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 EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset);
 280
 281 /**
 282  * __drm_atomic_helper_plane_reset - reset state on plane
 283  * @plane: drm plane
 284  * @plane_state: plane state to assign
 285  *
 286  * Initializes the newly allocated @plane_state and assigns it to
 287  * the &drm_crtc->state pointer of @plane, usually required when
 288  * initializing the drivers or when called from the &drm_plane_funcs.reset
 289  * hook.
 290  *
 291  * This is useful for drivers that subclass the plane state.
 292  */
 293 void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
 294                                      struct drm_plane_state *plane_state)
 295 {
 296         if (plane_state)
 297                 __drm_atomic_helper_plane_state_reset(plane_state, plane);
 298
 299         plane->state = plane_state;
 300 }
 301 EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);
 302
 303 /**
 304  * drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes
 305  * @plane: drm plane
 306  *
 307  * Resets the atomic state for @plane by freeing the state pointer (which might
 308  * be NULL, e.g. at driver load time) and allocating a new empty state object.
 309  */
 310 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
 311 {
 312         if (plane->state)
 313                 __drm_atomic_helper_plane_destroy_state(plane->state);
 314
 315         kfree(plane->state);
 316         plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
 317         if (plane->state)
 318                 __drm_atomic_helper_plane_reset(plane, plane->state);
 319 }
 320 EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
 321
 322 /**
 323  * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
 324  * @plane: plane object
 325  * @state: atomic plane state
 326  *
 327  * Copies atomic state from a plane's current state. This is useful for
 328  * drivers that subclass the plane state.
 329  */
 330 void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
 331                                                struct drm_plane_state *state)
 332 {
 333         memcpy(state, plane->state, sizeof(*state));
 334
 335         if (state->fb)
 336                 drm_framebuffer_get(state->fb);
 337
 338         state->fence = NULL;
 339         state->commit = NULL;
 340         state->fb_damage_clips = NULL;
 341 }
 342 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
 343
 344 /**
 345  * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
 346  * @plane: drm plane
 347  *
 348  * Default plane state duplicate hook for drivers which don't have their own
 349  * subclassed plane state structure.
 350  */
 351 struct drm_plane_state *
 352 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
 353 {
 354         struct drm_plane_state *state;
 355
 356         if (WARN_ON(!plane->state))
 357                 return NULL;
 358
 359         state = kmalloc(sizeof(*state), GFP_KERNEL);
 360         if (state)
 361                 __drm_atomic_helper_plane_duplicate_state(plane, state);
 362
 363         return state;
 364 }
 365 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
 366
 367 /**
 368  * __drm_atomic_helper_plane_destroy_state - release plane state
 369  * @state: plane state object to release
 370  *
 371  * Releases all resources stored in the plane state without actually freeing
 372  * the memory of the plane state. This is useful for drivers that subclass the
 373  * plane state.
 374  */
 375 void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 376 {
 377         if (state->fb)
 378                 drm_framebuffer_put(state->fb);
 379
 380         if (state->fence)
 381                 dma_fence_put(state->fence);
 382
 383         if (state->commit)
 384                 drm_crtc_commit_put(state->commit);
 385
 386         drm_property_blob_put(state->fb_damage_clips);
 387 }
 388 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 389
 390 /**
 391  * drm_atomic_helper_plane_destroy_state - default state destroy hook
 392  * @plane: drm plane
 393  * @state: plane state object to release
 394  *
 395  * Default plane state destroy hook for drivers which don't have their own
 396  * subclassed plane state structure.
 397  */
 398 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
 399                                            struct drm_plane_state *state)
 400 {
 401         __drm_atomic_helper_plane_destroy_state(state);
 402         kfree(state);
 403 }
 404 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
 405
 406 /**
 407  * __drm_atomic_helper_connector_state_reset - reset the connector state
 408  * @conn_state: atomic connector state, must not be NULL
 409  * @connector: connectotr object, must not be NULL
 410  *
 411  * Initializes the newly allocated @conn_state with default
 412  * values. This is useful for drivers that subclass the connector state.
 413  */
 414 void
 415 __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,
 416                                           struct drm_connector *connector)
 417 {
 418         conn_state->connector = connector;
 419 }
 420 EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset);
 421
 422 /**
 423  * __drm_atomic_helper_connector_reset - reset state on connector
 424  * @connector: drm connector
 425  * @conn_state: connector state to assign
 426  *
 427  * Initializes the newly allocated @conn_state and assigns it to
 428  * the &drm_connector->state pointer of @connector, usually required when
 429  * initializing the drivers or when called from the &drm_connector_funcs.reset
 430  * hook.
