56d36779d21321f0e4c74d1606b6952bdee392a9
[sfrench/cifs-2.6.git] / drivers / gpu / drm / drm_client_modeset.c
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 <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13
14 #include <drm/drm_atomic.h>
15 #include <drm/drm_client.h>
16 #include <drm/drm_connector.h>
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_device.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_encoder.h>
21 #include <drm/drm_print.h>
22
23 #include "drm_crtc_internal.h"
24 #include "drm_internal.h"
25
26 #define DRM_CLIENT_MAX_CLONED_CONNECTORS        8
27
28 struct drm_client_offset {
29         int x, y;
30 };
31
32 int drm_client_modeset_create(struct drm_client_dev *client)
33 {
34         struct drm_device *dev = client->dev;
35         unsigned int num_crtc = dev->mode_config.num_crtc;
36         unsigned int max_connector_count = 1;
37         struct drm_mode_set *modeset;
38         struct drm_crtc *crtc;
39         unsigned int i = 0;
40
41         /* Add terminating zero entry to enable index less iteration */
42         client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
43         if (!client->modesets)
44                 return -ENOMEM;
45
46         mutex_init(&client->modeset_mutex);
47
48         drm_for_each_crtc(crtc, dev)
49                 client->modesets[i++].crtc = crtc;
50
51         /* Cloning is only supported in the single crtc case. */
52         if (num_crtc == 1)
53                 max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
54
55         for (modeset = client->modesets; modeset->crtc; modeset++) {
56                 modeset->connectors = kcalloc(max_connector_count,
57                                               sizeof(*modeset->connectors), GFP_KERNEL);
58                 if (!modeset->connectors)
59                         goto err_free;
60         }
61
62         return 0;
63
64 err_free:
65         drm_client_modeset_free(client);
66
67         return -ENOMEM;
68 }
69
70 static void drm_client_modeset_release(struct drm_client_dev *client)
71 {
72         struct drm_mode_set *modeset;
73         unsigned int i;
74
75         drm_client_for_each_modeset(modeset, client) {
76                 drm_mode_destroy(client->dev, modeset->mode);
77                 modeset->mode = NULL;
78                 modeset->fb = NULL;
79
80                 for (i = 0; i < modeset->num_connectors; i++) {
81                         drm_connector_put(modeset->connectors[i]);
82                         modeset->connectors[i] = NULL;
83                 }
84                 modeset->num_connectors = 0;
85         }
86 }
87
88 void drm_client_modeset_free(struct drm_client_dev *client)
89 {
90         struct drm_mode_set *modeset;
91
92         mutex_lock(&client->modeset_mutex);
93
94         drm_client_modeset_release(client);
95
96         drm_client_for_each_modeset(modeset, client)
97                 kfree(modeset->connectors);
98
99         mutex_unlock(&client->modeset_mutex);
100
101         mutex_destroy(&client->modeset_mutex);
102         kfree(client->modesets);
103 }
104
105 static struct drm_mode_set *
106 drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
107 {
108         struct drm_mode_set *modeset;
109
110         drm_client_for_each_modeset(modeset, client)
111                 if (modeset->crtc == crtc)
112                         return modeset;
113
114         return NULL;
115 }
116
117 static struct drm_display_mode *
118 drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
119 {
120         struct drm_display_mode *mode;
121
122         list_for_each_entry(mode, &connector->modes, head) {
123                 if (mode->hdisplay > width ||
124                     mode->vdisplay > height)
125                         continue;
126                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
127                         return mode;
128         }
129         return NULL;
130 }
131
132 static struct drm_display_mode *
133 drm_connector_pick_cmdline_mode(struct drm_connector *connector)
134 {
135         struct drm_cmdline_mode *cmdline_mode;
136         struct drm_display_mode *mode;
137         bool prefer_non_interlace;
138
139         cmdline_mode = &connector->cmdline_mode;
140         if (cmdline_mode->specified == false)
141                 return NULL;
142
143         /* attempt to find a matching mode in the list of modes
144          *  we have gotten so far, if not add a CVT mode that conforms
145          */
146         if (cmdline_mode->rb || cmdline_mode->margins)
147                 goto create_mode;
148
149         prefer_non_interlace = !cmdline_mode->interlace;
150 again:
151         list_for_each_entry(mode, &connector->modes, head) {
152                 /* Check (optional) mode name first */
153                 if (!strcmp(mode->name, cmdline_mode->name))
154                         return mode;
155
156                 /* check width/height */
157                 if (mode->hdisplay != cmdline_mode->xres ||
158                     mode->vdisplay != cmdline_mode->yres)
159                         continue;
160
161                 if (cmdline_mode->refresh_specified) {
162                         if (mode->vrefresh != cmdline_mode->refresh)
163                                 continue;
164                 }
165
166                 if (cmdline_mode->interlace) {
167                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
168                                 continue;
169                 } else if (prefer_non_interlace) {
170                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
171                                 continue;
172                 }
