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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright 2018 Noralf Trønnes
4 * Copyright (c) 2006-2009 Red Hat Inc.
5 * Copyright (c) 2006-2008 Intel Corporation
6 * Jesse Barnes <jesse.barnes@intel.com>
7 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
8 */
9
10#include "drm/drm_modeset_lock.h"
11#include <linux/module.h>
12#include <linux/mutex.h>
13#include <linux/slab.h>
14#include <linux/string_helpers.h>
15
16#include <drm/drm_atomic.h>
17#include <drm/drm_client.h>
18#include <drm/drm_connector.h>
19#include <drm/drm_crtc.h>
20#include <drm/drm_device.h>
21#include <drm/drm_drv.h>
22#include <drm/drm_edid.h>
23#include <drm/drm_encoder.h>
24#include <drm/drm_print.h>
25
26#include "drm_crtc_internal.h"
27#include "drm_internal.h"
28
29#define DRM_CLIENT_MAX_CLONED_CONNECTORS 8
30
31struct drm_client_offset {
32 int x, y;
33};
34
35int drm_client_modeset_create(struct drm_client_dev *client)
36{
37 struct drm_device *dev = client->dev;
38 unsigned int num_crtc = dev->mode_config.num_crtc;
39 unsigned int max_connector_count = 1;
40 struct drm_mode_set *modeset;
41 struct drm_crtc *crtc;
42 unsigned int i = 0;
43
44 /* Add terminating zero entry to enable index less iteration */
45 client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
46 if (!client->modesets)
47 return -ENOMEM;
48
49 mutex_init(&client->modeset_mutex);
50
51 drm_for_each_crtc(crtc, dev)
52 client->modesets[i++].crtc = crtc;
53
54 /* Cloning is only supported in the single crtc case. */
55 if (num_crtc == 1)
56 max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
57
58 for (modeset = client->modesets; modeset->crtc; modeset++) {
59 modeset->connectors = kcalloc(max_connector_count,
60 sizeof(*modeset->connectors), GFP_KERNEL);
61 if (!modeset->connectors)
62 goto err_free;
63 }
64
65 return 0;
66
67err_free:
68 drm_client_modeset_free(client);
69
70 return -ENOMEM;
71}
72
73static void drm_client_modeset_release(struct drm_client_dev *client)
74{
75 struct drm_mode_set *modeset;
76 unsigned int i;
77
78 drm_client_for_each_modeset(modeset, client) {
79 drm_mode_destroy(client->dev, modeset->mode);
80 modeset->mode = NULL;
81 modeset->fb = NULL;
82
83 for (i = 0; i < modeset->num_connectors; i++) {
84 drm_connector_put(modeset->connectors[i]);
85 modeset->connectors[i] = NULL;
86 }
87 modeset->num_connectors = 0;
88 }
89}
90
91void drm_client_modeset_free(struct drm_client_dev *client)
92{
93 struct drm_mode_set *modeset;
94
95 mutex_lock(&client->modeset_mutex);
96
97 drm_client_modeset_release(client);
98
99 drm_client_for_each_modeset(modeset, client)
100 kfree(modeset->connectors);
101
102 mutex_unlock(&client->modeset_mutex);
103
104 mutex_destroy(&client->modeset_mutex);
105 kfree(client->modesets);
106}
107
108static struct drm_mode_set *
109drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
110{
111 struct drm_mode_set *modeset;
112
113 drm_client_for_each_modeset(modeset, client)
114 if (modeset->crtc == crtc)
115 return modeset;
116
117 return NULL;
118}
119
120static struct drm_display_mode *
121drm_connector_get_tiled_mode(struct drm_connector *connector)
122{
123 struct drm_display_mode *mode;
124
125 list_for_each_entry(mode, &connector->modes, head) {
126 if (mode->hdisplay == connector->tile_h_size &&
127 mode->vdisplay == connector->tile_v_size)
128 return mode;
129 }
130 return NULL;
131}
132
133static struct drm_display_mode *
134drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
135{
136 struct drm_display_mode *mode;
137
138 list_for_each_entry(mode, &connector->modes, head) {
139 if (mode->hdisplay == connector->tile_h_size &&
140 mode->vdisplay == connector->tile_v_size)
141 continue;
142 return mode;
143 }
144 return NULL;
145}
146
147static struct drm_display_mode *
148drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
149{
150 struct drm_display_mode *mode;
151
152 list_for_each_entry(mode, &connector->modes, head) {
153 if (mode->hdisplay > width ||
154 mode->vdisplay > height)
155 continue;
156 if (mode->type & DRM_MODE_TYPE_PREFERRED)
157 return mode;
158 }
159 return NULL;
160}
161
162static struct drm_display_mode *drm_connector_pick_cmdline_mode(struct drm_connector *connector)
163{
164 struct drm_cmdline_mode *cmdline_mode;
165 struct drm_display_mode *mode;
166 bool prefer_non_interlace;
167
168 /*
169 * Find a user-defined mode. If the user gave us a valid
170 * mode on the kernel command line, it will show up in this
171 * list.
