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_bridge.h> 30 #include <drm/drm_connector.h> 31 #include <drm/drm_crtc.h> 32 #include <drm/drm_device.h> 33 #include <drm/drm_plane.h> 34 #include <drm/drm_print.h> 35 #include <drm/drm_writeback.h> 36 37 #include <linux/slab.h> 38 #include <linux/dma-fence.h> 39 40 /** 41 * DOC: atomic state reset and initialization 42 * 43 * Both the drm core and the atomic helpers assume that there is always the full 44 * and correct atomic software state for all connectors, CRTCs and planes 45 * available. Which is a bit a problem on driver load and also after system 46 * suspend. One way to solve this is to have a hardware state read-out 47 * infrastructure which reconstructs the full software state (e.g. the i915 48 * driver). 49 * 50 * The simpler solution is to just reset the software state to everything off, 51 * which is easiest to do by calling drm_mode_config_reset(). To facilitate this 52 * the atomic helpers provide default reset implementations for all hooks. 53 * 54 * On the upside the precise state tracking of atomic simplifies system suspend 55 * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe 56 * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume(). 57 * For other drivers the building blocks are split out, see the documentation 58 * for these functions. 59 */ 60 61 /** 62 * __drm_atomic_helper_crtc_state_reset - reset the CRTC state 63 * @crtc_state: atomic CRTC state, must not be NULL 64 * @crtc: CRTC object, must not be NULL 65 * 66 * Initializes the newly allocated @crtc_state with default 67 * values. This is useful for drivers that subclass the CRTC state. 68 */ 69 void 70 __drm_atomic_helper_crtc_state_reset(struct drm_crtc_state *crtc_state, 71 struct drm_crtc *crtc) 72 { 73 crtc_state->crtc = crtc; 74 } 75 EXPORT_SYMBOL(__drm_atomic_helper_crtc_state_reset); 76 77 /** 78 * __drm_atomic_helper_crtc_reset - reset state on CRTC 79 * @crtc: drm CRTC 80 * @crtc_state: CRTC state to assign 81 * 82 * Initializes the newly allocated @crtc_state and assigns it to 83 * the &drm_crtc->state pointer of @crtc, usually required when 84 * initializing the drivers or when called from the &drm_crtc_funcs.reset 85 * hook. 86 * 87 * This is useful for drivers that subclass the CRTC state. 88 */ 89 void 90 __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc, 91 struct drm_crtc_state *crtc_state) 92 { 93 if (crtc_state) 94 __drm_atomic_helper_crtc_state_reset(crtc_state, crtc); 95 96 crtc->state = crtc_state; 97 } 98 EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset); 99 100 /** 101 * drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.reset hook for CRTCs 102 * @crtc: drm CRTC 103 * 104 * Resets the atomic state for @crtc by freeing the state pointer (which might 105 * be NULL, e.g. at driver load time) and allocating a new empty state object. 106 */ 107 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc) 108 { 109 struct drm_crtc_state *crtc_state = 110 kzalloc(sizeof(*crtc->state), GFP_KERNEL); 111 112 if (crtc->state) 113 crtc->funcs->atomic_destroy_state(crtc, crtc->state); 114 115 __drm_atomic_helper_crtc_reset(crtc, crtc_state); 116 } 117 EXPORT_SYMBOL(drm_atomic_helper_crtc_reset); 118 119 /** 120 * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state 121 * @crtc: CRTC object 122 * @state: atomic CRTC state 123 * 124 * Copies atomic state from a CRTC's current state and resets inferred values. 125 * This is useful for drivers that subclass the CRTC state. 126 */ 127 void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc, 128 struct drm_crtc_state *state) 129 { 130 memcpy(state, crtc->state, sizeof(*state)); 131 132 if (state->mode_blob) 133 drm_property_blob_get(state->mode_blob); 134 if (state->degamma_lut) 135 drm_property_blob_get(state->degamma_lut); 136 if (state->ctm) 137 drm_property_blob_get(state->ctm); 138 if (state->gamma_lut) 139 drm_property_blob_get(state->gamma_lut); 140 state->mode_changed = false; 141 state->active_changed = false; 142 state->planes_changed = false; 143 state->connectors_changed = false; 144 state->color_mgmt_changed = false; 145 state->zpos_changed = false; 146 state->commit = NULL; 147 state->event = NULL; 148 state->async_flip = false; 149 150 /* Self refresh should be canceled when a new update is available */ 151 state->active = drm_atomic_crtc_effectively_active(state); 152 state->self_refresh_active = false; 153 } 154 EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state); 155 156 /** 157 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook 158 * @crtc: drm CRTC 159 * 160 * Default CRTC state duplicate hook for drivers which don't have their own 161 * subclassed CRTC state structure. 