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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 width/height */
192 if (mode->hdisplay != cmdline_mode->xres ||
193 mode->vdisplay != cmdline_mode->yres)
194 continue;
195
196 if (cmdline_mode->refresh_specified) {
197 if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
198 continue;
199 }
200
201 if (cmdline_mode->interlace) {
202 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
203 continue;
204 } else if (prefer_non_interlace) {
205 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
206 continue;
207 }
208 return mode;
209 }
210
211 if (prefer_non_interlace) {
212 prefer_non_interlace = false;
213 goto again;
214 }
215
216 return NULL;
217}
218
219static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
220{
221 bool enable;
222
223 if (connector->display_info.non_desktop)
224 return false;
225
226 if (strict)
227 enable = connector->status == connector_status_connected;
228 else
229 enable = connector->status != connector_status_disconnected;
230
231 return enable;
232}
233
234static void drm_client_connectors_enabled(struct drm_connector **connectors,
235 unsigned int connector_count,
236 bool *enabled)
237{
238 bool any_enabled = false;
239 struct drm_connector *connector;
240 int i = 0;
241
242 for (i = 0; i < connector_count; i++) {
243 connector = connectors[i];
244 enabled[i] = drm_connector_enabled(connector, true);
245 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
246 connector->display_info.non_desktop ? "non desktop" : str_yes_no(enabled[i]));
247
248 any_enabled |= enabled[i];
249 }
250
251 if (any_enabled)
252 return;
253
254 for (i = 0; i < connector_count; i++)
255 enabled[i] = drm_connector_enabled(connectors[i], false);
256}
257
258static bool drm_client_target_cloned(struct drm_device *dev,
259 struct drm_connector **connectors,
260 unsigned int connector_count,
261 struct drm_display_mode **modes,
262 struct drm_client_offset *offsets,
263 bool *enabled, int width, int height)
264{
265 int count, i, j;
266 bool can_clone = false;
267 struct drm_display_mode *dmt_mode, *mode;
268
269 /* only contemplate cloning in the single crtc case */
270 if (dev->mode_config.num_crtc > 1)
271 return false;
272
273 count = 0;
274 for (i = 0; i < connector_count; i++) {
275 if (enabled[i])
276 count++;
277 }
278
279 /* only contemplate cloning if more than one connector is enabled */
280 if (count <= 1)
281 return false;
282
283 /* check the command line or if nothing common pick 1024x768 */
284 can_clone = true;
285 for (i = 0; i < connector_count; i++) {
286 if (!enabled[i])
287 continue;
288 modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
289 if (!modes[i]) {
290 can_clone = false;
291 break;
292 }
293 for (j = 0; j < i; j++) {
294 if (!enabled[j])
295 continue;
296 if (!drm_mode_match(modes[j], modes[i],
297 DRM_MODE_MATCH_TIMINGS |
298 DRM_MODE_MATCH_CLOCK |
299 DRM_MODE_MATCH_FLAGS |
300 DRM_MODE_MATCH_3D_FLAGS))
301 can_clone = false;
302 }
303 }
304
305 if (can_clone) {
306 DRM_DEBUG_KMS("can clone using command line\n");
307 return true;
308 }
309
310 /* try and find a 1024x768 mode on each connector */
311 can_clone = true;
312 dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
313
314 if (!dmt_mode)
315 goto fail;
316
317 for (i = 0; i < connector_count; i++) {
318 if (!enabled[i])
319 continue;
320
321 list_for_each_entry(mode, &connectors[i]->modes, head) {
322 if (drm_mode_match(mode, dmt_mode,
323 DRM_MODE_MATCH_TIMINGS |
324 DRM_MODE_MATCH_CLOCK |
325 DRM_MODE_MATCH_FLAGS |
326 DRM_MODE_MATCH_3D_FLAGS))
327 modes[i] = mode;
