drivers/gpu/drm/drm_atomic_state_helper.c

   1 /*
   2  * Copyright (C) 2018 Intel Corp.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors:
  23  * Rob Clark <robdclark@gmail.com>
  24  * Daniel Vetter <daniel.vetter@ffwll.ch>
  25  */
  26
  27 #include <drm/drm_atomic.h>
  28 #include <drm/drm_atomic_state_helper.h>
  29 #include <drm/drm_blend.h>
  30 #include <drm/drm_bridge.h>
  31 #include <drm/drm_connector.h>
  32 #include <drm/drm_crtc.h>
  33 #include <drm/drm_device.h>
  34 #include <drm/drm_framebuffer.h>
  35 #include <drm/drm_plane.h>
  36 #include <drm/drm_print.h>
  37 #include <drm/drm_vblank.h>
  38 #include <drm/drm_writeback.h>
  39
  40 #include <linux/slab.h>
  41 #include <linux/dma-fence.h>
  42
  43 /**
  44  * DOC: atomic state reset and initialization
  45  *
  46  * Both the drm core and the atomic helpers assume that there is always the full
  47  * and correct atomic software state for all connectors, CRTCs and planes
  48  * available. Which is a bit a problem on driver load and also after system
  49  * suspend. One way to solve this is to have a hardware state read-out
  50  * infrastructure which reconstructs the full software state (e.g. the i915
  51  * driver).
  52  *
  53  * The simpler solution is to just reset the software state to everything off,
  54  * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
  55  * the atomic helpers provide default reset implementations for all hooks.
  56  *
  57  * On the upside the precise state tracking of atomic simplifies system suspend
  58  * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe
  59  * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume().
  60  * For other drivers the building blocks are split out, see the documentation
  61  * for these functions.
  62  */
  63
  64 /**
  65  * __drm_atomic_helper_crtc_state_reset - reset the CRTC state
  66  * @crtc_state: atomic CRTC state, must not be NULL
  67  * @crtc: CRTC object, must not be NULL
  68  *
  69  * Initializes the newly allocated @crtc_state with default
  70  * values. This is useful for drivers that subclass the CRTC state.
  71  */
  72 void
  73 __drm_atomic_helper_crtc_state_reset(struct drm_crtc_state *crtc_state,
  74                                      struct drm_crtc *crtc)
  75 {
  76         crtc_state->crtc = crtc;
  77 }
  78 EXPORT_SYMBOL(__drm_atomic_helper_crtc_state_reset);
  79
  80 /**
  81  * __drm_atomic_helper_crtc_reset - reset state on CRTC
  82  * @crtc: drm CRTC
  83  * @crtc_state: CRTC state to assign
  84  *
  85  * Initializes the newly allocated @crtc_state and assigns it to
  86  * the &drm_crtc->state pointer of @crtc, usually required when
  87  * initializing the drivers or when called from the &drm_crtc_funcs.reset
  88  * hook.
  89  *
  90  * This is useful for drivers that subclass the CRTC state.
  91  */
  92 void
  93 __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
  94                                struct drm_crtc_state *crtc_state)
  95 {
  96         if (crtc_state)
  97                 __drm_atomic_helper_crtc_state_reset(crtc_state, crtc);
  98
  99         if (drm_dev_has_vblank(crtc->dev))
 100                 drm_crtc_vblank_reset(crtc);
 101
 102         crtc->state = crtc_state;
 103 }
 104 EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);
 105
 106 /**
 107  * drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.reset hook for CRTCs
 108  * @crtc: drm CRTC
 109  *
 110  * Resets the atomic state for @crtc by freeing the state pointer (which might
 111  * be NULL, e.g. at driver load time) and allocating a new empty state object.