162 */ 163 struct drm_crtc_state * 164 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc) 165 { 166 struct drm_crtc_state *state; 167 168 if (WARN_ON(!crtc->state)) 169 return NULL; 170 171 state = kmalloc(sizeof(*state), GFP_KERNEL); 172 if (state) 173 __drm_atomic_helper_crtc_duplicate_state(crtc, state); 174 175 return state; 176 } 177 EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state); 178 179 /** 180 * __drm_atomic_helper_crtc_destroy_state - release CRTC state 181 * @state: CRTC state object to release 182 * 183 * Releases all resources stored in the CRTC state without actually freeing 184 * the memory of the CRTC state. This is useful for drivers that subclass the 185 * CRTC state. 186 */ 187 void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state) 188 { 189 if (state->commit) { 190 /* 191 * In the event that a non-blocking commit returns 192 * -ERESTARTSYS before the commit_tail work is queued, we will 193 * have an extra reference to the commit object. Release it, if 194 * the event has not been consumed by the worker. 195 * 196 * state->event may be freed, so we can't directly look at 197 * state->event->base.completion. 198 */ 199 if (state->event && state->commit->abort_completion) 200 drm_crtc_commit_put(state->commit); 201 202 kfree(state->commit->event); 203 state->commit->event = NULL; 204 205 drm_crtc_commit_put(state->commit); 206 } 207 208 drm_property_blob_put(state->mode_blob); 209 drm_property_blob_put(state->degamma_lut); 210 drm_property_blob_put(state->ctm); 211 drm_property_blob_put(state->gamma_lut); 212 } 213 EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state); 214 215 /** 216 * drm_atomic_helper_crtc_destroy_state - default state destroy hook 217 * @crtc: drm CRTC 218 * @state: CRTC state object to release 219 * 220 * Default CRTC state destroy hook for drivers which don't have their own 221 * subclassed CRTC state structure. 222 */ 223 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc, 224 struct drm_crtc_state *state) 225 { 226 __drm_atomic_helper_crtc_destroy_state(state); 227 kfree(state); 228 } 229 EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state); 230 231 /** 232 * __drm_atomic_helper_plane_state_reset - resets plane state to default values 233 * @plane_state: atomic plane state, must not be NULL 234 * @plane: plane object, must not be NULL 235 * 236 * Initializes the newly allocated @plane_state with default 237 * values. This is useful for drivers that subclass the CRTC state. 238 */ 239 void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state, 240 struct drm_plane *plane) 241 { 242 plane_state->plane = plane; 243 plane_state->rotation = DRM_MODE_ROTATE_0; 244 245 plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE; 246 plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI; 247 } 248 EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset); 249 250 /** 251 * __drm_atomic_helper_plane_reset - reset state on plane 252 * @plane: drm plane 253 * @plane_state: plane state to assign 254 * 255 * Initializes the newly allocated @plane_state and assigns it to 256 * the &drm_crtc->state pointer of @plane, usually required when 257 * initializing the drivers or when called from the &drm_plane_funcs.reset 258 * hook. 259 * 260 * This is useful for drivers that subclass the plane state. 261 */ 262 void __drm_atomic_helper_plane_reset(struct drm_plane *plane, 263 struct drm_plane_state *plane_state) 264 { 265 if (plane_state) 266 __drm_atomic_helper_plane_state_reset(plane_state, plane); 267 268 plane->state = plane_state; 269 } 270 EXPORT_SYMBOL(__drm_atomic_helper_plane_reset); 271 272 /** 273 * drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes 274 * @plane: drm plane 275 * 276 * Resets the atomic state for @plane by freeing the state pointer (which might 277 * be NULL, e.g. at driver load time) and allocating a new empty state object. 