 431  *
 432  * This is useful for drivers that subclass the connector state.
 433  */
 434 void
 435 __drm_atomic_helper_connector_reset(struct drm_connector *connector,
 436                                     struct drm_connector_state *conn_state)
 437 {
 438         if (conn_state)
 439                 __drm_atomic_helper_connector_state_reset(conn_state, connector);
 440
 441         connector->state = conn_state;
 442 }
 443 EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
 444
 445 /**
 446  * drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors
 447  * @connector: drm connector
 448  *
 449  * Resets the atomic state for @connector by freeing the state pointer (which
 450  * might be NULL, e.g. at driver load time) and allocating a new empty state
 451  * object.
 452  */
 453 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
 454 {
 455         struct drm_connector_state *conn_state =
 456                 kzalloc(sizeof(*conn_state), GFP_KERNEL);
 457
 458         if (connector->state)
 459                 __drm_atomic_helper_connector_destroy_state(connector->state);
 460
 461         kfree(connector->state);
 462         __drm_atomic_helper_connector_reset(connector, conn_state);
 463 }
 464 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
 465
 466 /**
 467  * drm_atomic_helper_connector_tv_margins_reset - Resets TV connector properties
 468  * @connector: DRM connector
 469  *
 470  * Resets the TV-related properties attached to a connector.
 471  */
 472 void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector)
 473 {
 474         struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
 475         struct drm_connector_state *state = connector->state;
 476
 477         state->tv.margins.left = cmdline->tv_margins.left;
 478         state->tv.margins.right = cmdline->tv_margins.right;
 479         state->tv.margins.top = cmdline->tv_margins.top;
 480         state->tv.margins.bottom = cmdline->tv_margins.bottom;
 481 }
 482 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_margins_reset);
 483
 484 /**
 485  * drm_atomic_helper_connector_tv_reset - Resets Analog TV connector properties
 486  * @connector: DRM connector
 487  *
 488  * Resets the analog TV properties attached to a connector
 489  */
 490 void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
 491 {
 492         struct drm_device *dev = connector->dev;
 493         struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
 494         struct drm_connector_state *state = connector->state;
 495         struct drm_property *prop;
 496         uint64_t val;
 497
 498         prop = dev->mode_config.tv_mode_property;
 499         if (prop)
 500                 if (!drm_object_property_get_default_value(&connector->base,
 501                                                            prop, &val))
 502                         state->tv.mode = val;
 503
 504         if (cmdline->tv_mode_specified)
 505                 state->tv.mode = cmdline->tv_mode;
 506
 507         prop = dev->mode_config.tv_select_subconnector_property;
 508         if (prop)
 509                 if (!drm_object_property_get_default_value(&connector->base,
 510                                                            prop, &val))
 511                         state->tv.select_subconnector = val;
 512
 513         prop = dev->mode_config.tv_subconnector_property;
 514         if (prop)
 515                 if (!drm_object_property_get_default_value(&connector->base,
 516                                                            prop, &val))
 517                         state->tv.subconnector = val;
 518
 519         prop = dev->mode_config.tv_brightness_property;
 520         if (prop)
 521                 if (!drm_object_property_get_default_value(&connector->base,
 522                                                            prop, &val))
 523                         state->tv.brightness = val;
 524
 525         prop = dev->mode_config.tv_contrast_property;
 526         if (prop)
 527                 if (!drm_object_property_get_default_value(&connector->base,
 528                                                            prop, &val))
 529                         state->tv.contrast = val;
 530
 531         prop = dev->mode_config.tv_flicker_reduction_property;
 532         if (prop)
 533                 if (!drm_object_property_get_default_value(&connector->base,
 534                                                            prop, &val))
 535                         state->tv.flicker_reduction = val;
 536
 537         prop = dev->mode_config.tv_overscan_property;
 538         if (prop)
 539                 if (!drm_object_property_get_default_value(&connector->base,
 540                                                            prop, &val))
 541                         state->tv.overscan = val;
 542
 543         prop = dev->mode_config.tv_saturation_property;
 544         if (prop)
 545                 if (!drm_object_property_get_default_value(&connector->base,
 546                                                            prop, &val))
 547                         state->tv.saturation = val;
 548
 549         prop = dev->mode_config.tv_hue_property;
 550         if (prop)
 551                 if (!drm_object_property_get_default_value(&connector->base,
 552                                                            prop, &val))
 553                         state->tv.hue = val;
 554
 555         drm_atomic_helper_connector_tv_margins_reset(connector);
 556 }
 557 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
 558
 559 /**
 560  * drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
 561  * @connector: DRM Connector
 562  * @state: the DRM State object
 563  *
 564  * Checks the state object to see if the requested state is valid for an
 565  * analog TV connector.