 112  */
 113 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
 114 {
 115         struct drm_crtc_state *crtc_state =
 116                 kzalloc(sizeof(*crtc->state), GFP_KERNEL);
 117
 118         if (crtc->state)
 119                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 120
 121         __drm_atomic_helper_crtc_reset(crtc, crtc_state);
 122 }
 123 EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
 124
 125 /**
 126  * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state
 127  * @crtc: CRTC object
 128  * @state: atomic CRTC state
 129  *
 130  * Copies atomic state from a CRTC's current state and resets inferred values.
 131  * This is useful for drivers that subclass the CRTC state.
 132  */
 133 void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
 134                                               struct drm_crtc_state *state)
 135 {
 136         memcpy(state, crtc->state, sizeof(*state));
 137
 138         if (state->mode_blob)
 139                 drm_property_blob_get(state->mode_blob);
 140         if (state->degamma_lut)
 141                 drm_property_blob_get(state->degamma_lut);
 142         if (state->ctm)
 143                 drm_property_blob_get(state->ctm);
 144         if (state->gamma_lut)
 145                 drm_property_blob_get(state->gamma_lut);
 146         state->mode_changed = false;
 147         state->active_changed = false;
 148         state->planes_changed = false;
 149         state->connectors_changed = false;
 150         state->color_mgmt_changed = false;
 151         state->zpos_changed = false;
 152         state->commit = NULL;
 153         state->event = NULL;
 154         state->async_flip = false;
 155
 156         /* Self refresh should be canceled when a new update is available */
 157         state->active = drm_atomic_crtc_effectively_active(state);
 158         state->self_refresh_active = false;
 159 }
 160 EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
 161
 162 /**
 163  * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
 164  * @crtc: drm CRTC
 165  *
 166  * Default CRTC state duplicate hook for drivers which don't have their own
 167  * subclassed CRTC state structure.
 168  */
 169 struct drm_crtc_state *
 170 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
 171 {
 172         struct drm_crtc_state *state;
 173
 174         if (WARN_ON(!crtc->state))
 175                 return NULL;
 176
 177         state = kmalloc(sizeof(*state), GFP_KERNEL);
 178         if (state)
 179                 __drm_atomic_helper_crtc_duplicate_state(crtc, state);
 180
 181         return state;
 182 }
 183 EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
 184
 185 /**
 186  * __drm_atomic_helper_crtc_destroy_state - release CRTC state
 187  * @state: CRTC state object to release
 188  *
 189  * Releases all resources stored in the CRTC state without actually freeing
 190  * the memory of the CRTC state. This is useful for drivers that subclass the
 191  * CRTC state.
 192  */
 193 void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state)
 194 {
 195         if (state->commit) {
 196                 /*
 197                  * In the event that a non-blocking commit returns
 198                  * -ERESTARTSYS before the commit_tail work is queued, we will
 199                  * have an extra reference to the commit object. Release it, if
 200                  * the event has not been consumed by the worker.
 201                  *
 202                  * state->event may be freed, so we can't directly look at
 203                  * state->event->base.completion.
 204                  */
 205                 if (state->event && state->commit->abort_completion)
 206                         drm_crtc_commit_put(state->commit);
 207
 208                 kfree(state->commit->event);
 209                 state->commit->event = NULL;
 210
 211                 drm_crtc_commit_put(state->commit);
 212         }
 213
 214         drm_property_blob_put(state->mode_blob);
 215         drm_property_blob_put(state->degamma_lut);
 216         drm_property_blob_put(state->ctm);
 217         drm_property_blob_put(state->gamma_lut);
 218 }
 219 EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
 220
 221 /**
 222  * drm_atomic_helper_crtc_destroy_state - default state destroy hook
 223  * @crtc: drm CRTC
 224  * @state: CRTC state object to release
 225  *
 226  * Default CRTC state destroy hook for drivers which don't have their own
 227  * subclassed CRTC state structure.