328 }
329 if (!modes[i])
330 can_clone = false;
331 }
332 kfree(dmt_mode);
333
334 if (can_clone) {
335 DRM_DEBUG_KMS("can clone using 1024x768\n");
336 return true;
337 }
338fail:
339 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
340 return false;
341}
342
343static int drm_client_get_tile_offsets(struct drm_connector **connectors,
344 unsigned int connector_count,
345 struct drm_display_mode **modes,
346 struct drm_client_offset *offsets,
347 int idx,
348 int h_idx, int v_idx)
349{
350 struct drm_connector *connector;
351 int i;
352 int hoffset = 0, voffset = 0;
353
354 for (i = 0; i < connector_count; i++) {
355 connector = connectors[i];
356 if (!connector->has_tile)
357 continue;
358
359 if (!modes[i] && (h_idx || v_idx)) {
360 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
361 connector->base.id);
362 continue;
363 }
364 if (connector->tile_h_loc < h_idx)
365 hoffset += modes[i]->hdisplay;
366
367 if (connector->tile_v_loc < v_idx)
368 voffset += modes[i]->vdisplay;
369 }
370 offsets[idx].x = hoffset;
371 offsets[idx].y = voffset;
372 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
373 return 0;
374}
375
376static bool drm_client_target_preferred(struct drm_connector **connectors,
377 unsigned int connector_count,
378 struct drm_display_mode **modes,
379 struct drm_client_offset *offsets,
380 bool *enabled, int width, int height)
381{
382 const u64 mask = BIT_ULL(connector_count) - 1;
383 struct drm_connector *connector;
384 u64 conn_configured = 0;
385 int tile_pass = 0;
386 int num_tiled_conns = 0;
387 int i;
388
389 for (i = 0; i < connector_count; i++) {
390 if (connectors[i]->has_tile &&
391 connectors[i]->status == connector_status_connected)
392 num_tiled_conns++;
393 }
394
395retry:
396 for (i = 0; i < connector_count; i++) {
397 connector = connectors[i];
398
399 if (conn_configured & BIT_ULL(i))
400 continue;
401
402 if (enabled[i] == false) {
403 conn_configured |= BIT_ULL(i);
404 continue;
405 }
406
407 /* first pass over all the untiled connectors */
408 if (tile_pass == 0 && connector->has_tile)
409 continue;
410
411 if (tile_pass == 1) {
412 if (connector->tile_h_loc != 0 ||
413 connector->tile_v_loc != 0)
414 continue;
415
416 } else {
417 if (connector->tile_h_loc != tile_pass - 1 &&
418 connector->tile_v_loc != tile_pass - 1)
419 /* if this tile_pass doesn't cover any of the tiles - keep going */
420 continue;
421
422 /*
423 * find the tile offsets for this pass - need to find
424 * all tiles left and above
425 */
426 drm_client_get_tile_offsets(connectors, connector_count, modes, offsets, i,
427 connector->tile_h_loc, connector->tile_v_loc);
428 }
429 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
430 connector->base.id);
431
432 /* got for command line mode first */
433 modes[i] = drm_connector_pick_cmdline_mode(connector);
434 if (!modes[i]) {
435 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
436 connector->base.id, connector->tile_group ? connector->tile_group->id : 0);
437 modes[i] = drm_connector_has_preferred_mode(connector, width, height);
438 }
439 /* No preferred modes, pick one off the list */
440 if (!modes[i] && !list_empty(&connector->modes)) {
441 list_for_each_entry(modes[i], &connector->modes, head)
442 break;
443 }
444 /*
445 * In case of tiled mode if all tiles not present fallback to
446 * first available non tiled mode.
447 * After all tiles are present, try to find the tiled mode
448 * for all and if tiled mode not present due to fbcon size
449 * limitations, use first non tiled mode only for
450 * tile 0,0 and set to no mode for all other tiles.
