drivers/gpu/drm/drm_atomic_helper.c

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Copyright (C) 2014 Intel Corp.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  * Rob Clark <robdclark@gmail.com>
  25  * Daniel Vetter <daniel.vetter@ffwll.ch>
  26  */
  27
  28 #include <drm/drmP.h>
  29 #include <drm/drm_atomic.h>
  30 #include <drm/drm_plane_helper.h>
  31 #include <drm/drm_crtc_helper.h>
  32 #include <drm/drm_atomic_helper.h>
  33 #include <linux/fence.h>
  34
  35 static void
  36 drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
  37                                 struct drm_plane_state *plane_state,
  38                                 struct drm_plane *plane)
  39 {
  40         struct drm_crtc_state *crtc_state;
  41
  42         if (plane->state->crtc) {
  43                 crtc_state = state->crtc_states[drm_crtc_index(plane->crtc)];
  44
  45                 if (WARN_ON(!crtc_state))
  46                         return;
  47
  48                 crtc_state->planes_changed = true;
  49         }
  50
  51         if (plane_state->crtc) {
  52                 crtc_state =
  53                         state->crtc_states[drm_crtc_index(plane_state->crtc)];
  54
  55                 if (WARN_ON(!crtc_state))
  56                         return;
  57
  58                 crtc_state->planes_changed = true;
  59         }
  60 }
  61
  62 static struct drm_crtc *
  63 get_current_crtc_for_encoder(struct drm_device *dev,
  64                              struct drm_encoder *encoder)
  65 {
  66         struct drm_mode_config *config = &dev->mode_config;
  67         struct drm_connector *connector;
  68
  69         WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
  70
  71         list_for_each_entry(connector, &config->connector_list, head) {
  72                 if (connector->state->best_encoder != encoder)
  73                         continue;
  74
  75                 return connector->state->crtc;
  76         }
  77
  78         return NULL;
  79 }
  80
  81 static int
  82 steal_encoder(struct drm_atomic_state *state,
  83               struct drm_encoder *encoder,
  84               struct drm_crtc *encoder_crtc)
  85 {
  86         struct drm_mode_config *config = &state->dev->mode_config;
  87         struct drm_crtc_state *crtc_state;
  88         struct drm_connector *connector;
  89         struct drm_connector_state *connector_state;
  90         int ret;
  91
  92         /*
  93          * We can only steal an encoder coming from a connector, which means we
  94          * must already hold the connection_mutex.
  95          */
  96         WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
  97
  98         DRM_DEBUG_KMS("[ENCODER:%d:%s] in use on [CRTC:%d], stealing it\n",
  99                       encoder->base.id, encoder->name,
 100                       encoder_crtc->base.id);
 101
 102         crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
 103         if (IS_ERR(crtc_state))
 104                 return PTR_ERR(crtc_state);
 105
 106         crtc_state->mode_changed = true;
 107
 108         list_for_each_entry(connector, &config->connector_list, head) {
 109                 if (connector->state->best_encoder != encoder)
 110                         continue;
 111
 112                 DRM_DEBUG_KMS("Stealing encoder from [CONNECTOR:%d:%s]\n",
 113                               connector->base.id,
 114                               connector->name);
 115
 116                 connector_state = drm_atomic_get_connector_state(state,
 117                                                                  connector);
 118                 if (IS_ERR(connector_state))
 119                         return PTR_ERR(connector_state);
 120
 121                 ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
 122                 if (ret)
 123                         return ret;
 124                 connector_state->best_encoder = NULL;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int
 131 update_connector_routing(struct drm_atomic_state *state, int conn_idx)
 132 {
 133         struct drm_connector_helper_funcs *funcs;
 134         struct drm_encoder *new_encoder;
 135         struct drm_crtc *encoder_crtc;
 136         struct drm_connector *connector;
 137         struct drm_connector_state *connector_state;
 138         struct drm_crtc_state *crtc_state;
 139         int idx, ret;
 140
 141         connector = state->connectors[conn_idx];
 142         connector_state = state->connector_states[conn_idx];
 143
 144         if (!connector)
 145                 return 0;
 146
 147         DRM_DEBUG_KMS("Updating routing for [CONNECTOR:%d:%s]\n",
 148                         connector->base.id,
 149                         connector->name);
 150
 151         if (connector->state->crtc != connector_state->crtc) {
 152                 if (connector->state->crtc) {
 153                         idx = drm_crtc_index(connector->state->crtc);
 154
 155                         crtc_state = state->crtc_states[idx];
 156                         crtc_state->mode_changed = true;
 157                 }
 158
 159                 if (connector_state->crtc) {
 160                         idx = drm_crtc_index(connector_state->crtc);
 161
 162                         crtc_state = state->crtc_states[idx];
 163                         crtc_state->mode_changed = true;
 164                 }
 165         }
 166
 167         if (!connector_state->crtc) {
 168                 DRM_DEBUG_KMS("Disabling [CONNECTOR:%d:%s]\n",
 169                                 connector->base.id,
 170                                 connector->name);
 171
 172                 connector_state->best_encoder = NULL;
 173
 174                 return 0;
 175         }
 176
 177         funcs = connector->helper_private;
 178         new_encoder = funcs->best_encoder(connector);
 179
 180         if (!new_encoder) {
 181                 DRM_DEBUG_KMS("No suitable encoder found for [CONNECTOR:%d:%s]\n",
 182                               connector->base.id,
 183                               connector->name);
 184                 return -EINVAL;
 185         }
 186
 187         if (new_encoder == connector_state->best_encoder) {
 188                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
 189                               connector->base.id,
 190                               connector->name,
 191                               new_encoder->base.id,
 192                               new_encoder->name,
 193                               connector_state->crtc->base.id);
 194
 195                 return 0;
 196         }
 197
 198         encoder_crtc = get_current_crtc_for_encoder(state->dev,
 199                                                     new_encoder);
 200
 201         if (encoder_crtc) {
 202                 ret = steal_encoder(state, new_encoder, encoder_crtc);
 203                 if (ret) {
 204                         DRM_DEBUG_KMS("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
 205                                       connector->base.id,
 206                                       connector->name);
 207                         return ret;
 208                 }
 209         }
 210
 211         connector_state->best_encoder = new_encoder;
 212         idx = drm_crtc_index(connector_state->crtc);
 213
 214         crtc_state = state->crtc_states[idx];
 215         crtc_state->mode_changed = true;
 216
 217         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
 218                       connector->base.id,
 219                       connector->name,
 220                       new_encoder->base.id,
 221                       new_encoder->name,
 222                       connector_state->crtc->base.id);
 223
 224         return 0;
 225 }
 226
 227 static int
 228 mode_fixup(struct drm_atomic_state *state)
 229 {
 230         int ncrtcs = state->dev->mode_config.num_crtc;
 231         int nconnectors = state->dev->mode_config.num_connector;
 232         struct drm_crtc_state *crtc_state;
 233         struct drm_connector_state *conn_state;
 234         int i;
 235         bool ret;
 236
 237         for (i = 0; i < ncrtcs; i++) {
 238                 crtc_state = state->crtc_states[i];
 239
 240                 if (!crtc_state || !crtc_state->mode_changed)
 241                         continue;
 242
 243                 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
 244         }
 245
 246         for (i = 0; i < nconnectors; i++) {
 247                 struct drm_encoder_helper_funcs *funcs;
 248                 struct drm_encoder *encoder;
 249
 250                 conn_state = state->connector_states[i];
 251
 252                 if (!conn_state)
 253                         continue;
 254
 255                 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
 256
 257                 if (!conn_state->crtc || !conn_state->best_encoder)
 258                         continue;
 259
 260                 crtc_state =
 261                         state->crtc_states[drm_crtc_index(conn_state->crtc)];
 262
 263                 /*
 264                  * Each encoder has at most one connector (since we always steal
 265                  * it away), so we won't call ->mode_fixup twice.
