drivers/gpu/drm/drm_plane_helper.c

   1 /*
   2  * Copyright (C) 2014 Intel Corporation
   3  *
   4  * DRM universal plane helper functions
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #include <linux/list.h>
  27 #include <drm/drmP.h>
  28 #include <drm/drm_plane_helper.h>
  29 #include <drm/drm_rect.h>
  30 #include <drm/drm_atomic.h>
  31 #include <drm/drm_crtc_helper.h>
  32 #include <drm/drm_atomic_helper.h>
  33
  34 #define SUBPIXEL_MASK 0xffff
  35
  36 /**
  37  * DOC: overview
  38  *
  39  * This helper library has two parts. The first part has support to implement
  40  * primary plane support on top of the normal CRTC configuration interface.
  41  * Since the legacy ->set_config interface ties the primary plane together with
  42  * the CRTC state this does not allow userspace to disable the primary plane
  43  * itself.  To avoid too much duplicated code use
  44  * drm_plane_helper_check_update() which can be used to enforce the same
  45  * restrictions as primary planes had thus. The default primary plane only
  46  * expose XRBG8888 and ARGB8888 as valid pixel formats for the attached
  47  * framebuffer.
  48  *
  49  * Drivers are highly recommended to implement proper support for primary
  50  * planes, and newly merged drivers must not rely upon these transitional
  51  * helpers.
  52  *
  53  * The second part also implements transitional helpers which allow drivers to
  54  * gradually switch to the atomic helper infrastructure for plane updates. Once
  55  * that switch is complete drivers shouldn't use these any longer, instead using
  56  * the proper legacy implementations for update and disable plane hooks provided
  57  * by the atomic helpers.
  58  *
  59  * Again drivers are strongly urged to switch to the new interfaces.
  60  *
  61  * The plane helpers share the function table structures with other helpers,
  62  * specifically also the atomic helpers. See struct &drm_plane_helper_funcs for
  63  * the details.
  64  */
  65
  66 /*
  67  * Returns the connectors currently associated with a CRTC.  This function
  68  * should be called twice:  once with a NULL connector list to retrieve
  69  * the list size, and once with the properly allocated list to be filled in.
  70  */
  71 static int get_connectors_for_crtc(struct drm_crtc *crtc,
  72                                    struct drm_connector **connector_list,
  73                                    int num_connectors)
  74 {
  75         struct drm_device *dev = crtc->dev;
  76         struct drm_connector *connector;
  77         int count = 0;
  78
  79         /*
  80          * Note: Once we change the plane hooks to more fine-grained locking we
  81          * need to grab the connection_mutex here to be able to make these
  82          * checks.
  83          */
  84         WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
  85
  86         drm_for_each_connector(connector, dev) {
  87                 if (connector->encoder && connector->encoder->crtc == crtc) {
  88                         if (connector_list != NULL && count < num_connectors)
  89                                 *(connector_list++) = connector;
  90
  91                         count++;
  92                 }
  93         }
  94
  95         return count;
  96 }
  97
  98 /**
  99  * drm_plane_helper_check_state() - Check plane state for validity
 100  * @state: plane state to check
 101  * @clip: integer clipping coordinates
 102  * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
 103  * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
 104  * @can_position: is it legal to position the plane such that it
 105  *                doesn't cover the entire crtc?  This will generally
 106  *                only be false for primary planes.
 107  * @can_update_disabled: can the plane be updated while the crtc
 108  *                       is disabled?
 109  *
 110  * Checks that a desired plane update is valid, and updates various
 111  * bits of derived state (clipped coordinates etc.). Drivers that provide
 112  * their own plane handling rather than helper-provided implementations may
 113  * still wish to call this function to avoid duplication of error checking
 114  * code.
