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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_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_first_mode(struct drm_connector *connector)
163{
164 return list_first_entry_or_null(&connector->modes,
165 struct drm_display_mode, head);
166}
167
168static struct drm_display_mode *drm_connector_pick_cmdline_mode(struct drm_connector *connector)
169{
170 struct drm_cmdline_mode *cmdline_mode;
171 struct drm_display_mode *mode;
172 bool prefer_non_interlace;
173
174 /*
175 * Find a user-defined mode. If the user gave us a valid
176 * mode on the kernel command line, it will show up in this
177 * list.
178 */
179
180 list_for_each_entry(mode, &connector->modes, head) {
181 if (mode->type & DRM_MODE_TYPE_USERDEF)
182 return mode;
183 }
184
185 cmdline_mode = &connector->cmdline_mode;
186 if (cmdline_mode->specified == false)
187 return NULL;
188
189 /*
190 * Attempt to find a matching mode in the list of modes we
191 * have gotten so far.
192 */
193
194 prefer_non_interlace = !cmdline_mode->interlace;
195again:
196 list_for_each_entry(mode, &connector->modes, head) {
197 /* check width/height */
198 if (mode->hdisplay != cmdline_mode->xres ||
199 mode->vdisplay != cmdline_mode->yres)
200 continue;
201
202 if (cmdline_mode->refresh_specified) {
203 if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
204 continue;
205 }
206
207 if (cmdline_mode->interlace) {
208 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
209 continue;
210 } else if (prefer_non_interlace) {
211 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
212 continue;
213 }
214 return mode;
215 }
216
217 if (prefer_non_interlace) {
218 prefer_non_interlace = false;
219 goto again;
220 }
221
222 return NULL;
223}
224
225static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
226{
227 bool enable;
228
229 if (connector->display_info.non_desktop)
230 return false;
231
232 if (strict)
233 enable = connector->status == connector_status_connected;
234 else
235 enable = connector->status != connector_status_disconnected;
236
237 return enable;
238}
239
240static void drm_client_connectors_enabled(struct drm_connector **connectors,
241 unsigned int connector_count,
242 bool *enabled)
243{
244 bool any_enabled = false;
245 struct drm_connector *connector;
246 int i = 0;
247
248 for (i = 0; i < connector_count; i++) {
249 connector = connectors[i];
250 enabled[i] = drm_connector_enabled(connector, true);
251 drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] enabled? %s\n",
252 connector->base.id, connector->name,
253 connector->display_info.non_desktop ?
254 "non desktop" : str_yes_no(enabled[i]));
255
256 any_enabled |= enabled[i];
257 }
258
259 if (any_enabled)
260 return;
261
262 for (i = 0; i < connector_count; i++)
263 enabled[i] = drm_connector_enabled(connectors[i], false);
264}
265
266static bool drm_client_target_cloned(struct drm_device *dev,
267 struct drm_connector **connectors,
268 unsigned int connector_count,
269 struct drm_display_mode **modes,
270 struct drm_client_offset *offsets,
271 bool *enabled, int width, int height)
272{
273 int count, i, j;
274 bool can_clone = false;
275 struct drm_display_mode *dmt_mode, *mode;
276
277 /* only contemplate cloning in the single crtc case */
278 if (dev->mode_config.num_crtc > 1)
279 return false;
280
281 count = 0;
282 for (i = 0; i < connector_count; i++) {
283 if (enabled[i])
284 count++;
285 }
286
287 /* only contemplate cloning if more than one connector is enabled */
288 if (count <= 1)
289 return false;
290
291 /* check the command line or if nothing common pick 1024x768 */
292 can_clone = true;
293 for (i = 0; i < connector_count; i++) {
294 if (!enabled[i])
295 continue;
296 modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
297 if (!modes[i]) {
298 can_clone = false;
299 break;
300 }
301 for (j = 0; j < i; j++) {
302 if (!enabled[j])
303 continue;
304 if (!drm_mode_match(modes[j], modes[i],
305 DRM_MODE_MATCH_TIMINGS |
306 DRM_MODE_MATCH_CLOCK |
307 DRM_MODE_MATCH_FLAGS |
308 DRM_MODE_MATCH_3D_FLAGS))
309 can_clone = false;
310 }
311 }
312
313 if (can_clone) {