173                 return mode;
174         }
175
176         if (prefer_non_interlace) {
177                 prefer_non_interlace = false;
178                 goto again;
179         }
180
181 create_mode:
182         mode = drm_mode_create_from_cmdline_mode(connector->dev, cmdline_mode);
183         if (mode)
184                 list_add(&mode->head, &connector->modes);
185
186         return mode;
187 }
188
189 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
190 {
191         bool enable;
192
193         if (connector->display_info.non_desktop)
194                 return false;
195
196         if (strict)
197                 enable = connector->status == connector_status_connected;
198         else
199                 enable = connector->status != connector_status_disconnected;
200
201         return enable;
202 }
203
204 static void drm_client_connectors_enabled(struct drm_connector **connectors,
205                                           unsigned int connector_count,
206                                           bool *enabled)
207 {
208         bool any_enabled = false;
209         struct drm_connector *connector;
210         int i = 0;
211
212         for (i = 0; i < connector_count; i++) {
213                 connector = connectors[i];
214                 enabled[i] = drm_connector_enabled(connector, true);
215                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
216                               connector->display_info.non_desktop ? "non desktop" : enabled[i] ? "yes" : "no");
217
218                 any_enabled |= enabled[i];
219         }
220
221         if (any_enabled)
222                 return;
223
224         for (i = 0; i < connector_count; i++)
225                 enabled[i] = drm_connector_enabled(connectors[i], false);
226 }
227
228 static bool drm_client_target_cloned(struct drm_device *dev,
229                                      struct drm_connector **connectors,
230                                      unsigned int connector_count,
231                                      struct drm_display_mode **modes,
232                                      struct drm_client_offset *offsets,
233                                      bool *enabled, int width, int height)
234 {
235         int count, i, j;
236         bool can_clone = false;
237         struct drm_display_mode *dmt_mode, *mode;
238
239         /* only contemplate cloning in the single crtc case */
240         if (dev->mode_config.num_crtc > 1)
241                 return false;
242
243         count = 0;
244         for (i = 0; i < connector_count; i++) {
245                 if (enabled[i])
246                         count++;
247         }
248
249         /* only contemplate cloning if more than one connector is enabled */
250         if (count <= 1)
251                 return false;
252
253         /* check the command line or if nothing common pick 1024x768 */
254         can_clone = true;
255         for (i = 0; i < connector_count; i++) {
256                 if (!enabled[i])
257                         continue;
258                 modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
259                 if (!modes[i]) {
260                         can_clone = false;
261                         break;
262                 }
263                 for (j = 0; j < i; j++) {
264                         if (!enabled[j])
265                                 continue;
266                         if (!drm_mode_match(modes[j], modes[i],
267                                             DRM_MODE_MATCH_TIMINGS |
268                                             DRM_MODE_MATCH_CLOCK |
269                                             DRM_MODE_MATCH_FLAGS |
270                                             DRM_MODE_MATCH_3D_FLAGS))
271                                 can_clone = false;
272                 }
273         }
274
275         if (can_clone) {
276                 DRM_DEBUG_KMS("can clone using command line\n");
277                 return true;
278         }
279
280         /* try and find a 1024x768 mode on each connector */
281         can_clone = true;
282         dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
283
284         for (i = 0; i < connector_count; i++) {
285                 if (!enabled[i])
286                         continue;
287
288                 list_for_each_entry(mode, &connectors[i]->modes, head) {
289                         if (drm_mode_match(mode, dmt_mode,
290                                            DRM_MODE_MATCH_TIMINGS |
291                                            DRM_MODE_MATCH_CLOCK |
292                                            DRM_MODE_MATCH_FLAGS |
293                                            DRM_MODE_MATCH_3D_FLAGS))
294                                 modes[i] = mode;
295                 }
296                 if (!modes[i])
297                         can_clone = false;
298         }
299
300         if (can_clone) {
301                 DRM_DEBUG_KMS("can clone using 1024x768\n");
302                 return true;
303         }
304         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
305         return false;
306 }
307
308 static int drm_client_get_tile_offsets(struct drm_connector **connectors,
309                                        unsigned int connector_count,
310                                        struct drm_display_mode **modes,
311                                        struct drm_client_offset *offsets,
312                                        int idx,
313                                        int h_idx, int v_idx)
314 {
315         struct drm_connector *connector;
316         int i;