 266                  */
 267                 encoder = conn_state->best_encoder;
 268                 funcs = encoder->helper_private;
 269
 270                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 271                         ret = encoder->bridge->funcs->mode_fixup(
 272                                         encoder->bridge, &crtc_state->mode,
 273                                         &crtc_state->adjusted_mode);
 274                         if (!ret) {
 275                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 276                                 return -EINVAL;
 277                         }
 278                 }
 279
 280
 281                 ret = funcs->mode_fixup(encoder, &crtc_state->mode,
 282                                         &crtc_state->adjusted_mode);
 283                 if (!ret) {
 284                         DRM_DEBUG_KMS("[ENCODER:%d:%s] fixup failed\n",
 285                                       encoder->base.id, encoder->name);
 286                         return -EINVAL;
 287                 }
 288         }
 289
 290         for (i = 0; i < ncrtcs; i++) {
 291                 struct drm_crtc_helper_funcs *funcs;
 292                 struct drm_crtc *crtc;
 293
 294                 crtc_state = state->crtc_states[i];
 295                 crtc = state->crtcs[i];
 296
 297                 if (!crtc_state || !crtc_state->mode_changed)
 298                         continue;
 299
 300                 funcs = crtc->helper_private;
 301                 ret = funcs->mode_fixup(crtc, &crtc_state->mode,
 302                                         &crtc_state->adjusted_mode);
 303                 if (!ret) {
 304                         DRM_DEBUG_KMS("[CRTC:%d] fixup failed\n",
 305                                       crtc->base.id);
 306                         return -EINVAL;
 307                 }
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int
 314 drm_atomic_helper_check_prepare(struct drm_device *dev,
 315                                 struct drm_atomic_state *state)
 316 {
 317         int ncrtcs = dev->mode_config.num_crtc;
 318         int nconnectors = dev->mode_config.num_connector;
 319         struct drm_crtc *crtc;
 320         struct drm_crtc_state *crtc_state;
 321         int i, ret;
 322
 323         for (i = 0; i < ncrtcs; i++) {
 324                 crtc = state->crtcs[i];
 325                 crtc_state = state->crtc_states[i];
 326
 327                 if (!crtc)
 328                         continue;
 329
 330                 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
 331                         DRM_DEBUG_KMS("[CRTC:%d] mode changed\n",
 332                                       crtc->base.id);
 333                         crtc_state->mode_changed = true;
 334                 }
 335
 336                 if (crtc->state->enable != crtc_state->enable) {
 337                         DRM_DEBUG_KMS("[CRTC:%d] enable changed\n",
 338                                       crtc->base.id);
 339                         crtc_state->mode_changed = true;
 340                 }
 341         }
 342
 343         for (i = 0; i < nconnectors; i++) {
 344                 /*
 345                  * This only sets crtc->mode_changed for routing changes,
 346                  * drivers must set crtc->mode_changed themselves when connector
 347                  * properties need to be updated.
 348                  */
 349                 ret = update_connector_routing(state, i);
 350                 if (ret)
 351                         return ret;
 352         }
 353
 354         /*
 355          * After all the routing has been prepared we need to add in any
 356          * connector which is itself unchanged, but who's crtc changes it's
 357          * configuration. This must be done before calling mode_fixup in case a
 358          * crtc only changed its mode but has the same set of connectors.
 359          */
 360         for (i = 0; i < ncrtcs; i++) {
 361                 int num_connectors;
 362
 363                 crtc = state->crtcs[i];
 364                 crtc_state = state->crtc_states[i];
 365
 366                 if (!crtc || !crtc_state->mode_changed)
 367                         continue;
 368
 369                 DRM_DEBUG_KMS("[CRTC:%d] needs full modeset, enable: %c\n",
 370                               crtc->base.id,
 371                               crtc_state->enable ? 'y' : 'n');
 372
 373                 ret = drm_atomic_add_affected_connectors(state, crtc);
 374                 if (ret != 0)
 375                         return ret;
 376
 377                 num_connectors = drm_atomic_connectors_for_crtc(state,
 378                                                                 crtc);
 379
 380                 if (crtc_state->enable != !!num_connectors) {
 381                         DRM_DEBUG_KMS("[CRTC:%d] enabled/connectors mismatch\n",
 382                                       crtc->base.id);
 383
 384                         return -EINVAL;
 385                 }
 386         }
 387
 388         return mode_fixup(state);
 389 }
 390
 391 /**
 392  * drm_atomic_helper_check - validate state object
 393  * @dev: DRM device
 394  * @state: the driver state object
 395  *
 396  * Check the state object to see if the requested state is physically possible.
 397  * Only crtcs and planes have check callbacks, so for any additional (global)
 398  * checking that a driver needs it can simply wrap that around this function.
 399  * Drivers without such needs can directly use this as their ->atomic_check()
 400  * callback.