172 */
173
174 list_for_each_entry(mode, &connector->modes, head) {
175 if (mode->type & DRM_MODE_TYPE_USERDEF)
176 return mode;
177 }
178
179 cmdline_mode = &connector->cmdline_mode;
180 if (cmdline_mode->specified == false)
181 return NULL;
182
183 /*
184 * Attempt to find a matching mode in the list of modes we
185 * have gotten so far.
186 */
187
188 prefer_non_interlace = !cmdline_mode->interlace;
189again:
190 list_for_each_entry(mode, &connector->modes, head) {
191 /* Check (optional) mode name first */
192 if (!strcmp(mode->name, cmdline_mode->name))
193 return mode;
194
195 /* check width/height */
196 if (mode->hdisplay != cmdline_mode->xres ||
197 mode->vdisplay != cmdline_mode->yres)
198 continue;
199
200 if (cmdline_mode->refresh_specified) {
201 if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
202 continue;
203 }
204
205 if (cmdline_mode->interlace) {
206 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
207 continue;
208 } else if (prefer_non_interlace) {
209 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
210 continue;
211 }
212 return mode;
213 }
214
215 if (prefer_non_interlace) {
216 prefer_non_interlace = false;
217 goto again;
218 }
219
220 return NULL;
221}
222
223static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
224{
225 bool enable;
226
227 if (connector->display_info.non_desktop)
228 return false;
229
230 if (strict)
231 enable = connector->status == connector_status_connected;
232 else
233 enable = connector->status != connector_status_disconnected;
234
235 return enable;
236}
237
238static void drm_client_connectors_enabled(struct drm_connector **connectors,
239 unsigned int connector_count,
240 bool *enabled)
241{
242 bool any_enabled = false;
243 struct drm_connector *connector;
244 int i = 0;
245
246 for (i = 0; i < connector_count; i++) {
247 connector = connectors[i];
248 enabled[i] = drm_connector_enabled(connector, true);
249 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
250 connector->display_info.non_desktop ? "non desktop" : str_yes_no(enabled[i]));
251
252 any_enabled |= enabled[i];
253 }
254
255 if (any_enabled)
256 return;
257
258 for (i = 0; i < connector_count; i++)
259 enabled[i] = drm_connector_enabled(connectors[i], false);
260}
261
262static bool drm_client_target_cloned(struct drm_device *dev,
263 struct drm_connector **connectors,
264 unsigned int connector_count,
265 struct drm_display_mode **modes,
266 struct drm_client_offset *offsets,
267 bool *enabled, int width, int height)
268{
269 int count, i, j;
270 bool can_clone = false;
271 struct drm_display_mode *dmt_mode, *mode;
272
273 /* only contemplate cloning in the single crtc case */
274 if (dev->mode_config.num_crtc > 1)
275 return false;
276
277 count = 0;
278 for (i = 0; i < connector_count; i++) {
279 if (enabled[i])
280 count++;
281 }
282
283 /* only contemplate cloning if more than one connector is enabled */
284 if (count <= 1)
285 return false;
286
287 /* check the command line or if nothing common pick 1024x768 */
288 can_clone = true;
289 for (i = 0; i < connector_count; i++) {
290 if (!enabled[i])
291 continue;
292 modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
293 if (!modes[i]) {
294 can_clone = false;
295 break;
296 }
297 for (j = 0; j < i; j++) {
298 if (!enabled[j])
299 continue;
300 if (!drm_mode_match(modes[j], modes[i],
301 DRM_MODE_MATCH_TIMINGS |
302 DRM_MODE_MATCH_CLOCK |
303 DRM_MODE_MATCH_FLAGS |
304 DRM_MODE_MATCH_3D_FLAGS))
305 can_clone = false;
306 }
307 }
308
309 if (can_clone) {
310 DRM_DEBUG_KMS("can clone using command line\n");
311 return true;
312 }
313
314 /* try and find a 1024x768 mode on each connector */
315 can_clone = true;
316 dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
317
318 for (i = 0; i < connector_count; i++) {
319 if (!enabled[i])