 115  *
 116  * RETURNS:
 117  * Zero if update appears valid, error code on failure
 118  */
 119 int drm_plane_helper_check_state(struct drm_plane_state *state,
 120                                  const struct drm_rect *clip,
 121                                  int min_scale,
 122                                  int max_scale,
 123                                  bool can_position,
 124                                  bool can_update_disabled)
 125 {
 126         struct drm_crtc *crtc = state->crtc;
 127         struct drm_framebuffer *fb = state->fb;
 128         struct drm_rect *src = &state->src;
 129         struct drm_rect *dst = &state->dst;
 130         unsigned int rotation = state->rotation;
 131         int hscale, vscale;
 132
 133         src->x1 = state->src_x;
 134         src->y1 = state->src_y;
 135         src->x2 = state->src_x + state->src_w;
 136         src->y2 = state->src_y + state->src_h;
 137
 138         dst->x1 = state->crtc_x;
 139         dst->y1 = state->crtc_y;
 140         dst->x2 = state->crtc_x + state->crtc_w;
 141         dst->y2 = state->crtc_y + state->crtc_h;
 142
 143         if (!fb) {
 144                 state->visible = false;
 145                 return 0;
 146         }
 147
 148         /* crtc should only be NULL when disabling (i.e., !fb) */
 149         if (WARN_ON(!crtc)) {
 150                 state->visible = false;
 151                 return 0;
 152         }
 153
 154         if (!crtc->enabled && !can_update_disabled) {
 155                 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
 156                 return -EINVAL;
 157         }
 158
 159         drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
 160
 161         /* Check scaling */
 162         hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
 163         vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
 164         if (hscale < 0 || vscale < 0) {
 165                 DRM_DEBUG_KMS("Invalid scaling of plane\n");
 166                 drm_rect_debug_print("src: ", &state->src, true);
 167                 drm_rect_debug_print("dst: ", &state->dst, false);
 168                 return -ERANGE;
 169         }
 170
 171         state->visible = drm_rect_clip_scaled(src, dst, clip, hscale, vscale);
 172
 173         drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
 174
 175         if (!state->visible)
 176                 /*
 177                  * Plane isn't visible; some drivers can handle this
 178                  * so we just return success here.  Drivers that can't
 179                  * (including those that use the primary plane helper's
 180                  * update function) will return an error from their
 181                  * update_plane handler.
 182                  */
 183                 return 0;
 184
 185         if (!can_position && !drm_rect_equals(dst, clip)) {
 186                 DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
 187                 drm_rect_debug_print("dst: ", dst, false);
 188                 drm_rect_debug_print("clip: ", clip, false);
 189                 return -EINVAL;
 190         }
 191
 192         return 0;
 193 }
 194 EXPORT_SYMBOL(drm_plane_helper_check_state);
 195
 196 /**
 197  * drm_plane_helper_check_update() - Check plane update for validity
 198  * @plane: plane object to update
 199  * @crtc: owning CRTC of owning plane
 200  * @fb: framebuffer to flip onto plane
 201  * @src: source coordinates in 16.16 fixed point
 202  * @dst: integer destination coordinates
 203  * @clip: integer clipping coordinates
 204  * @rotation: plane rotation
 205  * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
 206  * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
 207  * @can_position: is it legal to position the plane such that it
 208  *                doesn't cover the entire crtc?  This will generally
 209  *                only be false for primary planes.
 210  * @can_update_disabled: can the plane be updated while the crtc
 211  *                       is disabled?
 212  * @visible: output parameter indicating whether plane is still visible after
 213  *           clipping
 214  *
 215  * Checks that a desired plane update is valid.  Drivers that provide
 216  * their own plane handling rather than helper-provided implementations may
 217  * still wish to call this function to avoid duplication of error checking
 218  * code.
