1/*
2 * Copyright (C) 2016 Samsung Electronics Co.Ltd
3 * Authors:
4 * Marek Szyprowski <m.szyprowski@samsung.com>
5 *
6 * DRM core plane blending related functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 */
26
27#include <linux/export.h>
28#include <linux/slab.h>
29#include <linux/sort.h>
30
31#include <drm/drm_atomic.h>
32#include <drm/drm_blend.h>
33#include <drm/drm_device.h>
34#include <drm/drm_print.h>
35
36#include "drm_crtc_internal.h"
37
38/**
39 * DOC: overview
40 *
41 * The basic plane composition model supported by standard plane properties only
42 * has a source rectangle (in logical pixels within the &drm_framebuffer), with
43 * sub-pixel accuracy, which is scaled up to a pixel-aligned destination
44 * rectangle in the visible area of a &drm_crtc. The visible area of a CRTC is
45 * defined by the horizontal and vertical visible pixels (stored in @hdisplay
46 * and @vdisplay) of the requested mode (stored in &drm_crtc_state.mode). These
47 * two rectangles are both stored in the &drm_plane_state.
48 *
49 * For the atomic ioctl the following standard (atomic) properties on the plane object
50 * encode the basic plane composition model:
51 *
52 * SRC_X:
53 * X coordinate offset for the source rectangle within the
54 * &drm_framebuffer, in 16.16 fixed point. Must be positive.
55 * SRC_Y:
56 * Y coordinate offset for the source rectangle within the
57 * &drm_framebuffer, in 16.16 fixed point. Must be positive.
58 * SRC_W:
59 * Width for the source rectangle within the &drm_framebuffer, in 16.16
60 * fixed point. SRC_X plus SRC_W must be within the width of the source
61 * framebuffer. Must be positive.
62 * SRC_H:
63 * Height for the source rectangle within the &drm_framebuffer, in 16.16
64 * fixed point. SRC_Y plus SRC_H must be within the height of the source
65 * framebuffer. Must be positive.
66 * CRTC_X:
67 * X coordinate offset for the destination rectangle. Can be negative.
68 * CRTC_Y:
69 * Y coordinate offset for the destination rectangle. Can be negative.
70 * CRTC_W:
71 * Width for the destination rectangle. CRTC_X plus CRTC_W can extend past
72 * the currently visible horizontal area of the &drm_crtc.
73 * CRTC_H:
74 * Height for the destination rectangle. CRTC_Y plus CRTC_H can extend past
75 * the currently visible vertical area of the &drm_crtc.
76 * FB_ID:
77 * Mode object ID of the &drm_framebuffer this plane should scan out.
78 *
79 * When a KMS client is performing front-buffer rendering, it should set
80 * FB_ID to the same front-buffer FB on each atomic commit. This implies
81 * to the driver that it needs to re-read the same FB again. Otherwise
82 * drivers which do not employ continuously repeated scanout cycles might
83 * not update the screen.
84 * CRTC_ID:
85 * Mode object ID of the &drm_crtc this plane should be connected to.
86 *
87 * Note that the source rectangle must fully lie within the bounds of the
88 * &drm_framebuffer. The destination rectangle can lie outside of the visible
89 * area of the current mode of the CRTC. It must be appropriately clipped by the
90 * driver, which can be done by calling drm_plane_helper_check_update(). Drivers
91 * are also allowed to round the subpixel sampling positions appropriately, but
92 * only to the next full pixel. No pixel outside of the source rectangle may
93 * ever be sampled, which is important when applying more sophisticated
94 * filtering than just a bilinear one when scaling. The filtering mode when
95 * scaling is unspecified.
96 *
97 * On top of this basic transformation additional properties can be exposed by
98 * the driver:
99 *
100 * alpha:
101 * Alpha is setup with drm_plane_create_alpha_property(). It controls the
102 * plane-wide opacity, from transparent (0) to opaque (0xffff). It can be
103 * combined with pixel alpha.
104 * The pixel values in the framebuffers are expected to not be
105 * pre-multiplied by the global alpha associated to the plane.
106 *
107 * rotation:
108 * Rotation is set up with drm_plane_create_rotation_property(). It adds a
109 * rotation and reflection step between the source and destination rectangles.
110 * Without this property the rectangle is only scaled, but not rotated or
111 * reflected.
112 *
113 * Possbile values:
114 *
115 * "rotate-<degrees>":
116 * Signals that a drm plane is rotated <degrees> degrees in counter
117 * clockwise direction.
118 *
119 * "reflect-<axis>":
120 * Signals that the contents of a drm plane is reflected along the
121 * <axis> axis, in the same way as mirroring.
