drivers/gpu/drm/drm_client_modeset.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2018 Noralf Trønnes
   4  * Copyright (c) 2006-2009 Red Hat Inc.
   5  * Copyright (c) 2006-2008 Intel Corporation
   6  *   Jesse Barnes <[email protected]>
   7  * Copyright (c) 2007 Dave Airlie <[email protected]>
   8  */
   9
  10 #include "drm/drm_modeset_lock.h"
  11 #include <linux/module.h>
  12 #include <linux/mutex.h>
  13 #include <linux/slab.h>
  14 #include <linux/string_helpers.h>
  15
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_client.h>
  18 #include <drm/drm_connector.h>
  19 #include <drm/drm_crtc.h>
  20 #include <drm/drm_device.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_edid.h>
  23 #include <drm/drm_encoder.h>
  24 #include <drm/drm_print.h>
  25
  26 #include "drm_crtc_internal.h"
  27 #include "drm_internal.h"
  28
  29 #define DRM_CLIENT_MAX_CLONED_CONNECTORS        8
  30
  31 struct drm_client_offset {
  32         int x, y;
  33 };
  34
  35 int drm_client_modeset_create(struct drm_client_dev *client)
  36 {
  37         struct drm_device *dev = client->dev;
  38         unsigned int num_crtc = dev->mode_config.num_crtc;
  39         unsigned int max_connector_count = 1;
  40         struct drm_mode_set *modeset;
  41         struct drm_crtc *crtc;
  42         unsigned int i = 0;
  43
  44         /* Add terminating zero entry to enable index less iteration */
  45         client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
  46         if (!client->modesets)
  47                 return -ENOMEM;
  48
  49         mutex_init(&client->modeset_mutex);
  50
  51         drm_for_each_crtc(crtc, dev)
  52                 client->modesets[i++].crtc = crtc;
  53
  54         /* Cloning is only supported in the single crtc case. */
  55         if (num_crtc == 1)
  56                 max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
  57
  58         for (modeset = client->modesets; modeset->crtc; modeset++) {
  59                 modeset->connectors = kcalloc(max_connector_count,
  60                                               sizeof(*modeset->connectors), GFP_KERNEL);
  61                 if (!modeset->connectors)
  62                         goto err_free;
  63         }
  64
  65         return 0;
  66
  67 err_free:
  68         drm_client_modeset_free(client);
  69
  70         return -ENOMEM;
  71 }
  72
  73 static void drm_client_modeset_release(struct drm_client_dev *client)
  74 {
  75         struct drm_mode_set *modeset;
  76         unsigned int i;
  77
  78         drm_client_for_each_modeset(modeset, client) {
  79                 drm_mode_destroy(client->dev, modeset->mode);
  80                 modeset->mode = NULL;
  81                 modeset->fb = NULL;
  82
  83                 for (i = 0; i < modeset->num_connectors; i++) {
  84                         drm_connector_put(modeset->connectors[i]);
  85                         modeset->connectors[i] = NULL;
  86                 }
  87                 modeset->num_connectors = 0;
  88         }
  89 }
  90
  91 void drm_client_modeset_free(struct drm_client_dev *client)
  92 {
  93         struct drm_mode_set *modeset;
  94
  95         mutex_lock(&client->modeset_mutex);
  96
  97         drm_client_modeset_release(client);
  98
  99         drm_client_for_each_modeset(modeset, client)
 100                 kfree(modeset->connectors);
 101
 102         mutex_unlock(&client->modeset_mutex);
 103
 104         mutex_destroy(&client->modeset_mutex);
 105         kfree(client->modesets);
 106 }
 107
 108 static struct drm_mode_set *
 109 drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
 110 {
 111         struct drm_mode_set *modeset;
 112
 113         drm_client_for_each_modeset(modeset, client)
 114                 if (modeset->crtc == crtc)
 115                         return modeset;
 116
 117         return NULL;
 118 }
 119
 120 static struct drm_display_mode *
 121 drm_connector_get_tiled_mode(struct drm_connector *connector)
 122 {
 123         struct drm_display_mode *mode;
 124
 125         list_for_each_entry(mode, &connector->modes, head) {
 126                 if (mode->hdisplay == connector->tile_h_size &&
 127                     mode->vdisplay == connector->tile_v_size)
 128                         return mode;
 129         }
 130         return NULL;
 131 }
 132
 133 static struct drm_display_mode *
 134 drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
 135 {
 136         struct drm_display_mode *mode;
 137
 138         list_for_each_entry(mode, &connector->modes, head) {
 139                 if (mode->hdisplay == connector->tile_h_size &&
 140                     mode->vdisplay == connector->tile_v_size)
 141                         continue;
 142                 return mode;
 143         }
 144         return NULL;
 145 }
 146
 147 static struct drm_display_mode *
 148 drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
 149 {
 150         struct drm_display_mode *mode;
 151
 152         list_for_each_entry(mode, &connector->modes, head) {
 153                 if (mode->hdisplay > width ||
 154                     mode->vdisplay > height)
 155                         continue;
 156                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 157                         return mode;
 158         }
 159         return NULL;
 160 }
 161
 162 static struct drm_display_mode *drm_connector_pick_cmdline_mode(struct drm_connector *connector)
 163 {
 164         struct drm_cmdline_mode *cmdline_mode;
 165         struct drm_display_mode *mode;
 166         bool prefer_non_interlace;
 167
 168         /*
 169          * Find a user-defined mode. If the user gave us a valid
 170          * mode on the kernel command line, it will show up in this
 171          * list.