 219  *
 220  * RETURNS:
 221  * Zero if update appears valid, error code on failure
 222  */
 223 int drm_plane_helper_check_update(struct drm_plane *plane,
 224                                   struct drm_crtc *crtc,
 225                                   struct drm_framebuffer *fb,
 226                                   struct drm_rect *src,
 227                                   struct drm_rect *dst,
 228                                   const struct drm_rect *clip,
 229                                   unsigned int rotation,
 230                                   int min_scale,
 231                                   int max_scale,
 232                                   bool can_position,
 233                                   bool can_update_disabled,
 234                                   bool *visible)
 235 {
 236         struct drm_plane_state state = {
 237                 .plane = plane,
 238                 .crtc = crtc,
 239                 .fb = fb,
 240                 .src_x = src->x1,
 241                 .src_y = src->y1,
 242                 .src_w = drm_rect_width(src),
 243                 .src_h = drm_rect_height(src),
 244                 .crtc_x = dst->x1,
 245                 .crtc_y = dst->y1,
 246                 .crtc_w = drm_rect_width(dst),
 247                 .crtc_h = drm_rect_height(dst),
 248                 .rotation = rotation,
 249                 .visible = *visible,
 250         };
 251         int ret;
 252
 253         ret = drm_plane_helper_check_state(&state, clip,
 254                                            min_scale, max_scale,
 255                                            can_position,
 256                                            can_update_disabled);
 257         if (ret)
 258                 return ret;
 259
 260         *src = state.src;
 261         *dst = state.dst;
 262         *visible = state.visible;
 263
 264         return 0;
 265 }
 266 EXPORT_SYMBOL(drm_plane_helper_check_update);
 267
 268 /**
 269  * drm_primary_helper_update() - Helper for primary plane update
 270  * @plane: plane object to update
 271  * @crtc: owning CRTC of owning plane
 272  * @fb: framebuffer to flip onto plane
 273  * @crtc_x: x offset of primary plane on crtc
 274  * @crtc_y: y offset of primary plane on crtc
 275  * @crtc_w: width of primary plane rectangle on crtc
 276  * @crtc_h: height of primary plane rectangle on crtc
 277  * @src_x: x offset of @fb for panning
 278  * @src_y: y offset of @fb for panning
 279  * @src_w: width of source rectangle in @fb
 280  * @src_h: height of source rectangle in @fb
 281  *
 282  * Provides a default plane update handler for primary planes.  This is handler
 283  * is called in response to a userspace SetPlane operation on the plane with a
 284  * non-NULL framebuffer.  We call the driver's modeset handler to update the
 285  * framebuffer.
 286  *
 287  * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
 288  * return an error.
 289  *
 290  * Note that we make some assumptions about hardware limitations that may not be
 291  * true for all hardware --
 292  *
 293  * 1. Primary plane cannot be repositioned.
 294  * 2. Primary plane cannot be scaled.
 295  * 3. Primary plane must cover the entire CRTC.
 296  * 4. Subpixel positioning is not supported.
 297  *
 298  * Drivers for hardware that don't have these restrictions can provide their
 299  * own implementation rather than using this helper.
 300  *
 301  * RETURNS:
 302  * Zero on success, error code on failure
 303  */
 304 int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
 305                               struct drm_framebuffer *fb,
 306                               int crtc_x, int crtc_y,
 307                               unsigned int crtc_w, unsigned int crtc_h,
 308                               uint32_t src_x, uint32_t src_y,
 309                               uint32_t src_w, uint32_t src_h)
 310 {
 311         struct drm_mode_set set = {
 312                 .crtc = crtc,
 313                 .fb = fb,
 314                 .mode = &crtc->mode,
 315                 .x = src_x >> 16,
 316                 .y = src_y >> 16,
 317         };
 318         struct drm_rect src = {
 319                 .x1 = src_x,
 320                 .y1 = src_y,
 321                 .x2 = src_x + src_w,
 322                 .y2 = src_y + src_h,
 323         };
 324         struct drm_rect dest = {
 325                 .x1 = crtc_x,
 326                 .y1 = crtc_y,
 327                 .x2 = crtc_x + crtc_w,
 328                 .y2 = crtc_y + crtc_h,
 329         };
 330         const struct drm_rect clip = {
 331                 .x2 = crtc->mode.hdisplay,
 332                 .y2 = crtc->mode.vdisplay,
 333         };
 334         struct drm_connector **connector_list;
 335         int num_connectors, ret;
 336         bool visible;
 337
 338         ret = drm_plane_helper_check_update(plane, crtc, fb,
 339                                             &src, &dest, &clip,
 340                                             DRM_ROTATE_0,
 341                                             DRM_PLANE_HELPER_NO_SCALING,
 342                                             DRM_PLANE_HELPER_NO_SCALING,
 343                                             false, false, &visible);
 344         if (ret)
 345                 return ret;
 346
 347         if (!visible)
 348                 /*
 349                  * Primary plane isn't visible.  Note that unless a driver
 350                  * provides their own disable function, this will just
 351                  * wind up returning -EINVAL to userspace.