320 continue;
321
322 list_for_each_entry(mode, &connectors[i]->modes, head) {
323 if (drm_mode_match(mode, dmt_mode,
324 DRM_MODE_MATCH_TIMINGS |
325 DRM_MODE_MATCH_CLOCK |
326 DRM_MODE_MATCH_FLAGS |
327 DRM_MODE_MATCH_3D_FLAGS))
328 modes[i] = mode;
329 }
330 if (!modes[i])
331 can_clone = false;
332 }
333
334 if (can_clone) {
335 DRM_DEBUG_KMS("can clone using 1024x768\n");
336 return true;
337 }
338 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
339 return false;
340}
341
342static int drm_client_get_tile_offsets(struct drm_connector **connectors,
343 unsigned int connector_count,
344 struct drm_display_mode **modes,
345 struct drm_client_offset *offsets,
346 int idx,
347 int h_idx, int v_idx)
348{
349 struct drm_connector *connector;
350 int i;
351 int hoffset = 0, voffset = 0;
352
353 for (i = 0; i < connector_count; i++) {
354 connector = connectors[i];
355 if (!connector->has_tile)
356 continue;
357
358 if (!modes[i] && (h_idx || v_idx)) {
359 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
360 connector->base.id);
361 continue;
362 }
363 if (connector->tile_h_loc < h_idx)
364 hoffset += modes[i]->hdisplay;
365
366 if (connector->tile_v_loc < v_idx)
367 voffset += modes[i]->vdisplay;
368 }
369 offsets[idx].x = hoffset;
370 offsets[idx].y = voffset;
371 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
372 return 0;
373}
374
375static bool drm_client_target_preferred(struct drm_connector **connectors,
376 unsigned int connector_count,
377 struct drm_display_mode **modes,
378 struct drm_client_offset *offsets,
379 bool *enabled, int width, int height)
380{
381 const u64 mask = BIT_ULL(connector_count) - 1;
382 struct drm_connector *connector;
383 u64 conn_configured = 0;
384 int tile_pass = 0;
385 int num_tiled_conns = 0;
386 int i;
387
388 for (i = 0; i < connector_count; i++) {
389 if (connectors[i]->has_tile &&
390 connectors[i]->status == connector_status_connected)
391 num_tiled_conns++;
392 }
393
394retry:
395 for (i = 0; i < connector_count; i++) {
396 connector = connectors[i];
397
398 if (conn_configured & BIT_ULL(i))
399 continue;
400
401 if (enabled[i] == false) {
402 conn_configured |= BIT_ULL(i);
403 continue;
404 }
405
406 /* first pass over all the untiled connectors */
407 if (tile_pass == 0 && connector->has_tile)
408 continue;
409
410 if (tile_pass == 1) {
411 if (connector->tile_h_loc != 0 ||
412 connector->tile_v_loc != 0)
413 continue;
414
415 } else {
416 if (connector->tile_h_loc != tile_pass - 1 &&
417 connector->tile_v_loc != tile_pass - 1)
418 /* if this tile_pass doesn't cover any of the tiles - keep going */
419 continue;
420
421 /*
422 * find the tile offsets for this pass - need to find
423 * all tiles left and above
424 */
425 drm_client_get_tile_offsets(connectors, connector_count, modes, offsets, i,
426 connector->tile_h_loc, connector->tile_v_loc);
427 }
428 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
429 connector->base.id);
430
431 /* got for command line mode first */
432 modes[i] = drm_connector_pick_cmdline_mode(connector);
433 if (!modes[i]) {
434 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
435 connector->base.id, connector->tile_group ? connector->tile_group->id : 0);
436 modes[i] = drm_connector_has_preferred_mode(connector, width, height);
437 }
438 /* No preferred modes, pick one off the list */
439 if (!modes[i] && !list_empty(&connector->modes)) {
440 list_for_each_entry(modes[i], &connector->modes, head)
441 break;
442 }
443 /*
444 * In case of tiled mode if all tiles not present fallback to
445 * first available non tiled mode.
446 * After all tiles are present, try to find the tiled mode
447 * for all and if tiled mode not present due to fbcon size
448 * limitations, use first non tiled mode only for
449 * tile 0,0 and set to no mode for all other tiles.
