1 /* $NetBSD: drm_client_modeset.c,v 1.3 2021/12/19 02:00:03 riastradh Exp $ */
2
3 // SPDX-License-Identifier: MIT
4 /*
5 * Copyright 2018 Noralf Trønnes
6 * Copyright (c) 2006-2009 Red Hat Inc.
7 * Copyright (c) 2006-2008 Intel Corporation
8 * Jesse Barnes <jesse.barnes@intel.com>
9 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
10 */
11
12 #include <sys/cdefs.h>
13 __KERNEL_RCSID(0, "$NetBSD: drm_client_modeset.c,v 1.3 2021/12/19 02:00:03 riastradh Exp $");
14
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/slab.h>
18
19 #include <drm/drm_atomic.h>
20 #include <drm/drm_client.h>
21 #include <drm/drm_connector.h>
22 #include <drm/drm_crtc.h>
23 #include <drm/drm_device.h>
24 #include <drm/drm_drv.h>
25 #include <drm/drm_encoder.h>
26 #include <drm/drm_print.h>
27
28 #include "drm_crtc_internal.h"
29 #include "drm_internal.h"
30
31 #include <linux/nbsd-namespace.h>
32
33 #define DRM_CLIENT_MAX_CLONED_CONNECTORS 8
34
35 struct drm_client_offset {
36 int x, y;
37 };
38
drm_client_modeset_create(struct drm_client_dev * client)39 int drm_client_modeset_create(struct drm_client_dev *client)
40 {
41 struct drm_device *dev = client->dev;
42 unsigned int num_crtc = dev->mode_config.num_crtc;
43 unsigned int max_connector_count = 1;
44 struct drm_mode_set *modeset;
45 struct drm_crtc *crtc;
46 unsigned int i = 0;
47
48 /* Add terminating zero entry to enable index less iteration */
49 client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
50 if (!client->modesets)
51 return -ENOMEM;
52
53 mutex_init(&client->modeset_mutex);
54
55 drm_for_each_crtc(crtc, dev)
56 client->modesets[i++].crtc = crtc;
57
58 /* Cloning is only supported in the single crtc case. */
59 if (num_crtc == 1)
60 max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
61
62 for (modeset = client->modesets; modeset->crtc; modeset++) {
63 modeset->connectors = kcalloc(max_connector_count,
64 sizeof(*modeset->connectors), GFP_KERNEL);
65 if (!modeset->connectors)
66 goto err_free;
67 }
68
69 return 0;
70
71 err_free:
72 drm_client_modeset_free(client);
73
74 return -ENOMEM;
75 }
76
drm_client_modeset_release(struct drm_client_dev * client)77 static void drm_client_modeset_release(struct drm_client_dev *client)
78 {
79 struct drm_mode_set *modeset;
80 unsigned int i;
81
82 drm_client_for_each_modeset(modeset, client) {
83 drm_mode_destroy(client->dev, modeset->mode);
84 modeset->mode = NULL;
85 modeset->fb = NULL;
86
87 for (i = 0; i < modeset->num_connectors; i++) {
88 drm_connector_put(modeset->connectors[i]);
89 modeset->connectors[i] = NULL;
90 }
91 modeset->num_connectors = 0;
92 }
93 }
94
drm_client_modeset_free(struct drm_client_dev * client)95 void drm_client_modeset_free(struct drm_client_dev *client)
96 {
97 struct drm_mode_set *modeset;
98
99 mutex_lock(&client->modeset_mutex);
100
101 drm_client_modeset_release(client);
102
103 drm_client_for_each_modeset(modeset, client)
104 kfree(modeset->connectors);
105
106 mutex_unlock(&client->modeset_mutex);
107
108 mutex_destroy(&client->modeset_mutex);
109 kfree(client->modesets);
110 }
111
112 static struct drm_mode_set *
drm_client_find_modeset(struct drm_client_dev * client,struct drm_crtc * crtc)113 drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
114 {
115 struct drm_mode_set *modeset;
116
117 drm_client_for_each_modeset(modeset, client)
118 if (modeset->crtc == crtc)
119 return modeset;
120
121 return NULL;
122 }
123
124 static struct drm_display_mode *
drm_connector_get_tiled_mode(struct drm_connector * connector)125 drm_connector_get_tiled_mode(struct drm_connector *connector)
126 {
127 struct drm_display_mode *mode;
128
129 list_for_each_entry(mode, &connector->modes, head) {
130 if (mode->hdisplay == connector->tile_h_size &&
131 mode->vdisplay == connector->tile_v_size)
132 return mode;
133 }
134 return NULL;
135 }
136
137 static struct drm_display_mode *
