drivers/gpu/drm/drm_client_modeset.c

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