451 */
452 if (connector->has_tile) {
453 if (num_tiled_conns <
454 connector->num_h_tile * connector->num_v_tile ||
455 (connector->tile_h_loc == 0 &&
456 connector->tile_v_loc == 0 &&
457 !drm_connector_get_tiled_mode(connector))) {
458 DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
459 connector->base.id);
460 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
461 } else {
462 modes[i] = drm_connector_get_tiled_mode(connector);
463 }
464 }
465
466 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
467 "none");
468 conn_configured |= BIT_ULL(i);
469 }
470
471 if ((conn_configured & mask) != mask) {
472 tile_pass++;
473 goto retry;
474 }
475 return true;
476}
477
478static bool connector_has_possible_crtc(struct drm_connector *connector,
479 struct drm_crtc *crtc)
480{
481 struct drm_encoder *encoder;
482
483 drm_connector_for_each_possible_encoder(connector, encoder) {
484 if (encoder->possible_crtcs & drm_crtc_mask(crtc))
485 return true;
486 }
487
488 return false;
489}
490
491static int drm_client_pick_crtcs(struct drm_client_dev *client,
492 struct drm_connector **connectors,
493 unsigned int connector_count,
494 struct drm_crtc **best_crtcs,
495 struct drm_display_mode **modes,
496 int n, int width, int height)
497{
498 struct drm_device *dev = client->dev;
499 struct drm_connector *connector;
500 int my_score, best_score, score;
501 struct drm_crtc **crtcs, *crtc;
502 struct drm_mode_set *modeset;
503 int o;
504
505 if (n == connector_count)
506 return 0;
507
508 connector = connectors[n];
509
510 best_crtcs[n] = NULL;
511 best_score = drm_client_pick_crtcs(client, connectors, connector_count,
512 best_crtcs, modes, n + 1, width, height);
513 if (modes[n] == NULL)
514 return best_score;
515
516 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
517 if (!crtcs)
518 return best_score;
519
520 my_score = 1;
521 if (connector->status == connector_status_connected)
522 my_score++;
523 if (connector->cmdline_mode.specified)
524 my_score++;
525 if (drm_connector_has_preferred_mode(connector, width, height))
526 my_score++;
527
528 /*
529 * select a crtc for this connector and then attempt to configure
530 * remaining connectors
531 */
532 drm_client_for_each_modeset(modeset, client) {
533 crtc = modeset->crtc;
534
535 if (!connector_has_possible_crtc(connector, crtc))
536 continue;
537
538 for (o = 0; o < n; o++)
539 if (best_crtcs[o] == crtc)
540 break;
541
542 if (o < n) {
543 /* ignore cloning unless only a single crtc */
544 if (dev->mode_config.num_crtc > 1)
545 continue;
546
547 if (!drm_mode_equal(modes[o], modes[n]))
548 continue;
549 }
550
551 crtcs[n] = crtc;
552 memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
553 score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
554 crtcs, modes, n + 1, width, height);
555 if (score > best_score) {
556 best_score = score;
557 memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
558 }
559 }
560
561 kfree(crtcs);
562 return best_score;
563}
564
565/* Try to read the BIOS display configuration and use it for the initial config */
566static bool drm_client_firmware_config(struct drm_client_dev *client,
567 struct drm_connector **connectors,
568 unsigned int connector_count,
569 struct drm_crtc **crtcs,
570 struct drm_display_mode **modes,
571 struct drm_client_offset *offsets,
572 bool *enabled, int width, int height)
573{
574 const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
575 unsigned long conn_configured, conn_seq, mask;
576 struct drm_device *dev = client->dev;
577 int i, j;
578 bool *save_enabled;
579 bool fallback = true, ret = true;
580 int num_connectors_enabled = 0;
581 int num_connectors_detected = 0;
582 int num_tiled_conns = 0;
583 struct drm_modeset_acquire_ctx ctx;
584
585 if (!drm_drv_uses_atomic_modeset(dev))
586 return false;
587
588 if (WARN_ON(count <= 0))
589 return false;
590
591 save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
592 if (!save_enabled)
593 return false;
594
595 drm_modeset_acquire_init(&ctx, 0);
596
597 while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
598 drm_modeset_backoff(&ctx);
