sys/dev/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 /**
  36  * DOC: overview
  37  *
  38  * This helper library provides implementations of check and commit functions on
  39  * top of the CRTC modeset helper callbacks and the plane helper callbacks. It
  40  * also provides convenience implementations for the atomic state handling
  41  * callbacks for drivers which don't need to subclass the drm core structures to
  42  * add their own additional internal state.
  43  *
  44  * This library also provides default implementations for the check callback in
  45  * drm_atomic_helper_check and for the commit callback with
  46  * drm_atomic_helper_commit. But the individual stages and callbacks are expose
  47  * to allow drivers to mix and match and e.g. use the plane helpers only
  48  * together with a driver private modeset implementation.
  49  *
  50  * This library also provides implementations for all the legacy driver
  51  * interfaces on top of the atomic interface. See drm_atomic_helper_set_config,
  52  * drm_atomic_helper_disable_plane, drm_atomic_helper_disable_plane and the
  53  * various functions to implement set_property callbacks. New drivers must not
  54  * implement these functions themselves but must use the provided helpers.
  55  */
  56 static void
  57 drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
  58                                 struct drm_plane_state *plane_state,
  59                                 struct drm_plane *plane)
  60 {
  61         struct drm_crtc_state *crtc_state;
  62
  63         if (plane->state->crtc) {
  64                 crtc_state = state->crtc_states[drm_crtc_index(plane->state->crtc)];
  65
  66                 if (WARN_ON(!crtc_state))
  67                         return;
  68
  69                 crtc_state->planes_changed = true;
  70         }
  71
  72         if (plane_state->crtc) {
  73                 crtc_state =
  74                         state->crtc_states[drm_crtc_index(plane_state->crtc)];
  75
  76                 if (WARN_ON(!crtc_state))
  77                         return;
  78
  79                 crtc_state->planes_changed = true;
  80         }
  81 }
  82
  83 static struct drm_crtc *
  84 get_current_crtc_for_encoder(struct drm_device *dev,
  85                              struct drm_encoder *encoder)
  86 {
  87         struct drm_mode_config *config = &dev->mode_config;
  88         struct drm_connector *connector;
  89
  90         WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
  91
  92         list_for_each_entry(connector, &config->connector_list, head) {
  93                 if (connector->state->best_encoder != encoder)
  94                         continue;
  95
  96                 return connector->state->crtc;
  97         }
  98
  99         return NULL;
 100 }
 101
 102 static int
 103 steal_encoder(struct drm_atomic_state *state,
 104               struct drm_encoder *encoder,
 105               struct drm_crtc *encoder_crtc)
 106 {
 107         struct drm_mode_config *config = &state->dev->mode_config;
 108         struct drm_crtc_state *crtc_state;
 109         struct drm_connector *connector;
 110         struct drm_connector_state *connector_state;
 111         int ret;
 112
 113         /*
 114          * We can only steal an encoder coming from a connector, which means we
 115          * must already hold the connection_mutex.
 116          */
 117         WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
 118
 119         DRM_DEBUG_KMS("[ENCODER:%d:%s] in use on [CRTC:%d], stealing it\n",
 120                       encoder->base.id, encoder->name,
 121                       encoder_crtc->base.id);
 122
 123         crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
 124         if (IS_ERR(crtc_state))
 125                 return PTR_ERR(crtc_state);
 126
 127         crtc_state->mode_changed = true;
 128
 129         list_for_each_entry(connector, &config->connector_list, head) {
 130                 if (connector->state->best_encoder != encoder)
 131                         continue;
 132
 133                 DRM_DEBUG_KMS("Stealing encoder from [CONNECTOR:%d:%s]\n",
 134                               connector->base.id,
 135                               connector->name);
 136
 137                 connector_state = drm_atomic_get_connector_state(state,
 138                                                                  connector);
 139                 if (IS_ERR(connector_state))
 140                         return PTR_ERR(connector_state);
 141
 142                 ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
 143                 if (ret)
 144                         return ret;
 145                 connector_state->best_encoder = NULL;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int
 152 update_connector_routing(struct drm_atomic_state *state, int conn_idx)
 153 {
 154         struct drm_connector_helper_funcs *funcs;
 155         struct drm_encoder *new_encoder;
 156         struct drm_crtc *encoder_crtc;
 157         struct drm_connector *connector;
 158         struct drm_connector_state *connector_state;
 159         struct drm_crtc_state *crtc_state;
 160         int idx, ret;
 161
 162         connector = state->connectors[conn_idx];
 163         connector_state = state->connector_states[conn_idx];
 164
 165         if (!connector)
 166                 return 0;
 167
 168         DRM_DEBUG_KMS("Updating routing for [CONNECTOR:%d:%s]\n",
 169                         connector->base.id,
 170                         connector->name);
 171
 172         if (connector->state->crtc != connector_state->crtc) {
 173                 if (connector->state->crtc) {
 174                         idx = drm_crtc_index(connector->state->crtc);
 175
 176                         crtc_state = state->crtc_states[idx];
 177                         crtc_state->mode_changed = true;
 178                 }
 179
 180                 if (connector_state->crtc) {
 181                         idx = drm_crtc_index(connector_state->crtc);
 182
 183                         crtc_state = state->crtc_states[idx];
 184                         crtc_state->mode_changed = true;
 185                 }
 186         }
 187
 188         if (!connector_state->crtc) {
 189                 DRM_DEBUG_KMS("Disabling [CONNECTOR:%d:%s]\n",
 190                                 connector->base.id,
 191                                 connector->name);
 192
 193                 connector_state->best_encoder = NULL;
 194
 195                 return 0;
 196         }
 197
 198         funcs = connector->helper_private;
 199         new_encoder = funcs->best_encoder(connector);
 200
 201         if (!new_encoder) {
 202                 DRM_DEBUG_KMS("No suitable encoder found for [CONNECTOR:%d:%s]\n",
 203                               connector->base.id,
 204                               connector->name);
 205                 return -EINVAL;
 206         }
 207
 208         if (new_encoder == connector_state->best_encoder) {
 209                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
 210                               connector->base.id,
 211                               connector->name,
 212                               new_encoder->base.id,
 213                               new_encoder->name,
 214                               connector_state->crtc->base.id);
 215
 216                 return 0;
 217         }
 218
 219         encoder_crtc = get_current_crtc_for_encoder(state->dev,
 220                                                     new_encoder);
 221
 222         if (encoder_crtc) {
 223                 ret = steal_encoder(state, new_encoder, encoder_crtc);
 224                 if (ret) {
 225                         DRM_DEBUG_KMS("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
 226                                       connector->base.id,
 227                                       connector->name);
 228                         return ret;
 229                 }
 230         }
 231
 232         connector_state->best_encoder = new_encoder;
 233         idx = drm_crtc_index(connector_state->crtc);
 234
 235         crtc_state = state->crtc_states[idx];
 236         crtc_state->mode_changed = true;
 237
 238         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
 239                       connector->base.id,
 240                       connector->name,
 241                       new_encoder->base.id,
 242                       new_encoder->name,
 243                       connector_state->crtc->base.id);
 244
 245         return 0;
 246 }
 247
 248 static int
 249 mode_fixup(struct drm_atomic_state *state)
 250 {
 251         int ncrtcs = state->dev->mode_config.num_crtc;
 252         struct drm_crtc_state *crtc_state;
 253         struct drm_connector_state *conn_state;
 254         int i;
 255         bool ret;
 256
 257         for (i = 0; i < ncrtcs; i++) {
 258                 crtc_state = state->crtc_states[i];
 259
 260                 if (!crtc_state || !crtc_state->mode_changed)
 261                         continue;
 262
 263                 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
 264         }
 265
 266         for (i = 0; i < state->num_connector; i++) {
 267                 struct drm_encoder_helper_funcs *funcs;
 268                 struct drm_encoder *encoder;
 269
 270                 conn_state = state->connector_states[i];
 271
 272                 if (!conn_state)
 273                         continue;
 274
 275                 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
 276
 277                 if (!conn_state->crtc || !conn_state->best_encoder)
 278                         continue;
 279
 280                 crtc_state =
 281                         state->crtc_states[drm_crtc_index(conn_state->crtc)];
 282
 283                 /*
 284                  * Each encoder has at most one connector (since we always steal
 285                  * it away), so we won't call ->mode_fixup twice.