314 drm_dbg_kms(dev, "can clone using command line\n");
315 return true;
316 }
317
318 /* try and find a 1024x768 mode on each connector */
319 can_clone = true;
320 dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
321
322 if (!dmt_mode)
323 goto fail;
324
325 for (i = 0; i < connector_count; i++) {
326 if (!enabled[i])
327 continue;
328
329 list_for_each_entry(mode, &connectors[i]->modes, head) {
330 if (drm_mode_match(mode, dmt_mode,
331 DRM_MODE_MATCH_TIMINGS |
332 DRM_MODE_MATCH_CLOCK |
333 DRM_MODE_MATCH_FLAGS |
334 DRM_MODE_MATCH_3D_FLAGS))
335 modes[i] = mode;
336 }
337 if (!modes[i])
338 can_clone = false;
339 }
340 drm_mode_destroy(dev, dmt_mode);
341
342 if (can_clone) {
343 drm_dbg_kms(dev, "can clone using 1024x768\n");
344 return true;
345 }
346fail:
347 drm_info(dev, "kms: can't enable cloning when we probably wanted to.\n");
348 return false;
349}
350
351static int drm_client_get_tile_offsets(struct drm_device *dev,
352 struct drm_connector **connectors,
353 unsigned int connector_count,
354 struct drm_display_mode **modes,
355 struct drm_client_offset *offsets,
356 int idx,
357 int h_idx, int v_idx)
358{
359 struct drm_connector *connector;
360 int i;
361 int hoffset = 0, voffset = 0;
362
363 for (i = 0; i < connector_count; i++) {
364 connector = connectors[i];
365 if (!connector->has_tile)
366 continue;
367
368 if (!modes[i] && (h_idx || v_idx)) {
369 drm_dbg_kms(dev,
370 "[CONNECTOR:%d:%s] no modes for connector tiled %d\n",
371 connector->base.id, connector->name, i);
372 continue;
373 }
374 if (connector->tile_h_loc < h_idx)
375 hoffset += modes[i]->hdisplay;
376
377 if (connector->tile_v_loc < v_idx)
378 voffset += modes[i]->vdisplay;
379 }
380 offsets[idx].x = hoffset;
381 offsets[idx].y = voffset;
382 drm_dbg_kms(dev, "returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
383 return 0;
384}
385
386static bool drm_client_target_preferred(struct drm_device *dev,
387 struct drm_connector **connectors,
388 unsigned int connector_count,
389 struct drm_display_mode **modes,
390 struct drm_client_offset *offsets,
391 bool *enabled, int width, int height)
392{
393 const u64 mask = BIT_ULL(connector_count) - 1;
394 struct drm_connector *connector;
395 u64 conn_configured = 0;
396 int tile_pass = 0;
397 int num_tiled_conns = 0;
398 int i;
399
400 for (i = 0; i < connector_count; i++) {
401 if (connectors[i]->has_tile &&
402 connectors[i]->status == connector_status_connected)
403 num_tiled_conns++;
404 }
405
406retry:
407 for (i = 0; i < connector_count; i++) {
408 connector = connectors[i];
409
410 if (conn_configured & BIT_ULL(i))
411 continue;
412
413 if (enabled[i] == false) {
414 conn_configured |= BIT_ULL(i);
415 continue;
416 }
417
418 /* first pass over all the untiled connectors */
419 if (tile_pass == 0 && connector->has_tile)
420 continue;
421
422 if (tile_pass == 1) {
423 if (connector->tile_h_loc != 0 ||
424 connector->tile_v_loc != 0)
425 continue;
426
427 } else {
428 if (connector->tile_h_loc != tile_pass - 1 &&
429 connector->tile_v_loc != tile_pass - 1)
430 /* if this tile_pass doesn't cover any of the tiles - keep going */
431 continue;
432
433 /*
434 * find the tile offsets for this pass - need to find
435 * all tiles left and above
436 */
437 drm_client_get_tile_offsets(dev, connectors, connector_count,
438 modes, offsets, i,
439 connector->tile_h_loc, connector->tile_v_loc);
440 }
441 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for cmdline mode\n",
442 connector->base.id, connector->name);
443
444 /* got for command line mode first */
445 modes[i] = drm_connector_pick_cmdline_mode(connector);
446 if (!modes[i]) {
447 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for preferred mode, tile %d\n",
448 connector->base.id, connector->name,
449 connector->tile_group ? connector->tile_group->id : 0);
450 modes[i] = drm_connector_preferred_mode(connector, width, height);
451 }
452 /* No preferred modes, pick one off the list */
453 if (!modes[i])
454 modes[i] = drm_connector_first_mode(connector);
455 /*
456 * In case of tiled mode if all tiles not present fallback to
457 * first available non tiled mode.