317         int hoffset = 0, voffset = 0;
318
319         for (i = 0; i < connector_count; i++) {
320                 connector = connectors[i];
321                 if (!connector->has_tile)
322                         continue;
323
324                 if (!modes[i] && (h_idx || v_idx)) {
325                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
326                                       connector->base.id);
327                         continue;
328                 }
329                 if (connector->tile_h_loc < h_idx)
330                         hoffset += modes[i]->hdisplay;
331
332                 if (connector->tile_v_loc < v_idx)
333                         voffset += modes[i]->vdisplay;
334         }
335         offsets[idx].x = hoffset;
336         offsets[idx].y = voffset;
337         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
338         return 0;
339 }
340
341 static bool drm_client_target_preferred(struct drm_connector **connectors,
342                                         unsigned int connector_count,
343                                         struct drm_display_mode **modes,
344                                         struct drm_client_offset *offsets,
345                                         bool *enabled, int width, int height)
346 {
347         const u64 mask = BIT_ULL(connector_count) - 1;
348         struct drm_connector *connector;
349         u64 conn_configured = 0;
350         int tile_pass = 0;
351         int i;
352
353 retry:
354         for (i = 0; i < connector_count; i++) {
355                 connector = connectors[i];
356
357                 if (conn_configured & BIT_ULL(i))
358                         continue;
359
360                 if (enabled[i] == false) {
361                         conn_configured |= BIT_ULL(i);
362                         continue;
363                 }
364
365                 /* first pass over all the untiled connectors */
366                 if (tile_pass == 0 && connector->has_tile)
367                         continue;
368
369                 if (tile_pass == 1) {
370                         if (connector->tile_h_loc != 0 ||
371                             connector->tile_v_loc != 0)
372                                 continue;
373
374                 } else {
375                         if (connector->tile_h_loc != tile_pass - 1 &&
376                             connector->tile_v_loc != tile_pass - 1)
377                         /* if this tile_pass doesn't cover any of the tiles - keep going */
378                                 continue;
379
380                         /*
381                          * find the tile offsets for this pass - need to find
382                          * all tiles left and above
383                          */
384                         drm_client_get_tile_offsets(connectors, connector_count, modes, offsets, i,
385                                                     connector->tile_h_loc, connector->tile_v_loc);
386                 }
387                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
388                               connector->base.id);
389
390                 /* got for command line mode first */
391                 modes[i] = drm_connector_pick_cmdline_mode(connector);
392                 if (!modes[i]) {
393                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
394                                       connector->base.id, connector->tile_group ? connector->tile_group->id : 0);
395                         modes[i] = drm_connector_has_preferred_mode(connector, width, height);
396                 }
397                 /* No preferred modes, pick one off the list */
398                 if (!modes[i] && !list_empty(&connector->modes)) {
399                         list_for_each_entry(modes[i], &connector->modes, head)
400                                 break;
401                 }
402                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
403                           "none");
404                 conn_configured |= BIT_ULL(i);
405         }
406
407         if ((conn_configured & mask) != mask) {
408                 tile_pass++;
409                 goto retry;
410         }
411         return true;
412 }
413
414 static bool connector_has_possible_crtc(struct drm_connector *connector,
415                                         struct drm_crtc *crtc)
416 {
417         struct drm_encoder *encoder;
418         int i;
419
420         drm_connector_for_each_possible_encoder(connector, encoder, i) {
421                 if (encoder->possible_crtcs & drm_crtc_mask(crtc))
422                         return true;
423         }
424
425         return false;
426 }
427
428 static int drm_client_pick_crtcs(struct drm_client_dev *client,
429                                  struct drm_connector **connectors,
430                                  unsigned int connector_count,
431                                  struct drm_crtc **best_crtcs,
432                                  struct drm_display_mode **modes,
433                                  int n, int width, int height)
434 {
435         struct drm_device *dev = client->dev;
436         struct drm_connector *connector;
437         int my_score, best_score, score;
438         struct drm_crtc **crtcs, *crtc;
439         struct drm_mode_set *modeset;
440         int o;
441
442         if (n == connector_count)
443                 return 0;
444
445         connector = connectors[n];
446
447         best_crtcs[n] = NULL;
448         best_score = drm_client_pick_crtcs(client, connectors, connector_count,
449                                            best_crtcs, modes, n + 1, width, height);