 228  */
 229 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
 230                                           struct drm_crtc_state *state)
 231 {
 232         __drm_atomic_helper_crtc_destroy_state(state);
 233         kfree(state);
 234 }
 235 EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
 236
 237 /**
 238  * __drm_atomic_helper_plane_state_reset - resets plane state to default values
 239  * @plane_state: atomic plane state, must not be NULL
 240  * @plane: plane object, must not be NULL
 241  *
 242  * Initializes the newly allocated @plane_state with default
 243  * values. This is useful for drivers that subclass the CRTC state.
 244  */
 245 void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
 246                                            struct drm_plane *plane)
 247 {
 248         u64 val;
 249
 250         plane_state->plane = plane;
 251         plane_state->rotation = DRM_MODE_ROTATE_0;
 252
 253         plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE;
 254         plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
 255
 256         if (plane->color_encoding_property) {
 257                 if (!drm_object_property_get_default_value(&plane->base,
 258                                                            plane->color_encoding_property,
 259                                                            &val))
 260                         plane_state->color_encoding = val;
 261         }
 262
 263         if (plane->color_range_property) {
 264                 if (!drm_object_property_get_default_value(&plane->base,
 265                                                            plane->color_range_property,
 266                                                            &val))
 267                         plane_state->color_range = val;
 268         }
 269
 270         if (plane->chroma_siting_h_property) {
 271                 if (!drm_object_property_get_default_value(&plane->base,
 272                                                            plane->chroma_siting_h_property,
 273                                                            &val))
 274                         plane_state->chroma_siting_h = val;
 275         }
 276
 277         if (plane->chroma_siting_v_property) {
 278                 if (!drm_object_property_get_default_value(&plane->base,
 279                                                            plane->chroma_siting_v_property,
 280                                                            &val))
 281                         plane_state->chroma_siting_v = val;
 282         }
 283
 284         if (plane->zpos_property) {
 285                 if (!drm_object_property_get_default_value(&plane->base,
 286                                                            plane->zpos_property,
 287                                                            &val)) {
 288                         plane_state->zpos = val;
 289                         plane_state->normalized_zpos = val;
 290                 }
 291         }
 292 }
 293 EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset);
 294
 295 /**
 296  * __drm_atomic_helper_plane_reset - reset state on plane
 297  * @plane: drm plane
 298  * @plane_state: plane state to assign
 299  *
 300  * Initializes the newly allocated @plane_state and assigns it to
 301  * the &drm_crtc->state pointer of @plane, usually required when
 302  * initializing the drivers or when called from the &drm_plane_funcs.reset
 303  * hook.
 304  *
 305  * This is useful for drivers that subclass the plane state.
 306  */
 307 void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
 308                                      struct drm_plane_state *plane_state)
 309 {
 310         if (plane_state)
 311                 __drm_atomic_helper_plane_state_reset(plane_state, plane);
 312
 313         plane->state = plane_state;
 314 }
 315 EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);
 316
 317 /**
 318  * drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes
 319  * @plane: drm plane
 320  *
 321  * Resets the atomic state for @plane by freeing the state pointer (which might
 322  * be NULL, e.g. at driver load time) and allocating a new empty state object.
 323  */
 324 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
 325 {
 326         if (plane->state)
 327                 __drm_atomic_helper_plane_destroy_state(plane->state);
 328
 329         kfree(plane->state);
 330         plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
 331         if (plane->state)
 332                 __drm_atomic_helper_plane_reset(plane, plane->state);
 333 }
 334 EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
 335
 336 /**
 337  * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
 338  * @plane: plane object
 339  * @state: atomic plane state
 340  *
 341  * Copies atomic state from a plane's current state. This is useful for
 342  * drivers that subclass the plane state.
 343  */
 344 void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
 345                                                struct drm_plane_state *state)
 346 {
 347         memcpy(state, plane->state, sizeof(*state));
 348
 349         if (state->fb)
 350                 drm_framebuffer_get(state->fb);
 351
 352         state->fence = NULL;
 353         state->commit = NULL;
 354         state->fb_damage_clips = NULL;
 355 }
 356 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
 357
 358 /**
 359  * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
 360  * @plane: drm plane
 361  *
 362  * Default plane state duplicate hook for drivers which don't have their own
 363  * subclassed plane state structure.