drm_connector_fallback_non_tiled_mode(struct drm_connector * connector)138 drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
139 {
140 struct drm_display_mode *mode;
141
142 list_for_each_entry(mode, &connector->modes, head) {
143 if (mode->hdisplay == connector->tile_h_size &&
144 mode->vdisplay == connector->tile_v_size)
145 continue;
146 return mode;
147 }
148 return NULL;
149 }
150
151 static struct drm_display_mode *
drm_connector_has_preferred_mode(struct drm_connector * connector,int width,int height)152 drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
153 {
154 struct drm_display_mode *mode;
155
156 list_for_each_entry(mode, &connector->modes, head) {
157 if (mode->hdisplay > width ||
158 mode->vdisplay > height)
159 continue;
160 if (mode->type & DRM_MODE_TYPE_PREFERRED)
161 return mode;
162 }
163 return NULL;
164 }
165
166 static struct drm_display_mode *
drm_connector_pick_cmdline_mode(struct drm_connector * connector)167 drm_connector_pick_cmdline_mode(struct drm_connector *connector)
168 {
169 struct drm_cmdline_mode *cmdline_mode;
170 struct drm_display_mode *mode;
171 bool prefer_non_interlace;
172
173 cmdline_mode = &connector->cmdline_mode;
174 if (cmdline_mode->specified == false)
175 return NULL;
176
177 /* attempt to find a matching mode in the list of modes
178 * we have gotten so far, if not add a CVT mode that conforms
179 */
180 if (cmdline_mode->rb || cmdline_mode->margins)
181 goto create_mode;
182
183 prefer_non_interlace = !cmdline_mode->interlace;
184 again:
185 list_for_each_entry(mode, &connector->modes, head) {
186 /* Check (optional) mode name first */
187 if (!strcmp(mode->name, cmdline_mode->name))
188 return mode;
189
190 /* check width/height */
191 if (mode->hdisplay != cmdline_mode->xres ||
192 mode->vdisplay != cmdline_mode->yres)
193 continue;
194
195 if (cmdline_mode->refresh_specified) {
196 if (mode->vrefresh != cmdline_mode->refresh)
197 continue;
198 }
199
200 if (cmdline_mode->interlace) {
201 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
202 continue;
203 } else if (prefer_non_interlace) {
204 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
205 continue;
206 }
207 return mode;
208 }
209
210 if (prefer_non_interlace) {
211 prefer_non_interlace = false;
212 goto again;
213 }
214
215 create_mode:
216 mode = drm_mode_create_from_cmdline_mode(connector->dev, cmdline_mode);
217 if (mode)
218 list_add(&mode->head, &connector->modes);
219
220 return mode;
221 }
222
drm_connector_enabled(struct drm_connector * connector,bool strict)223 static 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
drm_client_connectors_enabled(struct drm_connector ** connectors,unsigned int connector_count,bool * enabled)238 static 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" : enabled[i] ? "yes" : "no");
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
drm_client_target_cloned(struct drm_device * dev,struct drm_connector ** connectors,unsigned int connector_count,struct drm_display_mode ** modes,struct drm_client_offset * offsets,bool * enabled,int width,int height)262 static 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
drm_client_get_tile_offsets(struct drm_connector ** connectors,unsigned int connector_count,struct drm_display_mode ** modes,struct drm_client_offset * offsets,int idx,int h_idx,int v_idx)342 static 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
drm_client_target_preferred(struct drm_connector ** connectors,unsigned int connector_count,struct drm_display_mode ** modes,struct drm_client_offset * offsets,bool * enabled,int width,int height)375 static 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
394 retry:
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
connector_has_possible_crtc(struct drm_connector * connector,struct drm_crtc * crtc)477 static 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