 566  *
 567  * Return:
 568  * %0 for success, a negative error code on error.
 569  */
 570 int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 571                                          struct drm_atomic_state *state)
 572 {
 573         struct drm_connector_state *old_conn_state =
 574                 drm_atomic_get_old_connector_state(state, connector);
 575         struct drm_connector_state *new_conn_state =
 576                 drm_atomic_get_new_connector_state(state, connector);
 577         struct drm_crtc_state *crtc_state;
 578         struct drm_crtc *crtc;
 579
 580         crtc = new_conn_state->crtc;
 581         if (!crtc)
 582                 return 0;
 583
 584         crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 585         if (!crtc_state)
 586                 return -EINVAL;
 587
 588         if (old_conn_state->tv.mode != new_conn_state->tv.mode)
 589                 crtc_state->mode_changed = true;
 590
 591         if (old_conn_state->tv.margins.left != new_conn_state->tv.margins.left ||
 592             old_conn_state->tv.margins.right != new_conn_state->tv.margins.right ||
 593             old_conn_state->tv.margins.top != new_conn_state->tv.margins.top ||
 594             old_conn_state->tv.margins.bottom != new_conn_state->tv.margins.bottom ||
 595             old_conn_state->tv.mode != new_conn_state->tv.mode ||
 596             old_conn_state->tv.brightness != new_conn_state->tv.brightness ||
 597             old_conn_state->tv.contrast != new_conn_state->tv.contrast ||
 598             old_conn_state->tv.flicker_reduction != new_conn_state->tv.flicker_reduction ||
 599             old_conn_state->tv.overscan != new_conn_state->tv.overscan ||
 600             old_conn_state->tv.saturation != new_conn_state->tv.saturation ||
 601             old_conn_state->tv.hue != new_conn_state->tv.hue)
 602                 crtc_state->connectors_changed = true;
 603
 604         return 0;
 605 }
 606 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
 607
 608 /**
 609  * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
 610  * @connector: connector object
 611  * @state: atomic connector state
 612  *
 613  * Copies atomic state from a connector's current state. This is useful for
 614  * drivers that subclass the connector state.
 615  */
 616 void
 617 __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
 618                                             struct drm_connector_state *state)
 619 {
 620         memcpy(state, connector->state, sizeof(*state));
 621         if (state->crtc)
 622                 drm_connector_get(connector);
 623         state->commit = NULL;
 624
 625         if (state->hdr_output_metadata)
 626                 drm_property_blob_get(state->hdr_output_metadata);
 627
 628         /* Don't copy over a writeback job, they are used only once */
 629         state->writeback_job = NULL;
 630 }
 631 EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
 632
 633 /**
 634  * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
 635  * @connector: drm connector
 636  *
 637  * Default connector state duplicate hook for drivers which don't have their own
 638  * subclassed connector state structure.
 639  */
 640 struct drm_connector_state *
 641 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
 642 {
 643         struct drm_connector_state *state;
 644
 645         if (WARN_ON(!connector->state))
 646                 return NULL;
 647
 648         state = kmalloc(sizeof(*state), GFP_KERNEL);
 649         if (state)
 650                 __drm_atomic_helper_connector_duplicate_state(connector, state);
 651
 652         return state;
 653 }
 654 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
 655
 656 /**
 657  * __drm_atomic_helper_connector_destroy_state - release connector state
 658  * @state: connector state object to release
 659  *
 660  * Releases all resources stored in the connector state without actually
 661  * freeing the memory of the connector state. This is useful for drivers that
 662  * subclass the connector state.