 364  */
 365 struct drm_plane_state *
 366 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
 367 {
 368         struct drm_plane_state *state;
 369
 370         if (WARN_ON(!plane->state))
 371                 return NULL;
 372
 373         state = kmalloc(sizeof(*state), GFP_KERNEL);
 374         if (state)
 375                 __drm_atomic_helper_plane_duplicate_state(plane, state);
 376
 377         return state;
 378 }
 379 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
 380
 381 /**
 382  * __drm_atomic_helper_plane_destroy_state - release plane state
 383  * @state: plane state object to release
 384  *
 385  * Releases all resources stored in the plane state without actually freeing
 386  * the memory of the plane state. This is useful for drivers that subclass the
 387  * plane state.
 388  */
 389 void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 390 {
 391         if (state->fb)
 392                 drm_framebuffer_put(state->fb);
 393
 394         if (state->fence)
 395                 dma_fence_put(state->fence);
 396
 397         if (state->commit)
 398                 drm_crtc_commit_put(state->commit);
 399
 400         drm_property_blob_put(state->fb_damage_clips);
 401 }
 402 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 403
 404 /**
 405  * drm_atomic_helper_plane_destroy_state - default state destroy hook
 406  * @plane: drm plane
 407  * @state: plane state object to release
 408  *
 409  * Default plane state destroy hook for drivers which don't have their own
 410  * subclassed plane state structure.
 411  */
 412 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
 413                                            struct drm_plane_state *state)
 414 {
 415         __drm_atomic_helper_plane_destroy_state(state);
 416         kfree(state);
 417 }
 418 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
 419
 420 /**
 421  * __drm_atomic_helper_connector_state_reset - reset the connector state
 422  * @conn_state: atomic connector state, must not be NULL
 423  * @connector: connectotr object, must not be NULL
 424  *
 425  * Initializes the newly allocated @conn_state with default
 426  * values. This is useful for drivers that subclass the connector state.
 427  */
 428 void
 429 __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,
 430                                           struct drm_connector *connector)
 431 {
 432         conn_state->connector = connector;
 433 }
 434 EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset);
 435
 436 /**
 437  * __drm_atomic_helper_connector_reset - reset state on connector
 438  * @connector: drm connector
 439  * @conn_state: connector state to assign
 440  *
 441  * Initializes the newly allocated @conn_state and assigns it to
 442  * the &drm_connector->state pointer of @connector, usually required when
 443  * initializing the drivers or when called from the &drm_connector_funcs.reset
 444  * hook.
 445  *
 446  * This is useful for drivers that subclass the connector state.
 447  */
 448 void
 449 __drm_atomic_helper_connector_reset(struct drm_connector *connector,
 450                                     struct drm_connector_state *conn_state)
 451 {
 452         if (conn_state)
 453                 __drm_atomic_helper_connector_state_reset(conn_state, connector);
 454
 455         connector->state = conn_state;
 456 }
 457 EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
 458
 459 /**
 460  * drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors
 461  * @connector: drm connector
 462  *
 463  * Resets the atomic state for @connector by freeing the state pointer (which
 464  * might be NULL, e.g. at driver load time) and allocating a new empty state
 465  * object.
 466  */
 467 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
 468 {
 469         struct drm_connector_state *conn_state =
 470                 kzalloc(sizeof(*conn_state), GFP_KERNEL);
 471
 472         if (connector->state)
 473                 __drm_atomic_helper_connector_destroy_state(connector->state);
 474
 475         kfree(connector->state);
 476         __drm_atomic_helper_connector_reset(connector, conn_state);
 477 }
 478 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
 479
 480 /**
 481  * drm_atomic_helper_connector_tv_margins_reset - Resets TV connector properties
 482  * @connector: DRM connector
 483  *
 484  * Resets the TV-related properties attached to a connector.
