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