458 * After all tiles are present, try to find the tiled mode
459 * for all and if tiled mode not present due to fbcon size
460 * limitations, use first non tiled mode only for
461 * tile 0,0 and set to no mode for all other tiles.
462 */
463 if (connector->has_tile) {
464 if (num_tiled_conns <
465 connector->num_h_tile * connector->num_v_tile ||
466 (connector->tile_h_loc == 0 &&
467 connector->tile_v_loc == 0 &&
468 !drm_connector_get_tiled_mode(connector))) {
469 drm_dbg_kms(dev,
470 "[CONNECTOR:%d:%s] Falling back to non-tiled mode\n",
471 connector->base.id, connector->name);
472 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
473 } else {
474 modes[i] = drm_connector_get_tiled_mode(connector);
475 }
476 }
477
478 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Found mode %s\n",
479 connector->base.id, connector->name,
480 modes[i] ? modes[i]->name : "none");
481 conn_configured |= BIT_ULL(i);
482 }
483
484 if ((conn_configured & mask) != mask) {
485 tile_pass++;
486 goto retry;
487 }
488 return true;
489}
490
491static bool connector_has_possible_crtc(struct drm_connector *connector,
492 struct drm_crtc *crtc)
493{
494 struct drm_encoder *encoder;
495
496 drm_connector_for_each_possible_encoder(connector, encoder) {
497 if (encoder->possible_crtcs & drm_crtc_mask(crtc))
498 return true;
499 }
500
501 return false;
502}
503
504static int drm_client_pick_crtcs(struct drm_client_dev *client,
505 struct drm_connector **connectors,
506 unsigned int connector_count,
507 struct drm_crtc **best_crtcs,
508 struct drm_display_mode **modes,
509 int n, int width, int height)
510{
511 struct drm_device *dev = client->dev;
512 struct drm_connector *connector;
513 int my_score, best_score, score;
514 struct drm_crtc **crtcs, *crtc;
515 struct drm_mode_set *modeset;
516 int o;
517
518 if (n == connector_count)
519 return 0;
520
521 connector = connectors[n];
522
523 best_crtcs[n] = NULL;
524 best_score = drm_client_pick_crtcs(client, connectors, connector_count,
525 best_crtcs, modes, n + 1, width, height);
526 if (modes[n] == NULL)
527 return best_score;
528
529 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
530 if (!crtcs)
531 return best_score;
532
533 my_score = 1;
534 if (connector->status == connector_status_connected)
535 my_score++;
536 if (connector->cmdline_mode.specified)
537 my_score++;
538 if (drm_connector_preferred_mode(connector, width, height))
539 my_score++;
540
541 /*
542 * select a crtc for this connector and then attempt to configure
543 * remaining connectors
544 */
545 drm_client_for_each_modeset(modeset, client) {
546 crtc = modeset->crtc;
547
548 if (!connector_has_possible_crtc(connector, crtc))
549 continue;
550
551 for (o = 0; o < n; o++)
552 if (best_crtcs[o] == crtc)
553 break;
554
555 if (o < n) {
556 /* ignore cloning unless only a single crtc */
557 if (dev->mode_config.num_crtc > 1)
558 continue;
559
560 if (!drm_mode_equal(modes[o], modes[n]))
561 continue;
562 }
563
564 crtcs[n] = crtc;
565 memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
566 score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
567 crtcs, modes, n + 1, width, height);
568 if (score > best_score) {
569 best_score = score;
570 memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
571 }
572 }
573
574 kfree(crtcs);
575 return best_score;
576}
577
578/* Try to read the BIOS display configuration and use it for the initial config */
579static bool drm_client_firmware_config(struct drm_client_dev *client,
580 struct drm_connector **connectors,
581 unsigned int connector_count,
582 struct drm_crtc **crtcs,
583 struct drm_display_mode **modes,
584 struct drm_client_offset *offsets,
585 bool *enabled, int width, int height)
586{
587 const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
588 unsigned long conn_configured, conn_seq, mask;
589 struct drm_device *dev = client->dev;
590 int i, j;
591 bool *save_enabled;
592 bool fallback = true, ret = true;
593 int num_connectors_enabled = 0;