 172          */
 173
 174         list_for_each_entry(mode, &connector->modes, head) {
 175                 if (mode->type & DRM_MODE_TYPE_USERDEF)
 176                         return mode;
 177         }
 178
 179         cmdline_mode = &connector->cmdline_mode;
 180         if (cmdline_mode->specified == false)
 181                 return NULL;
 182
 183         /*
 184          * Attempt to find a matching mode in the list of modes we
 185          * have gotten so far.
 186          */
 187
 188         prefer_non_interlace = !cmdline_mode->interlace;
 189 again:
 190         list_for_each_entry(mode, &connector->modes, head) {
 191                 /* check width/height */
 192                 if (mode->hdisplay != cmdline_mode->xres ||
 193                     mode->vdisplay != cmdline_mode->yres)
 194                         continue;
 195
 196                 if (cmdline_mode->refresh_specified) {
 197                         if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
 198                                 continue;
 199                 }
 200
 201                 if (cmdline_mode->interlace) {
 202                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 203                                 continue;
 204                 } else if (prefer_non_interlace) {
 205                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 206                                 continue;
 207                 }
 208                 return mode;
 209         }
 210
 211         if (prefer_non_interlace) {
 212                 prefer_non_interlace = false;
 213                 goto again;
 214         }
 215
 216         return NULL;
 217 }
 218
 219 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 220 {
 221         bool enable;
 222
 223         if (connector->display_info.non_desktop)
 224                 return false;
 225
 226         if (strict)
 227                 enable = connector->status == connector_status_connected;
 228         else
 229                 enable = connector->status != connector_status_disconnected;
 230
 231         return enable;
 232 }
 233
 234 static void drm_client_connectors_enabled(struct drm_connector **connectors,
 235                                           unsigned int connector_count,
 236                                           bool *enabled)
 237 {
 238         bool any_enabled = false;
 239         struct drm_connector *connector;
 240         int i = 0;
 241
 242         for (i = 0; i < connector_count; i++) {
 243                 connector = connectors[i];
 244                 enabled[i] = drm_connector_enabled(connector, true);
 245                 drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] enabled? %s\n",
 246                             connector->base.id, connector->name,
 247                             connector->display_info.non_desktop ?
 248                             "non desktop" : str_yes_no(enabled[i]));
 249
 250                 any_enabled |= enabled[i];
 251         }
 252
 253         if (any_enabled)
 254                 return;
 255
 256         for (i = 0; i < connector_count; i++)
 257                 enabled[i] = drm_connector_enabled(connectors[i], false);
 258 }
 259
 260 static bool drm_client_target_cloned(struct drm_device *dev,
 261                                      struct drm_connector **connectors,
 262                                      unsigned int connector_count,
 263                                      struct drm_display_mode **modes,
 264                                      struct drm_client_offset *offsets,
 265                                      bool *enabled, int width, int height)
 266 {
 267         int count, i, j;
 268         bool can_clone = false;
 269         struct drm_display_mode *dmt_mode, *mode;
 270
 271         /* only contemplate cloning in the single crtc case */
 272         if (dev->mode_config.num_crtc > 1)
 273                 return false;
 274
 275         count = 0;
 276         for (i = 0; i < connector_count; i++) {
 277                 if (enabled[i])
 278                         count++;
 279         }
 280
 281         /* only contemplate cloning if more than one connector is enabled */
 282         if (count <= 1)
 283                 return false;
 284
 285         /* check the command line or if nothing common pick 1024x768 */
 286         can_clone = true;
 287         for (i = 0; i < connector_count; i++) {
 288                 if (!enabled[i])
 289                         continue;
 290                 modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
 291                 if (!modes[i]) {
 292                         can_clone = false;
 293                         break;
 294                 }
 295                 for (j = 0; j < i; j++) {
 296                         if (!enabled[j])
 297                                 continue;
 298                         if (!drm_mode_match(modes[j], modes[i],
 299                                             DRM_MODE_MATCH_TIMINGS |
 300                                             DRM_MODE_MATCH_CLOCK |
 301                                             DRM_MODE_MATCH_FLAGS |
 302                                             DRM_MODE_MATCH_3D_FLAGS))
 303                                 can_clone = false;
 304                 }
 305         }
 306
 307         if (can_clone) {
 308                 drm_dbg_kms(dev, "can clone using command line\n");
 309                 return true;
 310         }
 311
 312         /* try and find a 1024x768 mode on each connector */
 313         can_clone = true;
 314         dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
 315
 316         if (!dmt_mode)
 317                 goto fail;
 318
 319         for (i = 0; i < connector_count; i++) {
 320                 if (!enabled[i])
 321                         continue;
 322
 323                 list_for_each_entry(mode, &connectors[i]->modes, head) {
 324                         if (drm_mode_match(mode, dmt_mode,
 325                                            DRM_MODE_MATCH_TIMINGS |
 326                                            DRM_MODE_MATCH_CLOCK |
 327                                            DRM_MODE_MATCH_FLAGS |