 286                  */
 287                 encoder = conn_state->best_encoder;
 288                 funcs = encoder->helper_private;
 289
 290                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 291                         ret = encoder->bridge->funcs->mode_fixup(
 292                                         encoder->bridge, &crtc_state->mode,
 293                                         &crtc_state->adjusted_mode);
 294                         if (!ret) {
 295                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 296                                 return -EINVAL;
 297                         }
 298                 }
 299
 300                 if (funcs->atomic_check) {
 301                         ret = funcs->atomic_check(encoder, crtc_state,
 302                                                   conn_state);
 303                         if (ret) {
 304                                 DRM_DEBUG_KMS("[ENCODER:%d:%s] check failed\n",
 305                                               encoder->base.id, encoder->name);
 306                                 return ret;
 307                         }
 308                 } else {
 309                         ret = funcs->mode_fixup(encoder, &crtc_state->mode,
 310                                                 &crtc_state->adjusted_mode);
 311                         if (!ret) {
 312                                 DRM_DEBUG_KMS("[ENCODER:%d:%s] fixup failed\n",
 313                                               encoder->base.id, encoder->name);
 314                                 return -EINVAL;
 315                         }
 316                 }
 317         }
 318
 319         for (i = 0; i < ncrtcs; i++) {
 320                 struct drm_crtc_helper_funcs *funcs;
 321                 struct drm_crtc *crtc;
 322
 323                 crtc_state = state->crtc_states[i];
 324                 crtc = state->crtcs[i];
 325
 326                 if (!crtc_state || !crtc_state->mode_changed)
 327                         continue;
 328
 329                 funcs = crtc->helper_private;
 330                 ret = funcs->mode_fixup(crtc, &crtc_state->mode,
 331                                         &crtc_state->adjusted_mode);
 332                 if (!ret) {
 333                         DRM_DEBUG_KMS("[CRTC:%d] fixup failed\n",
 334                                       crtc->base.id);
 335                         return -EINVAL;
 336                 }
 337         }
 338
 339         return 0;
 340 }
 341
 342 static bool
 343 needs_modeset(struct drm_crtc_state *state)
 344 {
 345         return state->mode_changed || state->active_changed;
 346 }
 347
 348 /**
 349  * drm_atomic_helper_check - validate state object for modeset changes
 350  * @dev: DRM device
 351  * @state: the driver state object
 352  *
 353  * Check the state object to see if the requested state is physically possible.
 354  * This does all the crtc and connector related computations for an atomic
 355  * update. It computes and updates crtc_state->mode_changed, adds any additional
 356  * connectors needed for full modesets and calls down into ->mode_fixup
 357  * functions of the driver backend.
 358  *
 359  * IMPORTANT:
 360  *
 361  * Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
 362  * plane update can't be done without a full modeset) _must_ call this function
 363  * afterwards after that change. It is permitted to call this function multiple
 364  * times for the same update, e.g. when the ->atomic_check functions depend upon
 365  * the adjusted dotclock for fifo space allocation and watermark computation.
 366  *
 367  * RETURNS
 368  * Zero for success or -errno
 369  */
 370 int
 371 drm_atomic_helper_check_modeset(struct drm_device *dev,
 372                                 struct drm_atomic_state *state)
 373 {
 374         int ncrtcs = dev->mode_config.num_crtc;
 375         struct drm_crtc *crtc;
 376         struct drm_crtc_state *crtc_state;
 377         int i, ret;
 378
 379         for (i = 0; i < ncrtcs; i++) {
 380                 crtc = state->crtcs[i];
 381                 crtc_state = state->crtc_states[i];
 382
 383                 if (!crtc)
 384                         continue;
 385
 386                 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
 387                         DRM_DEBUG_KMS("[CRTC:%d] mode changed\n",
 388                                       crtc->base.id);
 389                         crtc_state->mode_changed = true;
 390                 }
 391
 392                 if (crtc->state->enable != crtc_state->enable) {
 393                         DRM_DEBUG_KMS("[CRTC:%d] enable changed\n",
 394                                       crtc->base.id);
 395                         crtc_state->mode_changed = true;
 396                 }
 397         }
 398
 399         for (i = 0; i < state->num_connector; i++) {
 400                 /*
 401                  * This only sets crtc->mode_changed for routing changes,
 402                  * drivers must set crtc->mode_changed themselves when connector
 403                  * properties need to be updated.
 404                  */
 405                 ret = update_connector_routing(state, i);
 406                 if (ret)
 407                         return ret;
 408         }
 409
 410         /*
 411          * After all the routing has been prepared we need to add in any
 412          * connector which is itself unchanged, but who's crtc changes it's
 413          * configuration. This must be done before calling mode_fixup in case a
 414          * crtc only changed its mode but has the same set of connectors.
 415          */
 416         for (i = 0; i < ncrtcs; i++) {
 417                 int num_connectors;
 418
 419                 crtc = state->crtcs[i];
 420                 crtc_state = state->crtc_states[i];
 421
 422                 if (!crtc)
 423                         continue;
 424
 425                 /*
 426                  * We must set ->active_changed after walking connectors for
 427                  * otherwise an update that only changes active would result in
 428                  * a full modeset because update_connector_routing force that.
 429                  */
 430                 if (crtc->state->active != crtc_state->active) {
 431                         DRM_DEBUG_KMS("[CRTC:%d] active changed\n",
 432                                       crtc->base.id);
 433                         crtc_state->active_changed = true;
 434                 }
 435
 436                 if (!needs_modeset(crtc_state))
 437                         continue;
 438
 439                 DRM_DEBUG_KMS("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
 440                               crtc->base.id,
 441                               crtc_state->enable ? 'y' : 'n',
 442                               crtc_state->active ? 'y' : 'n');
 443
 444                 ret = drm_atomic_add_affected_connectors(state, crtc);
 445                 if (ret != 0)
 446                         return ret;
 447
 448                 num_connectors = drm_atomic_connectors_for_crtc(state,
 449                                                                 crtc);
 450
 451                 if (crtc_state->enable != !!num_connectors) {
 452                         DRM_DEBUG_KMS("[CRTC:%d] enabled/connectors mismatch\n",
 453                                       crtc->base.id);
 454
 455                         return -EINVAL;
 456                 }
 457         }
 458
 459         return mode_fixup(state);
 460 }
 461 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
 462
 463 /**
 464  * drm_atomic_helper_check - validate state object for modeset changes
 465  * @dev: DRM device
 466  * @state: the driver state object
 467  *
 468  * Check the state object to see if the requested state is physically possible.
 469  * This does all the plane update related checks using by calling into the
 470  * ->atomic_check hooks provided by the driver.
 471  *
 472  * RETURNS
 473  * Zero for success or -errno
 474  */
 475 int
 476 drm_atomic_helper_check_planes(struct drm_device *dev,
 477                                struct drm_atomic_state *state)
 478 {
 479         int nplanes = dev->mode_config.num_total_plane;
 480         int ncrtcs = dev->mode_config.num_crtc;
 481         int i, ret = 0;
 482
 483         for (i = 0; i < nplanes; i++) {
 484                 struct drm_plane_helper_funcs *funcs;
 485                 struct drm_plane *plane = state->planes[i];
 486                 struct drm_plane_state *plane_state = state->plane_states[i];
 487
 488                 if (!plane)
 489                         continue;
 490
 491                 funcs = plane->helper_private;
 492
 493                 drm_atomic_helper_plane_changed(state, plane_state, plane);
 494
 495                 if (!funcs || !funcs->atomic_check)
 496                         continue;
 497
 498                 ret = funcs->atomic_check(plane, plane_state);
 499                 if (ret) {
 500                         DRM_DEBUG_KMS("[PLANE:%d] atomic driver check failed\n",
 501                                       plane->base.id);
 502                         return ret;
 503                 }
 504         }
 505
 506         for (i = 0; i < ncrtcs; i++) {
 507                 struct drm_crtc_helper_funcs *funcs;
 508                 struct drm_crtc *crtc = state->crtcs[i];
 509
 510                 if (!crtc)
 511                         continue;
 512
 513                 funcs = crtc->helper_private;
 514
 515                 if (!funcs || !funcs->atomic_check)
 516                         continue;
 517
 518                 ret = funcs->atomic_check(crtc, state->crtc_states[i]);
 519                 if (ret) {
 520                         DRM_DEBUG_KMS("[CRTC:%d] atomic driver check failed\n",
 521                                       crtc->base.id);
 522                         return ret;
 523                 }
 524         }
 525
 526         return ret;
 527 }
 528 EXPORT_SYMBOL(drm_atomic_helper_check_planes);
 529
 530 /**
 531  * drm_atomic_helper_check - validate state object
 532  * @dev: DRM device
 533  * @state: the driver state object
 534  *
 535  * Check the state object to see if the requested state is physically possible.
 536  * Only crtcs and planes have check callbacks, so for any additional (global)
 537  * checking that a driver needs it can simply wrap that around this function.
 538  * Drivers without such needs can directly use this as their ->atomic_check()
 539  * callback.
 540  *
 541  * This just wraps the two parts of the state checking for planes and modeset
 542  * state in the default order: First it calls drm_atomic_helper_check_modeset()
 543  * and then drm_atomic_helper_check_planes(). The assumption is that the
 544  * ->atomic_check functions depend upon an updated adjusted_mode.clock to
 545  * e.g. properly compute watermarks.