594 int num_connectors_detected = 0;
595 int num_tiled_conns = 0;
596 struct drm_modeset_acquire_ctx ctx;
597
598 if (!drm_drv_uses_atomic_modeset(dev))
599 return false;
600
601 if (drm_WARN_ON(dev, count <= 0))
602 return false;
603
604 save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
605 if (!save_enabled)
606 return false;
607
608 drm_modeset_acquire_init(&ctx, 0);
609
610 while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
611 drm_modeset_backoff(&ctx);
612
613 memcpy(save_enabled, enabled, count);
614 mask = GENMASK(count - 1, 0);
615 conn_configured = 0;
616 for (i = 0; i < count; i++) {
617 if (connectors[i]->has_tile &&
618 connectors[i]->status == connector_status_connected)
619 num_tiled_conns++;
620 }
621retry:
622 conn_seq = conn_configured;
623 for (i = 0; i < count; i++) {
624 struct drm_connector *connector;
625 struct drm_encoder *encoder;
626 struct drm_crtc *new_crtc;
627
628 connector = connectors[i];
629
630 if (conn_configured & BIT(i))
631 continue;
632
633 if (conn_seq == 0 && !connector->has_tile)
634 continue;
635
636 if (connector->status == connector_status_connected)
637 num_connectors_detected++;
638
639 if (!enabled[i]) {
640 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] not enabled, skipping\n",
641 connector->base.id, connector->name);
642 conn_configured |= BIT(i);
643 continue;
644 }
645
646 if (connector->force == DRM_FORCE_OFF) {
647 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] disabled by user, skipping\n",
648 connector->base.id, connector->name);
649 enabled[i] = false;
650 continue;
651 }
652
653 encoder = connector->state->best_encoder;
654 if (!encoder || drm_WARN_ON(dev, !connector->state->crtc)) {
655 if (connector->force > DRM_FORCE_OFF)
656 goto bail;
657
658 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] has no encoder or crtc, skipping\n",
659 connector->base.id, connector->name);
660 enabled[i] = false;
661 conn_configured |= BIT(i);
662 continue;
663 }
664
665 num_connectors_enabled++;
666
667 new_crtc = connector->state->crtc;
668
669 /*
670 * Make sure we're not trying to drive multiple connectors
671 * with a single CRTC, since our cloning support may not
672 * match the BIOS.
673 */
674 for (j = 0; j < count; j++) {
675 if (crtcs[j] == new_crtc) {
676 drm_dbg_kms(dev, "fallback: cloned configuration\n");
677 goto bail;
678 }
679 }
680
681 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for cmdline mode\n",
682 connector->base.id, connector->name);
683
684 /* go for command line mode first */
685 modes[i] = drm_connector_pick_cmdline_mode(connector);
686
687 /* try for preferred next */
688 if (!modes[i]) {
689 drm_dbg_kms(dev,
690 "[CONNECTOR:%d:%s] looking for preferred mode, has tile: %s\n",
691 connector->base.id, connector->name,
692 str_yes_no(connector->has_tile));
693 modes[i] = drm_connector_preferred_mode(connector, width, height);
694 }
695
696 /* No preferred mode marked by the EDID? Are there any modes? */
697 if (!modes[i] && !list_empty(&connector->modes)) {
698 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] using first listed mode\n",
699 connector->base.id, connector->name);
700 modes[i] = drm_connector_first_mode(connector);
701 }
702
703 /* last resort: use current mode */
704 if (!modes[i]) {
705 /*
706 * IMPORTANT: We want to use the adjusted mode (i.e.
707 * after the panel fitter upscaling) as the initial
708 * config, not the input mode, which is what crtc->mode
709 * usually contains. But since our current
710 * code puts a mode derived from the post-pfit timings
711 * into crtc->mode this works out correctly.
712 *
713 * This is crtc->mode and not crtc->state->mode for the
714 * fastboot check to work correctly.
715 */
716 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for current mode\n",
717 connector->base.id, connector->name);
718 modes[i] = &connector->state->crtc->mode;
719 }
720 /*
721 * In case of tiled modes, if all tiles are not present
722 * then fallback to a non tiled mode.