 328                                            DRM_MODE_MATCH_3D_FLAGS))
 329                                 modes[i] = mode;
 330                 }
 331                 if (!modes[i])
 332                         can_clone = false;
 333         }
 334         kfree(dmt_mode);
 335
 336         if (can_clone) {
 337                 drm_dbg_kms(dev, "can clone using 1024x768\n");
 338                 return true;
 339         }
 340 fail:
 341         drm_info(dev, "kms: can't enable cloning when we probably wanted to.\n");
 342         return false;
 343 }
 344
 345 static int drm_client_get_tile_offsets(struct drm_device *dev,
 346                                        struct drm_connector **connectors,
 347                                        unsigned int connector_count,
 348                                        struct drm_display_mode **modes,
 349                                        struct drm_client_offset *offsets,
 350                                        int idx,
 351                                        int h_idx, int v_idx)
 352 {
 353         struct drm_connector *connector;
 354         int i;
 355         int hoffset = 0, voffset = 0;
 356
 357         for (i = 0; i < connector_count; i++) {
 358                 connector = connectors[i];
 359                 if (!connector->has_tile)
 360                         continue;
 361
 362                 if (!modes[i] && (h_idx || v_idx)) {
 363                         drm_dbg_kms(dev,
 364                                     "[CONNECTOR:%d:%s] no modes for connector tiled %d\n",
 365                                     connector->base.id, connector->name, i);
 366                         continue;
 367                 }
 368                 if (connector->tile_h_loc < h_idx)
 369                         hoffset += modes[i]->hdisplay;
 370
 371                 if (connector->tile_v_loc < v_idx)
 372                         voffset += modes[i]->vdisplay;
 373         }
 374         offsets[idx].x = hoffset;
 375         offsets[idx].y = voffset;
 376         drm_dbg_kms(dev, "returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
 377         return 0;
 378 }
 379
 380 static bool drm_client_target_preferred(struct drm_device *dev,
 381                                         struct drm_connector **connectors,
 382                                         unsigned int connector_count,
 383                                         struct drm_display_mode **modes,
 384                                         struct drm_client_offset *offsets,
 385                                         bool *enabled, int width, int height)
 386 {
 387         const u64 mask = BIT_ULL(connector_count) - 1;
 388         struct drm_connector *connector;
 389         u64 conn_configured = 0;
 390         int tile_pass = 0;
 391         int num_tiled_conns = 0;
 392         int i;
 393
 394         for (i = 0; i < connector_count; i++) {
 395                 if (connectors[i]->has_tile &&
 396                     connectors[i]->status == connector_status_connected)
 397                         num_tiled_conns++;
 398         }
 399
 400 retry:
 401         for (i = 0; i < connector_count; i++) {
 402                 connector = connectors[i];
 403
 404                 if (conn_configured & BIT_ULL(i))
 405                         continue;
 406
 407                 if (enabled[i] == false) {
 408                         conn_configured |= BIT_ULL(i);
 409                         continue;
 410                 }
 411
 412                 /* first pass over all the untiled connectors */
 413                 if (tile_pass == 0 && connector->has_tile)
 414                         continue;
 415
 416                 if (tile_pass == 1) {
 417                         if (connector->tile_h_loc != 0 ||
 418                             connector->tile_v_loc != 0)
 419                                 continue;
 420
 421                 } else {
 422                         if (connector->tile_h_loc != tile_pass - 1 &&
 423                             connector->tile_v_loc != tile_pass - 1)
 424                         /* if this tile_pass doesn't cover any of the tiles - keep going */
 425                                 continue;
 426
 427                         /*
 428                          * find the tile offsets for this pass - need to find
 429                          * all tiles left and above
 430                          */
 431                         drm_client_get_tile_offsets(dev, connectors, connector_count,
 432                                                     modes, offsets, i,
 433                                                     connector->tile_h_loc, connector->tile_v_loc);
 434                 }
 435                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for cmdline mode\n",
 436                             connector->base.id, connector->name);
 437
 438                 /* got for command line mode first */
 439                 modes[i] = drm_connector_pick_cmdline_mode(connector);
 440                 if (!modes[i]) {
 441                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for preferred mode, tile %d\n",
 442                                     connector->base.id, connector->name,
 443                                     connector->tile_group ? connector->tile_group->id : 0);
 444                         modes[i] = drm_connector_has_preferred_mode(connector, width, height);
 445                 }
 446                 /* No preferred modes, pick one off the list */
 447                 if (!modes[i] && !list_empty(&connector->modes)) {
 448                         list_for_each_entry(modes[i], &connector->modes, head)
 449                                 break;
 450                 }
 451                 /*
 452                  * In case of tiled mode if all tiles not present fallback to
 453                  * first available non tiled mode.
 454                  * After all tiles are present, try to find the tiled mode
 455                  * for all and if tiled mode not present due to fbcon size
 456                  * limitations, use first non tiled mode only for
 457                  * tile 0,0 and set to no mode for all other tiles.