 546  *
 547  * RETURNS
 548  * Zero for success or -errno
 549  */
 550 int drm_atomic_helper_check(struct drm_device *dev,
 551                             struct drm_atomic_state *state)
 552 {
 553         int ret;
 554
 555         ret = drm_atomic_helper_check_modeset(dev, state);
 556         if (ret)
 557                 return ret;
 558
 559         ret = drm_atomic_helper_check_planes(dev, state);
 560         if (ret)
 561                 return ret;
 562
 563         return ret;
 564 }
 565 EXPORT_SYMBOL(drm_atomic_helper_check);
 566
 567 static void
 568 disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 569 {
 570         int ncrtcs = old_state->dev->mode_config.num_crtc;
 571         int i;
 572
 573         for (i = 0; i < old_state->num_connector; i++) {
 574                 struct drm_connector_state *old_conn_state;
 575                 struct drm_connector *connector;
 576                 struct drm_encoder_helper_funcs *funcs;
 577                 struct drm_encoder *encoder;
 578                 struct drm_crtc_state *old_crtc_state;
 579
 580                 old_conn_state = old_state->connector_states[i];
 581                 connector = old_state->connectors[i];
 582
 583                 /* Shut down everything that's in the changeset and currently
 584                  * still on. So need to check the old, saved state. */
 585                 if (!old_conn_state || !old_conn_state->crtc)
 586                         continue;
 587
 588                 old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
 589
 590                 if (!old_crtc_state->active)
 591                         continue;
 592
 593                 encoder = old_conn_state->best_encoder;
 594
 595                 /* We shouldn't get this far if we didn't previously have
 596                  * an encoder.. but WARN_ON() rather than explode.
 597                  */
 598                 if (WARN_ON(!encoder))
 599                         continue;
 600
 601                 funcs = encoder->helper_private;
 602
 603                 DRM_DEBUG_KMS("disabling [ENCODER:%d:%s]\n",
 604                               encoder->base.id, encoder->name);
 605
 606                 /*
 607                  * Each encoder has at most one connector (since we always steal
 608                  * it away), so we won't call call disable hooks twice.
 609                  */
 610                 if (encoder->bridge)
 611                         encoder->bridge->funcs->disable(encoder->bridge);
 612
 613                 /* Right function depends upon target state. */
 614                 if (connector->state->crtc && funcs->prepare)
 615                         funcs->prepare(encoder);
 616                 else if (funcs->disable)
 617                         funcs->disable(encoder);
 618                 else
 619                         funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
 620
 621                 if (encoder->bridge)
 622                         encoder->bridge->funcs->post_disable(encoder->bridge);
 623         }
 624
 625         for (i = 0; i < ncrtcs; i++) {
 626                 struct drm_crtc_helper_funcs *funcs;
 627                 struct drm_crtc *crtc;
 628                 struct drm_crtc_state *old_crtc_state;
 629
 630                 crtc = old_state->crtcs[i];
 631                 old_crtc_state = old_state->crtc_states[i];
 632
 633                 /* Shut down everything that needs a full modeset. */
 634                 if (!crtc || !needs_modeset(crtc->state))
 635                         continue;
 636
 637                 if (!old_crtc_state->active)
 638                         continue;
 639
 640                 funcs = crtc->helper_private;
 641
 642                 DRM_DEBUG_KMS("disabling [CRTC:%d]\n",
 643                               crtc->base.id);
 644
 645
 646                 /* Right function depends upon target state. */
 647                 if (crtc->state->enable && funcs->prepare)
 648                         funcs->prepare(crtc);
 649                 else if (funcs->disable)
 650                         funcs->disable(crtc);
 651                 else
 652                         funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 653         }
 654 }
 655
 656 static void
 657 set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
 658 {
 659         int ncrtcs = old_state->dev->mode_config.num_crtc;
 660         int i;
 661
 662         /* clear out existing links */
 663         for (i = 0; i < old_state->num_connector; i++) {
 664                 struct drm_connector *connector;
 665
 666                 connector = old_state->connectors[i];
 667
 668                 if (!connector || !connector->encoder)
 669                         continue;
 670
 671                 WARN_ON(!connector->encoder->crtc);
 672
 673                 connector->encoder->crtc = NULL;
 674                 connector->encoder = NULL;
 675         }
 676
 677         /* set new links */
 678         for (i = 0; i < old_state->num_connector; i++) {
 679                 struct drm_connector *connector;
 680
 681                 connector = old_state->connectors[i];
 682
 683                 if (!connector || !connector->state->crtc)
 684                         continue;
 685
 686                 if (WARN_ON(!connector->state->best_encoder))
 687                         continue;
 688
 689                 connector->encoder = connector->state->best_encoder;
 690                 connector->encoder->crtc = connector->state->crtc;
 691         }
 692
 693         /* set legacy state in the crtc structure */
 694         for (i = 0; i < ncrtcs; i++) {
 695                 struct drm_crtc *crtc;
 696
 697                 crtc = old_state->crtcs[i];
 698
 699                 if (!crtc)
 700                         continue;
 701
 702                 crtc->mode = crtc->state->mode;
 703                 crtc->enabled = crtc->state->enable;
 704                 crtc->x = crtc->primary->state->src_x >> 16;
 705                 crtc->y = crtc->primary->state->src_y >> 16;
 706         }
 707 }
 708
 709 static void
 710 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
 711 {
 712         int ncrtcs = old_state->dev->mode_config.num_crtc;
 713         int i;
 714
 715         for (i = 0; i < ncrtcs; i++) {
 716                 struct drm_crtc_helper_funcs *funcs;
 717                 struct drm_crtc *crtc;
 718
 719                 crtc = old_state->crtcs[i];
 720
 721                 if (!crtc || !crtc->state->mode_changed)
 722                         continue;
 723
 724                 funcs = crtc->helper_private;
 725
 726                 if (crtc->state->enable) {
 727                         DRM_DEBUG_KMS("modeset on [CRTC:%d]\n",
 728                                       crtc->base.id);
 729
 730                         funcs->mode_set_nofb(crtc);
 731                 }
 732         }
 733
 734         for (i = 0; i < old_state->num_connector; i++) {
 735                 struct drm_connector *connector;
 736                 struct drm_crtc_state *new_crtc_state;
 737                 struct drm_encoder_helper_funcs *funcs;
 738                 struct drm_encoder *encoder;
 739                 struct drm_display_mode *mode, *adjusted_mode;
 740
 741                 connector = old_state->connectors[i];
 742
 743                 if (!connector || !connector->state->best_encoder)
 744                         continue;
 745
 746                 encoder = connector->state->best_encoder;
 747                 funcs = encoder->helper_private;
 748                 new_crtc_state = connector->state->crtc->state;
 749                 mode = &new_crtc_state->mode;
 750                 adjusted_mode = &new_crtc_state->adjusted_mode;
 751
 752                 if (!new_crtc_state->mode_changed)
 753                         continue;
 754
 755                 DRM_DEBUG_KMS("modeset on [ENCODER:%d:%s]\n",
 756                               encoder->base.id, encoder->name);
 757
 758                 /*
 759                  * Each encoder has at most one connector (since we always steal
 760                  * it away), so we won't call call mode_set hooks twice.
 761                  */
 762                 funcs->mode_set(encoder, mode, adjusted_mode);
 763
 764                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 765                         encoder->bridge->funcs->mode_set(encoder->bridge,
 766                                                          mode, adjusted_mode);
 767         }
 768 }
 769
 770 /**
 771  * drm_atomic_helper_commit_pre_planes - modeset commit before plane updates
 772  * @dev: DRM device
 773  * @state: atomic state
 774  *
 775  * This function commits the modeset changes that need to be committed before
 776  * updating planes. It shuts down all the outputs that need to be shut down and
 777  * prepares them (if required) with the new mode.
 778  */
 779 void drm_atomic_helper_commit_pre_planes(struct drm_device *dev,
 780                                          struct drm_atomic_state *state)
 781 {
 782         disable_outputs(dev, state);
 783         set_routing_links(dev, state);
 784         crtc_set_mode(dev, state);
 785 }
 786 EXPORT_SYMBOL(drm_atomic_helper_commit_pre_planes);
 787
 788 /**
 789  * drm_atomic_helper_commit_post_planes - modeset commit after plane updates
 790  * @dev: DRM device
 791  * @old_state: atomic state object with old state structures
 792  *
 793  * This function commits the modeset changes that need to be committed after
 794  * updating planes: It enables all the outputs with the new configuration which
 795  * had to be turned off for the update.
