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