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