 401  *
 402  * RETURNS
 403  * Zero for success or -errno
 404  */
 405 int drm_atomic_helper_check(struct drm_device *dev,
 406                             struct drm_atomic_state *state)
 407 {
 408         int nplanes = dev->mode_config.num_total_plane;
 409         int ncrtcs = dev->mode_config.num_crtc;
 410         int i, ret = 0;
 411
 412         ret = drm_atomic_helper_check_prepare(dev, state);
 413         if (ret)
 414                 return ret;
 415
 416         for (i = 0; i < nplanes; i++) {
 417                 struct drm_plane_helper_funcs *funcs;
 418                 struct drm_plane *plane = state->planes[i];
 419                 struct drm_plane_state *plane_state = state->plane_states[i];
 420
 421                 if (!plane)
 422                         continue;
 423
 424                 funcs = plane->helper_private;
 425
 426                 drm_atomic_helper_plane_changed(state, plane_state, plane);
 427
 428                 if (!funcs || !funcs->atomic_check)
 429                         continue;
 430
 431                 ret = funcs->atomic_check(plane, plane_state);
 432                 if (ret) {
 433                         DRM_DEBUG_KMS("[PLANE:%d] atomic check failed\n",
 434                                       plane->base.id);
 435                         return ret;
 436                 }
 437         }
 438
 439         for (i = 0; i < ncrtcs; i++) {
 440                 struct drm_crtc_helper_funcs *funcs;
 441                 struct drm_crtc *crtc = state->crtcs[i];
 442
 443                 if (!crtc)
 444                         continue;
 445
 446                 funcs = crtc->helper_private;
 447
 448                 if (!funcs || !funcs->atomic_check)
 449                         continue;
 450
 451                 ret = funcs->atomic_check(crtc, state->crtc_states[i]);
 452                 if (ret) {
 453                         DRM_DEBUG_KMS("[CRTC:%d] atomic check failed\n",
 454                                       crtc->base.id);
 455                         return ret;
 456                 }
 457         }
 458
 459         return ret;
 460 }
 461 EXPORT_SYMBOL(drm_atomic_helper_check);
 462
 463 static void
 464 disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 465 {
 466         int ncrtcs = old_state->dev->mode_config.num_crtc;
 467         int nconnectors = old_state->dev->mode_config.num_connector;
 468         int i;
 469
 470         for (i = 0; i < nconnectors; i++) {
 471                 struct drm_connector_state *old_conn_state;
 472                 struct drm_connector *connector;
 473                 struct drm_encoder_helper_funcs *funcs;
 474                 struct drm_encoder *encoder;
 475
 476                 old_conn_state = old_state->connector_states[i];
 477                 connector = old_state->connectors[i];
 478
 479                 /* Shut down everything that's in the changeset and currently
 480                  * still on. So need to check the old, saved state. */
 481                 if (!old_conn_state || !old_conn_state->crtc)
 482                         continue;
 483
 484                 encoder = connector->state->best_encoder;
 485
 486                 if (!encoder)
 487                         continue;
 488
 489                 funcs = encoder->helper_private;
 490
 491                 /*
 492                  * Each encoder has at most one connector (since we always steal
 493                  * it away), so we won't call call disable hooks twice.
 494                  */
 495                 if (encoder->bridge)
 496                         encoder->bridge->funcs->disable(encoder->bridge);
 497
 498                 /* Right function depends upon target state. */
 499                 if (connector->state->crtc)
 500                         funcs->prepare(encoder);
 501                 else if (funcs->disable)
 502                         funcs->disable(encoder);
 503                 else
 504                         funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
 505
 506                 if (encoder->bridge)
 507                         encoder->bridge->funcs->post_disable(encoder->bridge);
 508         }
 509
 510         for (i = 0; i < ncrtcs; i++) {
 511                 struct drm_crtc_helper_funcs *funcs;
 512                 struct drm_crtc *crtc;
 513
 514                 crtc = old_state->crtcs[i];
 515
 516                 /* Shut down everything that needs a full modeset. */
 517                 if (!crtc || !crtc->state->mode_changed)
 518                         continue;
 519
 520                 funcs = crtc->helper_private;
 521
 522                 /* Right function depends upon target state. */
 523                 if (crtc->state->enable)
 524                         funcs->prepare(crtc);
 525                 else if (funcs->disable)
 526                         funcs->disable(crtc);
 527                 else
 528                         funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 529         }
 530 }
 531
 532 static void
 533 set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
 534 {
 535         int nconnectors = dev->mode_config.num_connector;
 536         int ncrtcs = old_state->dev->mode_config.num_crtc;
 537         int i;
 538
 539         /* clear out existing links */
 540         for (i = 0; i < nconnectors; i++) {
 541                 struct drm_connector *connector;
 542
 543                 connector = old_state->connectors[i];
 544
 545                 if (!connector || !connector->encoder)
 546                         continue;
 547
 548                 WARN_ON(!connector->encoder->crtc);
 549
 550                 connector->encoder->crtc = NULL;
 551                 connector->encoder = NULL;
 552         }
 553
 554         /* set new links */
 555         for (i = 0; i < nconnectors; i++) {
 556                 struct drm_connector *connector;
 557
 558                 connector = old_state->connectors[i];
 559
 560                 if (!connector || !connector->state->crtc)
 561                         continue;
 562
 563                 if (WARN_ON(!connector->state->best_encoder))
 564                         continue;
 565
 566                 connector->encoder = connector->state->best_encoder;
 567                 connector->encoder->crtc = connector->state->crtc;
 568         }
 569
 570         /* set legacy state in the crtc structure */
 571         for (i = 0; i < ncrtcs; i++) {
 572                 struct drm_crtc *crtc;
 573
 574                 crtc = old_state->crtcs[i];
 575
 576                 if (!crtc)
 577                         continue;
 578
 579                 crtc->mode = crtc->state->mode;
 580                 crtc->enabled = crtc->state->enable;
 581                 crtc->x = crtc->primary->state->src_x >> 16;
 582                 crtc->y = crtc->primary->state->src_y >> 16;
 583         }
 584 }
 585
 586 static void
 587 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
 588 {
 589         int ncrtcs = old_state->dev->mode_config.num_crtc;
 590         int nconnectors = old_state->dev->mode_config.num_connector;
 591         int i;
 592
 593         for (i = 0; i < ncrtcs; i++) {
 594                 struct drm_crtc_helper_funcs *funcs;
 595                 struct drm_crtc *crtc;
 596
 597                 crtc = old_state->crtcs[i];
 598
 599                 if (!crtc || !crtc->state->mode_changed)
 600                         continue;
 601
 602                 funcs = crtc->helper_private;
 603
 604                 if (crtc->state->enable)
 605                         funcs->mode_set_nofb(crtc);
 606         }
 607
 608         for (i = 0; i < nconnectors; i++) {
 609                 struct drm_connector *connector;
 610                 struct drm_crtc_state *new_crtc_state;
 611                 struct drm_encoder_helper_funcs *funcs;
 612                 struct drm_encoder *encoder;
 613                 struct drm_display_mode *mode, *adjusted_mode;
 614
 615                 connector = old_state->connectors[i];
 616
 617                 if (!connector || !connector->state->best_encoder)
 618                         continue;
 619
 620                 encoder = connector->state->best_encoder;
 621                 funcs = encoder->helper_private;
 622                 new_crtc_state = connector->state->crtc->state;
 623                 mode = &new_crtc_state->mode;
 624                 adjusted_mode = &new_crtc_state->adjusted_mode;
 625
 626                 /*
 627                  * Each encoder has at most one connector (since we always steal
 628                  * it away), so we won't call call mode_set hooks twice.