599
600 memcpy(save_enabled, enabled, count);
601 mask = GENMASK(count - 1, 0);
602 conn_configured = 0;
603 for (i = 0; i < count; i++) {
604 if (connectors[i]->has_tile &&
605 connectors[i]->status == connector_status_connected)
606 num_tiled_conns++;
607 }
608retry:
609 conn_seq = conn_configured;
610 for (i = 0; i < count; i++) {
611 struct drm_connector *connector;
612 struct drm_encoder *encoder;
613 struct drm_crtc *new_crtc;
614
615 connector = connectors[i];
616
617 if (conn_configured & BIT(i))
618 continue;
619
620 if (conn_seq == 0 && !connector->has_tile)
621 continue;
622
623 if (connector->status == connector_status_connected)
624 num_connectors_detected++;
625
626 if (!enabled[i]) {
627 DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
628 connector->name);
629 conn_configured |= BIT(i);
630 continue;
631 }
632
633 if (connector->force == DRM_FORCE_OFF) {
634 DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
635 connector->name);
636 enabled[i] = false;
637 continue;
638 }
639
640 encoder = connector->state->best_encoder;
641 if (!encoder || WARN_ON(!connector->state->crtc)) {
642 if (connector->force > DRM_FORCE_OFF)
643 goto bail;
644
645 DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
646 connector->name);
647 enabled[i] = false;
648 conn_configured |= BIT(i);
649 continue;
650 }
651
652 num_connectors_enabled++;
653
654 new_crtc = connector->state->crtc;
655
656 /*
657 * Make sure we're not trying to drive multiple connectors
658 * with a single CRTC, since our cloning support may not
659 * match the BIOS.
660 */
661 for (j = 0; j < count; j++) {
662 if (crtcs[j] == new_crtc) {
663 DRM_DEBUG_KMS("fallback: cloned configuration\n");
664 goto bail;
665 }
666 }
667
668 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
669 connector->name);
670
671 /* go for command line mode first */
672 modes[i] = drm_connector_pick_cmdline_mode(connector);
673
674 /* try for preferred next */
675 if (!modes[i]) {
676 DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
677 connector->name, connector->has_tile);
678 modes[i] = drm_connector_has_preferred_mode(connector, width, height);
679 }
680
681 /* No preferred mode marked by the EDID? Are there any modes? */
682 if (!modes[i] && !list_empty(&connector->modes)) {
683 DRM_DEBUG_KMS("using first mode listed on connector %s\n",
684 connector->name);
685 modes[i] = list_first_entry(&connector->modes,
686 struct drm_display_mode,
687 head);
688 }
689
690 /* last resort: use current mode */
691 if (!modes[i]) {
692 /*
693 * IMPORTANT: We want to use the adjusted mode (i.e.
694 * after the panel fitter upscaling) as the initial
695 * config, not the input mode, which is what crtc->mode
696 * usually contains. But since our current
697 * code puts a mode derived from the post-pfit timings
698 * into crtc->mode this works out correctly.
699 *
700 * This is crtc->mode and not crtc->state->mode for the
701 * fastboot check to work correctly.
702 */
703 DRM_DEBUG_KMS("looking for current mode on connector %s\n",
704 connector->name);
705 modes[i] = &connector->state->crtc->mode;
706 }
707 /*
708 * In case of tiled modes, if all tiles are not present
709 * then fallback to a non tiled mode.
710 */
711 if (connector->has_tile &&
712 num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
713 DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
714 connector->base.id);
715 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
716 }
717 crtcs[i] = new_crtc;
718
719 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
720 connector->name,
721 connector->state->crtc->base.id,
722 connector->state->crtc->name,
723 modes[i]->hdisplay, modes[i]->vdisplay,
724 modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
725
726 fallback = false;
727 conn_configured |= BIT(i);
728 }
729
730 if ((conn_configured & mask) != mask && conn_configured != conn_seq)
731 goto retry;
732
733 /*
734 * If the BIOS didn't enable everything it could, fall back to have the
735 * same user experiencing of lighting up as much as possible like the
736 * fbdev helper library.