723 */
724 if (connector->has_tile &&
725 num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
726 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Falling back to non-tiled mode\n",
727 connector->base.id, connector->name);
728 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
729 }
730 crtcs[i] = new_crtc;
731
732 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] on [CRTC:%d:%s]: %dx%d%s\n",
733 connector->base.id, connector->name,
734 connector->state->crtc->base.id,
735 connector->state->crtc->name,
736 modes[i]->hdisplay, modes[i]->vdisplay,
737 modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
738
739 fallback = false;
740 conn_configured |= BIT(i);
741 }
742
743 if ((conn_configured & mask) != mask && conn_configured != conn_seq)
744 goto retry;
745
746 for (i = 0; i < count; i++) {
747 struct drm_connector *connector = connectors[i];
748
749 if (connector->has_tile)
750 drm_client_get_tile_offsets(dev, connectors, connector_count,
751 modes, offsets, i,
752 connector->tile_h_loc, connector->tile_v_loc);
753 }
754
755 /*
756 * If the BIOS didn't enable everything it could, fall back to have the
757 * same user experiencing of lighting up as much as possible like the
758 * fbdev helper library.
759 */
760 if (num_connectors_enabled != num_connectors_detected &&
761 num_connectors_enabled < dev->mode_config.num_crtc) {
762 drm_dbg_kms(dev, "fallback: Not all outputs enabled\n");
763 drm_dbg_kms(dev, "Enabled: %i, detected: %i\n",
764 num_connectors_enabled, num_connectors_detected);
765 fallback = true;
766 }
767
768 if (fallback) {
769bail:
770 drm_dbg_kms(dev, "Not using firmware configuration\n");
771 memcpy(enabled, save_enabled, count);
772 ret = false;
773 }
774
775 drm_modeset_drop_locks(&ctx);
776 drm_modeset_acquire_fini(&ctx);
777
778 kfree(save_enabled);
779 return ret;
780}
781
782/**
783 * drm_client_modeset_probe() - Probe for displays
784 * @client: DRM client
785 * @width: Maximum display mode width (optional)
786 * @height: Maximum display mode height (optional)
787 *
788 * This function sets up display pipelines for enabled connectors and stores the
789 * config in the client's modeset array.
790 *
791 * Returns:
792 * Zero on success or negative error code on failure.
793 */
794int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
795{
796 struct drm_connector *connector, **connectors = NULL;
797 struct drm_connector_list_iter conn_iter;
798 struct drm_device *dev = client->dev;
799 unsigned int total_modes_count = 0;
800 struct drm_client_offset *offsets;
801 unsigned int connector_count = 0;
802 /* points to modes protected by mode_config.mutex */
803 struct drm_display_mode **modes;
804 struct drm_crtc **crtcs;
805 int i, ret = 0;
806 bool *enabled;
807
808 drm_dbg_kms(dev, "\n");
809
810 if (!width)
811 width = dev->mode_config.max_width;
812 if (!height)
813 height = dev->mode_config.max_height;
814
815 drm_connector_list_iter_begin(dev, &conn_iter);
816 drm_client_for_each_connector_iter(connector, &conn_iter) {
817 struct drm_connector **tmp;
818
819 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
820 if (!tmp) {
821 ret = -ENOMEM;
822 goto free_connectors;
823 }
824
825 connectors = tmp;
826 drm_connector_get(connector);
827 connectors[connector_count++] = connector;
828 }
829 drm_connector_list_iter_end(&conn_iter);
830
831 if (!connector_count)
832 return 0;
833
834 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
835 modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
836 offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
837 enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
838 if (!crtcs || !modes || !enabled || !offsets) {
839 ret = -ENOMEM;
840 goto out;
841 }
842
843 mutex_lock(&client->modeset_mutex);
844
845 mutex_lock(&dev->mode_config.mutex);
846 for (i = 0; i < connector_count; i++)
847 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
848 if (!total_modes_count)
849 drm_dbg_kms(dev, "No connectors reported connected with modes\n");
850 drm_client_connectors_enabled(connectors, connector_count, enabled);
851
852 if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
853 modes, offsets, enabled, width, height)) {
854 memset(modes, 0, connector_count * sizeof(*modes));
855 memset(crtcs, 0, connector_count * sizeof(*crtcs));