 629                  */
 630                 funcs->mode_set(encoder, mode, adjusted_mode);
 631
 632                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 633                         encoder->bridge->funcs->mode_set(encoder->bridge,
 634                                                          mode, adjusted_mode);
 635         }
 636 }
 637
 638 /**
 639  * drm_atomic_helper_commit_pre_planes - modeset commit before plane updates
 640  * @dev: DRM device
 641  * @state: atomic state
 642  *
 643  * This function commits the modeset changes that need to be committed before
 644  * updating planes. It shuts down all the outputs that need to be shut down and
 645  * prepares them (if required) with the new mode.
 646  */
 647 void drm_atomic_helper_commit_pre_planes(struct drm_device *dev,
 648                                          struct drm_atomic_state *state)
 649 {
 650         disable_outputs(dev, state);
 651         set_routing_links(dev, state);
 652         crtc_set_mode(dev, state);
 653 }
 654 EXPORT_SYMBOL(drm_atomic_helper_commit_pre_planes);
 655
 656 /**
 657  * drm_atomic_helper_commit_post_planes - modeset commit after plane updates
 658  * @dev: DRM device
 659  * @old_state: atomic state object with old state structures
 660  *
 661  * This function commits the modeset changes that need to be committed after
 662  * updating planes: It enables all the outputs with the new configuration which
 663  * had to be turned off for the update.
 664  */
 665 void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
 666                                           struct drm_atomic_state *old_state)
 667 {
 668         int ncrtcs = old_state->dev->mode_config.num_crtc;
 669         int nconnectors = old_state->dev->mode_config.num_connector;
 670         int i;
 671
 672         for (i = 0; i < ncrtcs; i++) {
 673                 struct drm_crtc_helper_funcs *funcs;
 674                 struct drm_crtc *crtc;
 675
 676                 crtc = old_state->crtcs[i];
 677
 678                 /* Need to filter out CRTCs where only planes change. */
 679                 if (!crtc || !crtc->state->mode_changed)
 680                         continue;
 681
 682                 funcs = crtc->helper_private;
 683
 684                 if (crtc->state->enable)
 685                         funcs->commit(crtc);
 686         }
 687
 688         for (i = 0; i < nconnectors; i++) {
 689                 struct drm_connector *connector;
 690                 struct drm_encoder_helper_funcs *funcs;
 691                 struct drm_encoder *encoder;
 692
 693                 connector = old_state->connectors[i];
 694
 695                 if (!connector || !connector->state->best_encoder)
 696                         continue;
 697
 698                 encoder = connector->state->best_encoder;
 699                 funcs = encoder->helper_private;
 700
 701                 /*
 702                  * Each encoder has at most one connector (since we always steal
 703                  * it away), so we won't call call enable hooks twice.
 704                  */
 705                 if (encoder->bridge)
 706                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 707
 708                 funcs->commit(encoder);
 709
 710                 if (encoder->bridge)
 711                         encoder->bridge->funcs->enable(encoder->bridge);
 712         }
 713 }
 714 EXPORT_SYMBOL(drm_atomic_helper_commit_post_planes);
 715
 716 static void wait_for_fences(struct drm_device *dev,
 717                             struct drm_atomic_state *state)
 718 {
 719         int nplanes = dev->mode_config.num_total_plane;
 720         int i;
 721
 722         for (i = 0; i < nplanes; i++) {
 723                 struct drm_plane *plane = state->planes[i];
 724
 725                 if (!plane || !plane->state->fence)
 726                         continue;
 727
 728                 WARN_ON(!plane->state->fb);
 729
 730                 fence_wait(plane->state->fence, false);
 731                 fence_put(plane->state->fence);
 732                 plane->state->fence = NULL;
 733         }
 734 }
 735
 736 static void
 737 wait_for_vblanks(struct drm_device *dev, struct drm_atomic_state *old_state)
 738 {
 739         struct drm_crtc *crtc;
 740         struct drm_crtc_state *old_crtc_state;
 741         int ncrtcs = old_state->dev->mode_config.num_crtc;
 742         int i, ret;
 743
 744         for (i = 0; i < ncrtcs; i++) {
 745                 crtc = old_state->crtcs[i];
 746                 old_crtc_state = old_state->crtc_states[i];
 747
 748                 if (!crtc)
 749                         continue;
 750
 751                 /* No one cares about the old state, so abuse it for tracking
 752                  * and store whether we hold a vblank reference (and should do a
 753                  * vblank wait) in the ->enable boolean. */
 754                 old_crtc_state->enable = false;
 755
 756                 if (!crtc->state->enable)
 757                         continue;
 758
 759                 ret = drm_crtc_vblank_get(crtc);
 760                 if (ret != 0)
 761                         continue;
 762
 763                 old_crtc_state->enable = true;
 764                 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
 765         }
 766
 767         for (i = 0; i < ncrtcs; i++) {
 768                 crtc = old_state->crtcs[i];
 769                 old_crtc_state = old_state->crtc_states[i];
 770
 771                 if (!crtc || !old_crtc_state->enable)
 772                         continue;
 773
 774                 ret = wait_event_timeout(dev->vblank[i].queue,
 775                                 old_crtc_state->last_vblank_count !=
 776                                         drm_vblank_count(dev, i),
 777                                 msecs_to_jiffies(50));
 778
 779                 drm_crtc_vblank_put(crtc);
 780         }
 781 }
 782
 783 /**
 784  * drm_atomic_helper_commit - commit validated state object
 785  * @dev: DRM device
 786  * @state: the driver state object
 787  * @async: asynchronous commit
 788  *
 789  * This function commits a with drm_atomic_helper_check() pre-validated state
 790  * object. This can still fail when e.g. the framebuffer reservation fails. For
 791  * now this doesn't implement asynchronous commits.