450 */
451 if (connector->has_tile) {
452 if (num_tiled_conns <
453 connector->num_h_tile * connector->num_v_tile ||
454 (connector->tile_h_loc == 0 &&
455 connector->tile_v_loc == 0 &&
456 !drm_connector_get_tiled_mode(connector))) {
457 DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
458 connector->base.id);
459 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
460 } else {
461 modes[i] = drm_connector_get_tiled_mode(connector);
462 }
463 }
464
465 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
466 "none");
467 conn_configured |= BIT_ULL(i);
468 }
469
470 if ((conn_configured & mask) != mask) {
471 tile_pass++;
472 goto retry;
473 }
474 return true;
475}
476
477static bool connector_has_possible_crtc(struct drm_connector *connector,
478 struct drm_crtc *crtc)
479{
480 struct drm_encoder *encoder;
481
482 drm_connector_for_each_possible_encoder(connector, encoder) {
483 if (encoder->possible_crtcs & drm_crtc_mask(crtc))
484 return true;
485 }
486
487 return false;
488}
489
490static int drm_client_pick_crtcs(struct drm_client_dev *client,
491 struct drm_connector **connectors,
492 unsigned int connector_count,
493 struct drm_crtc **best_crtcs,
494 struct drm_display_mode **modes,
495 int n, int width, int height)
496{
497 struct drm_device *dev = client->dev;
498 struct drm_connector *connector;
499 int my_score, best_score, score;
500 struct drm_crtc **crtcs, *crtc;
501 struct drm_mode_set *modeset;
502 int o;
503
504 if (n == connector_count)
505 return 0;
506
507 connector = connectors[n];
508
509 best_crtcs[n] = NULL;
510 best_score = drm_client_pick_crtcs(client, connectors, connector_count,
511 best_crtcs, modes, n + 1, width, height);
512 if (modes[n] == NULL)
513 return best_score;
514
515 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
516 if (!crtcs)
517 return best_score;
518
519 my_score = 1;
520 if (connector->status == connector_status_connected)
521 my_score++;
522 if (connector->cmdline_mode.specified)
523 my_score++;
524 if (drm_connector_has_preferred_mode(connector, width, height))
525 my_score++;
526
527 /*
528 * select a crtc for this connector and then attempt to configure
529 * remaining connectors
530 */
531 drm_client_for_each_modeset(modeset, client) {
532 crtc = modeset->crtc;
533
534 if (!connector_has_possible_crtc(connector, crtc))
535 continue;
536
537 for (o = 0; o < n; o++)
538 if (best_crtcs[o] == crtc)
539 break;
540
541 if (o < n) {
542 /* ignore cloning unless only a single crtc */
543 if (dev->mode_config.num_crtc > 1)
544 continue;
545
546 if (!drm_mode_equal(modes[o], modes[n]))
547 continue;
548 }
549
550 crtcs[n] = crtc;
551 memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
552 score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
553 crtcs, modes, n + 1, width, height);
554 if (score > best_score) {
555 best_score = score;
556 memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
557 }
558 }
559
560 kfree(crtcs);
561 return best_score;
562}
563
564/* Try to read the BIOS display configuration and use it for the initial config */
565static bool drm_client_firmware_config(struct drm_client_dev *client,
566 struct drm_connector **connectors,
567 unsigned int connector_count,
568 struct drm_crtc **crtcs,
569 struct drm_display_mode **modes,
570 struct drm_client_offset *offsets,
571 bool *enabled, int width, int height)
572{
573 const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
574 unsigned long conn_configured, conn_seq, mask;
575 struct drm_device *dev = client->dev;
576 int i, j;
577 bool *save_enabled;
578 bool fallback = true, ret = true;
579 int num_connectors_enabled = 0;
580 int num_connectors_detected = 0;
581 int num_tiled_conns = 0;
582 struct drm_modeset_acquire_ctx ctx;
583
584 if (!drm_drv_uses_atomic_modeset(dev))
585 return false;
586
587 if (WARN_ON(count <= 0))
588 return false;
589
590 save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
591 if (!save_enabled)
592 return false;
593
594 drm_modeset_acquire_init(&ctx, 0);
595
596 while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
597 drm_modeset_backoff(&ctx);
598
599 memcpy(save_enabled, enabled, count);
600 mask = GENMASK(count - 1, 0);
601 conn_configured = 0;
602 for (i = 0; i < count; i++) {
603 if (connectors[i]->has_tile &&
604 connectors[i]->status == connector_status_connected)
605 num_tiled_conns++;
606 }
607retry:
608 conn_seq = conn_configured;
609 for (i = 0; i < count; i++) {
610 struct drm_connector *connector;
611 struct drm_encoder *encoder;
612 struct drm_crtc *new_crtc;
613
614 connector = connectors[i];
615
616 if (conn_configured & BIT(i))
617 continue;
618
619 if (conn_seq == 0 && !connector->has_tile)
620 continue;
621
622 if (connector->status == connector_status_connected)
623 num_connectors_detected++;
624
625 if (!enabled[i]) {
626 DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
627 connector->name);
628 conn_configured |= BIT(i);
629 continue;
630 }
631
632 if (connector->force == DRM_FORCE_OFF) {
633 DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
634 connector->name);
635 enabled[i] = false;
636 continue;
637 }
638
639 encoder = connector->state->best_encoder;
640 if (!encoder || WARN_ON(!connector->state->crtc)) {
641 if (connector->force > DRM_FORCE_OFF)
642 goto bail;
643
644 DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
645 connector->name);
646 enabled[i] = false;
647 conn_configured |= BIT(i);
648 continue;
649 }
650
651 num_connectors_enabled++;
652
653 new_crtc = connector->state->crtc;
654
655 /*
656 * Make sure we're not trying to drive multiple connectors
657 * with a single CRTC, since our cloning support may not
658 * match the BIOS.