drm_client_pick_crtcs(struct drm_client_dev * client,struct drm_connector ** connectors,unsigned int connector_count,struct drm_crtc ** best_crtcs,struct drm_display_mode ** modes,int n,int width,int height)490 static 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 */
drm_client_firmware_config(struct drm_client_dev * client,struct drm_connector ** connectors,unsigned int connector_count,struct drm_crtc ** crtcs,struct drm_display_mode ** modes,struct drm_client_offset * offsets,bool * enabled,int width,int height)565 static 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 unsigned 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 save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
588 if (!save_enabled)
589 return false;
590
591 drm_modeset_acquire_init(&ctx, 0);
592
593 while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
594 drm_modeset_backoff(&ctx);
595
596 memcpy(save_enabled, enabled, count);
597 mask = GENMASK(count - 1, 0);
598 conn_configured = 0;
599 for (i = 0; i < count; i++) {
600 if (connectors[i]->has_tile &&
601 connectors[i]->status == connector_status_connected)
602 num_tiled_conns++;
603 }
604 retry:
605 conn_seq = conn_configured;
606 for (i = 0; i < count; i++) {
607 struct drm_connector *connector;
608 struct drm_encoder *encoder;
609 struct drm_crtc *new_crtc;
610
611 connector = connectors[i];
612
613 if (conn_configured & BIT(i))
614 continue;
615
616 if (conn_seq == 0 && !connector->has_tile)
617 continue;
618
619 if (connector->status == connector_status_connected)
620 num_connectors_detected++;
621
622 if (!enabled[i]) {
623 DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
624 connector->name);
625 conn_configured |= BIT(i);
626 continue;
627 }
628
629 if (connector->force == DRM_FORCE_OFF) {
630 DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
631 connector->name);
632 enabled[i] = false;
633 continue;
634 }
635
636 encoder = connector->state->best_encoder;
637 if (!encoder || WARN_ON(!connector->state->crtc)) {
638 if (connector->force > DRM_FORCE_OFF)
639 goto bail;
640
641 DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
642 connector->name);
643 enabled[i] = false;
644 conn_configured |= BIT(i);
645 continue;
646 }
647
648 num_connectors_enabled++;
649
650 new_crtc = connector->state->crtc;
651
652 /*
653 * Make sure we're not trying to drive multiple connectors
654 * with a single CRTC, since our cloning support may not
655 * match the BIOS.
656 */
657 for (j = 0; j < count; j++) {
658 if (crtcs[j] == new_crtc) {
659 DRM_DEBUG_KMS("fallback: cloned configuration\n");
660 goto bail;
661 }
662 }
663
664 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
665 connector->name);
666
667 /* go for command line mode first */
668 modes[i] = drm_connector_pick_cmdline_mode(connector);
669
670 /* try for preferred next */
671 if (!modes[i]) {
672 DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
673 connector->name, connector->has_tile);
674 modes[i] = drm_connector_has_preferred_mode(connector, width, height);
675 }
676
677 /* No preferred mode marked by the EDID? Are there any modes? */
678 if (!modes[i] && !list_empty(&connector->modes)) {
679 DRM_DEBUG_KMS("using first mode listed on connector %s\n",
680 connector->name);
681 modes[i] = list_first_entry(&connector->modes,
682 struct drm_display_mode,
683 head);
684 }
685
686 /* last resort: use current mode */
687 if (!modes[i]) {
688 /*
689 * IMPORTANT: We want to use the adjusted mode (i.e.
690 * after the panel fitter upscaling) as the initial
691 * config, not the input mode, which is what crtc->mode
692 * usually contains. But since our current
693 * code puts a mode derived from the post-pfit timings
694 * into crtc->mode this works out correctly.
695 *
696 * This is crtc->mode and not crtc->state->mode for the
697 * fastboot check to work correctly.