737 */
738 if (num_connectors_enabled != num_connectors_detected &&
739 num_connectors_enabled < dev->mode_config.num_crtc) {
740 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
741 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
742 num_connectors_detected);
743 fallback = true;
744 }
745
746 if (fallback) {
747bail:
748 DRM_DEBUG_KMS("Not using firmware configuration\n");
749 memcpy(enabled, save_enabled, count);
750 ret = false;
751 }
752
753 drm_modeset_drop_locks(&ctx);
754 drm_modeset_acquire_fini(&ctx);
755
756 kfree(save_enabled);
757 return ret;
758}
759
760/**
761 * drm_client_modeset_probe() - Probe for displays
762 * @client: DRM client
763 * @width: Maximum display mode width (optional)
764 * @height: Maximum display mode height (optional)
765 *
766 * This function sets up display pipelines for enabled connectors and stores the
767 * config in the client's modeset array.
768 *
769 * Returns:
770 * Zero on success or negative error code on failure.
771 */
772int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
773{
774 struct drm_connector *connector, **connectors = NULL;
775 struct drm_connector_list_iter conn_iter;
776 struct drm_device *dev = client->dev;
777 unsigned int total_modes_count = 0;
778 struct drm_client_offset *offsets;
779 unsigned int connector_count = 0;
780 struct drm_display_mode **modes;
781 struct drm_crtc **crtcs;
782 int i, ret = 0;
783 bool *enabled;
784
785 DRM_DEBUG_KMS("\n");
786
787 if (!width)
788 width = dev->mode_config.max_width;
789 if (!height)
790 height = dev->mode_config.max_height;
791
792 drm_connector_list_iter_begin(dev, &conn_iter);
793 drm_client_for_each_connector_iter(connector, &conn_iter) {
794 struct drm_connector **tmp;
795
796 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
797 if (!tmp) {
798 ret = -ENOMEM;
799 goto free_connectors;
800 }
801
802 connectors = tmp;
803 drm_connector_get(connector);
804 connectors[connector_count++] = connector;
805 }
806 drm_connector_list_iter_end(&conn_iter);
807
808 if (!connector_count)
809 return 0;
810
811 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
812 modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
813 offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
814 enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
815 if (!crtcs || !modes || !enabled || !offsets) {
816 DRM_ERROR("Memory allocation failed\n");
817 ret = -ENOMEM;
818 goto out;
819 }
820
821 mutex_lock(&client->modeset_mutex);
822
823 mutex_lock(&dev->mode_config.mutex);
824 for (i = 0; i < connector_count; i++)
825 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
826 if (!total_modes_count)
827 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
828 drm_client_connectors_enabled(connectors, connector_count, enabled);
829
830 if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
831 modes, offsets, enabled, width, height)) {
832 memset(modes, 0, connector_count * sizeof(*modes));
833 memset(crtcs, 0, connector_count * sizeof(*crtcs));
834 memset(offsets, 0, connector_count * sizeof(*offsets));
835
836 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
837 offsets, enabled, width, height) &&
838 !drm_client_target_preferred(connectors, connector_count, modes,
839 offsets, enabled, width, height))
840 DRM_ERROR("Unable to find initial modes\n");
841
842 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
843 width, height);
844
845 drm_client_pick_crtcs(client, connectors, connector_count,
846 crtcs, modes, 0, width, height);
847 }
848 mutex_unlock(&dev->mode_config.mutex);
849
850 drm_client_modeset_release(client);