450         if (modes[n] == NULL)
451                 return best_score;
452
453         crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
454         if (!crtcs)
455                 return best_score;
456
457         my_score = 1;
458         if (connector->status == connector_status_connected)
459                 my_score++;
460         if (connector->cmdline_mode.specified)
461                 my_score++;
462         if (drm_connector_has_preferred_mode(connector, width, height))
463                 my_score++;
464
465         /*
466          * select a crtc for this connector and then attempt to configure
467          * remaining connectors
468          */
469         drm_client_for_each_modeset(modeset, client) {
470                 crtc = modeset->crtc;
471
472                 if (!connector_has_possible_crtc(connector, crtc))
473                         continue;
474
475                 for (o = 0; o < n; o++)
476                         if (best_crtcs[o] == crtc)
477                                 break;
478
479                 if (o < n) {
480                         /* ignore cloning unless only a single crtc */
481                         if (dev->mode_config.num_crtc > 1)
482                                 continue;
483
484                         if (!drm_mode_equal(modes[o], modes[n]))
485                                 continue;
486                 }
487
488                 crtcs[n] = crtc;
489                 memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
490                 score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
491                                                          crtcs, modes, n + 1, width, height);
492                 if (score > best_score) {
493                         best_score = score;
494                         memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
495                 }
496         }
497
498         kfree(crtcs);
499         return best_score;
500 }
501
502 /* Try to read the BIOS display configuration and use it for the initial config */
503 static bool drm_client_firmware_config(struct drm_client_dev *client,
504                                        struct drm_connector **connectors,
505                                        unsigned int connector_count,
506                                        struct drm_crtc **crtcs,
507                                        struct drm_display_mode **modes,
508                                        struct drm_client_offset *offsets,
509                                        bool *enabled, int width, int height)
510 {
511         unsigned int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
512         unsigned long conn_configured, conn_seq, mask;
513         struct drm_device *dev = client->dev;
514         int i, j;
515         bool *save_enabled;
516         bool fallback = true, ret = true;
517         int num_connectors_enabled = 0;
518         int num_connectors_detected = 0;
519         struct drm_modeset_acquire_ctx ctx;
520
521         if (!drm_drv_uses_atomic_modeset(dev))
522                 return false;
523
524         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
525         if (!save_enabled)
526                 return false;
527
528         drm_modeset_acquire_init(&ctx, 0);
529
530         while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
531                 drm_modeset_backoff(&ctx);
532
533         memcpy(save_enabled, enabled, count);
534         mask = GENMASK(count - 1, 0);
535         conn_configured = 0;
536 retry:
537         conn_seq = conn_configured;
538         for (i = 0; i < count; i++) {
539                 struct drm_connector *connector;
540                 struct drm_encoder *encoder;
541                 struct drm_crtc *new_crtc;
542
543                 connector = connectors[i];
544
545                 if (conn_configured & BIT(i))
546                         continue;
547
548                 if (conn_seq == 0 && !connector->has_tile)
549                         continue;
550
551                 if (connector->status == connector_status_connected)
552                         num_connectors_detected++;
553
554                 if (!enabled[i]) {
555                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
556                                       connector->name);
557                         conn_configured |= BIT(i);
558                         continue;
559                 }
560
561                 if (connector->force == DRM_FORCE_OFF) {
562                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
563                                       connector->name);
564                         enabled[i] = false;
565                         continue;
566                 }
567
568                 encoder = connector->state->best_encoder;
569                 if (!encoder || WARN_ON(!connector->state->crtc)) {
570                         if (connector->force > DRM_FORCE_OFF)
571                                 goto bail;
572
573                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
574                                       connector->name);
575                         enabled[i] = false;
576                         conn_configured |= BIT(i);
577                         continue;
578                 }
579
580                 num_connectors_enabled++;
581
582                 new_crtc = connector->state->crtc;
583
584                 /*
585                  * Make sure we're not trying to drive multiple connectors
586                  * with a single CRTC, since our cloning support may not
587                  * match the BIOS.