698 */
699 DRM_DEBUG_KMS("looking for current mode on connector %s\n",
700 connector->name);
701 modes[i] = &connector->state->crtc->mode;
702 }
703 /*
704 * In case of tiled modes, if all tiles are not present
705 * then fallback to a non tiled mode.
706 */
707 if (connector->has_tile &&
708 num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
709 DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
710 connector->base.id);
711 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
712 }
713 crtcs[i] = new_crtc;
714
715 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
716 connector->name,
717 connector->state->crtc->base.id,
718 connector->state->crtc->name,
719 modes[i]->hdisplay, modes[i]->vdisplay,
720 modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
721
722 fallback = false;
723 conn_configured |= BIT(i);
724 }
725
726 if ((conn_configured & mask) != mask && conn_configured != conn_seq)
727 goto retry;
728
729 /*
730 * If the BIOS didn't enable everything it could, fall back to have the
731 * same user experiencing of lighting up as much as possible like the
732 * fbdev helper library.
733 */
734 if (num_connectors_enabled != num_connectors_detected &&
735 num_connectors_enabled < dev->mode_config.num_crtc) {
736 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
737 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
738 num_connectors_detected);
739 fallback = true;
740 }
741
742 if (fallback) {
743 bail:
744 DRM_DEBUG_KMS("Not using firmware configuration\n");
745 memcpy(enabled, save_enabled, count);
746 ret = false;
747 }
748
749 drm_modeset_drop_locks(&ctx);
750 drm_modeset_acquire_fini(&ctx);
751
752 kfree(save_enabled);
753 return ret;
754 }
755
756 /**
757 * drm_client_modeset_probe() - Probe for displays
758 * @client: DRM client
759 * @width: Maximum display mode width (optional)
760 * @height: Maximum display mode height (optional)
761 *
762 * This function sets up display pipelines for enabled connectors and stores the
763 * config in the client's modeset array.
764 *
765 * Returns:
766 * Zero on success or negative error code on failure.
767 */
drm_client_modeset_probe(struct drm_client_dev * client,unsigned int width,unsigned int height)768 int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
769 {
770 struct drm_connector *connector, **connectors = NULL;
771 struct drm_connector_list_iter conn_iter;
772 struct drm_device *dev = client->dev;
773 unsigned int total_modes_count = 0;
774 struct drm_client_offset *offsets;
775 unsigned int connector_count = 0;
776 struct drm_display_mode **modes;
777 struct drm_crtc **crtcs;
778 int i, ret = 0;
779 bool *enabled;
780
781 DRM_DEBUG_KMS("\n");
782
783 if (!width)
784 width = dev->mode_config.max_width;
785 if (!height)
786 height = dev->mode_config.max_height;
787
788 drm_connector_list_iter_begin(dev, &conn_iter);
789 drm_client_for_each_connector_iter(connector, &conn_iter) {
790 struct drm_connector **tmp;
791
792 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
793 if (!tmp) {
794 ret = -ENOMEM;
795 goto free_connectors;
796 }
797
798 connectors = tmp;
799 drm_connector_get(connector);
800 connectors[connector_count++] = connector;
801 }
802 drm_connector_list_iter_end(&conn_iter);
803
804 if (!connector_count)
805 return 0;
806
807 crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
808 modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
809 offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
810 enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
811 if (!crtcs || !modes || !enabled || !offsets) {
812 DRM_ERROR("Memory allocation failed\n");
813 ret = -ENOMEM;
814 goto out;
815 }
816
817 mutex_lock(&client->modeset_mutex);
818
819 mutex_lock(&dev->mode_config.mutex);
820 for (i = 0; i < connector_count; i++)
821 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
822 if (!total_modes_count)
823 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
824 drm_client_connectors_enabled(connectors, connector_count, enabled);
825
826 if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
827 modes, offsets, enabled, width, height)) {
828 memset(modes, 0, connector_count * sizeof(*modes));
829 memset(crtcs, 0, connector_count * sizeof(*crtcs));