659 */
660 for (j = 0; j < count; j++) {
661 if (crtcs[j] == new_crtc) {
662 DRM_DEBUG_KMS("fallback: cloned configuration\n");
663 goto bail;
664 }
665 }
666
667 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
668 connector->name);
669
670 /* go for command line mode first */
671 modes[i] = drm_connector_pick_cmdline_mode(connector);
672
673 /* try for preferred next */
674 if (!modes[i]) {
675 DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
676 connector->name, connector->has_tile);
677 modes[i] = drm_connector_has_preferred_mode(connector, width, height);
678 }
679
680 /* No preferred mode marked by the EDID? Are there any modes? */
681 if (!modes[i] && !list_empty(&connector->modes)) {
682 DRM_DEBUG_KMS("using first mode listed on connector %s\n",
683 connector->name);
684 modes[i] = list_first_entry(&connector->modes,
685 struct drm_display_mode,
686 head);
687 }
688
689 /* last resort: use current mode */
690 if (!modes[i]) {
691 /*
692 * IMPORTANT: We want to use the adjusted mode (i.e.
693 * after the panel fitter upscaling) as the initial
694 * config, not the input mode, which is what crtc->mode
695 * usually contains. But since our current
696 * code puts a mode derived from the post-pfit timings
697 * into crtc->mode this works out correctly.
698 *
699 * This is crtc->mode and not crtc->state->mode for the
700 * fastboot check to work correctly.
701 */
702 DRM_DEBUG_KMS("looking for current mode on connector %s\n",
703 connector->name);
704 modes[i] = &connector->state->crtc->mode;
705 }
706 /*
707 * In case of tiled modes, if all tiles are not present
708 * then fallback to a non tiled mode.
709 */
710 if (connector->has_tile &&
711 num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
712 DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
713 connector->base.id);
714 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
715 }
716 crtcs[i] = new_crtc;
717
718 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
719 connector->name,
720 connector->state->crtc->base.id,
721 connector->state->crtc->name,
722 modes[i]->hdisplay, modes[i]->vdisplay,
723 modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
724
725 fallback = false;
726 conn_configured |= BIT(i);
727 }
728
729 if ((conn_configured & mask) != mask && conn_configured != conn_seq)
730 goto retry;
731
732 /*
733 * If the BIOS didn't enable everything it could, fall back to have the
734 * same user experiencing of lighting up as much as possible like the
735 * fbdev helper library.
736 */
737 if (num_connectors_enabled != num_connectors_detected &&
738 num_connectors_enabled < dev->mode_config.num_crtc) {
739 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
740 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
741 num_connectors_detected);
742 fallback = true;
743 }
744
745 if (fallback) {
746bail:
747 DRM_DEBUG_KMS("Not using firmware configuration\n");
748 memcpy(enabled, save_enabled, count);
749 ret = false;
750 }
751
752 drm_modeset_drop_locks(&ctx);
753 drm_modeset_acquire_fini(&ctx);
754
755 kfree(save_enabled);
756 return ret;
757}
758
759/**
760 * drm_client_modeset_probe() - Probe for displays
761 * @client: DRM client
762 * @width: Maximum display mode width (optional)
763 * @height: Maximum display mode height (optional)
764 *
765 * This function sets up display pipelines for enabled connectors and stores the
766 * config in the client's modeset array.
767 *
768 * Returns:
769 * Zero on success or negative error code on failure.
