826 lines · c
1/*2 * Copyright (C) 2018 Intel Corp.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * 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 initialization45 *46 * Both the drm core and the atomic helpers assume that there is always the full47 * and correct atomic software state for all connectors, CRTCs and planes48 * available. Which is a bit a problem on driver load and also after system49 * suspend. One way to solve this is to have a hardware state read-out50 * infrastructure which reconstructs the full software state (e.g. the i91551 * 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 this55 * the atomic helpers provide default reset implementations for all hooks.56 *57 * On the upside the precise state tracking of atomic simplifies system suspend58 * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe59 * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume().60 * For other drivers the building blocks are split out, see the documentation61 * for these functions.62 */63 64/**65 * __drm_atomic_helper_crtc_state_reset - reset the CRTC state66 * @crtc_state: atomic CRTC state, must not be NULL67 * @crtc: CRTC object, must not be NULL68 *69 * Initializes the newly allocated @crtc_state with default70 * values. This is useful for drivers that subclass the CRTC state.71 */72void73__drm_atomic_helper_crtc_state_reset(struct drm_crtc_state *crtc_state,74 struct drm_crtc *crtc)75{76 crtc_state->crtc = crtc;77}78EXPORT_SYMBOL(__drm_atomic_helper_crtc_state_reset);79 80/**81 * __drm_atomic_helper_crtc_reset - reset state on CRTC82 * @crtc: drm CRTC83 * @crtc_state: CRTC state to assign84 *85 * Initializes the newly allocated @crtc_state and assigns it to86 * the &drm_crtc->state pointer of @crtc, usually required when87 * initializing the drivers or when called from the &drm_crtc_funcs.reset88 * hook.89 *90 * This is useful for drivers that subclass the CRTC state.91 */92void93__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}104EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);105 106/**107 * drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.reset hook for CRTCs108 * @crtc: drm CRTC109 *110 * Resets the atomic state for @crtc by freeing the state pointer (which might111 * be NULL, e.g. at driver load time) and allocating a new empty state object.112 */113void 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}123EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);124 125/**126 * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state127 * @crtc: CRTC object128 * @state: atomic CRTC state129 *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 */133void __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}160EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);161 162/**163 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook164 * @crtc: drm CRTC165 *166 * Default CRTC state duplicate hook for drivers which don't have their own167 * subclassed CRTC state structure.168 */169struct drm_crtc_state *170drm_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}183EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);184 185/**186 * __drm_atomic_helper_crtc_destroy_state - release CRTC state187 * @state: CRTC state object to release188 *189 * Releases all resources stored in the CRTC state without actually freeing190 * the memory of the CRTC state. This is useful for drivers that subclass the191 * CRTC state.192 */193void __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 returns198 * -ERESTARTSYS before the commit_tail work is queued, we will199 * have an extra reference to the commit object. Release it, if200 * the event has not been consumed by the worker.201 *202 * state->event may be freed, so we can't directly look at203 * 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}219EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);220 221/**222 * drm_atomic_helper_crtc_destroy_state - default state destroy hook223 * @crtc: drm CRTC224 * @state: CRTC state object to release225 *226 * Default CRTC state destroy hook for drivers which don't have their own227 * subclassed CRTC state structure.228 */229void 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}235EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);236 237/**238 * __drm_atomic_helper_plane_state_reset - resets plane state to default values239 * @plane_state: atomic plane state, must not be NULL240 * @plane: plane object, must not be NULL241 *242 * Initializes the newly allocated @plane_state with default243 * values. This is useful for drivers that subclass the CRTC state.244 */245void __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}293EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset);294 295/**296 * __drm_atomic_helper_plane_reset - reset state on plane297 * @plane: drm plane298 * @plane_state: plane state to assign299 *300 * Initializes the newly allocated @plane_state and assigns it to301 * the &drm_crtc->state pointer of @plane, usually required when302 * initializing the drivers or when called from the &drm_plane_funcs.reset303 * hook.304 *305 * This is useful for drivers that subclass the plane state.306 */307void __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}315EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);316 317/**318 * drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes319 * @plane: drm plane320 *321 * Resets the atomic state for @plane by freeing the state pointer (which might322 * be NULL, e.g. at driver load time) and allocating a new empty state object.323 */324void 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}334EXPORT_SYMBOL(drm_atomic_helper_plane_reset);335 336/**337 * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state338 * @plane: plane object339 * @state: atomic plane state340 *341 * Copies atomic state from a plane's current state. This is useful for342 * drivers that subclass the plane state.343 */344void __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}357EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);358 359/**360 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook361 * @plane: drm plane362 *363 * Default plane state duplicate hook for drivers which don't have their own364 * subclassed plane state structure.365 */366struct drm_plane_state *367drm_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}380EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);381 382/**383 * __drm_atomic_helper_plane_destroy_state - release plane state384 * @state: plane state object to release385 *386 * Releases all resources stored in the plane state without actually freeing387 * the memory of the plane state. This is useful for drivers that subclass the388 * plane state.389 */390void __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}403EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);404 405/**406 * drm_atomic_helper_plane_destroy_state - default state destroy hook407 * @plane: drm plane408 * @state: plane state object to release409 *410 * Default plane state destroy hook for drivers which don't have their own411 * subclassed plane state structure.412 */413void 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}419EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);420 