830 memset(offsets, 0, connector_count * sizeof(*offsets));
831
832 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
833 offsets, enabled, width, height) &&
834 !drm_client_target_preferred(connectors, connector_count, modes,
835 offsets, enabled, width, height))
836 DRM_ERROR("Unable to find initial modes\n");
837
838 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
839 width, height);
840
841 drm_client_pick_crtcs(client, connectors, connector_count,
842 crtcs, modes, 0, width, height);
843 }
844 mutex_unlock(&dev->mode_config.mutex);
845
846 drm_client_modeset_release(client);
847
848 for (i = 0; i < connector_count; i++) {
849 struct drm_display_mode *mode = modes[i];
850 struct drm_crtc *crtc = crtcs[i];
851 struct drm_client_offset *offset = &offsets[i];
852
853 if (mode && crtc) {
854 struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
855 struct drm_connector *connector = connectors[i];
856
857 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
858 mode->name, crtc->base.id, offset->x, offset->y);
859
860 if (WARN_ON_ONCE(modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
861 (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
862 ret = -EINVAL;
863 break;
864 }
865
866 modeset->mode = drm_mode_duplicate(dev, mode);
867 drm_connector_get(connector);
868 modeset->connectors[modeset->num_connectors++] = connector;
869 modeset->x = offset->x;
870 modeset->y = offset->y;
871 }
872 }
873
874 mutex_unlock(&client->modeset_mutex);
875 out:
876 kfree(crtcs);
877 kfree(modes);
878 kfree(offsets);
879 kfree(enabled);
880 free_connectors:
881 for (i = 0; i < connector_count; i++)
882 drm_connector_put(connectors[i]);
883 kfree(connectors);
884
885 return ret;
886 }
887 EXPORT_SYMBOL(drm_client_modeset_probe);
888
889 /**
890 * drm_client_rotation() - Check the initial rotation value
891 * @modeset: DRM modeset
892 * @rotation: Returned rotation value
893 *
894 * This function checks if the primary plane in @modeset can hw rotate
895 * to match the rotation needed on its connector.
896 *
897 * Note: Currently only 0 and 180 degrees are supported.
898 *
899 * Return:
900 * True if the plane can do the rotation, false otherwise.
901 */
drm_client_rotation(struct drm_mode_set * modeset,unsigned int * rotation)902 bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
903 {
904 struct drm_connector *connector = modeset->connectors[0];
905 struct drm_plane *plane = modeset->crtc->primary;
906 struct drm_cmdline_mode *cmdline;
907 u64 valid_mask = 0;
908 unsigned int i;
909
910 if (!modeset->num_connectors)
911 return false;
912
913 switch (connector->display_info.panel_orientation) {
914 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
915 *rotation = DRM_MODE_ROTATE_180;
916 break;
917 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
918 *rotation = DRM_MODE_ROTATE_90;
919 break;
920 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
921 *rotation = DRM_MODE_ROTATE_270;
922 break;
923 default:
924 *rotation = DRM_MODE_ROTATE_0;
925 }
926
927 /**
928 * The panel already defined the default rotation
929 * through its orientation. Whatever has been provided
930 * on the command line needs to be added to that.
931 *
932 * Unfortunately, the rotations are at different bit
933 * indices, so the math to add them up are not as
934 * trivial as they could.
935 *
936 * Reflections on the other hand are pretty trivial to deal with, a
937 * simple XOR between the two handle the addition nicely.
938 */
939 cmdline = &connector->cmdline_mode;
940 if (cmdline->specified && cmdline->rotation_reflection) {
941 unsigned int cmdline_rest, panel_rest;
942 unsigned int cmdline_rot, panel_rot;
943 unsigned int sum_rot, sum_rest;
944
945 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
946 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
947 sum_rot = (panel_rot + cmdline_rot) % 4;
948
949 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
950 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
951 sum_rest = panel_rest ^ cmdline_rest;
952
953 *rotation = (1 << sum_rot) | sum_rest;
954 }
955
956 /*
957 * TODO: support 90 / 270 degree hardware rotation,
958 * depending on the hardware this may require the framebuffer
959 * to be in a specific tiling format.
