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_encoder.h>
  33 #include <drm/drm_atomic_helper.h>
  34
  35 #define SUBPIXEL_MASK 0xffff
  36
  37 /**
  38  * DOC: overview
  39  *
  40  * This helper library has two parts. The first part has support to implement
  41  * primary plane support on top of the normal CRTC configuration interface.
  42  * Since the legacy &drm_mode_config_funcs.set_config interface ties the primary
  43  * plane together with the CRTC state this does not allow userspace to disable
  44  * the primary plane itself.  To avoid too much duplicated code use
  45  * drm_plane_helper_check_update() which can be used to enforce the same
  46  * restrictions as primary planes had thus. The default primary plane only
  47  * expose XRBG8888 and ARGB8888 as valid pixel formats for the attached
  48  * framebuffer.
  49  *
  50  * Drivers are highly recommended to implement proper support for primary
  51  * planes, and newly merged drivers must not rely upon these transitional
  52  * helpers.
  53  *
  54  * The second part also implements transitional helpers which allow drivers to
  55  * gradually switch to the atomic helper infrastructure for plane updates. Once
  56  * that switch is complete drivers shouldn't use these any longer, instead using
  57  * the proper legacy implementations for update and disable plane hooks provided
  58  * by the atomic helpers.
  59  *
  60  * Again drivers are strongly urged to switch to the new interfaces.
  61  *
  62  * The plane helpers share the function table structures with other helpers,
  63  * specifically also the atomic helpers. See &struct drm_plane_helper_funcs for
  64  * the details.
  65  */
  66
  67 /*
  68  * Returns the connectors currently associated with a CRTC.  This function
  69  * should be called twice:  once with a NULL connector list to retrieve
  70  * the list size, and once with the properly allocated list to be filled in.
  71  */
  72 static int get_connectors_for_crtc(struct drm_crtc *crtc,
  73                                    struct drm_connector **connector_list,
  74                                    int num_connectors)
  75 {
  76         struct drm_device *dev = crtc->dev;
  77         struct drm_connector *connector;
  78         struct drm_connector_list_iter conn_iter;
  79         int count = 0;
  80
  81         /*
  82          * Note: Once we change the plane hooks to more fine-grained locking we
  83          * need to grab the connection_mutex here to be able to make these
  84          * checks.
  85          */
  86         WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
  87
  88         drm_connector_list_iter_begin(dev, &conn_iter);
  89         drm_for_each_connector_iter(connector, &conn_iter) {
  90                 if (connector->encoder && connector->encoder->crtc == crtc) {
  91                         if (connector_list != NULL && count < num_connectors)
  92                                 *(connector_list++) = connector;
  93
  94                         count++;
  95                 }
  96         }
  97         drm_connector_list_iter_end(&conn_iter);
  98
  99         return count;
 100 }
 101
 102 /**
 103  * drm_plane_helper_check_state() - Check plane state for validity
 104  * @state: plane state to check
 105  * @clip: integer clipping coordinates
 106  * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
 107  * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
 108  * @can_position: is it legal to position the plane such that it
 109  *                doesn't cover the entire crtc?  This will generally
 110  *                only be false for primary planes.
 111  * @can_update_disabled: can the plane be updated while the crtc
 112  *                       is disabled?
 113  *
 114  * Checks that a desired plane update is valid, and updates various
 115  * bits of derived state (clipped coordinates etc.). Drivers that provide
 116  * their own plane handling rather than helper-provided implementations may
 117  * still wish to call this function to avoid duplication of error checking
 118  * code.