421/**422 * __drm_atomic_helper_connector_state_reset - reset the connector state423 * @conn_state: atomic connector state, must not be NULL424 * @connector: connectotr object, must not be NULL425 *426 * Initializes the newly allocated @conn_state with default427 * values. This is useful for drivers that subclass the connector state.428 */429void430__drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,431 struct drm_connector *connector)432{433 conn_state->connector = connector;434}435EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset);436 437/**438 * __drm_atomic_helper_connector_reset - reset state on connector439 * @connector: drm connector440 * @conn_state: connector state to assign441 *442 * Initializes the newly allocated @conn_state and assigns it to443 * the &drm_connector->state pointer of @connector, usually required when444 * initializing the drivers or when called from the &drm_connector_funcs.reset445 * hook.446 *447 * This is useful for drivers that subclass the connector state.448 */449void450__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}458EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);459 460/**461 * drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors462 * @connector: drm connector463 *464 * Resets the atomic state for @connector by freeing the state pointer (which465 * might be NULL, e.g. at driver load time) and allocating a new empty state466 * object.467 */468void 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}479EXPORT_SYMBOL(drm_atomic_helper_connector_reset);480 481/**482 * drm_atomic_helper_connector_tv_margins_reset - Resets TV connector properties483 * @connector: DRM connector484 *485 * Resets the TV-related properties attached to a connector.486 */487void 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}497EXPORT_SYMBOL(drm_atomic_helper_connector_tv_margins_reset);498 499/**500 * drm_atomic_helper_connector_tv_reset - Resets Analog TV connector properties501 * @connector: DRM connector502 *503 * Resets the analog TV properties attached to a connector504 */505void 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}572EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);573 574/**575 * drm_atomic_helper_connector_tv_check - Validate an analog TV connector state576 * @connector: DRM Connector577 * @state: the DRM State object578 *579 * Checks the state object to see if the requested state is valid for an580 * analog TV connector.581 *582 * Return:583 * %0 for success, a negative error code on error.584 */585int 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}621EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);622 623/**624 * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state625 * @connector: connector object626 * @state: atomic connector state627 *628 * Copies atomic state from a connector's current state. This is useful for629 * drivers that subclass the connector state.630 */631void632__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}646EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);647 648/**649 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook650 * @connector: drm connector651 *652 * Default connector state duplicate hook for drivers which don't have their own653 * subclassed connector state structure.654 */655struct drm_connector_state *656drm_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}669EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);670 671/**672 * __drm_atomic_helper_connector_destroy_state - release connector state673 * @state: connector state object to release674 *675 * Releases all resources stored in the connector state without actually676 * freeing the memory of the connector state. This is useful for drivers that677 * subclass the connector state.678 */679void680__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}693EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);694 695/**696 * drm_atomic_helper_connector_destroy_state - default state destroy hook697 * @connector: drm connector698 * @state: connector state object to release699 *700 * Default connector state destroy hook for drivers which don't have their own701 * subclassed connector state structure.702 */703void 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}709EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);710 711/**712 * __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state713 * @obj: CRTC object714 * @state: new private object state715 *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 */719void __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}724EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);725 726/**727 * __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state728 * @bridge: bridge object729 * @state: atomic bridge state730 *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 */734void __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}741EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);742 743/**744 * drm_atomic_helper_bridge_duplicate_state() - Duplicate a bridge state object745 * @bridge: bridge object746 *747 * Allocates a new bridge state and initializes it with the current bridge748 * state values. This helper is meant to be used as a bridge749 * &drm_bridge_funcs.atomic_duplicate_state hook for bridges that don't750 * subclass the bridge state.751 */752struct drm_bridge_state *753drm_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}766EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);767 768/**769 * drm_atomic_helper_bridge_destroy_state() - Destroy a bridge state object770 * @bridge: the bridge this state refers to771 * @state: bridge state to destroy772 *773 * Destroys a bridge state previously created by774 * &drm_atomic_helper_bridge_reset() or775 * &drm_atomic_helper_bridge_duplicate_state(). This helper is meant to be776 * used as a bridge &drm_bridge_funcs.atomic_destroy_state hook for bridges777 * that don't subclass the bridge state.778 */779void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,780 struct drm_bridge_state *state)781{782 kfree(state);783}784EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);785 786/**787 * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its788 * default789 * @bridge: the bridge this state refers to790 * @state: bridge state to initialize791 *792 * Initializes the bridge state to default values. This is meant to be called793 * by the bridge &drm_bridge_funcs.atomic_reset hook for bridges that subclass794 * the bridge state.795 */796void __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}802EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);803 804/**805 * drm_atomic_helper_bridge_reset() - Allocate and initialize a bridge state806 * to its default807 * @bridge: the bridge this state refers to808 *809 * Allocates the bridge state and initializes it to default values. This helper810 * is meant to be used as a bridge &drm_bridge_funcs.atomic_reset hook for811 * bridges that don't subclass the bridge state.812 */813struct drm_bridge_state *814drm_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}825EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);826