 352                  */
 353                 return plane->funcs->disable_plane(plane);
 354
 355         /* Find current connectors for CRTC */
 356         num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
 357         BUG_ON(num_connectors == 0);
 358         connector_list = kzalloc(num_connectors * sizeof(*connector_list),
 359                                  GFP_KERNEL);
 360         if (!connector_list)
 361                 return -ENOMEM;
 362         get_connectors_for_crtc(crtc, connector_list, num_connectors);
 363
 364         set.connectors = connector_list;
 365         set.num_connectors = num_connectors;
 366
 367         /*
 368          * We call set_config() directly here rather than using
 369          * drm_mode_set_config_internal.  We're reprogramming the same
 370          * connectors that were already in use, so we shouldn't need the extra
 371          * cross-CRTC fb refcounting to accomodate stealing connectors.
 372          * drm_mode_setplane() already handles the basic refcounting for the
 373          * framebuffers involved in this operation.
 374          */
 375         ret = crtc->funcs->set_config(&set);
 376
 377         kfree(connector_list);
 378         return ret;
 379 }
 380 EXPORT_SYMBOL(drm_primary_helper_update);
 381
 382 /**
 383  * drm_primary_helper_disable() - Helper for primary plane disable
 384  * @plane: plane to disable
 385  *
 386  * Provides a default plane disable handler for primary planes.  This is handler
 387  * is called in response to a userspace SetPlane operation on the plane with a
 388  * NULL framebuffer parameter.  It unconditionally fails the disable call with
 389  * -EINVAL the only way to disable the primary plane without driver support is
 390  * to disable the entier CRTC. Which does not match the plane ->disable hook.
 391  *
 392  * Note that some hardware may be able to disable the primary plane without
 393  * disabling the whole CRTC.  Drivers for such hardware should provide their
 394  * own disable handler that disables just the primary plane (and they'll likely
 395  * need to provide their own update handler as well to properly re-enable a
 396  * disabled primary plane).
 397  *
 398  * RETURNS:
 399  * Unconditionally returns -EINVAL.
 400  */
 401 int drm_primary_helper_disable(struct drm_plane *plane)
 402 {
 403         return -EINVAL;
 404 }
 405 EXPORT_SYMBOL(drm_primary_helper_disable);
 406
 407 /**
 408  * drm_primary_helper_destroy() - Helper for primary plane destruction
 409  * @plane: plane to destroy
 410  *
 411  * Provides a default plane destroy handler for primary planes.  This handler
 412  * is called during CRTC destruction.  We disable the primary plane, remove
 413  * it from the DRM plane list, and deallocate the plane structure.