770 */
771int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
772{
773 struct drm_connector *connector, **connectors = NULL;
774 struct drm_connector_list_iter conn_iter;
775 struct drm_device *dev = client->dev;
776 unsigned int total_modes_count = 0;
777 struct drm_client_offset *offsets;
778 unsigned int connector_count = 0;
779 struct drm_display_mode **modes;
780 struct drm_crtc **crtcs;
781 int i, ret = 0;
782 bool *enabled;
783
784 DRM_DEBUG_KMS("\n");
785
786 if (!width)
787 width = dev->mode_config.max_width;
788 if (!height)
789 height = dev->mode_config.max_height;
790
791 drm_connector_list_iter_begin(dev, &conn_iter);
792 drm_client_for_each_connector_iter(connector, &conn_iter) {
793 struct drm_connector **tmp;
794
795 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
796 if (!tmp) {
797 ret = -ENOMEM;
798 goto free_connectors;
799 }
800
801 connectors = tmp;
802 drm_connector_get(connector);
803 connectors[connector_count++] = connector;
804 }
805 drm_connector_list_iter_end(&conn_iter);
806
807 if (!connector_count)
808 return 0;
809
810 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
811 modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
812 offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
813 enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
814 if (!crtcs || !modes || !enabled || !offsets) {
815 DRM_ERROR("Memory allocation failed\n");
816 ret = -ENOMEM;
817 goto out;
818 }
819
820 mutex_lock(&client->modeset_mutex);
821
822 mutex_lock(&dev->mode_config.mutex);
823 for (i = 0; i < connector_count; i++)
824 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
825 if (!total_modes_count)
826 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
827 drm_client_connectors_enabled(connectors, connector_count, enabled);
828
829 if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
830 modes, offsets, enabled, width, height)) {
831 memset(modes, 0, connector_count * sizeof(*modes));
832 memset(crtcs, 0, connector_count * sizeof(*crtcs));
833 memset(offsets, 0, connector_count * sizeof(*offsets));
834
835 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
836 offsets, enabled, width, height) &&
837 !drm_client_target_preferred(connectors, connector_count, modes,
838 offsets, enabled, width, height))
839 DRM_ERROR("Unable to find initial modes\n");
840
841 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
842 width, height);
843
844 drm_client_pick_crtcs(client, connectors, connector_count,
845 crtcs, modes, 0, width, height);
846 }
847 mutex_unlock(&dev->mode_config.mutex);
848
849 drm_client_modeset_release(client);
850
851 for (i = 0; i < connector_count; i++) {
852 struct drm_display_mode *mode = modes[i];
853 struct drm_crtc *crtc = crtcs[i];
854 struct drm_client_offset *offset = &offsets[i];
855
856 if (mode && crtc) {
857 struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
858 struct drm_connector *connector = connectors[i];
859
860 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
861 mode->name, crtc->base.id, offset->x, offset->y);
862
863 if (WARN_ON_ONCE(modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
864 (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
865 ret = -EINVAL;
866 break;
867 }
868
869 modeset->mode = drm_mode_duplicate(dev, mode);
870 drm_connector_get(connector);
871 modeset->connectors[modeset->num_connectors++] = connector;
872 modeset->x = offset->x;
873 modeset->y = offset->y;
874 }
875 }
876
877 mutex_unlock(&client->modeset_mutex);
878out:
879 kfree(crtcs);
880 kfree(modes);
881 kfree(offsets);
882 kfree(enabled);
883free_connectors:
884 for (i = 0; i < connector_count; i++)
885 drm_connector_put(connectors[i]);
886 kfree(connectors);
887
888 return ret;
889}
890EXPORT_SYMBOL(drm_client_modeset_probe);
891
892/**
893 * drm_client_rotation() - Check the initial rotation value
894 * @modeset: DRM modeset
895 * @rotation: Returned rotation value
896 *
897 * This function checks if the primary plane in @modeset can hw rotate
898 * to match the rotation needed on its connector.
899 *
900 * Note: Currently only 0 and 180 degrees are supported.
901 *
902 * Return:
903 * True if the plane can do the rotation, false otherwise.
904 */
905bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
906{
907 struct drm_connector *connector = modeset->connectors[0];
908 struct drm_plane *plane = modeset->crtc->primary;
909 struct drm_cmdline_mode *cmdline;
910 u64 valid_mask = 0;
911 unsigned int i;
912
913 if (!modeset->num_connectors)
914 return false;
915
916 switch (connector->display_info.panel_orientation) {
917 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
918 *rotation = DRM_MODE_ROTATE_180;
919 break;
920 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
921 *rotation = DRM_MODE_ROTATE_90;
922 break;
923 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
924 *rotation = DRM_MODE_ROTATE_270;
925 break;
926 default:
927 *rotation = DRM_MODE_ROTATE_0;
928 }
929
930 /**
931 * The panel already defined the default rotation
932 * through its orientation. Whatever has been provided
933 * on the command line needs to be added to that.
934 *
935 * Unfortunately, the rotations are at different bit
936 * indices, so the math to add them up are not as
937 * trivial as they could.
938 *
939 * Reflections on the other hand are pretty trivial to deal with, a
940 * simple XOR between the two handle the addition nicely.