851
852 for (i = 0; i < connector_count; i++) {
853 struct drm_display_mode *mode = modes[i];
854 struct drm_crtc *crtc = crtcs[i];
855 struct drm_client_offset *offset = &offsets[i];
856
857 if (mode && crtc) {
858 struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
859 struct drm_connector *connector = connectors[i];
860
861 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
862 mode->name, crtc->base.id, offset->x, offset->y);
863
864 if (WARN_ON_ONCE(modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
865 (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
866 ret = -EINVAL;
867 break;
868 }
869
870 kfree(modeset->mode);
871 modeset->mode = drm_mode_duplicate(dev, mode);
872 drm_connector_get(connector);
873 modeset->connectors[modeset->num_connectors++] = connector;
874 modeset->x = offset->x;
875 modeset->y = offset->y;
876 }
877 }
878
879 mutex_unlock(&client->modeset_mutex);
880out:
881 kfree(crtcs);
882 kfree(modes);
883 kfree(offsets);
884 kfree(enabled);
885free_connectors:
886 for (i = 0; i < connector_count; i++)
887 drm_connector_put(connectors[i]);
888 kfree(connectors);
889
890 return ret;
891}
892EXPORT_SYMBOL(drm_client_modeset_probe);
893
894/**
895 * drm_client_rotation() - Check the initial rotation value
896 * @modeset: DRM modeset
897 * @rotation: Returned rotation value
898 *
899 * This function checks if the primary plane in @modeset can hw rotate
900 * to match the rotation needed on its connector.
901 *
902 * Note: Currently only 0 and 180 degrees are supported.
903 *
904 * Return:
905 * True if the plane can do the rotation, false otherwise.
906 */
907bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
908{
909 struct drm_connector *connector = modeset->connectors[0];
910 struct drm_plane *plane = modeset->crtc->primary;
911 struct drm_cmdline_mode *cmdline;
912 u64 valid_mask = 0;
913 unsigned int i;
914
915 if (!modeset->num_connectors)
916 return false;
917
918 switch (connector->display_info.panel_orientation) {
919 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
920 *rotation = DRM_MODE_ROTATE_180;
921 break;
922 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
923 *rotation = DRM_MODE_ROTATE_90;
924 break;
925 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
926 *rotation = DRM_MODE_ROTATE_270;
927 break;
928 default:
929 *rotation = DRM_MODE_ROTATE_0;
930 }
931
932 /**
933 * The panel already defined the default rotation
934 * through its orientation. Whatever has been provided
935 * on the command line needs to be added to that.
936 *
937 * Unfortunately, the rotations are at different bit
938 * indices, so the math to add them up are not as
939 * trivial as they could.
940 *
941 * Reflections on the other hand are pretty trivial to deal with, a
942 * simple XOR between the two handle the addition nicely.
943 */
944 cmdline = &connector->cmdline_mode;
945 if (cmdline->specified && cmdline->rotation_reflection) {
946 unsigned int cmdline_rest, panel_rest;
947 unsigned int cmdline_rot, panel_rot;
948 unsigned int sum_rot, sum_rest;
949
950 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
951 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
952 sum_rot = (panel_rot + cmdline_rot) % 4;
953
954 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
955 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
956 sum_rest = panel_rest ^ cmdline_rest;
957
958 *rotation = (1 << sum_rot) | sum_rest;
959 }
960
961 /*
962 * TODO: support 90 / 270 degree hardware rotation,
963 * depending on the hardware this may require the framebuffer
964 * to be in a specific tiling format.