 796  */
 797 void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
 798                                           struct drm_atomic_state *old_state)
 799 {
 800         int ncrtcs = old_state->dev->mode_config.num_crtc;
 801         int i;
 802
 803         for (i = 0; i < ncrtcs; i++) {
 804                 struct drm_crtc_helper_funcs *funcs;
 805                 struct drm_crtc *crtc;
 806
 807                 crtc = old_state->crtcs[i];
 808
 809                 /* Need to filter out CRTCs where only planes change. */
 810                 if (!crtc || !needs_modeset(crtc->state))
 811                         continue;
 812
 813                 if (!crtc->state->active)
 814                         continue;
 815
 816                 funcs = crtc->helper_private;
 817
 818                 if (crtc->state->enable) {
 819                         DRM_DEBUG_KMS("enabling [CRTC:%d]\n",
 820                                       crtc->base.id);
 821
 822                         if (funcs->enable)
 823                                 funcs->enable(crtc);
 824                         else
 825                                 funcs->commit(crtc);
 826                 }
 827         }
 828
 829         for (i = 0; i < old_state->num_connector; i++) {
 830                 struct drm_connector *connector;
 831                 struct drm_encoder_helper_funcs *funcs;
 832                 struct drm_encoder *encoder;
 833
 834                 connector = old_state->connectors[i];
 835
 836                 if (!connector || !connector->state->best_encoder)
 837                         continue;
 838
 839                 if (!connector->state->crtc->state->active)
 840                         continue;
 841
 842                 encoder = connector->state->best_encoder;
 843                 funcs = encoder->helper_private;
 844
 845                 DRM_DEBUG_KMS("enabling [ENCODER:%d:%s]\n",
 846                               encoder->base.id, encoder->name);
 847
 848                 /*
 849                  * Each encoder has at most one connector (since we always steal
 850                  * it away), so we won't call call enable hooks twice.
 851                  */
 852                 if (encoder->bridge)
 853                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 854
 855                 if (funcs->enable)
 856                         funcs->enable(encoder);
 857                 else
 858                         funcs->commit(encoder);
 859
 860                 if (encoder->bridge)
 861                         encoder->bridge->funcs->enable(encoder->bridge);
 862         }
 863 }
 864 EXPORT_SYMBOL(drm_atomic_helper_commit_post_planes);
 865
 866 static void wait_for_fences(struct drm_device *dev,
 867                             struct drm_atomic_state *state)
 868 {
 869         int nplanes = dev->mode_config.num_total_plane;
 870         int i;
 871
 872         for (i = 0; i < nplanes; i++) {
 873                 struct drm_plane *plane = state->planes[i];
 874
 875                 if (!plane || !plane->state->fence)
 876                         continue;
 877
 878                 WARN_ON(!plane->state->fb);
 879
 880 #if 0
 881                 fence_wait(plane->state->fence, false);
 882                 fence_put(plane->state->fence);
 883 #endif
 884                 plane->state->fence = NULL;
 885         }
 886 }
 887
 888 static bool framebuffer_changed(struct drm_device *dev,
 889                                 struct drm_atomic_state *old_state,
 890                                 struct drm_crtc *crtc)
 891 {
 892         struct drm_plane *plane;
 893         struct drm_plane_state *old_plane_state;
 894         int nplanes = old_state->dev->mode_config.num_total_plane;
 895         int i;
 896
 897         for (i = 0; i < nplanes; i++) {
 898                 plane = old_state->planes[i];
 899                 old_plane_state = old_state->plane_states[i];
 900
 901                 if (!plane)
 902                         continue;
 903
 904                 if (plane->state->crtc != crtc &&
 905                     old_plane_state->crtc != crtc)
 906                         continue;
 907
 908                 if (plane->state->fb != old_plane_state->fb)
 909                         return true;
 910         }
 911
 912         return false;
 913 }
 914
 915 /**
 916  * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
 917  * @dev: DRM device
 918  * @old_state: atomic state object with old state structures
 919  *
 920  * Helper to, after atomic commit, wait for vblanks on all effected
 921  * crtcs (ie. before cleaning up old framebuffers using
 922  * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
 923  * framebuffers have actually changed to optimize for the legacy cursor and
 924  * plane update use-case.
 925  */
 926 void
 927 drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
 928                 struct drm_atomic_state *old_state)
 929 {
 930         struct drm_crtc *crtc;
 931         struct drm_crtc_state *old_crtc_state;
 932         int ncrtcs = old_state->dev->mode_config.num_crtc;
 933         int i, ret;
 934
 935         for (i = 0; i < ncrtcs; i++) {
 936                 crtc = old_state->crtcs[i];
 937                 old_crtc_state = old_state->crtc_states[i];
 938
 939                 if (!crtc)
 940                         continue;
 941
 942                 /* No one cares about the old state, so abuse it for tracking
 943                  * and store whether we hold a vblank reference (and should do a
 944                  * vblank wait) in the ->enable boolean. */
 945                 old_crtc_state->enable = false;
 946
 947                 if (!crtc->state->enable)
 948                         continue;
 949
 950                 /* Legacy cursor ioctls are completely unsynced, and userspace
 951                  * relies on that (by doing tons of cursor updates). */
 952                 if (old_state->legacy_cursor_update)
 953                         continue;
 954
 955                 if (!framebuffer_changed(dev, old_state, crtc))
 956                         continue;
 957
 958                 ret = drm_crtc_vblank_get(crtc);
 959                 if (ret != 0)
 960                         continue;
 961
 962                 old_crtc_state->enable = true;
 963                 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
 964         }
 965
 966         for (i = 0; i < ncrtcs; i++) {
 967                 crtc = old_state->crtcs[i];
 968                 old_crtc_state = old_state->crtc_states[i];
 969
 970                 if (!crtc || !old_crtc_state->enable)
 971                         continue;
 972
 973                 ret = wait_event_timeout(dev->vblank[i].queue,
 974                                 old_crtc_state->last_vblank_count !=
 975                                         drm_vblank_count(dev, i),
 976                                 msecs_to_jiffies(50));
 977
 978                 drm_crtc_vblank_put(crtc);
 979         }
 980 }
 981 EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
 982
 983 /**
 984  * drm_atomic_helper_commit - commit validated state object
 985  * @dev: DRM device
 986  * @state: the driver state object
 987  * @async: asynchronous commit
 988  *
 989  * This function commits a with drm_atomic_helper_check() pre-validated state
 990  * object. This can still fail when e.g. the framebuffer reservation fails. For
 991  * now this doesn't implement asynchronous commits.
 992  *
 993  * RETURNS
 994  * Zero for success or -errno.
 995  */
 996 int drm_atomic_helper_commit(struct drm_device *dev,
 997                              struct drm_atomic_state *state,
 998                              bool async)
 999 {
1000         int ret;
1001
1002         if (async)
1003                 return -EBUSY;
1004
1005         ret = drm_atomic_helper_prepare_planes(dev, state);
1006         if (ret)
1007                 return ret;
1008
1009         /*
1010          * This is the point of no return - everything below never fails except
1011          * when the hw goes bonghits. Which means we can commit the new state on
1012          * the software side now.
1013          */
1014
1015         drm_atomic_helper_swap_state(dev, state);
1016
1017         /*
1018          * Everything below can be run asynchronously without the need to grab
1019          * any modeset locks at all under one conditions: It must be guaranteed
1020          * that the asynchronous work has either been cancelled (if the driver
1021          * supports it, which at least requires that the framebuffers get
1022          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
1023          * before the new state gets committed on the software side with
1024          * drm_atomic_helper_swap_state().
1025          *
1026          * This scheme allows new atomic state updates to be prepared and
1027          * checked in parallel to the asynchronous completion of the previous
1028          * update. Which is important since compositors need to figure out the
1029          * composition of the next frame right after having submitted the
1030          * current layout.
1031          */
1032
1033         wait_for_fences(dev, state);
1034
1035         drm_atomic_helper_commit_pre_planes(dev, state);
1036
1037         drm_atomic_helper_commit_planes(dev, state);
1038
1039         drm_atomic_helper_commit_post_planes(dev, state);
1040
1041         drm_atomic_helper_wait_for_vblanks(dev, state);
1042
1043         drm_atomic_helper_cleanup_planes(dev, state);
1044
1045         drm_atomic_state_free(state);
1046
1047         return 0;
1048 }
1049 EXPORT_SYMBOL(drm_atomic_helper_commit);
1050
1051 /**
1052  * DOC: implementing async commit
1053  *
1054  * For now the atomic helpers don't support async commit directly. If there is
1055  * real need it could be added though, using the dma-buf fence infrastructure
1056  * for generic synchronization with outstanding rendering.
1057  *
1058  * For now drivers have to implement async commit themselves, with the following
1059  * sequence being the recommended one:
1060  *
1061  * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
1062  * which commit needs to call which can fail, so we want to run it first and
1063  * synchronously.
1064  *
1065  * 2. Synchronize with any outstanding asynchronous commit worker threads which
1066  * might be affected the new state update. This can be done by either cancelling
1067  * or flushing the work items, depending upon whether the driver can deal with
1068  * cancelled updates. Note that it is important to ensure that the framebuffer
1069  * cleanup is still done when cancelling.
1070  *
1071  * For sufficient parallelism it is recommended to have a work item per crtc
1072  * (for updates which don't touch global state) and a global one. Then we only
1073  * need to synchronize with the crtc work items for changed crtcs and the global
1074  * work item, which allows nice concurrent updates on disjoint sets of crtcs.