 119  *
 120  * RETURNS:
 121  * Zero if update appears valid, error code on failure
 122  */
 123 int drm_plane_helper_check_state(struct drm_plane_state *state,
 124                                  const struct drm_rect *clip,
 125                                  int min_scale,
 126                                  int max_scale,
 127                                  bool can_position,
 128                                  bool can_update_disabled)
 129 {
 130         struct drm_crtc *crtc = state->crtc;
 131         struct drm_framebuffer *fb = state->fb;
 132         struct drm_rect *src = &state->src;
 133         struct drm_rect *dst = &state->dst;
 134         unsigned int rotation = state->rotation;
 135         int hscale, vscale;
 136
 137         *src = drm_plane_state_src(state);
 138         *dst = drm_plane_state_dest(state);
 139
 140         if (!fb) {
 141                 state->visible = false;
 142                 return 0;
 143         }
 144
 145         /* crtc should only be NULL when disabling (i.e., !fb) */
 146         if (WARN_ON(!crtc)) {
 147                 state->visible = false;
 148                 return 0;
 149         }
 150
 151         if (!crtc->enabled && !can_update_disabled) {
 152                 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
 153                 return -EINVAL;
 154         }
 155
 156         drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
 157
 158         /* Check scaling */
 159         hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
 160         vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
 161         if (hscale < 0 || vscale < 0) {
 162                 DRM_DEBUG_KMS("Invalid scaling of plane\n");
 163                 drm_rect_debug_print("src: ", &state->src, true);
 164                 drm_rect_debug_print("dst: ", &state->dst, false);
 165                 return -ERANGE;
 166         }
 167
 168         state->visible = drm_rect_clip_scaled(src, dst, clip, hscale, vscale);
 169
 170         drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
 171
 172         if (!state->visible)
 173                 /*
 174                  * Plane isn't visible; some drivers can handle this
 175                  * so we just return success here.  Drivers that can't
 176                  * (including those that use the primary plane helper's
 177                  * update function) will return an error from their
 178                  * update_plane handler.
 179                  */
 180                 return 0;
 181
 182         if (!can_position && !drm_rect_equals(dst, clip)) {
 183                 DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
 184                 drm_rect_debug_print("dst: ", dst, false);
 185                 drm_rect_debug_print("clip: ", clip, false);
 186                 return -EINVAL;
 187         }
 188
 189         return 0;
 190 }
 191 EXPORT_SYMBOL(drm_plane_helper_check_state);
 192
 193 /**
 194  * drm_plane_helper_check_update() - Check plane update for validity
 195  * @plane: plane object to update
 196  * @crtc: owning CRTC of owning plane
 197  * @fb: framebuffer to flip onto plane
 198  * @src: source coordinates in 16.16 fixed point
 199  * @dst: integer destination coordinates
 200  * @clip: integer clipping coordinates
 201  * @rotation: plane rotation
 202  * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
 203  * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
 204  * @can_position: is it legal to position the plane such that it
 205  *                doesn't cover the entire crtc?  This will generally
 206  *                only be false for primary planes.
 207  * @can_update_disabled: can the plane be updated while the crtc
 208  *                       is disabled?
 209  * @visible: output parameter indicating whether plane is still visible after
 210  *           clipping
 211  *
 212  * Checks that a desired plane update is valid.  Drivers that provide
 213  * their own plane handling rather than helper-provided implementations may
 214  * still wish to call this function to avoid duplication of error checking
 215  * code.
 216  *
 217  * RETURNS:
 218  * Zero if update appears valid, error code on failure
 219  */
 220 int drm_plane_helper_check_update(struct drm_plane *plane,
 221                                   struct drm_crtc *crtc,
 222                                   struct drm_framebuffer *fb,
 223                                   struct drm_rect *src,
 224                                   struct drm_rect *dst,
 225                                   const struct drm_rect *clip,
 226                                   unsigned int rotation,
 227                                   int min_scale,
 228                                   int max_scale,
 229                                   bool can_position,
 230                                   bool can_update_disabled,
 231                                   bool *visible)
 232 {
 233         struct drm_plane_state state = {
 234                 .plane = plane,
 235                 .crtc = crtc,
 236                 .fb = fb,
 237                 .src_x = src->x1,
 238                 .src_y = src->y1,
 239                 .src_w = drm_rect_width(src),
 240                 .src_h = drm_rect_height(src),
 241                 .crtc_x = dst->x1,
 242                 .crtc_y = dst->y1,
 243                 .crtc_w = drm_rect_width(dst),
 244                 .crtc_h = drm_rect_height(dst),
 245                 .rotation = rotation,
 246                 .visible = *visible,
 247         };
 248         int ret;
 249
 250         ret = drm_plane_helper_check_state(&state, clip,
 251                                            min_scale, max_scale,
 252                                            can_position,
 253                                            can_update_disabled);
 254         if (ret)
 255                 return ret;
 256
 257         *src = state.src;
 258         *dst = state.dst;
 259         *visible = state.visible;
 260
 261         return 0;
 262 }
 263 EXPORT_SYMBOL(drm_plane_helper_check_update);
 264
 265 /**
 266  * drm_primary_helper_update() - Helper for primary plane update
 267  * @plane: plane object to update
 268  * @crtc: owning CRTC of owning plane
 269  * @fb: framebuffer to flip onto plane
 270  * @crtc_x: x offset of primary plane on crtc
 271  * @crtc_y: y offset of primary plane on crtc
 272  * @crtc_w: width of primary plane rectangle on crtc
 273  * @crtc_h: height of primary plane rectangle on crtc
 274  * @src_x: x offset of @fb for panning
 275  * @src_y: y offset of @fb for panning
 276  * @src_w: width of source rectangle in @fb
 277  * @src_h: height of source rectangle in @fb
 278  * @ctx: lock acquire context, not used here
 279  *
 280  * Provides a default plane update handler for primary planes.  This is handler
 281  * is called in response to a userspace SetPlane operation on the plane with a
 282  * non-NULL framebuffer.  We call the driver's modeset handler to update the
 283  * framebuffer.