965 */
966 if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
967 (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
968 !plane->rotation_property)
969 return false;
970
971 for (i = 0; i < plane->rotation_property->num_values; i++)
972 valid_mask |= (1ULL << plane->rotation_property->values[i]);
973
974 if (!(*rotation & valid_mask))
975 return false;
976
977 return true;
978}
979EXPORT_SYMBOL(drm_client_rotation);
980
981static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
982{
983 struct drm_device *dev = client->dev;
984 struct drm_plane *plane;
985 struct drm_atomic_state *state;
986 struct drm_modeset_acquire_ctx ctx;
987 struct drm_mode_set *mode_set;
988 int ret;
989
990 drm_modeset_acquire_init(&ctx, 0);
991
992 state = drm_atomic_state_alloc(dev);
993 if (!state) {
994 ret = -ENOMEM;
995 goto out_ctx;
996 }
997
998 state->acquire_ctx = &ctx;
999retry:
1000 drm_for_each_plane(plane, dev) {
1001 struct drm_plane_state *plane_state;
1002
1003 plane_state = drm_atomic_get_plane_state(state, plane);
1004 if (IS_ERR(plane_state)) {
1005 ret = PTR_ERR(plane_state);
1006 goto out_state;
1007 }
1008
1009 plane_state->rotation = DRM_MODE_ROTATE_0;
1010
1011 /* disable non-primary: */
1012 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1013 continue;
1014
1015 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1016 if (ret != 0)
1017 goto out_state;
1018 }
1019
1020 drm_client_for_each_modeset(mode_set, client) {
1021 struct drm_plane *primary = mode_set->crtc->primary;
1022 unsigned int rotation;
1023
1024 if (drm_client_rotation(mode_set, &rotation)) {
1025 struct drm_plane_state *plane_state;
1026
1027 /* Cannot fail as we've already gotten the plane state above */
1028 plane_state = drm_atomic_get_new_plane_state(state, primary);
1029 plane_state->rotation = rotation;
1030 }
1031
1032 ret = __drm_atomic_helper_set_config(mode_set, state);
1033 if (ret != 0)
1034 goto out_state;
1035
1036 /*
1037 * __drm_atomic_helper_set_config() sets active when a
1038 * mode is set, unconditionally clear it if we force DPMS off
1039 */
1040 if (!active) {
1041 struct drm_crtc *crtc = mode_set->crtc;
1042 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1043
1044 crtc_state->active = false;
1045 }
1046 }
1047
1048 if (check)
1049 ret = drm_atomic_check_only(state);
1050 else
1051 ret = drm_atomic_commit(state);
1052
1053out_state:
1054 if (ret == -EDEADLK)
1055 goto backoff;
1056
1057 drm_atomic_state_put(state);
1058out_ctx:
1059 drm_modeset_drop_locks(&ctx);
1060 drm_modeset_acquire_fini(&ctx);
1061
1062 return ret;
1063
1064backoff:
1065 drm_atomic_state_clear(state);
1066 drm_modeset_backoff(&ctx);
1067
1068 goto retry;
1069}
1070
1071static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1072{
1073 struct drm_device *dev = client->dev;
1074 struct drm_mode_set *mode_set;
1075 struct drm_plane *plane;
1076 int ret = 0;
1077
1078 drm_modeset_lock_all(dev);
1079 drm_for_each_plane(plane, dev) {
1080 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1081 drm_plane_force_disable(plane);
1082
1083 if (plane->rotation_property)
1084 drm_mode_plane_set_obj_prop(plane,
1085 plane->rotation_property,
1086 DRM_MODE_ROTATE_0);
1087 }
1088
1089 drm_client_for_each_modeset(mode_set, client) {
1090 struct drm_crtc *crtc = mode_set->crtc;
1091
1092 if (crtc->funcs->cursor_set2) {
1093 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1094 if (ret)
1095 goto out;
1096 } else if (crtc->funcs->cursor_set) {
1097 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1098 if (ret)
1099 goto out;
1100 }
1101
1102 ret = drm_mode_set_config_internal(mode_set);
1103 if (ret)
1104 goto out;
1105 }
1106out:
1107 drm_modeset_unlock_all(dev);
1108
1109 return ret;
1110}
1111
1112/**
1113 * drm_client_modeset_check() - Check modeset configuration
1114 * @client: DRM client
1115 *
1116 * Check modeset configuration.
1117 *
1118 * Returns:
1119 * Zero on success or negative error code on failure.