941 */
942 cmdline = &connector->cmdline_mode;
943 if (cmdline->specified && cmdline->rotation_reflection) {
944 unsigned int cmdline_rest, panel_rest;
945 unsigned int cmdline_rot, panel_rot;
946 unsigned int sum_rot, sum_rest;
947
948 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
949 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
950 sum_rot = (panel_rot + cmdline_rot) % 4;
951
952 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
953 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
954 sum_rest = panel_rest ^ cmdline_rest;
955
956 *rotation = (1 << sum_rot) | sum_rest;
957 }
958
959 /*
960 * TODO: support 90 / 270 degree hardware rotation,
961 * depending on the hardware this may require the framebuffer
962 * to be in a specific tiling format.
963 */
964 if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
965 (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
966 !plane->rotation_property)
967 return false;
968
969 for (i = 0; i < plane->rotation_property->num_values; i++)
970 valid_mask |= (1ULL << plane->rotation_property->values[i]);
971
972 if (!(*rotation & valid_mask))
973 return false;
974
975 return true;
976}
977EXPORT_SYMBOL(drm_client_rotation);
978
979static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
980{
981 struct drm_device *dev = client->dev;
982 struct drm_plane *plane;
983 struct drm_atomic_state *state;
984 struct drm_modeset_acquire_ctx ctx;
985 struct drm_mode_set *mode_set;
986 int ret;
987
988 drm_modeset_acquire_init(&ctx, 0);
989
990 state = drm_atomic_state_alloc(dev);
991 if (!state) {
992 ret = -ENOMEM;
993 goto out_ctx;
994 }
995
996 state->acquire_ctx = &ctx;
997retry:
998 drm_for_each_plane(plane, dev) {
999 struct drm_plane_state *plane_state;
1000
1001 plane_state = drm_atomic_get_plane_state(state, plane);
1002 if (IS_ERR(plane_state)) {
1003 ret = PTR_ERR(plane_state);
1004 goto out_state;
1005 }
1006
1007 plane_state->rotation = DRM_MODE_ROTATE_0;
1008
1009 /* disable non-primary: */
1010 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1011 continue;
1012
1013 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1014 if (ret != 0)
1015 goto out_state;
1016 }
1017
1018 drm_client_for_each_modeset(mode_set, client) {
1019 struct drm_plane *primary = mode_set->crtc->primary;
1020 unsigned int rotation;
1021
1022 if (drm_client_rotation(mode_set, &rotation)) {
1023 struct drm_plane_state *plane_state;
1024
1025 /* Cannot fail as we've already gotten the plane state above */
1026 plane_state = drm_atomic_get_new_plane_state(state, primary);
1027 plane_state->rotation = rotation;
1028 }
1029
1030 ret = __drm_atomic_helper_set_config(mode_set, state);
1031 if (ret != 0)
1032 goto out_state;
1033
1034 /*
1035 * __drm_atomic_helper_set_config() sets active when a
1036 * mode is set, unconditionally clear it if we force DPMS off
1037 */
1038 if (!active) {
1039 struct drm_crtc *crtc = mode_set->crtc;
1040 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1041
1042 crtc_state->active = false;
1043 }
1044 }
1045
1046 if (check)
1047 ret = drm_atomic_check_only(state);
1048 else
1049 ret = drm_atomic_commit(state);
1050
1051out_state:
1052 if (ret == -EDEADLK)
1053 goto backoff;
1054
1055 drm_atomic_state_put(state);
1056out_ctx:
1057 drm_modeset_drop_locks(&ctx);
1058 drm_modeset_acquire_fini(&ctx);
1059
1060 return ret;
1061
1062backoff:
1063 drm_atomic_state_clear(state);
1064 drm_modeset_backoff(&ctx);
1065
1066 goto retry;
1067}
1068
1069static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1070{
1071 struct drm_device *dev = client->dev;
1072 struct drm_mode_set *mode_set;
1073 struct drm_plane *plane;
1074 int ret = 0;
1075
1076 drm_modeset_lock_all(dev);
1077 drm_for_each_plane(plane, dev) {
1078 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1079 drm_plane_force_disable(plane);
1080
1081 if (plane->rotation_property)
1082 drm_mode_plane_set_obj_prop(plane,
1083 plane->rotation_property,
1084 DRM_MODE_ROTATE_0);
1085 }
1086
1087 drm_client_for_each_modeset(mode_set, client) {
1088 struct drm_crtc *crtc = mode_set->crtc;
1089
1090 if (crtc->funcs->cursor_set2) {
1091 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1092 if (ret)
1093 goto out;
1094 } else if (crtc->funcs->cursor_set) {
1095 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1096 if (ret)
1097 goto out;
1098 }
1099
1100 ret = drm_mode_set_config_internal(mode_set);
1101 if (ret)
1102 goto out;
1103 }
1104out:
1105 drm_modeset_unlock_all(dev);
1106
1107 return ret;
1108}
1109
1110/**
1111 * drm_client_modeset_check() - Check modeset configuration
1112 * @client: DRM client
1113 *
1114 * Check modeset configuration.
