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->zpos_property) {
 271                 if (!drm_object_property_get_default_value(&plane->base,
 272                                                            plane->zpos_property,
 273                                                            &val)) {
 274                         plane_state->zpos = val;
 275                         plane_state->normalized_zpos = val;
 276                 }
 277         }
 278
 279         if (plane->hotspot_x_property) {
 280                 if (!drm_object_property_get_default_value(&plane->base,
 281                                                            plane->hotspot_x_property,
 282                                                            &val))
 283                         plane_state->hotspot_x = val;
 284         }
 285
 286         if (plane->hotspot_y_property) {
 287                 if (!drm_object_property_get_default_value(&plane->base,
 288                                                            plane->hotspot_y_property,
 289                                                            &val))
 290                         plane_state->hotspot_y = val;
 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         state->color_mgmt_changed = false;
 356 }
 357 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
 358
 359 /**
 360  * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
 361  * @plane: drm plane
 362  *
 363  * Default plane state duplicate hook for drivers which don't have their own
 364  * subclassed plane state structure.
 365  */
 366 struct drm_plane_state *
 367 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
 368 {
 369         struct drm_plane_state *state;
 370
 371         if (WARN_ON(!plane->state))
 372                 return NULL;
 373
 374         state = kmalloc(sizeof(*state), GFP_KERNEL);
 375         if (state)
 376                 __drm_atomic_helper_plane_duplicate_state(plane, state);
 377
 378         return state;
 379 }
 380 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
 381
 382 /**
 383  * __drm_atomic_helper_plane_destroy_state - release plane state
 384  * @state: plane state object to release
 385  *
 386  * Releases all resources stored in the plane state without actually freeing
 387  * the memory of the plane state. This is useful for drivers that subclass the
 388  * plane state.
 389  */
 390 void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 391 {
 392         if (state->fb)
 393                 drm_framebuffer_put(state->fb);
 394
 395         if (state->fence)
 396                 dma_fence_put(state->fence);
 397
 398         if (state->commit)
 399                 drm_crtc_commit_put(state->commit);
 400
 401         drm_property_blob_put(state->fb_damage_clips);
 402 }
 403 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 404
 405 /**
 406  * drm_atomic_helper_plane_destroy_state - default state destroy hook
 407  * @plane: drm plane
 408  * @state: plane state object to release
 409  *
 410  * Default plane state destroy hook for drivers which don't have their own
 411  * subclassed plane state structure.
 412  */
 413 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
 414                                            struct drm_plane_state *state)
 415 {
 416         __drm_atomic_helper_plane_destroy_state(state);
 417         kfree(state);
 418 }
 419 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
 420
 421 /**
 422  * __drm_atomic_helper_connector_state_reset - reset the connector state
 423  * @conn_state: atomic connector state, must not be NULL
 424  * @connector: connectotr object, must not be NULL
 425  *
 426  * Initializes the newly allocated @conn_state with default
 427  * values. This is useful for drivers that subclass the connector state.
 428  */
 429 void
 430 __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,
 431                                           struct drm_connector *connector)
 432 {
 433         conn_state->connector = connector;
 434 }
 435 EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset);
 436
 437 /**
 438  * __drm_atomic_helper_connector_reset - reset state on connector
 439  * @connector: drm connector
 440  * @conn_state: connector state to assign
 441  *
 442  * Initializes the newly allocated @conn_state and assigns it to
 443  * the &drm_connector->state pointer of @connector, usually required when
 444  * initializing the drivers or when called from the &drm_connector_funcs.reset
 445  * hook.
 446  *
 447  * This is useful for drivers that subclass the connector state.
 448  */
 449 void
 450 __drm_atomic_helper_connector_reset(struct drm_connector *connector,
 451                                     struct drm_connector_state *conn_state)
 452 {
 453         if (conn_state)
 454                 __drm_atomic_helper_connector_state_reset(conn_state, connector);
 455
 456         connector->state = conn_state;
 457 }
 458 EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
 459
 460 /**
 461  * drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors
 462  * @connector: drm connector
 463  *
 464  * Resets the atomic state for @connector by freeing the state pointer (which
 465  * might be NULL, e.g. at driver load time) and allocating a new empty state
 466  * object.