1120 */
1121int drm_client_modeset_check(struct drm_client_dev *client)
1122{
1123 int ret;
1124
1125 if (!drm_drv_uses_atomic_modeset(client->dev))
1126 return 0;
1127
1128 mutex_lock(&client->modeset_mutex);
1129 ret = drm_client_modeset_commit_atomic(client, true, true);
1130 mutex_unlock(&client->modeset_mutex);
1131
1132 return ret;
1133}
1134EXPORT_SYMBOL(drm_client_modeset_check);
1135
1136/**
1137 * drm_client_modeset_commit_locked() - Force commit CRTC configuration
1138 * @client: DRM client
1139 *
1140 * Commit modeset configuration to crtcs without checking if there is a DRM
1141 * master. The assumption is that the caller already holds an internal DRM
1142 * master reference acquired with drm_master_internal_acquire().
1143 *
1144 * Returns:
1145 * Zero on success or negative error code on failure.
1146 */
1147int drm_client_modeset_commit_locked(struct drm_client_dev *client)
1148{
1149 struct drm_device *dev = client->dev;
1150 int ret;
1151
1152 mutex_lock(&client->modeset_mutex);
1153 if (drm_drv_uses_atomic_modeset(dev))
1154 ret = drm_client_modeset_commit_atomic(client, true, false);
1155 else
1156 ret = drm_client_modeset_commit_legacy(client);
1157 mutex_unlock(&client->modeset_mutex);
1158
1159 return ret;
1160}
1161EXPORT_SYMBOL(drm_client_modeset_commit_locked);
1162
1163/**
1164 * drm_client_modeset_commit() - Commit CRTC configuration
1165 * @client: DRM client
1166 *
1167 * Commit modeset configuration to crtcs.
1168 *
1169 * Returns:
1170 * Zero on success or negative error code on failure.
1171 */
1172int drm_client_modeset_commit(struct drm_client_dev *client)
1173{
1174 struct drm_device *dev = client->dev;
1175 int ret;
1176
1177 if (!drm_master_internal_acquire(dev))
1178 return -EBUSY;
1179
1180 ret = drm_client_modeset_commit_locked(client);
1181
1182 drm_master_internal_release(dev);
1183
1184 return ret;
1185}
1186EXPORT_SYMBOL(drm_client_modeset_commit);
1187
1188static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1189{
1190 struct drm_device *dev = client->dev;
1191 struct drm_connector *connector;
1192 struct drm_mode_set *modeset;
1193 struct drm_modeset_acquire_ctx ctx;
1194 int j;
1195 int ret;
1196
1197 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
1198 drm_client_for_each_modeset(modeset, client) {
1199 if (!modeset->crtc->enabled)
1200 continue;
1201
1202 for (j = 0; j < modeset->num_connectors; j++) {
1203 connector = modeset->connectors[j];
1204 connector->funcs->dpms(connector, dpms_mode);
1205 drm_object_property_set_value(&connector->base,
1206 dev->mode_config.dpms_property, dpms_mode);
1207 }
1208 }
1209 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
1210}
1211
1212/**
1213 * drm_client_modeset_dpms() - Set DPMS mode
1214 * @client: DRM client
1215 * @mode: DPMS mode
1216 *
1217 * Note: For atomic drivers @mode is reduced to on/off.
1218 *
1219 * Returns:
1220 * Zero on success or negative error code on failure.
1221 */
1222int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1223{
1224 struct drm_device *dev = client->dev;
1225 int ret = 0;
1226
1227 if (!drm_master_internal_acquire(dev))
1228 return -EBUSY;
1229
1230 mutex_lock(&client->modeset_mutex);
1231 if (drm_drv_uses_atomic_modeset(dev))
1232 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
1233 else
1234 drm_client_modeset_dpms_legacy(client, mode);
1235 mutex_unlock(&client->modeset_mutex);
1236
1237 drm_master_internal_release(dev);
1238
1239 return ret;
1240}
1241EXPORT_SYMBOL(drm_client_modeset_dpms);
1242
1243#ifdef CONFIG_DRM_KUNIT_TEST
1244#include "tests/drm_client_modeset_test.c"
1245#endif