1075  *
1076  * 3. The software state is updated synchronously with
1077  * drm_atomic_helper_swap_state. Doing this under the protection of all modeset
1078  * locks means concurrent callers never see inconsistent state. And doing this
1079  * while it's guaranteed that no relevant async worker runs means that async
1080  * workers do not need grab any locks. Actually they must not grab locks, for
1081  * otherwise the work flushing will deadlock.
1082  *
1083  * 4. Schedule a work item to do all subsequent steps, using the split-out
1084  * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1085  * then cleaning up the framebuffers after the old framebuffer is no longer
1086  * being displayed.
1087  */
1088
1089 /**
1090  * drm_atomic_helper_prepare_planes - prepare plane resources after commit
1091  * @dev: DRM device
1092  * @state: atomic state object with old state structures
1093  *
1094  * This function prepares plane state, specifically framebuffers, for the new
1095  * configuration. If any failure is encountered this function will call
1096  * ->cleanup_fb on any already successfully prepared framebuffer.
1097  *
1098  * Returns:
1099  * 0 on success, negative error code on failure.
1100  */
1101 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
1102                                      struct drm_atomic_state *state)
1103 {
1104         int nplanes = dev->mode_config.num_total_plane;
1105         int ret, i;
1106
1107         for (i = 0; i < nplanes; i++) {
1108                 struct drm_plane_helper_funcs *funcs;
1109                 struct drm_plane *plane = state->planes[i];
1110                 struct drm_framebuffer *fb;
1111
1112                 if (!plane)
1113                         continue;
1114
1115                 funcs = plane->helper_private;
1116
1117                 fb = state->plane_states[i]->fb;
1118
1119                 if (fb && funcs->prepare_fb) {
1120                         ret = funcs->prepare_fb(plane, fb);
1121                         if (ret)
1122                                 goto fail;
1123                 }
1124         }
1125
1126         return 0;
1127
1128 fail:
1129         for (i--; i >= 0; i--) {
1130                 struct drm_plane_helper_funcs *funcs;
1131                 struct drm_plane *plane = state->planes[i];
1132                 struct drm_framebuffer *fb;
1133
1134                 if (!plane)
1135                         continue;
1136
1137                 funcs = plane->helper_private;
1138
1139                 fb = state->plane_states[i]->fb;
1140
1141                 if (fb && funcs->cleanup_fb)
1142                         funcs->cleanup_fb(plane, fb);
1143
1144         }
1145
1146         return ret;
1147 }
1148 EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
1149
1150 /**
1151  * drm_atomic_helper_commit_planes - commit plane state
1152  * @dev: DRM device
1153  * @old_state: atomic state object with old state structures
1154  *
1155  * This function commits the new plane state using the plane and atomic helper
1156  * functions for planes and crtcs. It assumes that the atomic state has already
1157  * been pushed into the relevant object state pointers, since this step can no
1158  * longer fail.
1159  *
1160  * It still requires the global state object @old_state to know which planes and
1161  * crtcs need to be updated though.
1162  */
1163 void drm_atomic_helper_commit_planes(struct drm_device *dev,
1164                                      struct drm_atomic_state *old_state)
1165 {
1166         int nplanes = dev->mode_config.num_total_plane;
1167         int ncrtcs = dev->mode_config.num_crtc;
1168         int i;
1169
1170         for (i = 0; i < ncrtcs; i++) {
1171                 struct drm_crtc_helper_funcs *funcs;
1172                 struct drm_crtc *crtc = old_state->crtcs[i];
1173
1174                 if (!crtc)
1175                         continue;
1176
1177                 funcs = crtc->helper_private;
1178
1179                 if (!funcs || !funcs->atomic_begin)
1180                         continue;
1181
1182                 funcs->atomic_begin(crtc);
1183         }
1184
1185         for (i = 0; i < nplanes; i++) {
1186                 struct drm_plane_helper_funcs *funcs;
1187                 struct drm_plane *plane = old_state->planes[i];
1188                 struct drm_plane_state *old_plane_state;
1189
1190                 if (!plane)
1191                         continue;
1192
1193                 funcs = plane->helper_private;
1194
1195                 if (!funcs)
1196                         continue;
1197
1198                 old_plane_state = old_state->plane_states[i];
1199
1200                 /*
1201                  * Special-case disabling the plane if drivers support it.
1202                  */
1203                 if (drm_atomic_plane_disabling(plane, old_plane_state) &&
1204                     funcs->atomic_disable)
1205                         funcs->atomic_disable(plane, old_plane_state);
1206                 else
1207                         funcs->atomic_update(plane, old_plane_state);
1208         }
1209
1210         for (i = 0; i < ncrtcs; i++) {
1211                 struct drm_crtc_helper_funcs *funcs;
1212                 struct drm_crtc *crtc = old_state->crtcs[i];
1213
1214                 if (!crtc)
1215                         continue;
1216
1217                 funcs = crtc->helper_private;
1218
1219                 if (!funcs || !funcs->atomic_flush)
1220                         continue;
1221
1222                 funcs->atomic_flush(crtc);
1223         }
1224 }
1225 EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
1226
1227 /**
1228  * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
1229  * @dev: DRM device
1230  * @old_state: atomic state object with old state structures
1231  *
1232  * This function cleans up plane state, specifically framebuffers, from the old
1233  * configuration. Hence the old configuration must be perserved in @old_state to
1234  * be able to call this function.
1235  *
1236  * This function must also be called on the new state when the atomic update
1237  * fails at any point after calling drm_atomic_helper_prepare_planes().
1238  */
1239 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
1240                                       struct drm_atomic_state *old_state)
1241 {
1242         int nplanes = dev->mode_config.num_total_plane;
1243         int i;
1244
1245         for (i = 0; i < nplanes; i++) {
1246                 struct drm_plane_helper_funcs *funcs;
1247                 struct drm_plane *plane = old_state->planes[i];
1248                 struct drm_framebuffer *old_fb;
1249
1250                 if (!plane)
1251                         continue;
1252
1253                 funcs = plane->helper_private;
1254
1255                 old_fb = old_state->plane_states[i]->fb;
1256
1257                 if (old_fb && funcs->cleanup_fb)
1258                         funcs->cleanup_fb(plane, old_fb);
1259         }
1260 }
1261 EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1262
1263 /**
1264  * drm_atomic_helper_swap_state - store atomic state into current sw state
1265  * @dev: DRM device
1266  * @state: atomic state
1267  *
1268  * This function stores the atomic state into the current state pointers in all
1269  * driver objects. It should be called after all failing steps have been done
1270  * and succeeded, but before the actual hardware state is committed.
1271  *
1272  * For cleanup and error recovery the current state for all changed objects will
1273  * be swaped into @state.
1274  *
1275  * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1276  *
1277  * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1278  *
1279  * 2. Do any other steps that might fail.
1280  *
1281  * 3. Put the staged state into the current state pointers with this function.
1282  *
1283  * 4. Actually commit the hardware state.
1284  *
1285  * 5. Call drm_atomic_helper_cleanup_planes with @state, which since step 3
1286  * contains the old state. Also do any other cleanup required with that state.
1287  */
1288 void drm_atomic_helper_swap_state(struct drm_device *dev,
1289                                   struct drm_atomic_state *state)
1290 {
1291         int i;
1292
1293         for (i = 0; i < dev->mode_config.num_connector; i++) {
1294                 struct drm_connector *connector = state->connectors[i];
1295
1296                 if (!connector)
1297                         continue;
1298
1299                 connector->state->state = state;
1300                 swap(state->connector_states[i], connector->state);
1301                 connector->state->state = NULL;
1302         }
1303
1304         for (i = 0; i < dev->mode_config.num_crtc; i++) {
1305                 struct drm_crtc *crtc = state->crtcs[i];
1306
1307                 if (!crtc)
1308                         continue;
1309
1310                 crtc->state->state = state;
1311                 swap(state->crtc_states[i], crtc->state);
1312                 crtc->state->state = NULL;
1313         }
1314
1315         for (i = 0; i < dev->mode_config.num_total_plane; i++) {
1316                 struct drm_plane *plane = state->planes[i];
1317
1318                 if (!plane)
1319                         continue;
1320
1321                 plane->state->state = state;
1322                 swap(state->plane_states[i], plane->state);
1323                 plane->state->state = NULL;
1324         }
1325 }
1326 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
1327
1328 /**
1329  * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
1330  * @plane: plane object to update
1331  * @crtc: owning CRTC of owning plane
1332  * @fb: framebuffer to flip onto plane
1333  * @crtc_x: x offset of primary plane on crtc
1334  * @crtc_y: y offset of primary plane on crtc
1335  * @crtc_w: width of primary plane rectangle on crtc
1336  * @crtc_h: height of primary plane rectangle on crtc
1337  * @src_x: x offset of @fb for panning
1338  * @src_y: y offset of @fb for panning
1339  * @src_w: width of source rectangle in @fb
1340  * @src_h: height of source rectangle in @fb
1341  *
1342  * Provides a default plane update handler using the atomic driver interface.