 458                  */
 459                 if (connector->has_tile) {
 460                         if (num_tiled_conns <
 461                             connector->num_h_tile * connector->num_v_tile ||
 462                             (connector->tile_h_loc == 0 &&
 463                              connector->tile_v_loc == 0 &&
 464                              !drm_connector_get_tiled_mode(connector))) {
 465                                 drm_dbg_kms(dev,
 466                                             "[CONNECTOR:%d:%s] Falling back to non-tiled mode\n",
 467                                             connector->base.id, connector->name);
 468                                 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
 469                         } else {
 470                                 modes[i] = drm_connector_get_tiled_mode(connector);
 471                         }
 472                 }
 473
 474                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Found mode %s\n",
 475                             connector->base.id, connector->name,
 476                             modes[i] ? modes[i]->name : "none");
 477                 conn_configured |= BIT_ULL(i);
 478         }
 479
 480         if ((conn_configured & mask) != mask) {
 481                 tile_pass++;
 482                 goto retry;
 483         }
 484         return true;
 485 }
 486
 487 static bool connector_has_possible_crtc(struct drm_connector *connector,
 488                                         struct drm_crtc *crtc)
 489 {
 490         struct drm_encoder *encoder;
 491
 492         drm_connector_for_each_possible_encoder(connector, encoder) {
 493                 if (encoder->possible_crtcs & drm_crtc_mask(crtc))
 494                         return true;
 495         }
 496
 497         return false;
 498 }
 499
 500 static int drm_client_pick_crtcs(struct drm_client_dev *client,
 501                                  struct drm_connector **connectors,
 502                                  unsigned int connector_count,
 503                                  struct drm_crtc **best_crtcs,
 504                                  struct drm_display_mode **modes,
 505                                  int n, int width, int height)
 506 {
 507         struct drm_device *dev = client->dev;
 508         struct drm_connector *connector;
 509         int my_score, best_score, score;
 510         struct drm_crtc **crtcs, *crtc;
 511         struct drm_mode_set *modeset;
 512         int o;
 513
 514         if (n == connector_count)
 515                 return 0;
 516
 517         connector = connectors[n];
 518
 519         best_crtcs[n] = NULL;
 520         best_score = drm_client_pick_crtcs(client, connectors, connector_count,
 521                                            best_crtcs, modes, n + 1, width, height);
 522         if (modes[n] == NULL)
 523                 return best_score;
 524
 525         crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
 526         if (!crtcs)
 527                 return best_score;
 528
 529         my_score = 1;
 530         if (connector->status == connector_status_connected)
 531                 my_score++;
 532         if (connector->cmdline_mode.specified)
 533                 my_score++;
 534         if (drm_connector_has_preferred_mode(connector, width, height))
 535                 my_score++;
 536
 537         /*
 538          * select a crtc for this connector and then attempt to configure
 539          * remaining connectors
 540          */
 541         drm_client_for_each_modeset(modeset, client) {
 542                 crtc = modeset->crtc;
 543
 544                 if (!connector_has_possible_crtc(connector, crtc))
 545                         continue;
 546
 547                 for (o = 0; o < n; o++)
 548                         if (best_crtcs[o] == crtc)
 549                                 break;
 550
 551                 if (o < n) {
 552                         /* ignore cloning unless only a single crtc */
 553                         if (dev->mode_config.num_crtc > 1)
 554                                 continue;
 555
 556                         if (!drm_mode_equal(modes[o], modes[n]))
 557                                 continue;
 558                 }
 559
 560                 crtcs[n] = crtc;
 561                 memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
 562                 score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
 563                                                          crtcs, modes, n + 1, width, height);
 564                 if (score > best_score) {
 565                         best_score = score;
 566                         memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
 567                 }
 568         }
 569
 570         kfree(crtcs);
 571         return best_score;
 572 }
 573
 574 /* Try to read the BIOS display configuration and use it for the initial config */
 575 static bool drm_client_firmware_config(struct drm_client_dev *client,
 576                                        struct drm_connector **connectors,
 577                                        unsigned int connector_count,
 578                                        struct drm_crtc **crtcs,
 579                                        struct drm_display_mode **modes,
 580                                        struct drm_client_offset *offsets,
 581                                        bool *enabled, int width, int height)
 582 {
 583         const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
 584         unsigned long conn_configured, conn_seq, mask;
 585         struct drm_device *dev = client->dev;
 586         int i, j;
 587         bool *save_enabled;
 588         bool fallback = true, ret = true;
 589         int num_connectors_enabled = 0;
 590         int num_connectors_detected = 0;
 591         int num_tiled_conns = 0;
 592         struct drm_modeset_acquire_ctx ctx;
 593
 594         if (!drm_drv_uses_atomic_modeset(dev))
 595                 return false;
 596
 597         if (drm_WARN_ON(dev, count <= 0))
 598                 return false;
 599
 600         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 601         if (!save_enabled)
 602                 return false;
 603
 604         drm_modeset_acquire_init(&ctx, 0);
 605
 606         while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
 607                 drm_modeset_backoff(&ctx);
 608
 609         memcpy(save_enabled, enabled, count);
 610         mask = GENMASK(count - 1, 0);
 611         conn_configured = 0;
 612         for (i = 0; i < count; i++) {
 613                 if (connectors[i]->has_tile &&
 614                     connectors[i]->status == connector_status_connected)
 615                         num_tiled_conns++;
 616         }
 617 retry:
 618         conn_seq = conn_configured;
 619         for (i = 0; i < count; i++) {
 620                 struct drm_connector *connector;
 621                 struct drm_encoder *encoder;
 622                 struct drm_crtc *new_crtc;
 623
 624                 connector = connectors[i];
 625
 626                 if (conn_configured & BIT(i))
 627                         continue;
 628
 629                 if (conn_seq == 0 && !connector->has_tile)
 630                         continue;
 631
 632                 if (connector->status == connector_status_connected)
 633                         num_connectors_detected++;
 634
 635                 if (!enabled[i]) {
 636                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] not enabled, skipping\n",
 637                                     connector->base.id, connector->name);
 638                         conn_configured |= BIT(i);
 639                         continue;
 640                 }
 641
 642                 if (connector->force == DRM_FORCE_OFF) {
 643                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] disabled by user, skipping\n",
 644                                     connector->base.id, connector->name);
 645                         enabled[i] = false;
 646                         continue;
 647                 }
 648
 649                 encoder = connector->state->best_encoder;
 650                 if (!encoder || drm_WARN_ON(dev, !connector->state->crtc)) {
 651                         if (connector->force > DRM_FORCE_OFF)
 652                                 goto bail;
 653
 654                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] has no encoder or crtc, skipping\n",
 655                                     connector->base.id, connector->name);
 656                         enabled[i] = false;
 657                         conn_configured |= BIT(i);
 658                         continue;
 659                 }
 660
 661                 num_connectors_enabled++;
 662
 663                 new_crtc = connector->state->crtc;
 664
 665                 /*
 666                  * Make sure we're not trying to drive multiple connectors
 667                  * with a single CRTC, since our cloning support may not
 668                  * match the BIOS.