588                  */
589                 for (j = 0; j < count; j++) {
590                         if (crtcs[j] == new_crtc) {
591                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
592                                 goto bail;
593                         }
594                 }
595
596                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
597                               connector->name);
598
599                 /* go for command line mode first */
600                 modes[i] = drm_connector_pick_cmdline_mode(connector);
601
602                 /* try for preferred next */
603                 if (!modes[i]) {
604                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
605                                       connector->name, connector->has_tile);
606                         modes[i] = drm_connector_has_preferred_mode(connector, width, height);
607                 }
608
609                 /* No preferred mode marked by the EDID? Are there any modes? */
610                 if (!modes[i] && !list_empty(&connector->modes)) {
611                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
612                                       connector->name);
613                         modes[i] = list_first_entry(&connector->modes,
614                                                     struct drm_display_mode,
615                                                     head);
616                 }
617
618                 /* last resort: use current mode */
619                 if (!modes[i]) {
620                         /*
621                          * IMPORTANT: We want to use the adjusted mode (i.e.
622                          * after the panel fitter upscaling) as the initial
623                          * config, not the input mode, which is what crtc->mode
624                          * usually contains. But since our current
625                          * code puts a mode derived from the post-pfit timings
626                          * into crtc->mode this works out correctly.
627                          *
628                          * This is crtc->mode and not crtc->state->mode for the
629                          * fastboot check to work correctly.
630                          */
631                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
632                                       connector->name);
633                         modes[i] = &connector->state->crtc->mode;
634                 }
635                 crtcs[i] = new_crtc;
636
637                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
638                               connector->name,
639                               connector->state->crtc->base.id,
640                               connector->state->crtc->name,
641                               modes[i]->hdisplay, modes[i]->vdisplay,
642                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
643
644                 fallback = false;
645                 conn_configured |= BIT(i);
646         }
647
648         if ((conn_configured & mask) != mask && conn_configured != conn_seq)
649                 goto retry;
650
651         /*
652          * If the BIOS didn't enable everything it could, fall back to have the
653          * same user experiencing of lighting up as much as possible like the
654          * fbdev helper library.
655          */
656         if (num_connectors_enabled != num_connectors_detected &&
657             num_connectors_enabled < dev->mode_config.num_crtc) {
658                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
659                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
660                               num_connectors_detected);
661                 fallback = true;
662         }
663
664         if (fallback) {
665 bail:
666                 DRM_DEBUG_KMS("Not using firmware configuration\n");
667                 memcpy(enabled, save_enabled, count);
668                 ret = false;
669         }
670
671         drm_modeset_drop_locks(&ctx);
672         drm_modeset_acquire_fini(&ctx);
673
674         kfree(save_enabled);
675         return ret;
676 }
677
678 /**
679  * drm_client_modeset_probe() - Probe for displays
680  * @client: DRM client
681  * @width: Maximum display mode width (optional)
682  * @height: Maximum display mode height (optional)
683  *
684  * This function sets up display pipelines for enabled connectors and stores the
685  * config in the client's modeset array.
686  *
687  * Returns:
688  * Zero on success or negative error code on failure.