960 */
961 if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
962 (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
963 !plane->rotation_property)
964 return false;
965
966 for (i = 0; i < plane->rotation_property->num_values; i++)
967 valid_mask |= (1ULL << plane->rotation_property->values[i]);
968
969 if (!(*rotation & valid_mask))
970 return false;
971
972 return true;
973 }
974 EXPORT_SYMBOL(drm_client_rotation);
975
drm_client_modeset_commit_atomic(struct drm_client_dev * client,bool active)976 static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active)
977 {
978 struct drm_device *dev = client->dev;
979 struct drm_plane *plane;
980 struct drm_atomic_state *state;
981 struct drm_modeset_acquire_ctx ctx;
982 struct drm_mode_set *mode_set;
983 int ret;
984
985 drm_modeset_acquire_init(&ctx, 0);
986
987 state = drm_atomic_state_alloc(dev);
988 if (!state) {
989 ret = -ENOMEM;
990 goto out_ctx;
991 }
992
993 state->acquire_ctx = &ctx;
994 retry:
995 drm_for_each_plane(plane, dev) {
996 struct drm_plane_state *plane_state;
997
998 plane_state = drm_atomic_get_plane_state(state, plane);
999 if (IS_ERR(plane_state)) {
1000 ret = PTR_ERR(plane_state);
1001 goto out_state;
1002 }
1003
1004 plane_state->rotation = DRM_MODE_ROTATE_0;
1005
1006 /* disable non-primary: */
1007 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1008 continue;
1009
1010 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1011 if (ret != 0)
1012 goto out_state;
1013 }
1014
1015 drm_client_for_each_modeset(mode_set, client) {
1016 struct drm_plane *primary = mode_set->crtc->primary;
1017 unsigned int rotation;
1018
1019 if (drm_client_rotation(mode_set, &rotation)) {
1020 struct drm_plane_state *plane_state;
1021
1022 /* Cannot fail as we've already gotten the plane state above */
1023 plane_state = drm_atomic_get_new_plane_state(state, primary);
1024 plane_state->rotation = rotation;
1025 }
1026
1027 ret = __drm_atomic_helper_set_config(mode_set, state);
1028 if (ret != 0)
1029 goto out_state;
1030
1031 /*
1032 * __drm_atomic_helper_set_config() sets active when a
1033 * mode is set, unconditionally clear it if we force DPMS off
1034 */
1035 if (!active) {
1036 struct drm_crtc *crtc = mode_set->crtc;
1037 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1038
1039 crtc_state->active = false;
1040 }
1041 }
1042
1043 ret = drm_atomic_commit(state);
1044
1045 out_state:
1046 if (ret == -EDEADLK)
1047 goto backoff;
1048
1049 drm_atomic_state_put(state);
1050 out_ctx:
1051 drm_modeset_drop_locks(&ctx);
1052 drm_modeset_acquire_fini(&ctx);
1053
1054 return ret;
1055
1056 backoff:
1057 drm_atomic_state_clear(state);
1058 drm_modeset_backoff(&ctx);
1059
1060 goto retry;
1061 }
1062
drm_client_modeset_commit_legacy(struct drm_client_dev * client)1063 static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1064 {
1065 struct drm_device *dev = client->dev;
1066 struct drm_mode_set *mode_set;
1067 struct drm_plane *plane;
1068 int ret = 0;
1069
1070 drm_modeset_lock_all(dev);
1071 drm_for_each_plane(plane, dev) {
1072 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1073 drm_plane_force_disable(plane);
1074
1075 if (plane->rotation_property)
1076 drm_mode_plane_set_obj_prop(plane,
1077 plane->rotation_property,
1078 DRM_MODE_ROTATE_0);
1079 }
1080
1081 drm_client_for_each_modeset(mode_set, client) {
1082 struct drm_crtc *crtc = mode_set->crtc;
1083
1084 if (crtc->funcs->cursor_set2) {
1085 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1086 if (ret)
1087 goto out;
1088 } else if (crtc->funcs->cursor_set) {
1089 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1090 if (ret)
1091 goto out;
1092 }
1093
1094 ret = drm_mode_set_config_internal(mode_set);
1095 if (ret)
1096 goto out;
1097 }
1098 out:
1099 drm_modeset_unlock_all(dev);
1100
1101 return ret;
1102 }
1103
1104 /**
1105 * drm_client_modeset_commit_force() - Force commit CRTC configuration
1106 * @client: DRM client
1107 *
1108 * Commit modeset configuration to crtcs without checking if there is a DRM master.