 485  */
 486 void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector)
 487 {
 488         struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
 489         struct drm_connector_state *state = connector->state;
 490
 491         state->tv.margins.left = cmdline->tv_margins.left;
 492         state->tv.margins.right = cmdline->tv_margins.right;
 493         state->tv.margins.top = cmdline->tv_margins.top;
 494         state->tv.margins.bottom = cmdline->tv_margins.bottom;
 495 }
 496 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_margins_reset);
 497
 498 /**
 499  * drm_atomic_helper_connector_tv_reset - Resets Analog TV connector properties
 500  * @connector: DRM connector
 501  *
 502  * Resets the analog TV properties attached to a connector
 503  */
 504 void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
 505 {
 506         struct drm_device *dev = connector->dev;
 507         struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
 508         struct drm_connector_state *state = connector->state;
 509         struct drm_property *prop;
 510         uint64_t val;
 511
 512         prop = dev->mode_config.tv_mode_property;
 513         if (prop)
 514                 if (!drm_object_property_get_default_value(&connector->base,
 515                                                            prop, &val))
 516                         state->tv.mode = val;
 517
 518         if (cmdline->tv_mode_specified)
 519                 state->tv.mode = cmdline->tv_mode;
 520
 521         prop = dev->mode_config.tv_select_subconnector_property;
 522         if (prop)
 523                 if (!drm_object_property_get_default_value(&connector->base,
 524                                                            prop, &val))
 525                         state->tv.select_subconnector = val;
 526
 527         prop = dev->mode_config.tv_subconnector_property;
 528         if (prop)
 529                 if (!drm_object_property_get_default_value(&connector->base,
 530                                                            prop, &val))
 531                         state->tv.subconnector = val;
 532
 533         prop = dev->mode_config.tv_brightness_property;
 534         if (prop)
 535                 if (!drm_object_property_get_default_value(&connector->base,
 536                                                            prop, &val))
 537                         state->tv.brightness = val;
 538
 539         prop = dev->mode_config.tv_contrast_property;
 540         if (prop)
 541                 if (!drm_object_property_get_default_value(&connector->base,
 542                                                            prop, &val))
 543                         state->tv.contrast = val;
 544
 545         prop = dev->mode_config.tv_flicker_reduction_property;
 546         if (prop)
 547                 if (!drm_object_property_get_default_value(&connector->base,
 548                                                            prop, &val))
 549                         state->tv.flicker_reduction = val;
 550
 551         prop = dev->mode_config.tv_overscan_property;
 552         if (prop)
 553                 if (!drm_object_property_get_default_value(&connector->base,
 554                                                            prop, &val))
 555                         state->tv.overscan = val;
 556
 557         prop = dev->mode_config.tv_saturation_property;
 558         if (prop)
 559                 if (!drm_object_property_get_default_value(&connector->base,
 560                                                            prop, &val))
 561                         state->tv.saturation = val;
 562
 563         prop = dev->mode_config.tv_hue_property;
 564         if (prop)
 565                 if (!drm_object_property_get_default_value(&connector->base,
 566                                                            prop, &val))
 567                         state->tv.hue = val;
 568
 569         drm_atomic_helper_connector_tv_margins_reset(connector);
 570 }
 571 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
 572
 573 /**
 574  * drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
 575  * @connector: DRM Connector
 576  * @state: the DRM State object
 577  *
 578  * Checks the state object to see if the requested state is valid for an
 579  * analog TV connector.
 580  *
 581  * Return:
 582  * %0 for success, a negative error code on error.