1343  *
1344  * RETURNS:
1345  * Zero on success, error code on failure
1346  */
1347 int drm_atomic_helper_update_plane(struct drm_plane *plane,
1348                                    struct drm_crtc *crtc,
1349                                    struct drm_framebuffer *fb,
1350                                    int crtc_x, int crtc_y,
1351                                    unsigned int crtc_w, unsigned int crtc_h,
1352                                    uint32_t src_x, uint32_t src_y,
1353                                    uint32_t src_w, uint32_t src_h)
1354 {
1355         struct drm_atomic_state *state;
1356         struct drm_plane_state *plane_state;
1357         int ret = 0;
1358
1359         state = drm_atomic_state_alloc(plane->dev);
1360         if (!state)
1361                 return -ENOMEM;
1362
1363         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1364 retry:
1365         plane_state = drm_atomic_get_plane_state(state, plane);
1366         if (IS_ERR(plane_state)) {
1367                 ret = PTR_ERR(plane_state);
1368                 goto fail;
1369         }
1370
1371         ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1372         if (ret != 0)
1373                 goto fail;
1374         drm_atomic_set_fb_for_plane(plane_state, fb);
1375         plane_state->crtc_x = crtc_x;
1376         plane_state->crtc_y = crtc_y;
1377         plane_state->crtc_h = crtc_h;
1378         plane_state->crtc_w = crtc_w;
1379         plane_state->src_x = src_x;
1380         plane_state->src_y = src_y;
1381         plane_state->src_h = src_h;
1382         plane_state->src_w = src_w;
1383
1384         ret = drm_atomic_commit(state);
1385         if (ret != 0)
1386                 goto fail;
1387
1388         if (plane == crtc->cursor)
1389                 state->legacy_cursor_update = true;
1390
1391         /* Driver takes ownership of state on successful commit. */
1392         return 0;
1393 fail:
1394         if (ret == -EDEADLK)
1395                 goto backoff;
1396
1397         drm_atomic_state_free(state);
1398
1399         return ret;
1400 backoff:
1401         drm_atomic_state_clear(state);
1402         drm_atomic_legacy_backoff(state);
1403
1404         /*
1405          * Someone might have exchanged the framebuffer while we dropped locks
1406          * in the backoff code. We need to fix up the fb refcount tracking the
1407          * core does for us.
1408          */
1409         plane->old_fb = plane->fb;
1410
1411         goto retry;
1412 }
1413 EXPORT_SYMBOL(drm_atomic_helper_update_plane);
1414
1415 /**
1416  * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
1417  * @plane: plane to disable
1418  *
1419  * Provides a default plane disable handler using the atomic driver interface.
1420  *
1421  * RETURNS:
1422  * Zero on success, error code on failure
1423  */
1424 int drm_atomic_helper_disable_plane(struct drm_plane *plane)
1425 {
1426         struct drm_atomic_state *state;
1427         struct drm_plane_state *plane_state;
1428         int ret = 0;
1429
1430         /*
1431          * FIXME: Without plane->crtc set we can't get at the implicit legacy
1432          * acquire context. The real fix will be to wire the acquire ctx through
1433          * everywhere we need it, but meanwhile prevent chaos by just skipping
1434          * this noop. The critical case is the cursor ioctls which a) only grab
1435          * crtc/cursor-plane locks (so we need the crtc to get at the right
1436          * acquire context) and b) can try to disable the plane multiple times.
1437          */
1438         if (!plane->crtc)
1439                 return 0;
1440
1441         state = drm_atomic_state_alloc(plane->dev);
1442         if (!state)
1443                 return -ENOMEM;
1444
1445         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
1446 retry:
1447         plane_state = drm_atomic_get_plane_state(state, plane);
1448         if (IS_ERR(plane_state)) {
1449                 ret = PTR_ERR(plane_state);
1450                 goto fail;
1451         }
1452
1453         ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1454         if (ret != 0)
1455                 goto fail;
1456         drm_atomic_set_fb_for_plane(plane_state, NULL);
1457         plane_state->crtc_x = 0;
1458         plane_state->crtc_y = 0;
1459         plane_state->crtc_h = 0;
1460         plane_state->crtc_w = 0;
1461         plane_state->src_x = 0;
1462         plane_state->src_y = 0;
1463         plane_state->src_h = 0;
1464         plane_state->src_w = 0;
1465
1466         if (plane == plane->crtc->cursor)
1467                 state->legacy_cursor_update = true;
1468
1469         ret = drm_atomic_commit(state);
1470         if (ret != 0)
1471                 goto fail;
1472
1473         /* Driver takes ownership of state on successful commit. */
1474         return 0;
1475 fail:
1476         if (ret == -EDEADLK)
1477                 goto backoff;
1478
1479         drm_atomic_state_free(state);
1480
1481         return ret;
1482 backoff:
1483         drm_atomic_state_clear(state);
1484         drm_atomic_legacy_backoff(state);
1485
1486         /*
1487          * Someone might have exchanged the framebuffer while we dropped locks
1488          * in the backoff code. We need to fix up the fb refcount tracking the
1489          * core does for us.
1490          */
1491         plane->old_fb = plane->fb;
1492
1493         goto retry;
1494 }
1495 EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
1496
1497 static int update_output_state(struct drm_atomic_state *state,
1498                                struct drm_mode_set *set)
1499 {
1500         struct drm_device *dev = set->crtc->dev;
1501         struct drm_connector_state *conn_state;
1502         int ncrtcs = state->dev->mode_config.num_crtc;
1503         int ret, i, j;
1504
1505         ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1506                                state->acquire_ctx);
1507         if (ret)
1508                 return ret;
1509
1510         /* First grab all affected connector/crtc states. */
1511         for (i = 0; i < set->num_connectors; i++) {
1512                 conn_state = drm_atomic_get_connector_state(state,
1513                                                             set->connectors[i]);
1514                 if (IS_ERR(conn_state))
1515                         return PTR_ERR(conn_state);
1516         }
1517
1518         for (i = 0; i < ncrtcs; i++) {
1519                 struct drm_crtc *crtc = state->crtcs[i];
1520
1521                 if (!crtc)
1522                         continue;
1523
1524                 ret = drm_atomic_add_affected_connectors(state, crtc);
1525                 if (ret)
1526                         return ret;
1527         }
1528
1529         /* Then recompute connector->crtc links and crtc enabling state. */
1530         for (i = 0; i < state->num_connector; i++) {
1531                 struct drm_connector *connector;
1532
1533                 connector = state->connectors[i];
1534                 conn_state = state->connector_states[i];
1535
1536                 if (!connector)
1537                         continue;
1538
1539                 if (conn_state->crtc == set->crtc) {
1540                         ret = drm_atomic_set_crtc_for_connector(conn_state,
1541                                                                 NULL);
1542                         if (ret)
1543                                 return ret;
1544                 }
1545
1546                 for (j = 0; j < set->num_connectors; j++) {
1547                         if (set->connectors[j] == connector) {
1548                                 ret = drm_atomic_set_crtc_for_connector(conn_state,
1549                                                                         set->crtc);
1550                                 if (ret)
1551                                         return ret;
1552                                 break;
1553                         }
1554                 }
1555         }
1556
1557         for (i = 0; i < ncrtcs; i++) {
1558                 struct drm_crtc *crtc = state->crtcs[i];
1559                 struct drm_crtc_state *crtc_state = state->crtc_states[i];
1560
1561                 if (!crtc)
1562                         continue;
1563
1564                 /* Don't update ->enable for the CRTC in the set_config request,
1565                  * since a mismatch would indicate a bug in the upper layers.
1566                  * The actual modeset code later on will catch any
1567                  * inconsistencies here. */
1568                 if (crtc == set->crtc)
1569                         continue;
1570
1571                 crtc_state->enable =
1572                         drm_atomic_connectors_for_crtc(state, crtc);
1573         }
1574
1575         return 0;
1576 }
1577
1578 /**
1579  * drm_atomic_helper_set_config - set a new config from userspace
1580  * @set: mode set configuration
1581  *
1582  * Provides a default crtc set_config handler using the atomic driver interface.
1583  *
1584  * Returns:
1585  * Returns 0 on success, negative errno numbers on failure.