689  */
690 int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
691 {
692         struct drm_connector *connector, **connectors = NULL;
693         struct drm_connector_list_iter conn_iter;
694         struct drm_device *dev = client->dev;
695         unsigned int total_modes_count = 0;
696         struct drm_client_offset *offsets;
697         unsigned int connector_count = 0;
698         struct drm_display_mode **modes;
699         struct drm_crtc **crtcs;
700         int i, ret = 0;
701         bool *enabled;
702
703         DRM_DEBUG_KMS("\n");
704
705         if (!width)
706                 width = dev->mode_config.max_width;
707         if (!height)
708                 height = dev->mode_config.max_height;
709
710         drm_connector_list_iter_begin(dev, &conn_iter);
711         drm_client_for_each_connector_iter(connector, &conn_iter) {
712                 struct drm_connector **tmp;
713
714                 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
715                 if (!tmp) {
716                         ret = -ENOMEM;
717                         goto free_connectors;
718                 }
719
720                 connectors = tmp;
721                 drm_connector_get(connector);
722                 connectors[connector_count++] = connector;
723         }
724         drm_connector_list_iter_end(&conn_iter);
725
726         if (!connector_count)
727                 return 0;
728
729         crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
730         modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
731         offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
732         enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
733         if (!crtcs || !modes || !enabled || !offsets) {
734                 DRM_ERROR("Memory allocation failed\n");
735                 ret = -ENOMEM;
736                 goto out;
737         }
738
739         mutex_lock(&client->modeset_mutex);
740
741         mutex_lock(&dev->mode_config.mutex);
742         for (i = 0; i < connector_count; i++)
743                 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
744         if (!total_modes_count)
745                 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
746         drm_client_connectors_enabled(connectors, connector_count, enabled);
747
748         if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
749                                         modes, offsets, enabled, width, height)) {
750                 memset(modes, 0, connector_count * sizeof(*modes));
751                 memset(crtcs, 0, connector_count * sizeof(*crtcs));
752                 memset(offsets, 0, connector_count * sizeof(*offsets));
753
754                 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
755                                               offsets, enabled, width, height) &&
756                     !drm_client_target_preferred(connectors, connector_count, modes,
757                                                  offsets, enabled, width, height))
758                         DRM_ERROR("Unable to find initial modes\n");
759
760                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
761                               width, height);
762
763                 drm_client_pick_crtcs(client, connectors, connector_count,
764                                       crtcs, modes, 0, width, height);
765         }
766         mutex_unlock(&dev->mode_config.mutex);
767
768         drm_client_modeset_release(client);
769
770         for (i = 0; i < connector_count; i++) {
771                 struct drm_display_mode *mode = modes[i];
772                 struct drm_crtc *crtc = crtcs[i];
773                 struct drm_client_offset *offset = &offsets[i];
774
775                 if (mode && crtc) {
776                         struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
777                         struct drm_connector *connector = connectors[i];
778
779                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
780                                       mode->name, crtc->base.id, offset->x, offset->y);
781
782                         if (WARN_ON_ONCE(modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
783                                          (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
784                                 ret = -EINVAL;
785                                 break;
786                         }
787
788                         modeset->mode = drm_mode_duplicate(dev, mode);
789                         drm_connector_get(connector);
790                         modeset->connectors[modeset->num_connectors++] = connector;
791                         modeset->x = offset->x;
792                         modeset->y = offset->y;
793                 }
794         }
795
796         mutex_unlock(&client->modeset_mutex);
797 out:
798         kfree(crtcs);
799         kfree(modes);
800         kfree(offsets);
801         kfree(enabled);
802 free_connectors:
803         for (i = 0; i < connector_count; i++)
804                 drm_connector_put(connectors[i]);
805         kfree(connectors);
806
807         return ret;
808 }
809 EXPORT_SYMBOL(drm_client_modeset_probe);
810
811 /**
812  * drm_client_rotation() - Check the initial rotation value
813  * @modeset: DRM modeset
814  * @rotation: Returned rotation value
815  *
816  * This function checks if the primary plane in @modeset can hw rotate
817  * to match the rotation needed on its connector.
818  *
819  * Note: Currently only 0 and 180 degrees are supported.
820  *
821  * Return:
822  * True if the plane can do the rotation, false otherwise.
823  */
824 bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
825 {
826         struct drm_connector *connector = modeset->connectors[0];
827         struct drm_plane *plane = modeset->crtc->primary;
828         struct drm_cmdline_mode *cmdline;
829         u64 valid_mask = 0;
830         unsigned int i;
831
832         if (!modeset->num_connectors)
833                 return false;
834
835         switch (connector->display_info.panel_orientation) {
836         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
837                 *rotation = DRM_MODE_ROTATE_180;
838                 break;
839         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
840                 *rotation = DRM_MODE_ROTATE_90;
841                 break;
842         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
843                 *rotation = DRM_MODE_ROTATE_270;
844                 break;
845         default:
846                 *rotation = DRM_MODE_ROTATE_0;
847         }
848
849         /**
850          * The panel already defined the default rotation
851          * through its orientation. Whatever has been provided
852          * on the command line needs to be added to that.