1115 *
1116 * Returns:
1117 * Zero on success or negative error code on failure.
1118 */
1119int drm_client_modeset_check(struct drm_client_dev *client)
1120{
1121 int ret;
1122
1123 if (!drm_drv_uses_atomic_modeset(client->dev))
1124 return 0;
1125
1126 mutex_lock(&client->modeset_mutex);
1127 ret = drm_client_modeset_commit_atomic(client, true, true);
1128 mutex_unlock(&client->modeset_mutex);
1129
1130 return ret;
1131}
1132EXPORT_SYMBOL(drm_client_modeset_check);
1133
1134/**
1135 * drm_client_modeset_commit_locked() - Force commit CRTC configuration
1136 * @client: DRM client
1137 *
1138 * Commit modeset configuration to crtcs without checking if there is a DRM
1139 * master. The assumption is that the caller already holds an internal DRM
1140 * master reference acquired with drm_master_internal_acquire().
1141 *
1142 * Returns:
1143 * Zero on success or negative error code on failure.
1144 */
1145int drm_client_modeset_commit_locked(struct drm_client_dev *client)
1146{
1147 struct drm_device *dev = client->dev;
1148 int ret;
1149
1150 mutex_lock(&client->modeset_mutex);
1151 if (drm_drv_uses_atomic_modeset(dev))
1152 ret = drm_client_modeset_commit_atomic(client, true, false);
1153 else
1154 ret = drm_client_modeset_commit_legacy(client);
1155 mutex_unlock(&client->modeset_mutex);
1156
1157 return ret;
1158}
1159EXPORT_SYMBOL(drm_client_modeset_commit_locked);
1160
1161/**
1162 * drm_client_modeset_commit() - Commit CRTC configuration
1163 * @client: DRM client
1164 *
1165 * Commit modeset configuration to crtcs.
1166 *
1167 * Returns:
1168 * Zero on success or negative error code on failure.
1169 */
1170int drm_client_modeset_commit(struct drm_client_dev *client)
1171{
1172 struct drm_device *dev = client->dev;
1173 int ret;
1174
1175 if (!drm_master_internal_acquire(dev))
1176 return -EBUSY;
1177
1178 ret = drm_client_modeset_commit_locked(client);
1179
1180 drm_master_internal_release(dev);
1181
1182 return ret;
1183}
1184EXPORT_SYMBOL(drm_client_modeset_commit);
1185
1186static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1187{
1188 struct drm_device *dev = client->dev;
1189 struct drm_connector *connector;
1190 struct drm_mode_set *modeset;
1191 struct drm_modeset_acquire_ctx ctx;
1192 int j;
1193 int ret;
1194
1195 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
1196 drm_client_for_each_modeset(modeset, client) {
1197 if (!modeset->crtc->enabled)
1198 continue;
1199
1200 for (j = 0; j < modeset->num_connectors; j++) {
1201 connector = modeset->connectors[j];
1202 connector->funcs->dpms(connector, dpms_mode);
1203 drm_object_property_set_value(&connector->base,
1204 dev->mode_config.dpms_property, dpms_mode);
1205 }
1206 }
1207 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
1208}
1209
1210/**
1211 * drm_client_modeset_dpms() - Set DPMS mode
1212 * @client: DRM client
1213 * @mode: DPMS mode
1214 *
1215 * Note: For atomic drivers @mode is reduced to on/off.
1216 *
1217 * Returns:
1218 * Zero on success or negative error code on failure.
1219 */
1220int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1221{
1222 struct drm_device *dev = client->dev;
1223 int ret = 0;
1224
1225 if (!drm_master_internal_acquire(dev))
1226 return -EBUSY;
1227
1228 mutex_lock(&client->modeset_mutex);
1229 if (drm_drv_uses_atomic_modeset(dev))
1230 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
1231 else
1232 drm_client_modeset_dpms_legacy(client, mode);
1233 mutex_unlock(&client->modeset_mutex);
1234
1235 drm_master_internal_release(dev);
1236
1237 return ret;
1238}
1239EXPORT_SYMBOL(drm_client_modeset_dpms);
1240
1241#ifdef CONFIG_DRM_KUNIT_TEST
1242#include "tests/drm_client_modeset_test.c"
1243#endif