856 memset(offsets, 0, connector_count * sizeof(*offsets));
857
858 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
859 offsets, enabled, width, height) &&
860 !drm_client_target_preferred(dev, connectors, connector_count, modes,
861 offsets, enabled, width, height))
862 drm_err(dev, "Unable to find initial modes\n");
863
864 drm_dbg_kms(dev, "picking CRTCs for %dx%d config\n",
865 width, height);
866
867 drm_client_pick_crtcs(client, connectors, connector_count,
868 crtcs, modes, 0, width, height);
869 }
870
871 drm_client_modeset_release(client);
872
873 for (i = 0; i < connector_count; i++) {
874 struct drm_display_mode *mode = modes[i];
875 struct drm_crtc *crtc = crtcs[i];
876 struct drm_client_offset *offset = &offsets[i];
877
878 if (mode && crtc) {
879 struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
880 struct drm_connector *connector = connectors[i];
881
882 drm_dbg_kms(dev, "[CRTC:%d:%s] desired mode %s set (%d,%d)\n",
883 crtc->base.id, crtc->name,
884 mode->name, offset->x, offset->y);
885
886 if (drm_WARN_ON_ONCE(dev, modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
887 (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
888 ret = -EINVAL;
889 break;
890 }
891
892 drm_mode_destroy(dev, modeset->mode);
893 modeset->mode = drm_mode_duplicate(dev, mode);
894 if (!modeset->mode) {
895 ret = -ENOMEM;
896 break;
897 }
898
899 drm_connector_get(connector);
900 modeset->connectors[modeset->num_connectors++] = connector;
901 modeset->x = offset->x;
902 modeset->y = offset->y;
903 }
904 }
905 mutex_unlock(&dev->mode_config.mutex);
906
907 mutex_unlock(&client->modeset_mutex);
908out:
909 kfree(crtcs);
910 kfree(modes);
911 kfree(offsets);
912 kfree(enabled);
913free_connectors:
914 for (i = 0; i < connector_count; i++)
915 drm_connector_put(connectors[i]);
916 kfree(connectors);
917
918 return ret;
919}
920EXPORT_SYMBOL(drm_client_modeset_probe);
921
922/**
923 * drm_client_rotation() - Check the initial rotation value
924 * @modeset: DRM modeset
925 * @rotation: Returned rotation value
926 *
927 * This function checks if the primary plane in @modeset can hw rotate
928 * to match the rotation needed on its connector.
929 *
930 * Note: Currently only 0 and 180 degrees are supported.
931 *
932 * Return:
933 * True if the plane can do the rotation, false otherwise.
934 */
935bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
936{
937 struct drm_connector *connector = modeset->connectors[0];
938 struct drm_plane *plane = modeset->crtc->primary;
939 struct drm_cmdline_mode *cmdline;
940 u64 valid_mask = 0;
941 unsigned int i;
942
943 if (!modeset->num_connectors)
944 return false;
945
946 switch (connector->display_info.panel_orientation) {
947 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
948 *rotation = DRM_MODE_ROTATE_180;
949 break;
950 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
951 *rotation = DRM_MODE_ROTATE_90;
952 break;
953 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
954 *rotation = DRM_MODE_ROTATE_270;
955 break;
956 default:
957 *rotation = DRM_MODE_ROTATE_0;
958 }
959
960 /**
961 * The panel already defined the default rotation
962 * through its orientation. Whatever has been provided
963 * on the command line needs to be added to that.
964 *
965 * Unfortunately, the rotations are at different bit
966 * indices, so the math to add them up are not as
967 * trivial as they could.
968 *
969 * Reflections on the other hand are pretty trivial to deal with, a
970 * simple XOR between the two handle the addition nicely.
971 */
972 cmdline = &connector->cmdline_mode;
973 if (cmdline->specified && cmdline->rotation_reflection) {
974 unsigned int cmdline_rest, panel_rest;
975 unsigned int cmdline_rot, panel_rot;
976 unsigned int sum_rot, sum_rest;
977
978 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
979 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
980 sum_rot = (panel_rot + cmdline_rot) % 4;
981
982 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
983 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
984 sum_rest = panel_rest ^ cmdline_rest;
985
986 *rotation = (1 << sum_rot) | sum_rest;
987 }
988
989 /*
990 * TODO: support 90 / 270 degree hardware rotation,
991 * depending on the hardware this may require the framebuffer
992 * to be in a specific tiling format.