853          *
854          * Unfortunately, the rotations are at different bit
855          * indices, so the math to add them up are not as
856          * trivial as they could.
857          *
858          * Reflections on the other hand are pretty trivial to deal with, a
859          * simple XOR between the two handle the addition nicely.
860          */
861         cmdline = &connector->cmdline_mode;
862         if (cmdline->specified) {
863                 unsigned int cmdline_rest, panel_rest;
864                 unsigned int cmdline_rot, panel_rot;
865                 unsigned int sum_rot, sum_rest;
866
867                 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
868                 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
869                 sum_rot = (panel_rot + cmdline_rot) % 4;
870
871                 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
872                 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
873                 sum_rest = panel_rest ^ cmdline_rest;
874
875                 *rotation = (1 << sum_rot) | sum_rest;
876         }
877
878         /*
879          * TODO: support 90 / 270 degree hardware rotation,
880          * depending on the hardware this may require the framebuffer
881          * to be in a specific tiling format.
882          */
883         if ((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180 ||
884             !plane->rotation_property)
885                 return false;
886
887         for (i = 0; i < plane->rotation_property->num_values; i++)
888                 valid_mask |= (1ULL << plane->rotation_property->values[i]);
889
890         if (!(*rotation & valid_mask))
891                 return false;
892
893         return true;
894 }
895 EXPORT_SYMBOL(drm_client_rotation);
896
897 static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active)
898 {
899         struct drm_device *dev = client->dev;
900         struct drm_plane *plane;
901         struct drm_atomic_state *state;
902         struct drm_modeset_acquire_ctx ctx;
903         struct drm_mode_set *mode_set;
904         int ret;
905
906         drm_modeset_acquire_init(&ctx, 0);
907
908         state = drm_atomic_state_alloc(dev);
909         if (!state) {
910                 ret = -ENOMEM;
911                 goto out_ctx;
912         }
913
914         state->acquire_ctx = &ctx;
915 retry:
916         drm_for_each_plane(plane, dev) {
917                 struct drm_plane_state *plane_state;
918
919                 plane_state = drm_atomic_get_plane_state(state, plane);
920                 if (IS_ERR(plane_state)) {
921                         ret = PTR_ERR(plane_state);
922                         goto out_state;
923                 }
924
925                 plane_state->rotation = DRM_MODE_ROTATE_0;
926
927                 /* disable non-primary: */
928                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
929                         continue;
930
931                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
932                 if (ret != 0)
933                         goto out_state;
934         }
935
936         drm_client_for_each_modeset(mode_set, client) {
937                 struct drm_plane *primary = mode_set->crtc->primary;
938                 unsigned int rotation;
939
940                 if (drm_client_rotation(mode_set, &rotation)) {
941                         struct drm_plane_state *plane_state;
942
943                         /* Cannot fail as we've already gotten the plane state above */
944                         plane_state = drm_atomic_get_new_plane_state(state, primary);
945                         plane_state->rotation = rotation;
946                 }
947
948                 ret = __drm_atomic_helper_set_config(mode_set, state);
949                 if (ret != 0)
950                         goto out_state;
951
952                 /*
953                  * __drm_atomic_helper_set_config() sets active when a
954                  * mode is set, unconditionally clear it if we force DPMS off
955                  */
956                 if (!active) {
957                         struct drm_crtc *crtc = mode_set->crtc;
958                         struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
959
960                         crtc_state->active = false;
961                 }
962         }
963
964         ret = drm_atomic_commit(state);
965
966 out_state:
967         if (ret == -EDEADLK)
968                 goto backoff;
969
970         drm_atomic_state_put(state);
971 out_ctx:
972         drm_modeset_drop_locks(&ctx);
973         drm_modeset_acquire_fini(&ctx);
974
975         return ret;
976
977 backoff:
978         drm_atomic_state_clear(state);
979         drm_modeset_backoff(&ctx);
980
981         goto retry;
982 }
983
984 static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
985 {
986         struct drm_device *dev = client->dev;
987         struct drm_mode_set *mode_set;
988         struct drm_plane *plane;
989         int ret = 0;
990
991         drm_modeset_lock_all(dev);
992         drm_for_each_plane(plane, dev) {
993                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
994                         drm_plane_force_disable(plane);
995
996                 if (plane->rotation_property)
997                         drm_mode_plane_set_obj_prop(plane,
998                                                     plane->rotation_property,
999                                                     DRM_MODE_ROTATE_0);
1000         }
1001
1002         drm_client_for_each_modeset(mode_set, client) {
1003                 struct drm_crtc *crtc = mode_set->crtc;
1004
1005                 if (crtc->funcs->cursor_set2) {
1006                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1007                         if (ret)
1008                                 goto out;
1009                 } else if (crtc->funcs->cursor_set) {
1010                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1011                         if (ret)
1012                                 goto out;
1013                 }
1014
1015                 ret = drm_mode_set_config_internal(mode_set);
1016                 if (ret)
1017                         goto out;
1018         }
1019 out:
1020         drm_modeset_unlock_all(dev);
1021
1022         return ret;
1023 }
1024
1025 /**
1026  * drm_client_modeset_commit_force() - Force commit CRTC configuration
1027  * @client: DRM client
1028  *
1029  * Commit modeset configuration to crtcs without checking if there is a DRM master.
