
719
720 /* (5) All streams have valid link encoders. */
721 for (i = 0; i < state->stream_count; i++) {
722 struct dc_stream_state *stream = state->streams[i];
723
724 if (is_dig_link_enc_stream(stream) && stream->link_enc == NULL) {
725 valid_streams = false;
726 break;
727 }
728 }
729
730 is_valid = valid_entries && valid_stream_ptrs && valid_uniqueness && valid_avail && valid_streams;
731 ASSERT(is_valid);
732
733 if (is_valid == false) {
734 valid_bitmap =
735 (valid_entries & 0x1) |
736 ((valid_stream_ptrs & 0x1) << 1) |
737 ((valid_uniqueness & 0x1) << 2) |
738 ((valid_avail & 0x1) << 3) |
739 ((valid_streams & 0x1) << 4);
740 DC_LOG_ERROR("%s: Invalid link encoder assignments - 0x%x\n", __func__, valid_bitmap);
741 }
742
743 return is_valid;
744}
745
746void link_enc_cfg_set_transient_mode(struct dc *dc, struct dc_state *current_state, struct dc_state *new_state)
747{
748 int i = 0;
749 int num_transient_assignments = 0;
750
751 for (i = 0; i < MAX_PIPES; i++) {
752 if (current_state->res_ctx.link_enc_cfg_ctx.transient_assignments[i].valid)
753 num_transient_assignments++;
754 }
755
756 /* Only enter transient mode if the new encoder assignments are valid. */
757 if (new_state->stream_count == num_transient_assignments) {
758 current_state->res_ctx.link_enc_cfg_ctx.mode = LINK_ENC_CFG_TRANSIENT;
759 DC_LOG_DEBUG("%s: current_state(%p) mode(%d)\n", __func__, current_state, LINK_ENC_CFG_TRANSIENT);
760 }
761}
762

source code of linux/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c