1586  */
1587 int drm_atomic_helper_set_config(struct drm_mode_set *set)
1588 {
1589         struct drm_atomic_state *state;
1590         struct drm_crtc *crtc = set->crtc;
1591         struct drm_crtc_state *crtc_state;
1592         struct drm_plane_state *primary_state;
1593         int ret = 0;
1594
1595         state = drm_atomic_state_alloc(crtc->dev);
1596         if (!state)
1597                 return -ENOMEM;
1598
1599         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1600 retry:
1601         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1602         if (IS_ERR(crtc_state)) {
1603                 ret = PTR_ERR(crtc_state);
1604                 goto fail;
1605         }
1606
1607         primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1608         if (IS_ERR(primary_state)) {
1609                 ret = PTR_ERR(primary_state);
1610                 goto fail;
1611         }
1612
1613         if (!set->mode) {
1614                 WARN_ON(set->fb);
1615                 WARN_ON(set->num_connectors);
1616
1617                 crtc_state->enable = false;
1618                 crtc_state->active = false;
1619
1620                 ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1621                 if (ret != 0)
1622                         goto fail;
1623
1624                 drm_atomic_set_fb_for_plane(primary_state, NULL);
1625
1626                 goto commit;
1627         }
1628
1629         WARN_ON(!set->fb);
1630         WARN_ON(!set->num_connectors);
1631
1632         crtc_state->enable = true;
1633         crtc_state->active = true;
1634         drm_mode_copy(&crtc_state->mode, set->mode);
1635
1636         ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1637         if (ret != 0)
1638                 goto fail;
1639         drm_atomic_set_fb_for_plane(primary_state, set->fb);
1640         primary_state->crtc_x = 0;
1641         primary_state->crtc_y = 0;
1642         primary_state->crtc_h = set->mode->vdisplay;
1643         primary_state->crtc_w = set->mode->hdisplay;
1644         primary_state->src_x = set->x << 16;
1645         primary_state->src_y = set->y << 16;
1646         primary_state->src_h = set->mode->vdisplay << 16;
1647         primary_state->src_w = set->mode->hdisplay << 16;
1648
1649 commit:
1650         ret = update_output_state(state, set);
1651         if (ret)
1652                 goto fail;
1653
1654         ret = drm_atomic_commit(state);
1655         if (ret != 0)
1656                 goto fail;
1657
1658         /* Driver takes ownership of state on successful commit. */
1659         return 0;
1660 fail:
1661         if (ret == -EDEADLK)
1662                 goto backoff;
1663
1664         drm_atomic_state_free(state);
1665
1666         return ret;
1667 backoff:
1668         drm_atomic_state_clear(state);
1669         drm_atomic_legacy_backoff(state);
1670
1671         /*
1672          * Someone might have exchanged the framebuffer while we dropped locks
1673          * in the backoff code. We need to fix up the fb refcount tracking the
1674          * core does for us.
1675          */
1676         crtc->primary->old_fb = crtc->primary->fb;
1677
1678         goto retry;
1679 }
1680 EXPORT_SYMBOL(drm_atomic_helper_set_config);
1681
1682 /**
1683  * drm_atomic_helper_crtc_set_property - helper for crtc prorties
1684  * @crtc: DRM crtc
1685  * @property: DRM property
1686  * @val: value of property
1687  *
1688  * Provides a default plane disablle handler using the atomic driver interface.
1689  *
1690  * RETURNS:
1691  * Zero on success, error code on failure
1692  */
1693 int
1694 drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
1695                                     struct drm_property *property,
1696                                     uint64_t val)
1697 {
1698         struct drm_atomic_state *state;
1699         struct drm_crtc_state *crtc_state;
1700         int ret = 0;
1701
1702         state = drm_atomic_state_alloc(crtc->dev);
1703         if (!state)
1704                 return -ENOMEM;
1705
1706         /* ->set_property is always called with all locks held. */
1707         state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
1708 retry:
1709         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1710         if (IS_ERR(crtc_state)) {
1711                 ret = PTR_ERR(crtc_state);
1712                 goto fail;
1713         }
1714
1715         ret = drm_atomic_crtc_set_property(crtc, crtc_state,
1716                         property, val);
1717         if (ret)
1718                 goto fail;
1719
1720         ret = drm_atomic_commit(state);
1721         if (ret != 0)
1722                 goto fail;
1723
1724         /* Driver takes ownership of state on successful commit. */
1725         return 0;
1726 fail:
1727         if (ret == -EDEADLK)
1728                 goto backoff;
1729
1730         drm_atomic_state_free(state);
1731
1732         return ret;
1733 backoff:
1734         drm_atomic_state_clear(state);
1735         drm_atomic_legacy_backoff(state);
1736
1737         goto retry;
1738 }
1739 EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
1740
1741 /**
1742  * drm_atomic_helper_plane_set_property - helper for plane prorties
1743  * @plane: DRM plane
1744  * @property: DRM property
1745  * @val: value of property
1746  *
1747  * Provides a default plane disable handler using the atomic driver interface.
1748  *
1749  * RETURNS:
1750  * Zero on success, error code on failure
1751  */
1752 int
1753 drm_atomic_helper_plane_set_property(struct drm_plane *plane,
1754                                     struct drm_property *property,
1755                                     uint64_t val)
1756 {
1757         struct drm_atomic_state *state;
1758         struct drm_plane_state *plane_state;
1759         int ret = 0;
1760
1761         state = drm_atomic_state_alloc(plane->dev);
1762         if (!state)
1763                 return -ENOMEM;
1764
1765         /* ->set_property is always called with all locks held. */
1766         state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
1767 retry:
1768         plane_state = drm_atomic_get_plane_state(state, plane);
1769         if (IS_ERR(plane_state)) {
1770                 ret = PTR_ERR(plane_state);
1771                 goto fail;
1772         }
1773
1774         ret = drm_atomic_plane_set_property(plane, plane_state,
1775                         property, val);
1776         if (ret)
1777                 goto fail;
1778
1779         ret = drm_atomic_commit(state);
1780         if (ret != 0)
1781                 goto fail;
1782
1783         /* Driver takes ownership of state on successful commit. */
1784         return 0;
1785 fail:
1786         if (ret == -EDEADLK)
1787                 goto backoff;
1788
1789         drm_atomic_state_free(state);
1790
1791         return ret;
1792 backoff:
1793         drm_atomic_state_clear(state);
1794         drm_atomic_legacy_backoff(state);
1795
1796         goto retry;
1797 }
1798 EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
1799
1800 /**
1801  * drm_atomic_helper_connector_set_property - helper for connector prorties
1802  * @connector: DRM connector
1803  * @property: DRM property
1804  * @val: value of property
1805  *
1806  * Provides a default plane disablle handler using the atomic driver interface.
1807  *
1808  * RETURNS:
1809  * Zero on success, error code on failure
1810  */
1811 int
1812 drm_atomic_helper_connector_set_property(struct drm_connector *connector,
1813                                     struct drm_property *property,
1814                                     uint64_t val)
1815 {
1816         struct drm_atomic_state *state;
1817         struct drm_connector_state *connector_state;
1818         int ret = 0;
1819
1820         state = drm_atomic_state_alloc(connector->dev);
1821         if (!state)
1822                 return -ENOMEM;
1823
1824         /* ->set_property is always called with all locks held. */
1825         state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
1826 retry:
1827         connector_state = drm_atomic_get_connector_state(state, connector);
1828         if (IS_ERR(connector_state)) {
1829                 ret = PTR_ERR(connector_state);
1830                 goto fail;
1831         }
1832
1833         ret = drm_atomic_connector_set_property(connector, connector_state,
1834                         property, val);
1835         if (ret)
1836                 goto fail;
1837
1838         ret = drm_atomic_commit(state);
1839         if (ret != 0)
1840                 goto fail;
1841
1842         /* Driver takes ownership of state on successful commit. */
1843         return 0;
1844 fail:
1845         if (ret == -EDEADLK)
1846                 goto backoff;
1847
1848         drm_atomic_state_free(state);
1849
1850         return ret;
1851 backoff:
1852         drm_atomic_state_clear(state);
1853         drm_atomic_legacy_backoff(state);
1854
1855         goto retry;
1856 }
1857 EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
1858
1859 /**
1860  * drm_atomic_helper_page_flip - execute a legacy page flip
1861  * @crtc: DRM crtc
1862  * @fb: DRM framebuffer
1863  * @event: optional DRM event to signal upon completion
1864  * @flags: flip flags for non-vblank sync'ed updates
1865  *
1866  * Provides a default page flip implementation using the atomic driver interface.
1867  *
1868  * Note that for now so called async page flips (i.e. updates which are not
1869  * synchronized to vblank) are not supported, since the atomic interfaces have
1870  * no provisions for this yet.
1871  *
1872  * Returns:
1873  * Returns 0 on success, negative errno numbers on failure.