 284  *
 285  * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
 286  * return an error.
 287  *
 288  * Note that we make some assumptions about hardware limitations that may not be
 289  * true for all hardware --
 290  *
 291  * 1. Primary plane cannot be repositioned.
 292  * 2. Primary plane cannot be scaled.
 293  * 3. Primary plane must cover the entire CRTC.
 294  * 4. Subpixel positioning is not supported.
 295  *
 296  * Drivers for hardware that don't have these restrictions can provide their
 297  * own implementation rather than using this helper.
 298  *
 299  * RETURNS:
 300  * Zero on success, error code on failure
 301  */
 302 int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
 303                               struct drm_framebuffer *fb,
 304                               int crtc_x, int crtc_y,
 305                               unsigned int crtc_w, unsigned int crtc_h,
 306                               uint32_t src_x, uint32_t src_y,
 307                               uint32_t src_w, uint32_t src_h,
 308                               struct drm_modeset_acquire_ctx *ctx)
 309 {
 310         struct drm_mode_set set = {
 311                 .crtc = crtc,
 312                 .fb = fb,
 313                 .mode = &crtc->mode,
 314                 .x = src_x >> 16,
 315                 .y = src_y >> 16,
 316         };
 317         struct drm_rect src = {
 318                 .x1 = src_x,
 319                 .y1 = src_y,
 320                 .x2 = src_x + src_w,
 321                 .y2 = src_y + src_h,
 322         };
 323         struct drm_rect dest = {
 324                 .x1 = crtc_x,
 325                 .y1 = crtc_y,
 326                 .x2 = crtc_x + crtc_w,
 327                 .y2 = crtc_y + crtc_h,
 328         };
 329         const struct drm_rect clip = {
 330                 .x2 = crtc->mode.hdisplay,
 331                 .y2 = crtc->mode.vdisplay,
 332         };
 333         struct drm_connector **connector_list;
 334         int num_connectors, ret;
 335         bool visible;
 336
 337         ret = drm_plane_helper_check_update(plane, crtc, fb,
 338                                             &src, &dest, &clip,
 339                                             DRM_MODE_ROTATE_0,
 340                                             DRM_PLANE_HELPER_NO_SCALING,
 341                                             DRM_PLANE_HELPER_NO_SCALING,
 342                                             false, false, &visible);
 343         if (ret)
 344                 return ret;
 345
 346         if (!visible)
 347                 /*
 348                  * Primary plane isn't visible.  Note that unless a driver
 349                  * provides their own disable function, this will just
 350                  * wind up returning -EINVAL to userspace.
 351                  */
 352                 return plane->funcs->disable_plane(plane, ctx);
 353
 354         /* Find current connectors for CRTC */
 355         num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
 356         BUG_ON(num_connectors == 0);
 357         connector_list = kzalloc(num_connectors * sizeof(*connector_list),
 358                                  GFP_KERNEL);
 359         if (!connector_list)
 360                 return -ENOMEM;
 361         get_connectors_for_crtc(crtc, connector_list, num_connectors);
 362
 363         set.connectors = connector_list;
 364         set.num_connectors = num_connectors;
 365
 366         /*
 367          * We call set_config() directly here rather than using
 368          * drm_mode_set_config_internal.  We're reprogramming the same
 369          * connectors that were already in use, so we shouldn't need the extra
 370          * cross-CRTC fb refcounting to accomodate stealing connectors.
 371          * drm_mode_setplane() already handles the basic refcounting for the
 372          * framebuffers involved in this operation.
 373          */
 374         ret = crtc->funcs->set_config(&set, ctx);
 375
 376         kfree(connector_list);
 377         return ret;
 378 }
 379 EXPORT_SYMBOL(drm_primary_helper_update);
 380
 381 /**
 382  * drm_primary_helper_disable() - Helper for primary plane disable
 383  * @plane: plane to disable
 384  * @ctx: lock acquire context, not used here
 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 entire CRTC. Which does not match the plane
 391  * &drm_plane_funcs.disable_plane hook.