 414  */
 415 void drm_primary_helper_destroy(struct drm_plane *plane)
 416 {
 417         drm_plane_cleanup(plane);
 418         kfree(plane);
 419 }
 420 EXPORT_SYMBOL(drm_primary_helper_destroy);
 421
 422 const struct drm_plane_funcs drm_primary_helper_funcs = {
 423         .update_plane = drm_primary_helper_update,
 424         .disable_plane = drm_primary_helper_disable,
 425         .destroy = drm_primary_helper_destroy,
 426 };
 427 EXPORT_SYMBOL(drm_primary_helper_funcs);
 428
 429 int drm_plane_helper_commit(struct drm_plane *plane,
 430                             struct drm_plane_state *plane_state,
 431                             struct drm_framebuffer *old_fb)
 432 {
 433         const struct drm_plane_helper_funcs *plane_funcs;
 434         struct drm_crtc *crtc[2];
 435         const struct drm_crtc_helper_funcs *crtc_funcs[2];
 436         int i, ret = 0;
 437
 438         plane_funcs = plane->helper_private;
 439
 440         /* Since this is a transitional helper we can't assume that plane->state
 441          * is always valid. Hence we need to use plane->crtc instead of
 442          * plane->state->crtc as the old crtc. */
 443         crtc[0] = plane->crtc;
 444         crtc[1] = crtc[0] != plane_state->crtc ? plane_state->crtc : NULL;
 445
 446         for (i = 0; i < 2; i++)
 447                 crtc_funcs[i] = crtc[i] ? crtc[i]->helper_private : NULL;
 448
 449         if (plane_funcs->atomic_check) {
 450                 ret = plane_funcs->atomic_check(plane, plane_state);
 451                 if (ret)
 452                         goto out;
 453         }
 454
 455         if (plane_funcs->prepare_fb && plane_state->fb &&
 456             plane_state->fb != old_fb) {
 457                 ret = plane_funcs->prepare_fb(plane,
 458                                               plane_state);
 459                 if (ret)
 460                         goto out;
 461         }
 462
 463         /* Point of no return, commit sw state. */
 464         swap(plane->state, plane_state);
 465
 466         for (i = 0; i < 2; i++) {
 467                 if (crtc_funcs[i] && crtc_funcs[i]->atomic_begin)
 468                         crtc_funcs[i]->atomic_begin(crtc[i], crtc[i]->state);
 469         }
 470
 471         /*
 472          * Drivers may optionally implement the ->atomic_disable callback, so
 473          * special-case that here.
 474          */
 475         if (drm_atomic_plane_disabling(plane, plane_state) &&
 476             plane_funcs->atomic_disable)
 477                 plane_funcs->atomic_disable(plane, plane_state);
 478         else
 479                 plane_funcs->atomic_update(plane, plane_state);
 480
 481         for (i = 0; i < 2; i++) {
 482                 if (crtc_funcs[i] && crtc_funcs[i]->atomic_flush)
 483                         crtc_funcs[i]->atomic_flush(crtc[i], crtc[i]->state);
 484         }
 485
 486         /*
 487          * If we only moved the plane and didn't change fb's, there's no need to
 488          * wait for vblank.
 489          */
 490         if (plane->state->fb == old_fb)
 491                 goto out;
 492
 493         for (i = 0; i < 2; i++) {
 494                 if (!crtc[i])
 495                         continue;
 496
 497                 if (crtc[i]->cursor == plane)
 498                         continue;
 499
 500                 /* There's no other way to figure out whether the crtc is running. */
 501                 ret = drm_crtc_vblank_get(crtc[i]);
 502                 if (ret == 0) {
 503                         drm_crtc_wait_one_vblank(crtc[i]);
 504                         drm_crtc_vblank_put(crtc[i]);
 505                 }
 506
 507                 ret = 0;
 508         }
 509
 510         if (plane_funcs->cleanup_fb)
 511                 plane_funcs->cleanup_fb(plane, plane_state);
 512 out:
 513         if (plane_state) {
 514                 if (plane->funcs->atomic_destroy_state)
 515                         plane->funcs->atomic_destroy_state(plane, plane_state);
 516                 else
 517                         drm_atomic_helper_plane_destroy_state(plane, plane_state);
 518         }
 519
 520         return ret;
 521 }
 522
 523 /**
 524  * drm_plane_helper_update() - Transitional helper for plane update
 525  * @plane: plane object to update
 526  * @crtc: owning CRTC of owning plane
 527  * @fb: framebuffer to flip onto plane
 528  * @crtc_x: x offset of primary plane on crtc
 529  * @crtc_y: y offset of primary plane on crtc
 530  * @crtc_w: width of primary plane rectangle on crtc
 531  * @crtc_h: height of primary plane rectangle on crtc
 532  * @src_x: x offset of @fb for panning
 533  * @src_y: y offset of @fb for panning
 534  * @src_w: width of source rectangle in @fb
 535  * @src_h: height of source rectangle in @fb
 536  *
 537  * Provides a default plane update handler using the atomic plane update
 538  * functions. It is fully left to the driver to check plane constraints and
 539  * handle corner-cases like a fully occluded or otherwise invisible plane.