1874  */
1875 int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
1876                                 struct drm_framebuffer *fb,
1877                                 struct drm_pending_vblank_event *event,
1878                                 uint32_t flags)
1879 {
1880         struct drm_plane *plane = crtc->primary;
1881         struct drm_atomic_state *state;
1882         struct drm_plane_state *plane_state;
1883         struct drm_crtc_state *crtc_state;
1884         int ret = 0;
1885
1886         if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
1887                 return -EINVAL;
1888
1889         state = drm_atomic_state_alloc(plane->dev);
1890         if (!state)
1891                 return -ENOMEM;
1892
1893         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1894 retry:
1895         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1896         if (IS_ERR(crtc_state)) {
1897                 ret = PTR_ERR(crtc_state);
1898                 goto fail;
1899         }
1900         crtc_state->event = event;
1901
1902         plane_state = drm_atomic_get_plane_state(state, plane);
1903         if (IS_ERR(plane_state)) {
1904                 ret = PTR_ERR(plane_state);
1905                 goto fail;
1906         }
1907
1908         ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1909         if (ret != 0)
1910                 goto fail;
1911         drm_atomic_set_fb_for_plane(plane_state, fb);
1912
1913         ret = drm_atomic_async_commit(state);
1914         if (ret != 0)
1915                 goto fail;
1916
1917         /* TODO: ->page_flip is the only driver callback where the core
1918          * doesn't update plane->fb. For now patch it up here. */
1919         plane->fb = plane->state->fb;
1920
1921         /* Driver takes ownership of state on successful async commit. */
1922         return 0;
1923 fail:
1924         if (ret == -EDEADLK)
1925                 goto backoff;
1926
1927         drm_atomic_state_free(state);
1928
1929         return ret;
1930 backoff:
1931         drm_atomic_state_clear(state);
1932         drm_atomic_legacy_backoff(state);
1933
1934         /*
1935          * Someone might have exchanged the framebuffer while we dropped locks
1936          * in the backoff code. We need to fix up the fb refcount tracking the
1937          * core does for us.
1938          */
1939         plane->old_fb = plane->fb;
1940
1941         goto retry;
1942 }
1943 EXPORT_SYMBOL(drm_atomic_helper_page_flip);
1944
1945 /**
1946  * drm_atomic_helper_connector_dpms() - connector dpms helper implementation
1947  * @connector: affected connector
1948  * @mode: DPMS mode
1949  *
1950  * This is the main helper function provided by the atomic helper framework for
1951  * implementing the legacy DPMS connector interface. It computes the new desired
1952  * ->active state for the corresponding CRTC (if the connector is enabled) and
1953  *  updates it.
1954  */
1955 void drm_atomic_helper_connector_dpms(struct drm_connector *connector,
1956                                       int mode)
1957 {
1958         struct drm_mode_config *config = &connector->dev->mode_config;
1959         struct drm_atomic_state *state;
1960         struct drm_crtc_state *crtc_state;
1961         struct drm_crtc *crtc;
1962         struct drm_connector *tmp_connector;
1963         int ret;
1964         bool active = false;
1965
1966         if (mode != DRM_MODE_DPMS_ON)
1967                 mode = DRM_MODE_DPMS_OFF;
1968
1969         connector->dpms = mode;
1970         crtc = connector->state->crtc;
1971
1972         if (!crtc)
1973                 return;
1974
1975         /* FIXME: ->dpms has no return value so can't forward the -ENOMEM. */
1976         state = drm_atomic_state_alloc(connector->dev);
1977         if (!state)
1978                 return;
1979
1980         state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1981 retry:
1982         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1983         if (IS_ERR(crtc_state))
1984                 return;
1985
1986         WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
1987
1988         list_for_each_entry(tmp_connector, &config->connector_list, head) {
1989                 if (connector->state->crtc != crtc)
1990                         continue;
1991
1992                 if (connector->dpms == DRM_MODE_DPMS_ON) {
1993                         active = true;
1994                         break;
1995                 }
1996         }
1997         crtc_state->active = active;
1998
1999         ret = drm_atomic_commit(state);
2000         if (ret != 0)
2001                 goto fail;
2002
2003         /* Driver takes ownership of state on successful async commit. */
2004         return;
2005 fail:
2006         if (ret == -EDEADLK)
2007                 goto backoff;
2008
2009         drm_atomic_state_free(state);
2010
2011         WARN(1, "Driver bug: Changing ->active failed with ret=%i\n", ret);
2012
2013         return;
2014 backoff:
2015         drm_atomic_state_clear(state);
2016         drm_atomic_legacy_backoff(state);
2017
2018         goto retry;
2019 }
2020 EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
2021
2022 /**
2023  * DOC: atomic state reset and initialization
2024  *
2025  * Both the drm core and the atomic helpers assume that there is always the full
2026  * and correct atomic software state for all connectors, CRTCs and planes
2027  * available. Which is a bit a problem on driver load and also after system
2028  * suspend. One way to solve this is to have a hardware state read-out
2029  * infrastructure which reconstructs the full software state (e.g. the i915
2030  * driver).
2031  *
2032  * The simpler solution is to just reset the software state to everything off,
2033  * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
2034  * the atomic helpers provide default reset implementations for all hooks.
2035  */
2036
2037 /**
2038  * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
2039  * @crtc: drm CRTC
2040  *
2041  * Resets the atomic state for @crtc by freeing the state pointer (which might
2042  * be NULL, e.g. at driver load time) and allocating a new empty state object.
2043  */
2044 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
2045 {
2046         kfree(crtc->state);
2047         crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
2048
2049         if (crtc->state)
2050                 crtc->state->crtc = crtc;
2051 }
2052 EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
2053
2054 /**
2055  * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
2056  * @crtc: drm CRTC
2057  *
2058  * Default CRTC state duplicate hook for drivers which don't have their own
2059  * subclassed CRTC state structure.
2060  */
2061 struct drm_crtc_state *
2062 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
2063 {
2064         struct drm_crtc_state *state;
2065
2066         if (WARN_ON(!crtc->state))
2067                 return NULL;
2068
2069         state = kmemdup(crtc->state, sizeof(*crtc->state), GFP_KERNEL);
2070
2071         if (state) {
2072                 state->mode_changed = false;
2073                 state->active_changed = false;
2074                 state->planes_changed = false;
2075                 state->event = NULL;
2076         }
2077
2078         return state;
2079 }
2080 EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
2081
2082 /**
2083  * drm_atomic_helper_crtc_destroy_state - default state destroy hook
2084  * @crtc: drm CRTC
2085  * @state: CRTC state object to release
2086  *
2087  * Default CRTC state destroy hook for drivers which don't have their own
2088  * subclassed CRTC state structure.
2089  */
2090 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
2091                                           struct drm_crtc_state *state)
2092 {
2093         kfree(state);
2094 }
2095 EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
2096
2097 /**
2098  * drm_atomic_helper_plane_reset - default ->reset hook for planes
2099  * @plane: drm plane
2100  *
2101  * Resets the atomic state for @plane by freeing the state pointer (which might
2102  * be NULL, e.g. at driver load time) and allocating a new empty state object.
2103  */
2104 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
2105 {
2106         if (plane->state && plane->state->fb)
2107                 drm_framebuffer_unreference(plane->state->fb);
2108
2109         kfree(plane->state);
2110         plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
2111
2112         if (plane->state)
2113                 plane->state->plane = plane;
2114 }
2115 EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
2116
2117 /**
2118  * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
2119  * @plane: drm plane
2120  *
2121  * Default plane state duplicate hook for drivers which don't have their own
2122  * subclassed plane state structure.
2123  */
2124 struct drm_plane_state *
2125 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
2126 {
2127         struct drm_plane_state *state;
2128
2129         if (WARN_ON(!plane->state))
2130                 return NULL;
2131
2132         state = kmemdup(plane->state, sizeof(*plane->state), GFP_KERNEL);
2133
2134         if (state && state->fb)
2135                 drm_framebuffer_reference(state->fb);
2136
2137         return state;
2138 }
2139 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
2140
2141 /**
2142  * drm_atomic_helper_plane_destroy_state - default state destroy hook
2143  * @plane: drm plane
2144  * @state: plane state object to release
2145  *
2146  * Default plane state destroy hook for drivers which don't have their own
2147  * subclassed plane state structure.
2148  */
2149 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
2150                                            struct drm_plane_state *state)
2151 {
2152         if (state->fb)
2153                 drm_framebuffer_unreference(state->fb);
2154
2155         kfree(state);
2156 }
2157 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
2158
2159 /**
2160  * drm_atomic_helper_connector_reset - default ->reset hook for connectors
2161  * @connector: drm connector
2162  *
2163  * Resets the atomic state for @connector by freeing the state pointer (which
2164  * might be NULL, e.g. at driver load time) and allocating a new empty state
2165  * object.
2166  */
2167 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
2168 {
2169         kfree(connector->state);
2170         connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
2171
2172         if (connector->state)
2173                 connector->state->connector = connector;
2174 }
2175 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
2176
2177 /**
2178  * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
2179  * @connector: drm connector
2180  *
2181  * Default connector state duplicate hook for drivers which don't have their own
2182  * subclassed connector state structure.
2183  */
2184 struct drm_connector_state *
2185 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
2186 {
2187         if (WARN_ON(!connector->state))
2188                 return NULL;
2189
2190         return kmemdup(connector->state, sizeof(*connector->state), GFP_KERNEL);
2191 }
2192 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
2193
2194 /**
2195  * drm_atomic_helper_connector_destroy_state - default state destroy hook
2196  * @connector: drm connector
2197  * @state: connector state object to release
2198  *
2199  * Default connector state destroy hook for drivers which don't have their own
2200  * subclassed connector state structure.
2201  */
2202 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
2203                                           struct drm_connector_state *state)
2204 {
2205         kfree(state);
2206 }
2207 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);