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