1030  *
1031  * Returns:
1032  * Zero on success or negative error code on failure.
1033  */
1034 int drm_client_modeset_commit_force(struct drm_client_dev *client)
1035 {
1036         struct drm_device *dev = client->dev;
1037         int ret;
1038
1039         mutex_lock(&client->modeset_mutex);
1040         if (drm_drv_uses_atomic_modeset(dev))
1041                 ret = drm_client_modeset_commit_atomic(client, true);
1042         else
1043                 ret = drm_client_modeset_commit_legacy(client);
1044         mutex_unlock(&client->modeset_mutex);
1045
1046         return ret;
1047 }
1048 EXPORT_SYMBOL(drm_client_modeset_commit_force);
1049
1050 /**
1051  * drm_client_modeset_commit() - Commit CRTC configuration
1052  * @client: DRM client
1053  *
1054  * Commit modeset configuration to crtcs.
1055  *
1056  * Returns:
1057  * Zero on success or negative error code on failure.
1058  */
1059 int drm_client_modeset_commit(struct drm_client_dev *client)
1060 {
1061         struct drm_device *dev = client->dev;
1062         int ret;
1063
1064         if (!drm_master_internal_acquire(dev))
1065                 return -EBUSY;
1066
1067         ret = drm_client_modeset_commit_force(client);
1068
1069         drm_master_internal_release(dev);
1070
1071         return ret;
1072 }
1073 EXPORT_SYMBOL(drm_client_modeset_commit);
1074
1075 static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1076 {
1077         struct drm_device *dev = client->dev;
1078         struct drm_connector *connector;
1079         struct drm_mode_set *modeset;
1080         int j;
1081
1082         drm_modeset_lock_all(dev);
1083         drm_client_for_each_modeset(modeset, client) {
1084                 if (!modeset->crtc->enabled)
1085                         continue;
1086
1087                 for (j = 0; j < modeset->num_connectors; j++) {
1088                         connector = modeset->connectors[j];
1089                         connector->funcs->dpms(connector, dpms_mode);
1090                         drm_object_property_set_value(&connector->base,
1091                                 dev->mode_config.dpms_property, dpms_mode);
1092                 }
1093         }
1094         drm_modeset_unlock_all(dev);
1095 }
1096
1097 /**
1098  * drm_client_modeset_dpms() - Set DPMS mode
1099  * @client: DRM client
1100  * @mode: DPMS mode
1101  *
1102  * Note: For atomic drivers @mode is reduced to on/off.
1103  *
1104  * Returns:
1105  * Zero on success or negative error code on failure.
1106  */
1107 int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1108 {
1109         struct drm_device *dev = client->dev;
1110         int ret = 0;
1111
1112         if (!drm_master_internal_acquire(dev))
1113                 return -EBUSY;
1114
1115         mutex_lock(&client->modeset_mutex);
1116         if (drm_drv_uses_atomic_modeset(dev))
1117                 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON);
1118         else
1119                 drm_client_modeset_dpms_legacy(client, mode);
1120         mutex_unlock(&client->modeset_mutex);
1121
1122         drm_master_internal_release(dev);
1123
1124         return ret;
1125 }
1126 EXPORT_SYMBOL(drm_client_modeset_dpms);