 467  */
 468 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
 469 {
 470         struct drm_connector_state *conn_state =
 471                 kzalloc(sizeof(*conn_state), GFP_KERNEL);
 472
 473         if (connector->state)
 474                 __drm_atomic_helper_connector_destroy_state(connector->state);
 475
 476         kfree(connector->state);
 477         __drm_atomic_helper_connector_reset(connector, conn_state);
 478 }
 479 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
 480
 481 /**
 482  * drm_atomic_helper_connector_tv_margins_reset - Resets TV connector properties
 483  * @connector: DRM connector
 484  *
 485  * Resets the TV-related properties attached to a connector.
 486  */
 487 void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector)
 488 {
 489         struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
 490         struct drm_connector_state *state = connector->state;
 491
 492         state->tv.margins.left = cmdline->tv_margins.left;
 493         state->tv.margins.right = cmdline->tv_margins.right;
 494         state->tv.margins.top = cmdline->tv_margins.top;
 495         state->tv.margins.bottom = cmdline->tv_margins.bottom;
 496 }
 497 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_margins_reset);
 498
 499 /**
 500  * drm_atomic_helper_connector_tv_reset - Resets Analog TV connector properties
 501  * @connector: DRM connector
 502  *
 503  * Resets the analog TV properties attached to a connector
 504  */
 505 void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
 506 {
 507         struct drm_device *dev = connector->dev;
 508         struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
 509         struct drm_connector_state *state = connector->state;
 510         struct drm_property *prop;
 511         uint64_t val;
 512
 513         prop = dev->mode_config.tv_mode_property;
 514         if (prop)
 515                 if (!drm_object_property_get_default_value(&connector->base,
 516                                                            prop, &val))
 517                         state->tv.mode = val;
 518
 519         if (cmdline->tv_mode_specified)
 520                 state->tv.mode = cmdline->tv_mode;
 521
 522         prop = dev->mode_config.tv_select_subconnector_property;
 523         if (prop)
 524                 if (!drm_object_property_get_default_value(&connector->base,
 525                                                            prop, &val))
 526                         state->tv.select_subconnector = val;
 527
 528         prop = dev->mode_config.tv_subconnector_property;
 529         if (prop)
 530                 if (!drm_object_property_get_default_value(&connector->base,
 531                                                            prop, &val))
 532                         state->tv.subconnector = val;
 533
 534         prop = dev->mode_config.tv_brightness_property;
 535         if (prop)
 536                 if (!drm_object_property_get_default_value(&connector->base,
 537                                                            prop, &val))
 538                         state->tv.brightness = val;
 539
 540         prop = dev->mode_config.tv_contrast_property;
 541         if (prop)
 542                 if (!drm_object_property_get_default_value(&connector->base,
 543                                                            prop, &val))
 544                         state->tv.contrast = val;
 545
 546         prop = dev->mode_config.tv_flicker_reduction_property;
 547         if (prop)
 548                 if (!drm_object_property_get_default_value(&connector->base,
 549                                                            prop, &val))
 550                         state->tv.flicker_reduction = val;
 551
 552         prop = dev->mode_config.tv_overscan_property;
 553         if (prop)
 554                 if (!drm_object_property_get_default_value(&connector->base,
 555                                                            prop, &val))
 556                         state->tv.overscan = val;
 557
 558         prop = dev->mode_config.tv_saturation_property;
 559         if (prop)
 560                 if (!drm_object_property_get_default_value(&connector->base,
 561                                                            prop, &val))
 562                         state->tv.saturation = val;
 563
 564         prop = dev->mode_config.tv_hue_property;
 565         if (prop)
 566                 if (!drm_object_property_get_default_value(&connector->base,
 567                                                            prop, &val))
 568                         state->tv.hue = val;
 569
 570         drm_atomic_helper_connector_tv_margins_reset(connector);
 571 }
 572 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
 573
 574 /**
 575  * drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
 576  * @connector: DRM Connector
 577  * @state: the DRM State object
 578  *
 579  * Checks the state object to see if the requested state is valid for an
 580  * analog TV connector.