 792  *
 793  * RETURNS
 794  * Zero for success or -errno.
 795  */
 796 int drm_atomic_helper_commit(struct drm_device *dev,
 797                              struct drm_atomic_state *state,
 798                              bool async)
 799 {
 800         int ret;
 801
 802         if (async)
 803                 return -EBUSY;
 804
 805         ret = drm_atomic_helper_prepare_planes(dev, state);
 806         if (ret)
 807                 return ret;
 808
 809         /*
 810          * This is the point of no return - everything below never fails except
 811          * when the hw goes bonghits. Which means we can commit the new state on
 812          * the software side now.
 813          */
 814
 815         drm_atomic_helper_swap_state(dev, state);
 816
 817         /*
 818          * Everything below can be run asynchronously without the need to grab
 819          * any modeset locks at all under one conditions: It must be guaranteed
 820          * that the asynchronous work has either been cancelled (if the driver
 821          * supports it, which at least requires that the framebuffers get
 822          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
 823          * before the new state gets committed on the software side with
 824          * drm_atomic_helper_swap_state().
 825          *
 826          * This scheme allows new atomic state updates to be prepared and
 827          * checked in parallel to the asynchronous completion of the previous
 828          * update. Which is important since compositors need to figure out the
 829          * composition of the next frame right after having submitted the
 830          * current layout.
 831          */
 832
 833         wait_for_fences(dev, state);
 834
 835         drm_atomic_helper_commit_pre_planes(dev, state);
 836
 837         drm_atomic_helper_commit_planes(dev, state);
 838
 839         drm_atomic_helper_commit_post_planes(dev, state);
 840
 841         wait_for_vblanks(dev, state);
 842
 843         drm_atomic_helper_cleanup_planes(dev, state);
 844
 845         drm_atomic_state_free(state);
 846
 847         return 0;
 848 }
 849 EXPORT_SYMBOL(drm_atomic_helper_commit);
 850
 851 /**
 852  * drm_atomic_helper_prepare_planes - prepare plane resources after commit
 853  * @dev: DRM device
 854  * @state: atomic state object with old state structures
 855  *
 856  * This function prepares plane state, specifically framebuffers, for the new
 857  * configuration. If any failure is encountered this function will call
 858  * ->cleanup_fb on any already successfully prepared framebuffer.
 859  *
 860  * Returns:
 861  * 0 on success, negative error code on failure.
 862  */
 863 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
 864                                      struct drm_atomic_state *state)
 865 {
 866         int nplanes = dev->mode_config.num_total_plane;
 867         int ret, i;
 868
 869         for (i = 0; i < nplanes; i++) {
 870                 struct drm_plane_helper_funcs *funcs;
 871                 struct drm_plane *plane = state->planes[i];
 872                 struct drm_framebuffer *fb;
 873
 874                 if (!plane)
 875                         continue;
 876
 877                 funcs = plane->helper_private;
 878
 879                 fb = state->plane_states[i]->fb;
 880
 881                 if (fb && funcs->prepare_fb) {
 882                         ret = funcs->prepare_fb(plane, fb);
 883                         if (ret)
 884                                 goto fail;
 885                 }
 886         }
 887
 888         return 0;
 889
 890 fail:
 891         for (i--; i >= 0; i--) {
 892                 struct drm_plane_helper_funcs *funcs;
 893                 struct drm_plane *plane = state->planes[i];
 894                 struct drm_framebuffer *fb;
 895
 896                 if (!plane)
 897                         continue;
 898
 899                 funcs = plane->helper_private;
 900
 901                 fb = state->plane_states[i]->fb;
 902
 903                 if (fb && funcs->cleanup_fb)
 904                         funcs->cleanup_fb(plane, fb);
 905
 906         }
 907
 908         return ret;
 909 }
 910 EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
 911
 912 /**
 913  * drm_atomic_helper_commit_planes - commit plane state
 914  * @dev: DRM device
 915  * @state: atomic state
 916  *
 917  * This function commits the new plane state using the plane and atomic helper
 918  * functions for planes and crtcs. It assumes that the atomic state has already
 919  * been pushed into the relevant object state pointers, since this step can no
 920  * longer fail.
 921  *
 922  * It still requires the global state object @state to know which planes and
 923  * crtcs need to be updated though.
 924  */
 925 void drm_atomic_helper_commit_planes(struct drm_device *dev,
 926                                      struct drm_atomic_state *state)
 927 {
 928         int nplanes = dev->mode_config.num_total_plane;
 929         int ncrtcs = dev->mode_config.num_crtc;
 930         int i;
 931
 932         for (i = 0; i < ncrtcs; i++) {
 933                 struct drm_crtc_helper_funcs *funcs;
 934                 struct drm_crtc *crtc = state->crtcs[i];
 935
 936                 if (!crtc)
 937                         continue;
 938
 939                 funcs = crtc->helper_private;
 940
 941                 if (!funcs || !funcs->atomic_begin)
 942                         continue;
 943
 944                 funcs->atomic_begin(crtc);
 945         }
 946
 947         for (i = 0; i < nplanes; i++) {
 948                 struct drm_plane_helper_funcs *funcs;
 949                 struct drm_plane *plane = state->planes[i];
 950
 951                 if (!plane)
 952                         continue;
 953
 954                 funcs = plane->helper_private;
 955
 956                 if (!funcs || !funcs->atomic_update)
 957                         continue;
 958
 959                 funcs->atomic_update(plane);
 960         }
 961
 962         for (i = 0; i < ncrtcs; i++) {
 963                 struct drm_crtc_helper_funcs *funcs;
 964                 struct drm_crtc *crtc = state->crtcs[i];
 965
 966                 if (!crtc)
 967                         continue;
 968
 969                 funcs = crtc->helper_private;
 970
 971                 if (!funcs || !funcs->atomic_flush)
 972                         continue;
 973
 974                 funcs->atomic_flush(crtc);
 975         }
 976 }
 977 EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
 978
 979 /**
 980  * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
 981  * @dev: DRM device
 982  * @old_state: atomic state object with old state structures
 983  *
 984  * This function cleans up plane state, specifically framebuffers, from the old
 985  * configuration. Hence the old configuration must be perserved in @old_state to
 986  * be able to call this function.