 663  */
 664 void
 665 __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
 666 {
 667         if (state->crtc)
 668                 drm_connector_put(state->connector);
 669
 670         if (state->commit)
 671                 drm_crtc_commit_put(state->commit);
 672
 673         if (state->writeback_job)
 674                 drm_writeback_cleanup_job(state->writeback_job);
 675
 676         drm_property_blob_put(state->hdr_output_metadata);
 677 }
 678 EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
 679
 680 /**
 681  * drm_atomic_helper_connector_destroy_state - default state destroy hook
 682  * @connector: drm connector
 683  * @state: connector state object to release
 684  *
 685  * Default connector state destroy hook for drivers which don't have their own
 686  * subclassed connector state structure.
 687  */
 688 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
 689                                           struct drm_connector_state *state)
 690 {
 691         __drm_atomic_helper_connector_destroy_state(state);
 692         kfree(state);
 693 }
 694 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
 695
 696 /**
 697  * __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state
 698  * @obj: CRTC object
 699  * @state: new private object state
 700  *
 701  * Copies atomic state from a private objects's current state and resets inferred values.
 702  * This is useful for drivers that subclass the private state.
 703  */
 704 void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
 705                                                      struct drm_private_state *state)
 706 {
 707         memcpy(state, obj->state, sizeof(*state));
 708 }
 709 EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
 710
 711 /**
 712  * __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state
 713  * @bridge: bridge object
 714  * @state: atomic bridge state
 715  *
 716  * Copies atomic state from a bridge's current state and resets inferred values.
 717  * This is useful for drivers that subclass the bridge state.
 718  */
 719 void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
 720                                                 struct drm_bridge_state *state)
 721 {
 722         __drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
 723                                                         &state->base);
 724         state->bridge = bridge;
 725 }
 726 EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);
 727
 728 /**
 729  * drm_atomic_helper_bridge_duplicate_state() - Duplicate a bridge state object
 730  * @bridge: bridge object
 731  *
 732  * Allocates a new bridge state and initializes it with the current bridge
 733  * state values. This helper is meant to be used as a bridge
 734  * &drm_bridge_funcs.atomic_duplicate_state hook for bridges that don't
 735  * subclass the bridge state.
 736  */
 737 struct drm_bridge_state *
 738 drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge)
 739 {
 740         struct drm_bridge_state *new;
 741
 742         if (WARN_ON(!bridge->base.state))
 743                 return NULL;
 744
 745         new = kzalloc(sizeof(*new), GFP_KERNEL);
 746         if (new)
 747                 __drm_atomic_helper_bridge_duplicate_state(bridge, new);
 748
 749         return new;
 750 }
 751 EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);
 752
 753 /**
 754  * drm_atomic_helper_bridge_destroy_state() - Destroy a bridge state object
 755  * @bridge: the bridge this state refers to
 756  * @state: bridge state to destroy
 757  *
 758  * Destroys a bridge state previously created by
 759  * &drm_atomic_helper_bridge_reset() or
 760  * &drm_atomic_helper_bridge_duplicate_state(). This helper is meant to be
 761  * used as a bridge &drm_bridge_funcs.atomic_destroy_state hook for bridges
 762  * that don't subclass the bridge state.
 763  */
 764 void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
 765                                             struct drm_bridge_state *state)
 766 {
 767         kfree(state);
 768 }
 769 EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
 770
 771 /**
 772  * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its
 773  *                                      default
 774  * @bridge: the bridge this state refers to
 775  * @state: bridge state to initialize
 776  *
 777  * Initializes the bridge state to default values. This is meant to be called
 778  * by the bridge &drm_bridge_funcs.atomic_reset hook for bridges that subclass
 779  * the bridge state.
 780  */
 781 void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
 782                                       struct drm_bridge_state *state)
 783 {
 784         memset(state, 0, sizeof(*state));
 785         state->bridge = bridge;
 786 }
 787 EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
 788
 789 /**
 790  * drm_atomic_helper_bridge_reset() - Allocate and initialize a bridge state
 791  *                                    to its default
 792  * @bridge: the bridge this state refers to
 793  *
 794  * Allocates the bridge state and initializes it to default values. This helper
 795  * is meant to be used as a bridge &drm_bridge_funcs.atomic_reset hook for
 796  * bridges that don't subclass the bridge state.
 797  */
 798 struct drm_bridge_state *
 799 drm_atomic_helper_bridge_reset(struct drm_bridge *bridge)
 800 {
 801         struct drm_bridge_state *bridge_state;
 802
 803         bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL);
 804         if (!bridge_state)
 805                 return ERR_PTR(-ENOMEM);
 806
 807         __drm_atomic_helper_bridge_reset(bridge, bridge_state);
 808         return bridge_state;
 809 }
 810 EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);