993 */
994 if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
995 (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
996 !plane->rotation_property)
997 return false;
998
999 for (i = 0; i < plane->rotation_property->num_values; i++)
1000 valid_mask |= (1ULL << plane->rotation_property->values[i]);
1001
1002 if (!(*rotation & valid_mask))
1003 return false;
1004
1005 return true;
1006}
1007EXPORT_SYMBOL(drm_client_rotation);
1008
1009static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
1010{
1011 struct drm_device *dev = client->dev;
1012 struct drm_plane *plane;
1013 struct drm_atomic_state *state;
1014 struct drm_modeset_acquire_ctx ctx;
1015 struct drm_mode_set *mode_set;
1016 int ret;
1017
1018 drm_modeset_acquire_init(&ctx, 0);
1019
1020 state = drm_atomic_state_alloc(dev);
1021 if (!state) {
1022 ret = -ENOMEM;
1023 goto out_ctx;
1024 }
1025
1026 state->acquire_ctx = &ctx;
1027retry:
1028 drm_for_each_plane(plane, dev) {
1029 struct drm_plane_state *plane_state;
1030
1031 plane_state = drm_atomic_get_plane_state(state, plane);
1032 if (IS_ERR(plane_state)) {
1033 ret = PTR_ERR(plane_state);
1034 goto out_state;
1035 }
1036
1037 plane_state->rotation = DRM_MODE_ROTATE_0;
1038
1039 /* disable non-primary: */
1040 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1041 continue;
1042
1043 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1044 if (ret != 0)
1045 goto out_state;
1046 }
1047
1048 drm_client_for_each_modeset(mode_set, client) {
1049 struct drm_plane *primary = mode_set->crtc->primary;
1050 unsigned int rotation;
1051
1052 if (drm_client_rotation(mode_set, &rotation)) {
1053 struct drm_plane_state *plane_state;
1054
1055 /* Cannot fail as we've already gotten the plane state above */
1056 plane_state = drm_atomic_get_new_plane_state(state, primary);
1057 plane_state->rotation = rotation;
1058 }
1059
1060 ret = __drm_atomic_helper_set_config(mode_set, state);
1061 if (ret != 0)
1062 goto out_state;
1063
1064 /*
1065 * __drm_atomic_helper_set_config() sets active when a
1066 * mode is set, unconditionally clear it if we force DPMS off
1067 */
1068 if (!active) {
1069 struct drm_crtc *crtc = mode_set->crtc;
1070 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1071
1072 crtc_state->active = false;
1073 }
1074 }
1075
1076 if (check)
1077 ret = drm_atomic_check_only(state);
1078 else
1079 ret = drm_atomic_commit(state);
1080
1081out_state:
1082 if (ret == -EDEADLK)
1083 goto backoff;
1084
1085 drm_atomic_state_put(state);
1086out_ctx:
1087 drm_modeset_drop_locks(&ctx);
1088 drm_modeset_acquire_fini(&ctx);
1089
1090 return ret;
1091
1092backoff:
1093 drm_atomic_state_clear(state);
1094 drm_modeset_backoff(&ctx);
1095
1096 goto retry;
1097}
1098
1099static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1100{
1101 struct drm_device *dev = client->dev;
1102 struct drm_mode_set *mode_set;
1103 struct drm_plane *plane;
1104 int ret = 0;
1105
1106 drm_modeset_lock_all(dev);
1107 drm_for_each_plane(plane, dev) {
1108 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1109 drm_plane_force_disable(plane);
1110
1111 if (plane->rotation_property)
1112 drm_mode_plane_set_obj_prop(plane,
1113 plane->rotation_property,
1114 DRM_MODE_ROTATE_0);
1115 }
1116
1117 drm_client_for_each_modeset(mode_set, client) {
1118 struct drm_crtc *crtc = mode_set->crtc;
1119
1120 if (crtc->funcs->cursor_set2) {
1121 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1122 if (ret)
1123 goto out;
1124 } else if (crtc->funcs->cursor_set) {
1125 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1126 if (ret)
1127 goto out;
1128 }
1129
1130 ret = drm_mode_set_config_internal(mode_set);
1131 if (ret)
1132 goto out;
1133 }
1134out:
1135 drm_modeset_unlock_all(dev);
1136
1137 return ret;
1138}
1139
1140/**
1141 * drm_client_modeset_check() - Check modeset configuration
1142 * @client: DRM client
1143 *
1144 * Check modeset configuration.