 987  *
 988  * This function must also be called on the new state when the atomic update
 989  * fails at any point after calling drm_atomic_helper_prepare_planes().
 990  */
 991 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
 992                                       struct drm_atomic_state *old_state)
 993 {
 994         int nplanes = dev->mode_config.num_total_plane;
 995         int i;
 996
 997         for (i = 0; i < nplanes; i++) {
 998                 struct drm_plane_helper_funcs *funcs;
 999                 struct drm_plane *plane = old_state->planes[i];
1000                 struct drm_framebuffer *old_fb;
1001
1002                 if (!plane)
1003                         continue;
1004
1005                 funcs = plane->helper_private;
1006
1007                 old_fb = old_state->plane_states[i]->fb;
1008
1009                 if (old_fb && funcs->cleanup_fb)
1010                         funcs->cleanup_fb(plane, old_fb);
1011         }
1012 }
1013 EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1014
1015 /**
1016  * drm_atomic_helper_swap_state - store atomic state into current sw state
1017  * @dev: DRM device
1018  * @state: atomic state
1019  *
1020  * This function stores the atomic state into the current state pointers in all
1021  * driver objects. It should be called after all failing steps have been done
1022  * and succeeded, but before the actual hardware state is committed.
1023  *
1024  * For cleanup and error recovery the current state for all changed objects will
1025  * be swaped into @state.
1026  *
1027  * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1028  *
1029  * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1030  *
1031  * 2. Do any other steps that might fail.
1032  *
1033  * 3. Put the staged state into the current state pointers with this function.
1034  *
1035  * 4. Actually commit the hardware state.
1036  *
1037  * 5. Call drm_atomic_helper_cleanup_planes with @state, which since step 3
1038  * contains the old state. Also do any other cleanup required with that state.
1039  */
1040 void drm_atomic_helper_swap_state(struct drm_device *dev,
1041                                   struct drm_atomic_state *state)
1042 {
1043         int i;
1044
1045         for (i = 0; i < dev->mode_config.num_connector; i++) {
1046                 struct drm_connector *connector = state->connectors[i];
1047
1048                 if (!connector)
1049                         continue;
1050
1051                 connector->state->state = state;
1052                 swap(state->connector_states[i], connector->state);
1053                 connector->state->state = NULL;
1054         }
1055
1056         for (i = 0; i < dev->mode_config.num_crtc; i++) {
1057                 struct drm_crtc *crtc = state->crtcs[i];
1058
1059                 if (!crtc)
1060                         continue;
1061
1062                 crtc->state->state = state;
1063                 swap(state->crtc_states[i], crtc->state);
1064                 crtc->state->state = NULL;
1065         }
1066
1067         for (i = 0; i < dev->mode_config.num_total_plane; i++) {
1068                 struct drm_plane *plane = state->planes[i];
1069
1070                 if (!plane)
1071                         continue;
1072
1073                 plane->state->state = state;
1074                 swap(state->plane_states[i], plane->state);
1075                 plane->state->state = NULL;
1076         }
1077 }
1078 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
1079
1080 /**
1081  * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
1082  * @plane: plane object to update
1083  * @crtc: owning CRTC of owning plane
1084  * @fb: framebuffer to flip onto plane
1085  * @crtc_x: x offset of primary plane on crtc
1086  * @crtc_y: y offset of primary plane on crtc
1087  * @crtc_w: width of primary plane rectangle on crtc
1088  * @crtc_h: height of primary plane rectangle on crtc
1089  * @src_x: x offset of @fb for panning
1090  * @src_y: y offset of @fb for panning
1091  * @src_w: width of source rectangle in @fb
1092  * @src_h: height of source rectangle in @fb
1093  *
1094  * Provides a default plane update handler using the atomic driver interface.
1095  *
1096  * RETURNS:
1097  * Zero on success, error code on failure
1098  */
1099 int drm_atomic_helper_update_plane(struct drm_plane *plane,
1100                                    struct drm_crtc *crtc,
1101                                    struct drm_framebuffer *fb,
1102                                    int crtc_x, int crtc_y,
1103                                    unsigned int crtc_w, unsigned int crtc_h,
1104                                    uint32_t src_x, uint32_t src_y,
1105                                    uint32_t src_w, uint32_t src_h)
1106 {
1107         struct drm_atomic_state *state;
1108         struct drm_plane_state *plane_state;
1109         int ret = 0;
1110
1111         state = drm_atomic_state_alloc(plane->dev);
1112         if (!state)
1113                 return -ENOMEM;
1114
1115         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1116 retry:
1117         plane_state = drm_atomic_get_plane_state(state, plane);
1118         if (IS_ERR(plane_state)) {
1119                 ret = PTR_ERR(plane_state);
1120                 goto fail;
1121         }
1122
1123         ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1124         if (ret != 0)
1125                 goto fail;
1126         plane_state->fb = fb;
1127         plane_state->crtc_x = crtc_x;
1128         plane_state->crtc_y = crtc_y;
1129         plane_state->crtc_h = crtc_h;
1130         plane_state->crtc_w = crtc_w;
1131         plane_state->src_x = src_x;
1132         plane_state->src_y = src_y;
1133         plane_state->src_h = src_h;
1134         plane_state->src_w = src_w;
1135
1136         ret = drm_atomic_commit(state);
1137         if (ret != 0)
1138                 goto fail;
1139
1140         /* Driver takes ownership of state on successful commit. */
1141         return 0;
1142 fail:
1143         if (ret == -EDEADLK)
1144                 goto backoff;
1145
1146         drm_atomic_state_free(state);
1147
1148         return ret;
1149 backoff:
1150         drm_atomic_legacy_backoff(state);
1151         drm_atomic_state_clear(state);
1152
1153         /*
1154          * Someone might have exchanged the framebuffer while we dropped locks
1155          * in the backoff code. We need to fix up the fb refcount tracking the
1156          * core does for us.
1157          */
1158         plane->old_fb = plane->fb;
1159
1160         goto retry;
1161 }
1162 EXPORT_SYMBOL(drm_atomic_helper_update_plane);
1163
1164 /**
1165  * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
1166  * @plane: plane to disable
1167  *
1168  * Provides a default plane disable handler using the atomic driver interface.