1109 *
1110 * Returns:
1111 * Zero on success or negative error code on failure.
1112 */
drm_client_modeset_commit_force(struct drm_client_dev * client)1113 int drm_client_modeset_commit_force(struct drm_client_dev *client)
1114 {
1115 struct drm_device *dev = client->dev;
1116 int ret;
1117
1118 mutex_lock(&client->modeset_mutex);
1119 if (drm_drv_uses_atomic_modeset(dev))
1120 ret = drm_client_modeset_commit_atomic(client, true);
1121 else
1122 ret = drm_client_modeset_commit_legacy(client);
1123 mutex_unlock(&client->modeset_mutex);
1124
1125 return ret;
1126 }
1127 EXPORT_SYMBOL(drm_client_modeset_commit_force);
1128
1129 /**
1130 * drm_client_modeset_commit() - Commit CRTC configuration
1131 * @client: DRM client
1132 *
1133 * Commit modeset configuration to crtcs.
1134 *
1135 * Returns:
1136 * Zero on success or negative error code on failure.
1137 */
drm_client_modeset_commit(struct drm_client_dev * client)1138 int drm_client_modeset_commit(struct drm_client_dev *client)
1139 {
1140 struct drm_device *dev = client->dev;
1141 int ret;
1142
1143 if (!drm_master_internal_acquire(dev))
1144 return -EBUSY;
1145
1146 ret = drm_client_modeset_commit_force(client);
1147
1148 drm_master_internal_release(dev);
1149
1150 return ret;
1151 }
1152 EXPORT_SYMBOL(drm_client_modeset_commit);
1153
drm_client_modeset_dpms_legacy(struct drm_client_dev * client,int dpms_mode)1154 static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1155 {
1156 struct drm_device *dev = client->dev;
1157 struct drm_connector *connector;
1158 struct drm_mode_set *modeset;
1159 int j;
1160
1161 drm_modeset_lock_all(dev);
1162 drm_client_for_each_modeset(modeset, client) {
1163 if (!modeset->crtc->enabled)
1164 continue;
1165
1166 for (j = 0; j < modeset->num_connectors; j++) {
1167 connector = modeset->connectors[j];
1168 connector->funcs->dpms(connector, dpms_mode);
1169 drm_object_property_set_value(&connector->base,
1170 dev->mode_config.dpms_property, dpms_mode);
1171 }
1172 }
1173 drm_modeset_unlock_all(dev);
1174 }
1175
1176 /**
1177 * drm_client_modeset_dpms() - Set DPMS mode
1178 * @client: DRM client
1179 * @mode: DPMS mode
1180 *
1181 * Note: For atomic drivers @mode is reduced to on/off.
1182 *
1183 * Returns:
1184 * Zero on success or negative error code on failure.
1185 */
drm_client_modeset_dpms(struct drm_client_dev * client,int mode)1186 int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1187 {
1188 struct drm_device *dev = client->dev;
1189 int ret = 0;
1190
1191 if (!drm_master_internal_acquire(dev))
1192 return -EBUSY;
1193
1194 mutex_lock(&client->modeset_mutex);
1195 if (drm_drv_uses_atomic_modeset(dev))
1196 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON);
1197 else
1198 drm_client_modeset_dpms_legacy(client, mode);
1199 mutex_unlock(&client->modeset_mutex);
1200
1201 drm_master_internal_release(dev);
1202
1203 return ret;
1204 }
1205 EXPORT_SYMBOL(drm_client_modeset_dpms);
1206