 669                  */
 670                 for (j = 0; j < count; j++) {
 671                         if (crtcs[j] == new_crtc) {
 672                                 drm_dbg_kms(dev, "fallback: cloned configuration\n");
 673                                 goto bail;
 674                         }
 675                 }
 676
 677                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for cmdline mode\n",
 678                             connector->base.id, connector->name);
 679
 680                 /* go for command line mode first */
 681                 modes[i] = drm_connector_pick_cmdline_mode(connector);
 682
 683                 /* try for preferred next */
 684                 if (!modes[i]) {
 685                         drm_dbg_kms(dev,
 686                                     "[CONNECTOR:%d:%s] looking for preferred mode, has tile: %s\n",
 687                                     connector->base.id, connector->name,
 688                                     str_yes_no(connector->has_tile));
 689                         modes[i] = drm_connector_has_preferred_mode(connector, width, height);
 690                 }
 691
 692                 /* No preferred mode marked by the EDID? Are there any modes? */
 693                 if (!modes[i] && !list_empty(&connector->modes)) {
 694                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] using first listed mode\n",
 695                                     connector->base.id, connector->name);
 696                         modes[i] = list_first_entry(&connector->modes,
 697                                                     struct drm_display_mode,
 698                                                     head);
 699                 }
 700
 701                 /* last resort: use current mode */
 702                 if (!modes[i]) {
 703                         /*
 704                          * IMPORTANT: We want to use the adjusted mode (i.e.
 705                          * after the panel fitter upscaling) as the initial
 706                          * config, not the input mode, which is what crtc->mode
 707                          * usually contains. But since our current
 708                          * code puts a mode derived from the post-pfit timings
 709                          * into crtc->mode this works out correctly.
 710                          *
 711                          * This is crtc->mode and not crtc->state->mode for the
 712                          * fastboot check to work correctly.
 713                          */
 714                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for current mode\n",
 715                                     connector->base.id, connector->name);
 716                         modes[i] = &connector->state->crtc->mode;
 717                 }
 718                 /*
 719                  * In case of tiled modes, if all tiles are not present
 720                  * then fallback to a non tiled mode.
 721                  */
 722                 if (connector->has_tile &&
 723                     num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
 724                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Falling back to non-tiled mode\n",
 725                                     connector->base.id, connector->name);
 726                         modes[i] = drm_connector_fallback_non_tiled_mode(connector);
 727                 }
 728                 crtcs[i] = new_crtc;
 729
 730                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] on [CRTC:%d:%s]: %dx%d%s\n",
 731                             connector->base.id, connector->name,
 732                             connector->state->crtc->base.id,
 733                             connector->state->crtc->name,
 734                             modes[i]->hdisplay, modes[i]->vdisplay,
 735                             modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
 736
 737                 fallback = false;
 738                 conn_configured |= BIT(i);
 739         }
 740
 741         if ((conn_configured & mask) != mask && conn_configured != conn_seq)
 742                 goto retry;
 743
 744         /*
 745          * If the BIOS didn't enable everything it could, fall back to have the
 746          * same user experiencing of lighting up as much as possible like the
 747          * fbdev helper library.
 748          */
 749         if (num_connectors_enabled != num_connectors_detected &&
 750             num_connectors_enabled < dev->mode_config.num_crtc) {
 751                 drm_dbg_kms(dev, "fallback: Not all outputs enabled\n");
 752                 drm_dbg_kms(dev, "Enabled: %i, detected: %i\n",
 753                             num_connectors_enabled, num_connectors_detected);
 754                 fallback = true;
 755         }
 756
 757         if (fallback) {
 758 bail:
 759                 drm_dbg_kms(dev, "Not using firmware configuration\n");
 760                 memcpy(enabled, save_enabled, count);
 761                 ret = false;
 762         }
 763
 764         drm_modeset_drop_locks(&ctx);
 765         drm_modeset_acquire_fini(&ctx);
 766
 767         kfree(save_enabled);
 768         return ret;
 769 }
 770
 771 /**
 772  * drm_client_modeset_probe() - Probe for displays
 773  * @client: DRM client
 774  * @width: Maximum display mode width (optional)
 775  * @height: Maximum display mode height (optional)
 776  *
 777  * This function sets up display pipelines for enabled connectors and stores the
 778  * config in the client's modeset array.