1169  *
1170  * RETURNS:
1171  * Zero on success, error code on failure
1172  */
1173 int drm_atomic_helper_disable_plane(struct drm_plane *plane)
1174 {
1175         struct drm_atomic_state *state;
1176         struct drm_plane_state *plane_state;
1177         int ret = 0;
1178
1179         state = drm_atomic_state_alloc(plane->dev);
1180         if (!state)
1181                 return -ENOMEM;
1182
1183         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
1184 retry:
1185         plane_state = drm_atomic_get_plane_state(state, plane);
1186         if (IS_ERR(plane_state)) {
1187                 ret = PTR_ERR(plane_state);
1188                 goto fail;
1189         }
1190
1191         ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1192         if (ret != 0)
1193                 goto fail;
1194         plane_state->fb = NULL;
1195         plane_state->crtc_x = 0;
1196         plane_state->crtc_y = 0;
1197         plane_state->crtc_h = 0;
1198         plane_state->crtc_w = 0;
1199         plane_state->src_x = 0;
1200         plane_state->src_y = 0;
1201         plane_state->src_h = 0;
1202         plane_state->src_w = 0;
1203
1204         ret = drm_atomic_commit(state);
1205         if (ret != 0)
1206                 goto fail;
1207
1208         /* Driver takes ownership of state on successful commit. */
1209         return 0;
1210 fail:
1211         if (ret == -EDEADLK)
1212                 goto backoff;
1213
1214         drm_atomic_state_free(state);
1215
1216         return ret;
1217 backoff:
1218         drm_atomic_legacy_backoff(state);
1219         drm_atomic_state_clear(state);
1220
1221         /*
1222          * Someone might have exchanged the framebuffer while we dropped locks
1223          * in the backoff code. We need to fix up the fb refcount tracking the
1224          * core does for us.
1225          */
1226         plane->old_fb = plane->fb;
1227
1228         goto retry;
1229 }
1230 EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
1231
1232 static int update_output_state(struct drm_atomic_state *state,
1233                                struct drm_mode_set *set)
1234 {
1235         struct drm_device *dev = set->crtc->dev;
1236         struct drm_connector_state *conn_state;
1237         int nconnectors = state->dev->mode_config.num_connector;
1238         int ncrtcs = state->dev->mode_config.num_crtc;
1239         int ret, i, j;
1240
1241         ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1242                                state->acquire_ctx);
1243         if (ret)
1244                 return ret;
1245
1246         /* First grab all affected connector/crtc states. */
1247         for (i = 0; i < set->num_connectors; i++) {
1248                 conn_state = drm_atomic_get_connector_state(state,
1249                                                             set->connectors[i]);
1250                 if (IS_ERR(conn_state))
1251                         return PTR_ERR(conn_state);
1252         }
1253
1254         for (i = 0; i < ncrtcs; i++) {
1255                 struct drm_crtc *crtc = state->crtcs[i];
1256
1257                 if (!crtc)
1258                         continue;
1259
1260                 ret = drm_atomic_add_affected_connectors(state, crtc);
1261                 if (ret)
1262                         return ret;
1263         }
1264
1265         /* Then recompute connector->crtc links and crtc enabling state. */
1266         for (i = 0; i < nconnectors; i++) {
1267                 struct drm_connector *connector;
1268
1269                 connector = state->connectors[i];
1270                 conn_state = state->connector_states[i];
1271
1272                 if (!connector)
1273                         continue;
1274
1275                 if (conn_state->crtc == set->crtc) {
1276                         ret = drm_atomic_set_crtc_for_connector(conn_state,
1277                                                                 NULL);
1278                         if (ret)
1279                                 return ret;
1280                 }
1281
1282                 for (j = 0; j < set->num_connectors; j++) {
1283                         if (set->connectors[j] == connector) {
1284                                 ret = drm_atomic_set_crtc_for_connector(conn_state,
1285                                                                         set->crtc);
1286                                 if (ret)
1287                                         return ret;
1288                                 break;
1289                         }
1290                 }
1291         }
1292
1293         for (i = 0; i < ncrtcs; i++) {
1294                 struct drm_crtc *crtc = state->crtcs[i];
1295                 struct drm_crtc_state *crtc_state = state->crtc_states[i];
1296
1297                 if (!crtc)
1298                         continue;
1299
1300                 /* Don't update ->enable for the CRTC in the set_config request,
1301                  * since a mismatch would indicate a bug in the upper layers.
1302                  * The actual modeset code later on will catch any
1303                  * inconsistencies here. */
1304                 if (crtc == set->crtc)
1305                         continue;
1306
1307                 crtc_state->enable =
1308                         drm_atomic_connectors_for_crtc(state, crtc);
1309         }
1310
1311         return 0;
1312 }
1313
1314 /**
1315  * drm_atomic_helper_set_config - set a new config from userspace
1316  * @set: mode set configuration
1317  *
1318  * Provides a default crtc set_config handler using the atomic driver interface.
1319  *
1320  * Returns:
1321  * Returns 0 on success, negative errno numbers on failure.
1322  */
1323 int drm_atomic_helper_set_config(struct drm_mode_set *set)
1324 {
1325         struct drm_atomic_state *state;
1326         struct drm_crtc *crtc = set->crtc;
1327         struct drm_crtc_state *crtc_state;
1328         struct drm_plane_state *primary_state;
1329         int ret = 0;
1330
1331         state = drm_atomic_state_alloc(crtc->dev);
1332         if (!state)
1333                 return -ENOMEM;
1334
1335         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1336 retry:
1337         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1338         if (IS_ERR(crtc_state)) {
1339                 ret = PTR_ERR(crtc_state);
1340                 goto fail;
1341         }
1342
1343         if (!set->mode) {
1344                 WARN_ON(set->fb);
1345                 WARN_ON(set->num_connectors);
1346
1347                 crtc_state->enable = false;
1348                 goto commit;
1349         }
1350
1351         WARN_ON(!set->fb);
1352         WARN_ON(!set->num_connectors);
1353
1354         crtc_state->enable = true;
1355         drm_mode_copy(&crtc_state->mode, set->mode);
1356
1357         primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1358         if (IS_ERR(primary_state)) {
1359                 ret = PTR_ERR(primary_state);
1360                 goto fail;
1361         }
1362
1363         ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1364         if (ret != 0)
1365                 goto fail;
1366         primary_state->fb = set->fb;
1367         primary_state->crtc_x = 0;
1368         primary_state->crtc_y = 0;
1369         primary_state->crtc_h = set->mode->vdisplay;
1370         primary_state->crtc_w = set->mode->hdisplay;
1371         primary_state->src_x = set->x << 16;
1372         primary_state->src_y = set->y << 16;
1373         primary_state->src_h = set->mode->vdisplay << 16;
1374         primary_state->src_w = set->mode->hdisplay << 16;
1375
1376 commit:
1377         ret = update_output_state(state, set);
1378         if (ret)
1379                 goto fail;
1380
1381         ret = drm_atomic_commit(state);
1382         if (ret != 0)
1383                 goto fail;
1384
1385         /* Driver takes ownership of state on successful commit. */
1386         return 0;
1387 fail:
1388         if (ret == -EDEADLK)
1389                 goto backoff;
1390
1391         drm_atomic_state_free(state);
1392
1393         return ret;
1394 backoff:
1395         drm_atomic_legacy_backoff(state);
1396         drm_atomic_state_clear(state);
1397
1398         /*
1399          * Someone might have exchanged the framebuffer while we dropped locks
1400          * in the backoff code. We need to fix up the fb refcount tracking the
1401          * core does for us.