278 */ 279 void drm_atomic_helper_plane_reset(struct drm_plane *plane) 280 { 281 if (plane->state) 282 __drm_atomic_helper_plane_destroy_state(plane->state); 283 284 kfree(plane->state); 285 plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL); 286 if (plane->state) 287 __drm_atomic_helper_plane_reset(plane, plane->state); 288 } 289 EXPORT_SYMBOL(drm_atomic_helper_plane_reset); 290 291 /** 292 * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state 293 * @plane: plane object 294 * @state: atomic plane state 295 * 296 * Copies atomic state from a plane's current state. This is useful for 297 * drivers that subclass the plane state. 298 */ 299 void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane, 300 struct drm_plane_state *state) 301 { 302 memcpy(state, plane->state, sizeof(*state)); 303 304 if (state->fb) 305 drm_framebuffer_get(state->fb); 306 307 state->fence = NULL; 308 state->commit = NULL; 309 state->fb_damage_clips = NULL; 310 } 311 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state); 312 313 /** 314 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook 315 * @plane: drm plane 316 * 317 * Default plane state duplicate hook for drivers which don't have their own 318 * subclassed plane state structure. 319 */ 320 struct drm_plane_state * 321 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane) 322 { 323 struct drm_plane_state *state; 324 325 if (WARN_ON(!plane->state)) 326 return NULL; 327 328 state = kmalloc(sizeof(*state), GFP_KERNEL); 329 if (state) 330 __drm_atomic_helper_plane_duplicate_state(plane, state); 331 332 return state; 333 } 334 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state); 335 336 /** 337 * __drm_atomic_helper_plane_destroy_state - release plane state 338 * @state: plane state object to release 339 * 340 * Releases all resources stored in the plane state without actually freeing 341 * the memory of the plane state. This is useful for drivers that subclass the 342 * plane state. 343 */ 344 void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state) 345 { 346 if (state->fb) 347 drm_framebuffer_put(state->fb); 348 349 if (state->fence) 350 dma_fence_put(state->fence); 351 352 if (state->commit) 353 drm_crtc_commit_put(state->commit); 354 355 drm_property_blob_put(state->fb_damage_clips); 356 } 357 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state); 358 359 /** 360 * drm_atomic_helper_plane_destroy_state - default state destroy hook 361 * @plane: drm plane 362 * @state: plane state object to release 363 * 364 * Default plane state destroy hook for drivers which don't have their own 365 * subclassed plane state structure. 366 */ 367 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane, 368 struct drm_plane_state *state) 369 { 370 __drm_atomic_helper_plane_destroy_state(state); 371 kfree(state); 372 } 373 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state); 374 375 /** 376 * __drm_atomic_helper_connector_state_reset - reset the connector state 377 * @conn_state: atomic connector state, must not be NULL 378 * @connector: connectotr object, must not be NULL 379 * 380 * Initializes the newly allocated @conn_state with default 381 * values. This is useful for drivers that subclass the connector state. 382 */ 383 void 384 __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state, 385 struct drm_connector *connector) 386 { 387 conn_state->connector = connector; 388 } 389 EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset); 390 391 /** 392 * __drm_atomic_helper_connector_reset - reset state on connector 393 * @connector: drm connector 394 * @conn_state: connector state to assign 395 * 396 * Initializes the newly allocated @conn_state and assigns it to 397 * the &drm_connector->state pointer of @connector, usually required when 398 * initializing the drivers or when called from the &drm_connector_funcs.reset 399 * hook. 400 * 401 * This is useful for drivers that subclass the connector state. 