 581  *
 582  * Return:
 583  * %0 for success, a negative error code on error.
 584  */
 585 int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 586                                          struct drm_atomic_state *state)
 587 {
 588         struct drm_connector_state *old_conn_state =
 589                 drm_atomic_get_old_connector_state(state, connector);
 590         struct drm_connector_state *new_conn_state =
 591                 drm_atomic_get_new_connector_state(state, connector);
 592         struct drm_crtc_state *crtc_state;
 593         struct drm_crtc *crtc;
 594
 595         crtc = new_conn_state->crtc;
 596         if (!crtc)
 597                 return 0;
 598
 599         crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 600         if (!crtc_state)
 601                 return -EINVAL;
 602
 603         if (old_conn_state->tv.mode != new_conn_state->tv.mode)
 604                 crtc_state->mode_changed = true;
 605
 606         if (old_conn_state->tv.margins.left != new_conn_state->tv.margins.left ||
 607             old_conn_state->tv.margins.right != new_conn_state->tv.margins.right ||
 608             old_conn_state->tv.margins.top != new_conn_state->tv.margins.top ||
 609             old_conn_state->tv.margins.bottom != new_conn_state->tv.margins.bottom ||
 610             old_conn_state->tv.mode != new_conn_state->tv.mode ||
 611             old_conn_state->tv.brightness != new_conn_state->tv.brightness ||
 612             old_conn_state->tv.contrast != new_conn_state->tv.contrast ||
 613             old_conn_state->tv.flicker_reduction != new_conn_state->tv.flicker_reduction ||
 614             old_conn_state->tv.overscan != new_conn_state->tv.overscan ||
 615             old_conn_state->tv.saturation != new_conn_state->tv.saturation ||
 616             old_conn_state->tv.hue != new_conn_state->tv.hue)
 617                 crtc_state->connectors_changed = true;
 618
 619         return 0;
 620 }
 621 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
 622
 623 /**
 624  * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
 625  * @connector: connector object
 626  * @state: atomic connector state
 627  *
 628  * Copies atomic state from a connector's current state. This is useful for
 629  * drivers that subclass the connector state.
 630  */
 631 void
 632 __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
 633                                             struct drm_connector_state *state)
 634 {
 635         memcpy(state, connector->state, sizeof(*state));
 636         if (state->crtc)
 637                 drm_connector_get(connector);
 638         state->commit = NULL;
 639
 640         if (state->hdr_output_metadata)
 641                 drm_property_blob_get(state->hdr_output_metadata);
 642
 643         /* Don't copy over a writeback job, they are used only once */
 644         state->writeback_job = NULL;
 645 }
 646 EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
 647
 648 /**
 649  * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
 650  * @connector: drm connector
 651  *
 652  * Default connector state duplicate hook for drivers which don't have their own
 653  * subclassed connector state structure.
 654  */
 655 struct drm_connector_state *
 656 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
 657 {
 658         struct drm_connector_state *state;
 659
 660         if (WARN_ON(!connector->state))
 661                 return NULL;
 662
 663         state = kmalloc(sizeof(*state), GFP_KERNEL);
 664         if (state)
 665                 __drm_atomic_helper_connector_duplicate_state(connector, state);
 666
 667         return state;
 668 }
 669 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
 670
 671 /**
 672  * __drm_atomic_helper_connector_destroy_state - release connector state
 673  * @state: connector state object to release
 674  *
 675  * Releases all resources stored in the connector state without actually
 676  * freeing the memory of the connector state. This is useful for drivers that
 677  * subclass the connector state.
 678  */
 679 void
 680 __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
 681 {
 682         if (state->crtc)
 683                 drm_connector_put(state->connector);
 684
 685         if (state->commit)
 686                 drm_crtc_commit_put(state->commit);
 687
 688         if (state->writeback_job)
 689                 drm_writeback_cleanup_job(state->writeback_job);
 690
 691         drm_property_blob_put(state->hdr_output_metadata);
 692 }
 693 EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
 694
 695 /**
 696  * drm_atomic_helper_connector_destroy_state - default state destroy hook
 697  * @connector: drm connector
 698  * @state: connector state object to release
 699  *
 700  * Default connector state destroy hook for drivers which don't have their own
 701  * subclassed connector state structure.