1145 *
1146 * Returns:
1147 * Zero on success or negative error code on failure.
1148 */
1149int drm_client_modeset_check(struct drm_client_dev *client)
1150{
1151 int ret;
1152
1153 if (!drm_drv_uses_atomic_modeset(client->dev))
1154 return 0;
1155
1156 mutex_lock(&client->modeset_mutex);
1157 ret = drm_client_modeset_commit_atomic(client, true, true);
1158 mutex_unlock(&client->modeset_mutex);
1159
1160 return ret;
1161}
1162EXPORT_SYMBOL(drm_client_modeset_check);
1163
1164/**
1165 * drm_client_modeset_commit_locked() - Force commit CRTC configuration
1166 * @client: DRM client
1167 *
1168 * Commit modeset configuration to crtcs without checking if there is a DRM
1169 * master. The assumption is that the caller already holds an internal DRM
1170 * master reference acquired with drm_master_internal_acquire().
1171 *
1172 * Returns:
1173 * Zero on success or negative error code on failure.
1174 */
1175int drm_client_modeset_commit_locked(struct drm_client_dev *client)
1176{
1177 struct drm_device *dev = client->dev;
1178 int ret;
1179
1180 mutex_lock(&client->modeset_mutex);
1181 if (drm_drv_uses_atomic_modeset(dev))
1182 ret = drm_client_modeset_commit_atomic(client, true, false);
1183 else
1184 ret = drm_client_modeset_commit_legacy(client);
1185 mutex_unlock(&client->modeset_mutex);
1186
1187 return ret;
1188}
1189EXPORT_SYMBOL(drm_client_modeset_commit_locked);
1190
1191/**
1192 * drm_client_modeset_commit() - Commit CRTC configuration
1193 * @client: DRM client
1194 *
1195 * Commit modeset configuration to crtcs.
1196 *
1197 * Returns:
1198 * Zero on success or negative error code on failure.
1199 */
1200int drm_client_modeset_commit(struct drm_client_dev *client)
1201{
1202 struct drm_device *dev = client->dev;
1203 int ret;
1204
1205 if (!drm_master_internal_acquire(dev))
1206 return -EBUSY;
1207
1208 ret = drm_client_modeset_commit_locked(client);
1209
1210 drm_master_internal_release(dev);
1211
1212 return ret;
1213}
1214EXPORT_SYMBOL(drm_client_modeset_commit);
1215
1216static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1217{
1218 struct drm_device *dev = client->dev;
1219 struct drm_connector *connector;
1220 struct drm_mode_set *modeset;
1221 struct drm_modeset_acquire_ctx ctx;
1222 int j;
1223 int ret;
1224
1225 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
1226 drm_client_for_each_modeset(modeset, client) {
1227 if (!modeset->crtc->enabled)
1228 continue;
1229
1230 for (j = 0; j < modeset->num_connectors; j++) {
1231 connector = modeset->connectors[j];
1232 connector->funcs->dpms(connector, dpms_mode);
1233 drm_object_property_set_value(&connector->base,
1234 dev->mode_config.dpms_property, dpms_mode);
1235 }
1236 }
1237 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
1238}
1239
1240/**
1241 * drm_client_modeset_dpms() - Set DPMS mode
1242 * @client: DRM client
1243 * @mode: DPMS mode
1244 *
1245 * Note: For atomic drivers @mode is reduced to on/off.
1246 *
1247 * Returns:
1248 * Zero on success or negative error code on failure.
1249 */
1250int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1251{
1252 struct drm_device *dev = client->dev;
1253 int ret = 0;
1254
1255 if (!drm_master_internal_acquire(dev))
1256 return -EBUSY;
1257
1258 mutex_lock(&client->modeset_mutex);
1259 if (drm_drv_uses_atomic_modeset(dev))
1260 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
1261 else
1262 drm_client_modeset_dpms_legacy(client, mode);
1263 mutex_unlock(&client->modeset_mutex);
1264
1265 drm_master_internal_release(dev);
1266
1267 return ret;
1268}
1269EXPORT_SYMBOL(drm_client_modeset_dpms);
1270
1271#ifdef CONFIG_DRM_KUNIT_TEST
1272#include "tests/drm_client_modeset_test.c"
1273#endif