 779  *
 780  * Returns:
 781  * Zero on success or negative error code on failure.
 782  */
 783 int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
 784 {
 785         struct drm_connector *connector, **connectors = NULL;
 786         struct drm_connector_list_iter conn_iter;
 787         struct drm_device *dev = client->dev;
 788         unsigned int total_modes_count = 0;
 789         struct drm_client_offset *offsets;
 790         unsigned int connector_count = 0;
 791         /* points to modes protected by mode_config.mutex */
 792         struct drm_display_mode **modes;
 793         struct drm_crtc **crtcs;
 794         int i, ret = 0;
 795         bool *enabled;
 796
 797         drm_dbg_kms(dev, "\n");
 798
 799         if (!width)
 800                 width = dev->mode_config.max_width;
 801         if (!height)
 802                 height = dev->mode_config.max_height;
 803
 804         drm_connector_list_iter_begin(dev, &conn_iter);
 805         drm_client_for_each_connector_iter(connector, &conn_iter) {
 806                 struct drm_connector **tmp;
 807
 808                 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
 809                 if (!tmp) {
 810                         ret = -ENOMEM;
 811                         goto free_connectors;
 812                 }
 813
 814                 connectors = tmp;
 815                 drm_connector_get(connector);
 816                 connectors[connector_count++] = connector;
 817         }
 818         drm_connector_list_iter_end(&conn_iter);
 819
 820         if (!connector_count)
 821                 return 0;
 822
 823         crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
 824         modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
 825         offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
 826         enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
 827         if (!crtcs || !modes || !enabled || !offsets) {
 828                 ret = -ENOMEM;
 829                 goto out;
 830         }
 831
 832         mutex_lock(&client->modeset_mutex);
 833
 834         mutex_lock(&dev->mode_config.mutex);
 835         for (i = 0; i < connector_count; i++)
 836                 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
 837         if (!total_modes_count)
 838                 drm_dbg_kms(dev, "No connectors reported connected with modes\n");
 839         drm_client_connectors_enabled(connectors, connector_count, enabled);
 840
 841         if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
 842                                         modes, offsets, enabled, width, height)) {
 843                 memset(modes, 0, connector_count * sizeof(*modes));
 844                 memset(crtcs, 0, connector_count * sizeof(*crtcs));
 845                 memset(offsets, 0, connector_count * sizeof(*offsets));
 846
 847                 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
 848                                               offsets, enabled, width, height) &&
 849                     !drm_client_target_preferred(dev, connectors, connector_count, modes,
 850                                                  offsets, enabled, width, height))
 851                         drm_err(dev, "Unable to find initial modes\n");
 852
 853                 drm_dbg_kms(dev, "picking CRTCs for %dx%d config\n",
 854                             width, height);
 855
 856                 drm_client_pick_crtcs(client, connectors, connector_count,
 857                                       crtcs, modes, 0, width, height);
 858         }
 859
 860         drm_client_modeset_release(client);
 861
 862         for (i = 0; i < connector_count; i++) {
 863                 struct drm_display_mode *mode = modes[i];
 864                 struct drm_crtc *crtc = crtcs[i];
 865                 struct drm_client_offset *offset = &offsets[i];
 866
 867                 if (mode && crtc) {
 868                         struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
 869                         struct drm_connector *connector = connectors[i];
 870
 871                         drm_dbg_kms(dev, "[CRTC:%d:%s] desired mode %s set (%d,%d)\n",
 872                                     crtc->base.id, crtc->name,
 873                                     mode->name, offset->x, offset->y);
 874
 875                         if (drm_WARN_ON_ONCE(dev, modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
 876                                              (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
 877                                 ret = -EINVAL;
 878                                 break;
 879                         }
 880
 881                         kfree(modeset->mode);
 882                         modeset->mode = drm_mode_duplicate(dev, mode);
 883                         drm_connector_get(connector);
 884                         modeset->connectors[modeset->num_connectors++] = connector;
 885                         modeset->x = offset->x;
 886                         modeset->y = offset->y;
 887                 }
 888         }
 889         mutex_unlock(&dev->mode_config.mutex);
 890
 891         mutex_unlock(&client->modeset_mutex);
 892 out:
 893         kfree(crtcs);
 894         kfree(modes);
 895         kfree(offsets);
 896         kfree(enabled);
 897 free_connectors:
 898         for (i = 0; i < connector_count; i++)
 899                 drm_connector_put(connectors[i]);
 900         kfree(connectors);
 901
 902         return ret;
 903 }
 904 EXPORT_SYMBOL(drm_client_modeset_probe);
 905
 906 /**
 907  * drm_client_rotation() - Check the initial rotation value
 908  * @modeset: DRM modeset
 909  * @rotation: Returned rotation value
 910  *
 911  * This function checks if the primary plane in @modeset can hw rotate
 912  * to match the rotation needed on its connector.
 913  *
 914  * Note: Currently only 0 and 180 degrees are supported.
 915  *
 916  * Return:
 917  * True if the plane can do the rotation, false otherwise.