 702  */
 703 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
 704                                           struct drm_connector_state *state)
 705 {
 706         __drm_atomic_helper_connector_destroy_state(state);
 707         kfree(state);
 708 }
 709 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
 710
 711 /**
 712  * __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state
 713  * @obj: CRTC object
 714  * @state: new private object state
 715  *
 716  * Copies atomic state from a private objects's current state and resets inferred values.
 717  * This is useful for drivers that subclass the private state.
 718  */
 719 void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
 720                                                      struct drm_private_state *state)
 721 {
 722         memcpy(state, obj->state, sizeof(*state));
 723 }
 724 EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
 725
 726 /**
 727  * __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state
 728  * @bridge: bridge object
 729  * @state: atomic bridge state
 730  *
 731  * Copies atomic state from a bridge's current state and resets inferred values.
 732  * This is useful for drivers that subclass the bridge state.
 733  */
 734 void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
 735                                                 struct drm_bridge_state *state)
 736 {
 737         __drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
 738                                                         &state->base);
 739         state->bridge = bridge;
 740 }
 741 EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);
 742
 743 /**
 744  * drm_atomic_helper_bridge_duplicate_state() - Duplicate a bridge state object
 745  * @bridge: bridge object
 746  *
 747  * Allocates a new bridge state and initializes it with the current bridge
 748  * state values. This helper is meant to be used as a bridge
 749  * &drm_bridge_funcs.atomic_duplicate_state hook for bridges that don't
 750  * subclass the bridge state.
 751  */
 752 struct drm_bridge_state *
 753 drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge)
 754 {
 755         struct drm_bridge_state *new;
 756
 757         if (WARN_ON(!bridge->base.state))
 758                 return NULL;
 759
 760         new = kzalloc(sizeof(*new), GFP_KERNEL);
 761         if (new)
 762                 __drm_atomic_helper_bridge_duplicate_state(bridge, new);
 763
 764         return new;
 765 }
 766 EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);
 767
 768 /**
 769  * drm_atomic_helper_bridge_destroy_state() - Destroy a bridge state object
 770  * @bridge: the bridge this state refers to
 771  * @state: bridge state to destroy
 772  *
 773  * Destroys a bridge state previously created by
 774  * &drm_atomic_helper_bridge_reset() or
 775  * &drm_atomic_helper_bridge_duplicate_state(). This helper is meant to be
 776  * used as a bridge &drm_bridge_funcs.atomic_destroy_state hook for bridges
 777  * that don't subclass the bridge state.
 778  */
 779 void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
 780                                             struct drm_bridge_state *state)
 781 {
 782         kfree(state);
 783 }
 784 EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
 785
 786 /**
 787  * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its
 788  *                                      default
 789  * @bridge: the bridge this state refers to
 790  * @state: bridge state to initialize
 791  *
 792  * Initializes the bridge state to default values. This is meant to be called
 793  * by the bridge &drm_bridge_funcs.atomic_reset hook for bridges that subclass
 794  * the bridge state.
 795  */
 796 void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
 797                                       struct drm_bridge_state *state)
 798 {
 799         memset(state, 0, sizeof(*state));
 800         state->bridge = bridge;
 801 }
 802 EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
 803
 804 /**
 805  * drm_atomic_helper_bridge_reset() - Allocate and initialize a bridge state
 806  *                                    to its default
 807  * @bridge: the bridge this state refers to
 808  *
 809  * Allocates the bridge state and initializes it to default values. This helper
 810  * is meant to be used as a bridge &drm_bridge_funcs.atomic_reset hook for
 811  * bridges that don't subclass the bridge state.
 812  */
 813 struct drm_bridge_state *
 814 drm_atomic_helper_bridge_reset(struct drm_bridge *bridge)
 815 {
 816         struct drm_bridge_state *bridge_state;
 817
 818         bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL);
 819         if (!bridge_state)
 820                 return ERR_PTR(-ENOMEM);
 821
 822         __drm_atomic_helper_bridge_reset(bridge, bridge_state);
 823         return bridge_state;
 824 }
 825 EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);