1402          */
1403         crtc->primary->old_fb = crtc->primary->fb;
1404
1405         goto retry;
1406 }
1407 EXPORT_SYMBOL(drm_atomic_helper_set_config);
1408
1409 /**
1410  * drm_atomic_helper_crtc_set_property - helper for crtc prorties
1411  * @crtc: DRM crtc
1412  * @property: DRM property
1413  * @val: value of property
1414  *
1415  * Provides a default plane disablle handler using the atomic driver interface.
1416  *
1417  * RETURNS:
1418  * Zero on success, error code on failure
1419  */
1420 int
1421 drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
1422                                     struct drm_property *property,
1423                                     uint64_t val)
1424 {
1425         struct drm_atomic_state *state;
1426         struct drm_crtc_state *crtc_state;
1427         int ret = 0;
1428
1429         state = drm_atomic_state_alloc(crtc->dev);
1430         if (!state)
1431                 return -ENOMEM;
1432
1433         /* ->set_property is always called with all locks held. */
1434         state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
1435 retry:
1436         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1437         if (IS_ERR(crtc_state)) {
1438                 ret = PTR_ERR(crtc_state);
1439                 goto fail;
1440         }
1441
1442         ret = crtc->funcs->atomic_set_property(crtc, crtc_state,
1443                                                property, val);
1444         if (ret)
1445                 goto fail;
1446
1447         ret = drm_atomic_commit(state);
1448         if (ret != 0)
1449                 goto fail;
1450
1451         /* Driver takes ownership of state on successful commit. */
1452         return 0;
1453 fail:
1454         if (ret == -EDEADLK)
1455                 goto backoff;
1456
1457         drm_atomic_state_free(state);
1458
1459         return ret;
1460 backoff:
1461         drm_atomic_legacy_backoff(state);
1462         drm_atomic_state_clear(state);
1463
1464         goto retry;
1465 }
1466 EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
1467
1468 /**
1469  * drm_atomic_helper_plane_set_property - helper for plane prorties
1470  * @plane: DRM plane
1471  * @property: DRM property
1472  * @val: value of property
1473  *
1474  * Provides a default plane disable handler using the atomic driver interface.
1475  *
1476  * RETURNS:
1477  * Zero on success, error code on failure
1478  */
1479 int
1480 drm_atomic_helper_plane_set_property(struct drm_plane *plane,
1481                                     struct drm_property *property,
1482                                     uint64_t val)
1483 {
1484         struct drm_atomic_state *state;
1485         struct drm_plane_state *plane_state;
1486         int ret = 0;
1487
1488         state = drm_atomic_state_alloc(plane->dev);
1489         if (!state)
1490                 return -ENOMEM;
1491
1492         /* ->set_property is always called with all locks held. */
1493         state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
1494 retry:
1495         plane_state = drm_atomic_get_plane_state(state, plane);
1496         if (IS_ERR(plane_state)) {
1497                 ret = PTR_ERR(plane_state);
1498                 goto fail;
1499         }
1500
1501         ret = plane->funcs->atomic_set_property(plane, plane_state,
1502                                                property, val);
1503         if (ret)
1504                 goto fail;
1505
1506         ret = drm_atomic_commit(state);
1507         if (ret != 0)
1508                 goto fail;
1509
1510         /* Driver takes ownership of state on successful commit. */
1511         return 0;
1512 fail:
1513         if (ret == -EDEADLK)
1514                 goto backoff;
1515
1516         drm_atomic_state_free(state);
1517
1518         return ret;
1519 backoff:
1520         drm_atomic_legacy_backoff(state);
1521         drm_atomic_state_clear(state);
1522
1523         goto retry;
1524 }
1525 EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
1526
1527 /**
1528  * drm_atomic_helper_connector_set_property - helper for connector prorties
1529  * @connector: DRM connector
1530  * @property: DRM property
1531  * @val: value of property
1532  *
1533  * Provides a default plane disablle handler using the atomic driver interface.
1534  *
1535  * RETURNS:
1536  * Zero on success, error code on failure
1537  */
1538 int
1539 drm_atomic_helper_connector_set_property(struct drm_connector *connector,
1540                                     struct drm_property *property,
1541                                     uint64_t val)
1542 {
1543         struct drm_atomic_state *state;
1544         struct drm_connector_state *connector_state;
1545         int ret = 0;
1546
1547         state = drm_atomic_state_alloc(connector->dev);
1548         if (!state)
1549                 return -ENOMEM;
1550
1551         /* ->set_property is always called with all locks held. */
1552         state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
1553 retry:
1554         connector_state = drm_atomic_get_connector_state(state, connector);
1555         if (IS_ERR(connector_state)) {
1556                 ret = PTR_ERR(connector_state);
1557                 goto fail;
1558         }
1559
1560         ret = connector->funcs->atomic_set_property(connector, connector_state,
1561                                                property, val);
1562         if (ret)
1563                 goto fail;
1564
1565         ret = drm_atomic_commit(state);
1566         if (ret != 0)
1567                 goto fail;
1568
1569         /* Driver takes ownership of state on successful commit. */
1570         return 0;
1571 fail:
1572         if (ret == -EDEADLK)
1573                 goto backoff;
1574
1575         drm_atomic_state_free(state);
1576
1577         return ret;
1578 backoff:
1579         drm_atomic_legacy_backoff(state);
1580         drm_atomic_state_clear(state);
1581
1582         goto retry;
1583 }
1584 EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);