 918  */
 919 bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
 920 {
 921         struct drm_connector *connector = modeset->connectors[0];
 922         struct drm_plane *plane = modeset->crtc->primary;
 923         struct drm_cmdline_mode *cmdline;
 924         u64 valid_mask = 0;
 925         unsigned int i;
 926
 927         if (!modeset->num_connectors)
 928                 return false;
 929
 930         switch (connector->display_info.panel_orientation) {
 931         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 932                 *rotation = DRM_MODE_ROTATE_180;
 933                 break;
 934         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 935                 *rotation = DRM_MODE_ROTATE_90;
 936                 break;
 937         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 938                 *rotation = DRM_MODE_ROTATE_270;
 939                 break;
 940         default:
 941                 *rotation = DRM_MODE_ROTATE_0;
 942         }
 943
 944         /**
 945          * The panel already defined the default rotation
 946          * through its orientation. Whatever has been provided
 947          * on the command line needs to be added to that.
 948          *
 949          * Unfortunately, the rotations are at different bit
 950          * indices, so the math to add them up are not as
 951          * trivial as they could.
 952          *
 953          * Reflections on the other hand are pretty trivial to deal with, a
 954          * simple XOR between the two handle the addition nicely.
 955          */
 956         cmdline = &connector->cmdline_mode;
 957         if (cmdline->specified && cmdline->rotation_reflection) {
 958                 unsigned int cmdline_rest, panel_rest;
 959                 unsigned int cmdline_rot, panel_rot;
 960                 unsigned int sum_rot, sum_rest;
 961
 962                 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
 963                 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
 964                 sum_rot = (panel_rot + cmdline_rot) % 4;
 965
 966                 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
 967                 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
 968                 sum_rest = panel_rest ^ cmdline_rest;
 969
 970                 *rotation = (1 << sum_rot) | sum_rest;
 971         }
 972
 973         /*
 974          * TODO: support 90 / 270 degree hardware rotation,
 975          * depending on the hardware this may require the framebuffer
 976          * to be in a specific tiling format.
 977          */
 978         if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
 979              (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
 980             !plane->rotation_property)
 981                 return false;
 982
 983         for (i = 0; i < plane->rotation_property->num_values; i++)
 984                 valid_mask |= (1ULL << plane->rotation_property->values[i]);
 985
 986         if (!(*rotation & valid_mask))
 987                 return false;
 988
 989         return true;
 990 }
 991 EXPORT_SYMBOL(drm_client_rotation);
 992
 993 static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
 994 {
 995         struct drm_device *dev = client->dev;
 996         struct drm_plane *plane;
 997         struct drm_atomic_state *state;
 998         struct drm_modeset_acquire_ctx ctx;
 999         struct drm_mode_set *mode_set;
1000         int ret;
1001
1002         drm_modeset_acquire_init(&ctx, 0);
1003
1004         state = drm_atomic_state_alloc(dev);
1005         if (!state) {
1006                 ret = -ENOMEM;
1007                 goto out_ctx;
1008         }
1009
1010         state->acquire_ctx = &ctx;
1011 retry:
1012         drm_for_each_plane(plane, dev) {
1013                 struct drm_plane_state *plane_state;
1014
1015                 plane_state = drm_atomic_get_plane_state(state, plane);
1016                 if (IS_ERR(plane_state)) {
1017                         ret = PTR_ERR(plane_state);
1018                         goto out_state;
1019                 }
1020
1021                 plane_state->rotation = DRM_MODE_ROTATE_0;
1022
1023                 /* disable non-primary: */
1024                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1025                         continue;
1026
1027                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1028                 if (ret != 0)
1029                         goto out_state;
1030         }
1031
1032         drm_client_for_each_modeset(mode_set, client) {
1033                 struct drm_plane *primary = mode_set->crtc->primary;
1034                 unsigned int rotation;
1035
1036                 if (drm_client_rotation(mode_set, &rotation)) {
1037                         struct drm_plane_state *plane_state;
1038
1039                         /* Cannot fail as we've already gotten the plane state above */
1040                         plane_state = drm_atomic_get_new_plane_state(state, primary);
1041                         plane_state->rotation = rotation;
1042                 }
1043
1044                 ret = __drm_atomic_helper_set_config(mode_set, state);
1045                 if (ret != 0)
1046                         goto out_state;
1047
1048                 /*
1049                  * __drm_atomic_helper_set_config() sets active when a
1050                  * mode is set, unconditionally clear it if we force DPMS off
1051                  */
1052                 if (!active) {
1053                         struct drm_crtc *crtc = mode_set->crtc;
1054                         struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1055
1056                         crtc_state->active = false;
1057                 }
1058         }
1059
1060         if (check)
1061                 ret = drm_atomic_check_only(state);
1062         else
1063                 ret = drm_atomic_commit(state);
1064
1065 out_state:
1066         if (ret == -EDEADLK)
1067                 goto backoff;
1068
1069         drm_atomic_state_put(state);
1070 out_ctx:
1071         drm_modeset_drop_locks(&ctx);
1072         drm_modeset_acquire_fini(&ctx);
1073
1074         return ret;
1075
1076 backoff:
1077         drm_atomic_state_clear(state);
1078         drm_modeset_backoff(&ctx);
1079
1080         goto retry;
1081 }
1082
1083 static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1084 {
1085         struct drm_device *dev = client->dev;
1086         struct drm_mode_set *mode_set;
1087         struct drm_plane *plane;
1088         int ret = 0;
1089
1090         drm_modeset_lock_all(dev);
1091         drm_for_each_plane(plane, dev) {
1092                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1093                         drm_plane_force_disable(plane);
1094
1095                 if (plane->rotation_property)
1096                         drm_mode_plane_set_obj_prop(plane,
1097                                                     plane->rotation_property,
1098                                                     DRM_MODE_ROTATE_0);
1099         }
1100
1101         drm_client_for_each_modeset(mode_set, client) {
1102                 struct drm_crtc *crtc = mode_set->crtc;
1103
1104                 if (crtc->funcs->cursor_set2) {
1105                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1106                         if (ret)
1107                                 goto out;
1108                 } else if (crtc->funcs->cursor_set) {
1109                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1110                         if (ret)
1111                                 goto out;
1112                 }
1113
1114                 ret = drm_mode_set_config_internal(mode_set);
1115                 if (ret)
1116                         goto out;
1117         }
1118 out:
1119         drm_modeset_unlock_all(dev);
1120
1121         return ret;
1122 }
1123
1124 /**
1125  * drm_client_modeset_check() - Check modeset configuration
1126  * @client: DRM client
1127  *
1128  * Check modeset configuration.