402 */ 403 void 404 __drm_atomic_helper_connector_reset(struct drm_connector *connector, 405 struct drm_connector_state *conn_state) 406 { 407 if (conn_state) 408 __drm_atomic_helper_connector_state_reset(conn_state, connector); 409 410 connector->state = conn_state; 411 } 412 EXPORT_SYMBOL(__drm_atomic_helper_connector_reset); 413 414 /** 415 * drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors 416 * @connector: drm connector 417 * 418 * Resets the atomic state for @connector by freeing the state pointer (which 419 * might be NULL, e.g. at driver load time) and allocating a new empty state 420 * object. 421 */ 422 void drm_atomic_helper_connector_reset(struct drm_connector *connector) 423 { 424 struct drm_connector_state *conn_state = 425 kzalloc(sizeof(*conn_state), GFP_KERNEL); 426 427 if (connector->state) 428 __drm_atomic_helper_connector_destroy_state(connector->state); 429 430 kfree(connector->state); 431 __drm_atomic_helper_connector_reset(connector, conn_state); 432 } 433 EXPORT_SYMBOL(drm_atomic_helper_connector_reset); 434 435 /** 436 * drm_atomic_helper_connector_tv_reset - Resets TV connector properties 437 * @connector: DRM connector 438 * 439 * Resets the TV-related properties attached to a connector. 440 */ 441 void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector) 442 { 443 struct drm_cmdline_mode *cmdline = &connector->cmdline_mode; 444 struct drm_connector_state *state = connector->state; 445 446 state->tv.margins.left = cmdline->tv_margins.left; 447 state->tv.margins.right = cmdline->tv_margins.right; 448 state->tv.margins.top = cmdline->tv_margins.top; 449 state->tv.margins.bottom = cmdline->tv_margins.bottom; 450 } 451 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset); 452 453 /** 454 * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state 455 * @connector: connector object 456 * @state: atomic connector state 457 * 458 * Copies atomic state from a connector's current state. This is useful for 459 * drivers that subclass the connector state. 460 */ 461 void 462 __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector, 463 struct drm_connector_state *state) 464 { 465 memcpy(state, connector->state, sizeof(*state)); 466 if (state->crtc) 467 drm_connector_get(connector); 468 state->commit = NULL; 469 470 if (state->hdr_output_metadata) 471 drm_property_blob_get(state->hdr_output_metadata); 472 473 /* Don't copy over a writeback job, they are used only once */ 474 state->writeback_job = NULL; 475 } 476 EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state); 477 478 /** 479 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook 480 * @connector: drm connector 481 * 482 * Default connector state duplicate hook for drivers which don't have their own 483 * subclassed connector state structure. 484 */ 485 struct drm_connector_state * 486 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector) 487 { 488 struct drm_connector_state *state; 489 490 if (WARN_ON(!connector->state)) 491 return NULL; 492 493 state = kmalloc(sizeof(*state), GFP_KERNEL); 494 if (state) 495 __drm_atomic_helper_connector_duplicate_state(connector, state); 496 497 return state; 498 } 499 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state); 500 501 /** 502 * __drm_atomic_helper_connector_destroy_state - release connector state 503 * @state: connector state object to release 504 * 505 * Releases all resources stored in the connector state without actually 506 * freeing the memory of the connector state. This is useful for drivers that 507 * subclass the connector state. 508 */ 509 void 510 __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state) 511 { 512 if (state->crtc) 513 drm_connector_put(state->connector); 514 515 if (state->commit) 516 drm_crtc_commit_put(state->commit); 517 518 if (state->writeback_job) 519 drm_writeback_cleanup_job(state->writeback_job); 520 521 drm_property_blob_put(state->hdr_output_metadata); 522 } 523 EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state); 524 525 /** 526 * drm_atomic_helper_connector_destroy_state - default state destroy hook 527 * @connector: drm connector 528 * @state: connector state object to release 529 * 530 * Default connector state destroy hook for drivers which don't have their own 531 * subclassed connector state structure. 