 392  *
 393  * Note that some hardware may be able to disable the primary plane without
 394  * disabling the whole CRTC.  Drivers for such hardware should provide their
 395  * own disable handler that disables just the primary plane (and they'll likely
 396  * need to provide their own update handler as well to properly re-enable a
 397  * disabled primary plane).
 398  *
 399  * RETURNS:
 400  * Unconditionally returns -EINVAL.
 401  */
 402 int drm_primary_helper_disable(struct drm_plane *plane,
 403                                struct drm_modeset_acquire_ctx *ctx)
 404 {
 405         return -EINVAL;
 406 }
 407 EXPORT_SYMBOL(drm_primary_helper_disable);
 408
 409 /**
 410  * drm_primary_helper_destroy() - Helper for primary plane destruction
 411  * @plane: plane to destroy
 412  *
 413  * Provides a default plane destroy handler for primary planes.  This handler
 414  * is called during CRTC destruction.  We disable the primary plane, remove
 415  * it from the DRM plane list, and deallocate the plane structure.
 416  */
 417 void drm_primary_helper_destroy(struct drm_plane *plane)
 418 {
 419         drm_plane_cleanup(plane);
 420         kfree(plane);
 421 }
 422 EXPORT_SYMBOL(drm_primary_helper_destroy);
 423
 424 const struct drm_plane_funcs drm_primary_helper_funcs = {
 425         .update_plane = drm_primary_helper_update,
 426         .disable_plane = drm_primary_helper_disable,
 427         .destroy = drm_primary_helper_destroy,
 428 };
 429 EXPORT_SYMBOL(drm_primary_helper_funcs);
 430
 431 int drm_plane_helper_commit(struct drm_plane *plane,
 432                             struct drm_plane_state *plane_state,
 433                             struct drm_framebuffer *old_fb)
 434 {
 435         const struct drm_plane_helper_funcs *plane_funcs;
 436         struct drm_crtc *crtc[2];
 437         const struct drm_crtc_helper_funcs *crtc_funcs[2];
 438         int i, ret = 0;
 439
 440         plane_funcs = plane->helper_private;
 441
 442         /* Since this is a transitional helper we can't assume that plane->state
 443          * is always valid. Hence we need to use plane->crtc instead of
 444          * plane->state->crtc as the old crtc. */
 445         crtc[0] = plane->crtc;
 446         crtc[1] = crtc[0] != plane_state->crtc ? plane_state->crtc : NULL;
 447
 448         for (i = 0; i < 2; i++)
 449                 crtc_funcs[i] = crtc[i] ? crtc[i]->helper_private : NULL;
 450
 451         if (plane_funcs->atomic_check) {
 452                 ret = plane_funcs->atomic_check(plane, plane_state);
 453                 if (ret)
 454                         goto out;
 455         }
 456
 457         if (plane_funcs->prepare_fb && plane_state->fb != old_fb) {
 458                 ret = plane_funcs->prepare_fb(plane,
 459                                               plane_state);
 460                 if (ret)
 461                         goto out;
 462         }
 463
 464         /* Point of no return, commit sw state. */
 465         swap(plane->state, plane_state);
 466
 467         for (i = 0; i < 2; i++) {
 468                 if (crtc_funcs[i] && crtc_funcs[i]->atomic_begin)
 469                         crtc_funcs[i]->atomic_begin(crtc[i], crtc[i]->state);
 470         }
 471
 472         /*
 473          * Drivers may optionally implement the ->atomic_disable callback, so
 474          * special-case that here.
 475          */
 476         if (drm_atomic_plane_disabling(plane_state, plane->state) &&
 477             plane_funcs->atomic_disable)
 478                 plane_funcs->atomic_disable(plane, plane_state);
 479         else
 480                 plane_funcs->atomic_update(plane, plane_state);
 481
 482         for (i = 0; i < 2; i++) {
 483                 if (crtc_funcs[i] && crtc_funcs[i]->atomic_flush)
 484                         crtc_funcs[i]->atomic_flush(crtc[i], crtc[i]->state);
 485         }
 486
 487         /*
 488          * If we only moved the plane and didn't change fb's, there's no need to
 489          * wait for vblank.