 583  */
 584 int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 585                                          struct drm_atomic_state *state)
 586 {
 587         struct drm_connector_state *old_conn_state =
 588                 drm_atomic_get_old_connector_state(state, connector);
 589         struct drm_connector_state *new_conn_state =
 590                 drm_atomic_get_new_connector_state(state, connector);
 591         struct drm_crtc_state *crtc_state;
 592         struct drm_crtc *crtc;
 593
 594         crtc = new_conn_state->crtc;
 595         if (!crtc)
 596                 return 0;
 597
 598         crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 599         if (!crtc_state)
 600                 return -EINVAL;
 601
 602         if (old_conn_state->tv.mode != new_conn_state->tv.mode)
 603                 crtc_state->mode_changed = true;
 604
 605         if (old_conn_state->tv.margins.left != new_conn_state->tv.margins.left ||
 606             old_conn_state->tv.margins.right != new_conn_state->tv.margins.right ||
 607             old_conn_state->tv.margins.top != new_conn_state->tv.margins.top ||
 608             old_conn_state->tv.margins.bottom != new_conn_state->tv.margins.bottom ||
 609             old_conn_state->tv.mode != new_conn_state->tv.mode ||
 610             old_conn_state->tv.brightness != new_conn_state->tv.brightness ||
 611             old_conn_state->tv.contrast != new_conn_state->tv.contrast ||
 612             old_conn_state->tv.flicker_reduction != new_conn_state->tv.flicker_reduction ||
 613             old_conn_state->tv.overscan != new_conn_state->tv.overscan ||
 614             old_conn_state->tv.saturation != new_conn_state->tv.saturation ||
 615             old_conn_state->tv.hue != new_conn_state->tv.hue)
 616                 crtc_state->connectors_changed = true;
 617
 618         return 0;
 619 }
 620 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
 621
 622 /**
 623  * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
 624  * @connector: connector object
 625  * @state: atomic connector state
 626  *
 627  * Copies atomic state from a connector's current state. This is useful for
 628  * drivers that subclass the connector state.
 629  */
 630 void
 631 __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
 632                                             struct drm_connector_state *state)
 633 {
 634         memcpy(state, connector->state, sizeof(*state));
 635         if (state->crtc)
 636                 drm_connector_get(connector);
 637         state->commit = NULL;
 638
 639         if (state->hdr_output_metadata)
 640                 drm_property_blob_get(state->hdr_output_metadata);
 641
 642         /* Don't copy over a writeback job, they are used only once */
 643         state->writeback_job = NULL;
 644 }
 645 EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
 646
 647 /**
 648  * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
 649  * @connector: drm connector
 650  *
 651  * Default connector state duplicate hook for drivers which don't have their own
 652  * subclassed connector state structure.
 653  */
 654 struct drm_connector_state *
 655 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
 656 {
 657         struct drm_connector_state *state;
 658
 659         if (WARN_ON(!connector->state))
 660                 return NULL;
 661
 662         state = kmalloc(sizeof(*state), GFP_KERNEL);
 663         if (state)
 664                 __drm_atomic_helper_connector_duplicate_state(connector, state);
 665
 666         return state;
 667 }
 668 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
 669
 670 /**
 671  * __drm_atomic_helper_connector_destroy_state - release connector state
 672  * @state: connector state object to release
 673  *
 674  * Releases all resources stored in the connector state without actually
 675  * freeing the memory of the connector state. This is useful for drivers that
 676  * subclass the connector state.
 677  */
 678 void
 679 __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
 680 {
 681         if (state->crtc)
 682                 drm_connector_put(state->connector);
 683
 684         if (state->commit)
 685                 drm_crtc_commit_put(state->commit);
 686
 687         if (state->writeback_job)
 688                 drm_writeback_cleanup_job(state->writeback_job);
 689
 690         drm_property_blob_put(state->hdr_output_metadata);
 691 }
 692 EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
 693
 694 /**
 695  * drm_atomic_helper_connector_destroy_state - default state destroy hook
 696  * @connector: drm connector
 697  * @state: connector state object to release
 698  *
 699  * Default connector state destroy hook for drivers which don't have their own
 700  * subclassed connector state structure.