 540  *
 541  * This is useful for piecewise transitioning of a driver to the atomic helpers.
 542  *
 543  * RETURNS:
 544  * Zero on success, error code on failure
 545  */
 546 int drm_plane_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
 547                             struct drm_framebuffer *fb,
 548                             int crtc_x, int crtc_y,
 549                             unsigned int crtc_w, unsigned int crtc_h,
 550                             uint32_t src_x, uint32_t src_y,
 551                             uint32_t src_w, uint32_t src_h)
 552 {
 553         struct drm_plane_state *plane_state;
 554
 555         if (plane->funcs->atomic_duplicate_state)
 556                 plane_state = plane->funcs->atomic_duplicate_state(plane);
 557         else {
 558                 if (!plane->state)
 559                         drm_atomic_helper_plane_reset(plane);
 560
 561                 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
 562         }
 563         if (!plane_state)
 564                 return -ENOMEM;
 565         plane_state->plane = plane;
 566
 567         plane_state->crtc = crtc;
 568         drm_atomic_set_fb_for_plane(plane_state, fb);
 569         plane_state->crtc_x = crtc_x;
 570         plane_state->crtc_y = crtc_y;
 571         plane_state->crtc_h = crtc_h;
 572         plane_state->crtc_w = crtc_w;
 573         plane_state->src_x = src_x;
 574         plane_state->src_y = src_y;
 575         plane_state->src_h = src_h;
 576         plane_state->src_w = src_w;
 577
 578         return drm_plane_helper_commit(plane, plane_state, plane->fb);
 579 }
 580 EXPORT_SYMBOL(drm_plane_helper_update);
 581
 582 /**
 583  * drm_plane_helper_disable() - Transitional helper for plane disable
 584  * @plane: plane to disable
 585  *
 586  * Provides a default plane disable handler using the atomic plane update
 587  * functions. It is fully left to the driver to check plane constraints and
 588  * handle corner-cases like a fully occluded or otherwise invisible plane.
 589  *
 590  * This is useful for piecewise transitioning of a driver to the atomic helpers.
 591  *
 592  * RETURNS:
 593  * Zero on success, error code on failure
 594  */
 595 int drm_plane_helper_disable(struct drm_plane *plane)
 596 {
 597         struct drm_plane_state *plane_state;
 598
 599         /* crtc helpers love to call disable functions for already disabled hw
 600          * functions. So cope with that. */
 601         if (!plane->crtc)
 602                 return 0;
 603
 604         if (plane->funcs->atomic_duplicate_state)
 605                 plane_state = plane->funcs->atomic_duplicate_state(plane);
 606         else {
 607                 if (!plane->state)
 608                         drm_atomic_helper_plane_reset(plane);
 609
 610                 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
 611         }
 612         if (!plane_state)
 613                 return -ENOMEM;
 614         plane_state->plane = plane;
 615
 616         plane_state->crtc = NULL;
 617         drm_atomic_set_fb_for_plane(plane_state, NULL);
 618
 619         return drm_plane_helper_commit(plane, plane_state, plane->fb);
 620 }
 621 EXPORT_SYMBOL(drm_plane_helper_disable);