 490          */
 491         if (plane->state->fb == old_fb)
 492                 goto out;
 493
 494         for (i = 0; i < 2; i++) {
 495                 if (!crtc[i])
 496                         continue;
 497
 498                 if (crtc[i]->cursor == plane)
 499                         continue;
 500
 501                 /* There's no other way to figure out whether the crtc is running. */
 502                 ret = drm_crtc_vblank_get(crtc[i]);
 503                 if (ret == 0) {
 504                         drm_crtc_wait_one_vblank(crtc[i]);
 505                         drm_crtc_vblank_put(crtc[i]);
 506                 }
 507
 508                 ret = 0;
 509         }
 510
 511         if (plane_funcs->cleanup_fb)
 512                 plane_funcs->cleanup_fb(plane, plane_state);
 513 out:
 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         return ret;
 520 }
 521
 522 /**
 523  * drm_plane_helper_update() - Transitional helper for plane update
 524  * @plane: plane object to update
 525  * @crtc: owning CRTC of owning plane
 526  * @fb: framebuffer to flip onto plane
 527  * @crtc_x: x offset of primary plane on crtc
 528  * @crtc_y: y offset of primary plane on crtc
 529  * @crtc_w: width of primary plane rectangle on crtc
 530  * @crtc_h: height of primary plane rectangle on crtc
 531  * @src_x: x offset of @fb for panning
 532  * @src_y: y offset of @fb for panning
 533  * @src_w: width of source rectangle in @fb
 534  * @src_h: height of source rectangle in @fb
 535  *
 536  * Provides a default plane update handler using the atomic plane update
 537  * functions. It is fully left to the driver to check plane constraints and
 538  * handle corner-cases like a fully occluded or otherwise invisible plane.
 539  *
 540  * This is useful for piecewise transitioning of a driver to the atomic helpers.
 541  *
 542  * RETURNS:
 543  * Zero on success, error code on failure
 544  */
 545 int drm_plane_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
 546                             struct drm_framebuffer *fb,
 547                             int crtc_x, int crtc_y,
 548                             unsigned int crtc_w, unsigned int crtc_h,
 549                             uint32_t src_x, uint32_t src_y,
 550                             uint32_t src_w, uint32_t src_h)
 551 {
 552         struct drm_plane_state *plane_state;
 553
 554         if (plane->funcs->atomic_duplicate_state)
 555                 plane_state = plane->funcs->atomic_duplicate_state(plane);
 556         else {
 557                 if (!plane->state)
 558                         drm_atomic_helper_plane_reset(plane);
 559
 560                 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
 561         }
 562         if (!plane_state)
 563                 return -ENOMEM;
 564         plane_state->plane = plane;
 565
 566         plane_state->crtc = crtc;
 567         drm_atomic_set_fb_for_plane(plane_state, fb);
 568         plane_state->crtc_x = crtc_x;
 569         plane_state->crtc_y = crtc_y;
 570         plane_state->crtc_h = crtc_h;
 571         plane_state->crtc_w = crtc_w;
 572         plane_state->src_x = src_x;
 573         plane_state->src_y = src_y;
 574         plane_state->src_h = src_h;
 575         plane_state->src_w = src_w;
 576
 577         return drm_plane_helper_commit(plane, plane_state, plane->fb);
 578 }
 579 EXPORT_SYMBOL(drm_plane_helper_update);
 580
 581 /**
 582  * drm_plane_helper_disable() - Transitional helper for plane disable
 583  * @plane: plane to disable
 584  *
 585  * Provides a default plane disable handler using the atomic plane update
 586  * functions. It is fully left to the driver to check plane constraints and
 587  * handle corner-cases like a fully occluded or otherwise invisible plane.
 588  *
 589  * This is useful for piecewise transitioning of a driver to the atomic helpers.
 590  *
 591  * RETURNS:
 592  * Zero on success, error code on failure
 593  */
 594 int drm_plane_helper_disable(struct drm_plane *plane)
 595 {
 596         struct drm_plane_state *plane_state;
 597
 598         /* crtc helpers love to call disable functions for already disabled hw
 599          * functions. So cope with that. */
 600         if (!plane->crtc)
 601                 return 0;
 602
 603         if (plane->funcs->atomic_duplicate_state)
 604                 plane_state = plane->funcs->atomic_duplicate_state(plane);
 605         else {
 606                 if (!plane->state)
 607                         drm_atomic_helper_plane_reset(plane);
 608
 609                 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
 610         }
 611         if (!plane_state)
 612                 return -ENOMEM;
 613         plane_state->plane = plane;
 614
 615         plane_state->crtc = NULL;
 616         drm_atomic_set_fb_for_plane(plane_state, NULL);
 617
 618         return drm_plane_helper_commit(plane, plane_state, plane->fb);
 619 }
 620 EXPORT_SYMBOL(drm_plane_helper_disable);