1129  *
1130  * Returns:
1131  * Zero on success or negative error code on failure.
1132  */
1133 int drm_client_modeset_check(struct drm_client_dev *client)
1134 {
1135         int ret;
1136
1137         if (!drm_drv_uses_atomic_modeset(client->dev))
1138                 return 0;
1139
1140         mutex_lock(&client->modeset_mutex);
1141         ret = drm_client_modeset_commit_atomic(client, true, true);
1142         mutex_unlock(&client->modeset_mutex);
1143
1144         return ret;
1145 }
1146 EXPORT_SYMBOL(drm_client_modeset_check);
1147
1148 /**
1149  * drm_client_modeset_commit_locked() - Force commit CRTC configuration
1150  * @client: DRM client
1151  *
1152  * Commit modeset configuration to crtcs without checking if there is a DRM
1153  * master. The assumption is that the caller already holds an internal DRM
1154  * master reference acquired with drm_master_internal_acquire().
1155  *
1156  * Returns:
1157  * Zero on success or negative error code on failure.
1158  */
1159 int drm_client_modeset_commit_locked(struct drm_client_dev *client)
1160 {
1161         struct drm_device *dev = client->dev;
1162         int ret;
1163
1164         mutex_lock(&client->modeset_mutex);
1165         if (drm_drv_uses_atomic_modeset(dev))
1166                 ret = drm_client_modeset_commit_atomic(client, true, false);
1167         else
1168                 ret = drm_client_modeset_commit_legacy(client);
1169         mutex_unlock(&client->modeset_mutex);
1170
1171         return ret;
1172 }
1173 EXPORT_SYMBOL(drm_client_modeset_commit_locked);
1174
1175 /**
1176  * drm_client_modeset_commit() - Commit CRTC configuration
1177  * @client: DRM client
1178  *
1179  * Commit modeset configuration to crtcs.
1180  *
1181  * Returns:
1182  * Zero on success or negative error code on failure.
1183  */
1184 int drm_client_modeset_commit(struct drm_client_dev *client)
1185 {
1186         struct drm_device *dev = client->dev;
1187         int ret;
1188
1189         if (!drm_master_internal_acquire(dev))
1190                 return -EBUSY;
1191
1192         ret = drm_client_modeset_commit_locked(client);
1193
1194         drm_master_internal_release(dev);
1195
1196         return ret;
1197 }
1198 EXPORT_SYMBOL(drm_client_modeset_commit);
1199
1200 static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1201 {
1202         struct drm_device *dev = client->dev;
1203         struct drm_connector *connector;
1204         struct drm_mode_set *modeset;
1205         struct drm_modeset_acquire_ctx ctx;
1206         int j;
1207         int ret;
1208
1209         DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
1210         drm_client_for_each_modeset(modeset, client) {
1211                 if (!modeset->crtc->enabled)
1212                         continue;
1213
1214                 for (j = 0; j < modeset->num_connectors; j++) {
1215                         connector = modeset->connectors[j];
1216                         connector->funcs->dpms(connector, dpms_mode);
1217                         drm_object_property_set_value(&connector->base,
1218                                 dev->mode_config.dpms_property, dpms_mode);
1219                 }
1220         }
1221         DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
1222 }
1223
1224 /**
1225  * drm_client_modeset_dpms() - Set DPMS mode
1226  * @client: DRM client
1227  * @mode: DPMS mode
1228  *
1229  * Note: For atomic drivers @mode is reduced to on/off.
1230  *
1231  * Returns:
1232  * Zero on success or negative error code on failure.
1233  */
1234 int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1235 {
1236         struct drm_device *dev = client->dev;
1237         int ret = 0;
1238
1239         if (!drm_master_internal_acquire(dev))
1240                 return -EBUSY;
1241
1242         mutex_lock(&client->modeset_mutex);
1243         if (drm_drv_uses_atomic_modeset(dev))
1244                 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
1245         else
1246                 drm_client_modeset_dpms_legacy(client, mode);
1247         mutex_unlock(&client->modeset_mutex);
1248
1249         drm_master_internal_release(dev);
1250
1251         return ret;
1252 }
1253 EXPORT_SYMBOL(drm_client_modeset_dpms);
1254
1255 #ifdef CONFIG_DRM_KUNIT_TEST
1256 #include "tests/drm_client_modeset_test.c"
1257 #endif