532 */ 533 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector, 534 struct drm_connector_state *state) 535 { 536 __drm_atomic_helper_connector_destroy_state(state); 537 kfree(state); 538 } 539 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state); 540 541 /** 542 * __drm_atomic_helper_private_duplicate_state - copy atomic private state 543 * @obj: CRTC object 544 * @state: new private object state 545 * 546 * Copies atomic state from a private objects's current state and resets inferred values. 547 * This is useful for drivers that subclass the private state. 548 */ 549 void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj, 550 struct drm_private_state *state) 551 { 552 memcpy(state, obj->state, sizeof(*state)); 553 } 554 EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state); 555 556 /** 557 * __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state 558 * @bridge: bridge object 559 * @state: atomic bridge state 560 * 561 * Copies atomic state from a bridge's current state and resets inferred values. 562 * This is useful for drivers that subclass the bridge state. 563 */ 564 void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge, 565 struct drm_bridge_state *state) 566 { 567 __drm_atomic_helper_private_obj_duplicate_state(&bridge->base, 568 &state->base); 569 state->bridge = bridge; 570 } 571 EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state); 572 573 /** 574 * drm_atomic_helper_bridge_duplicate_state() - Duplicate a bridge state object 575 * @bridge: bridge object 576 * 577 * Allocates a new bridge state and initializes it with the current bridge 578 * state values. This helper is meant to be used as a bridge 579 * &drm_bridge_funcs.atomic_duplicate_state hook for bridges that don't 580 * subclass the bridge state. 581 */ 582 struct drm_bridge_state * 583 drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge) 584 { 585 struct drm_bridge_state *new; 586 587 if (WARN_ON(!bridge->base.state)) 588 return NULL; 589 590 new = kzalloc(sizeof(*new), GFP_KERNEL); 591 if (new) 592 __drm_atomic_helper_bridge_duplicate_state(bridge, new); 593 594 return new; 595 } 596 EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state); 597 598 /** 599 * drm_atomic_helper_bridge_destroy_state() - Destroy a bridge state object 600 * @bridge: the bridge this state refers to 601 * @state: bridge state to destroy 602 * 603 * Destroys a bridge state previously created by 604 * &drm_atomic_helper_bridge_reset() or 605 * &drm_atomic_helper_bridge_duplicate_state(). This helper is meant to be 606 * used as a bridge &drm_bridge_funcs.atomic_destroy_state hook for bridges 607 * that don't subclass the bridge state. 608 */ 609 void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge, 610 struct drm_bridge_state *state) 611 { 612 kfree(state); 613 } 614 EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state); 615 616 /** 617 * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its 618 * default 619 * @bridge: the bridge this state refers to 620 * @state: bridge state to initialize 621 * 622 * Initializes the bridge state to default values. This is meant to be called 623 * by the bridge &drm_bridge_funcs.atomic_reset hook for bridges that subclass 624 * the bridge state. 625 */ 626 void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge, 627 struct drm_bridge_state *state) 628 { 629 memset(state, 0, sizeof(*state)); 630 state->bridge = bridge; 631 } 632 EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset); 633 634 /** 635 * drm_atomic_helper_bridge_reset() - Allocate and initialize a bridge state 636 * to its default 637 * @bridge: the bridge this state refers to 638 * 639 * Allocates the bridge state and initializes it to default values. This helper 640 * is meant to be used as a bridge &drm_bridge_funcs.atomic_reset hook for 641 * bridges that don't subclass the bridge state. 642 */ 643 struct drm_bridge_state * 644 drm_atomic_helper_bridge_reset(struct drm_bridge *bridge) 645 { 646 struct drm_bridge_state *bridge_state; 647 648 bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL); 649 if (!bridge_state) 650 return ERR_PTR(-ENOMEM); 651 652 __drm_atomic_helper_bridge_reset(bridge, bridge_state); 653 return bridge_state; 654 } 655 EXPORT_SYMBOL(drm_atomic_helper_bridge_reset); 656