 701  */
 702 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
 703                                           struct drm_connector_state *state)
 704 {
 705         __drm_atomic_helper_connector_destroy_state(state);
 706         kfree(state);
 707 }
 708 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
 709
 710 /**
 711  * __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state
 712  * @obj: CRTC object
 713  * @state: new private object state
 714  *
 715  * Copies atomic state from a private objects's current state and resets inferred values.
 716  * This is useful for drivers that subclass the private state.
 717  */
 718 void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
 719                                                      struct drm_private_state *state)
 720 {
 721         memcpy(state, obj->state, sizeof(*state));
 722 }
 723 EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
 724
 725 /**
 726  * __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state
 727  * @bridge: bridge object
 728  * @state: atomic bridge state
 729  *
 730  * Copies atomic state from a bridge's current state and resets inferred values.
 731  * This is useful for drivers that subclass the bridge state.
 732  */
 733 void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
 734                                                 struct drm_bridge_state *state)
 735 {
 736         __drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
 737                                                         &state->base);
 738         state->bridge = bridge;
 739 }
 740 EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);
 741
 742 /**
 743  * drm_atomic_helper_bridge_duplicate_state() - Duplicate a bridge state object
 744  * @bridge: bridge object
 745  *
 746  * Allocates a new bridge state and initializes it with the current bridge
 747  * state values. This helper is meant to be used as a bridge
 748  * &drm_bridge_funcs.atomic_duplicate_state hook for bridges that don't
 749  * subclass the bridge state.
 750  */
 751 struct drm_bridge_state *
 752 drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge)
 753 {
 754         struct drm_bridge_state *new;
 755
 756         if (WARN_ON(!bridge->base.state))
 757                 return NULL;
 758
 759         new = kzalloc(sizeof(*new), GFP_KERNEL);
 760         if (new)
 761                 __drm_atomic_helper_bridge_duplicate_state(bridge, new);
 762
 763         return new;
 764 }
 765 EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);
 766
 767 /**
 768  * drm_atomic_helper_bridge_destroy_state() - Destroy a bridge state object
 769  * @bridge: the bridge this state refers to
 770  * @state: bridge state to destroy
 771  *
 772  * Destroys a bridge state previously created by
 773  * &drm_atomic_helper_bridge_reset() or
 774  * &drm_atomic_helper_bridge_duplicate_state(). This helper is meant to be
 775  * used as a bridge &drm_bridge_funcs.atomic_destroy_state hook for bridges
 776  * that don't subclass the bridge state.
 777  */
 778 void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
 779                                             struct drm_bridge_state *state)
 780 {
 781         kfree(state);
 782 }
 783 EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
 784
 785 /**
 786  * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its
 787  *                                      default
 788  * @bridge: the bridge this state refers to
 789  * @state: bridge state to initialize
 790  *
 791  * Initializes the bridge state to default values. This is meant to be called
 792  * by the bridge &drm_bridge_funcs.atomic_reset hook for bridges that subclass
 793  * the bridge state.
 794  */
 795 void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
 796                                       struct drm_bridge_state *state)
 797 {
 798         memset(state, 0, sizeof(*state));
 799         state->bridge = bridge;
 800 }
 801 EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
 802
 803 /**
 804  * drm_atomic_helper_bridge_reset() - Allocate and initialize a bridge state
 805  *                                    to its default
 806  * @bridge: the bridge this state refers to
 807  *
 808  * Allocates the bridge state and initializes it to default values. This helper
 809  * is meant to be used as a bridge &drm_bridge_funcs.atomic_reset hook for
 810  * bridges that don't subclass the bridge state.
 811  */
 812 struct drm_bridge_state *
 813 drm_atomic_helper_bridge_reset(struct drm_bridge *bridge)
 814 {
 815         struct drm_bridge_state *bridge_state;
 816
 817         bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL);
 818         if (!bridge_state)
 819                 return ERR_PTR(-ENOMEM);
 820
 821         __drm_atomic_helper_bridge_reset(bridge, bridge_state);
 822         return bridge_state;
 823 }
 824 EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);