122 *
123 * reflect-x::
124 *
125 * |o | | o|
126 * | | -> | |
127 * | v| |v |
128 *
129 * reflect-y::
130 *
131 * |o | | ^|
132 * | | -> | |
133 * | v| |o |
134 *
135 * zpos:
136 * Z position is set up with drm_plane_create_zpos_immutable_property() and
137 * drm_plane_create_zpos_property(). It controls the visibility of overlapping
138 * planes. Without this property the primary plane is always below the cursor
139 * plane, and ordering between all other planes is undefined. The positive
140 * Z axis points towards the user, i.e. planes with lower Z position values
141 * are underneath planes with higher Z position values. Two planes with the
142 * same Z position value have undefined ordering. Note that the Z position
143 * value can also be immutable, to inform userspace about the hard-coded
144 * stacking of planes, see drm_plane_create_zpos_immutable_property(). If
145 * any plane has a zpos property (either mutable or immutable), then all
146 * planes shall have a zpos property.
147 *
148 * pixel blend mode:
149 * Pixel blend mode is set up with drm_plane_create_blend_mode_property().
150 * It adds a blend mode for alpha blending equation selection, describing
151 * how the pixels from the current plane are composited with the
152 * background.
153 *
154 * Three alpha blending equations are defined:
155 *
156 * "None":
157 * Blend formula that ignores the pixel alpha::
158 *
159 * out.rgb = plane_alpha * fg.rgb +
160 * (1 - plane_alpha) * bg.rgb
161 *
162 * "Pre-multiplied":
163 * Blend formula that assumes the pixel color values
164 * have been already pre-multiplied with the alpha
165 * channel values::
166 *
167 * out.rgb = plane_alpha * fg.rgb +
168 * (1 - (plane_alpha * fg.alpha)) * bg.rgb
169 *
170 * "Coverage":
171 * Blend formula that assumes the pixel color values have not
172 * been pre-multiplied and will do so when blending them to the
173 * background color values::
174 *
175 * out.rgb = plane_alpha * fg.alpha * fg.rgb +
176 * (1 - (plane_alpha * fg.alpha)) * bg.rgb
177 *
178 * Using the following symbols:
179 *
180 * "fg.rgb":
181 * Each of the RGB component values from the plane's pixel
182 * "fg.alpha":
183 * Alpha component value from the plane's pixel. If the plane's
184 * pixel format has no alpha component, then this is assumed to be
185 * 1.0. In these cases, this property has no effect, as all three
186 * equations become equivalent.
187 * "bg.rgb":
188 * Each of the RGB component values from the background
189 * "plane_alpha":
190 * Plane alpha value set by the plane "alpha" property. If the
191 * plane does not expose the "alpha" property, then this is
192 * assumed to be 1.0
193 *
194 * Note that all the property extensions described here apply either to the
195 * plane or the CRTC (e.g. for the background color, which currently is not
196 * exposed and assumed to be black).
197 *
198 * SCALING_FILTER:
199 * Indicates scaling filter to be used for plane scaler
200 *
201 * The value of this property can be one of the following:
202 *
203 * Default:
204 * Driver's default scaling filter
205 * Nearest Neighbor:
206 * Nearest Neighbor scaling filter
207 *
208 * Drivers can set up this property for a plane by calling
209 * drm_plane_create_scaling_filter_property
210 */
211
212/**
213 * drm_plane_create_alpha_property - create a new alpha property
214 * @plane: drm plane
215 *
216 * This function creates a generic, mutable, alpha property and enables support
217 * for it in the DRM core. It is attached to @plane.
218 *
219 * The alpha property will be allowed to be within the bounds of 0
220 * (transparent) to 0xffff (opaque).
221 *
222 * Returns:
223 * 0 on success, negative error code on failure.
224 */
225int drm_plane_create_alpha_property(struct drm_plane *plane)
226{
227 struct drm_property *prop;
228
229 prop = drm_property_create_range(dev: plane->dev, flags: 0, name: "alpha",
230 min: 0, DRM_BLEND_ALPHA_OPAQUE);
231 if (!prop)
232 return -ENOMEM;
233
234 drm_object_attach_property(obj: &plane->base, property: prop, DRM_BLEND_ALPHA_OPAQUE);
235 plane->alpha_property = prop;
236
237 if (plane->state)
238 plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE;
239
240 return 0;
241}
242EXPORT_SYMBOL(drm_plane_create_alpha_property);
243
244/**
245 * drm_plane_create_rotation_property - create a new rotation property
246 * @plane: drm plane
247 * @rotation: initial value of the rotation property
248 * @supported_rotations: bitmask of supported rotations and reflections
249 *
250 * This creates a new property with the selected support for transformations.
251 *
252 * Since a rotation by 180° degress is the same as reflecting both along the x
253 * and the y axis the rotation property is somewhat redundant. Drivers can use
254 * drm_rotation_simplify() to normalize values of this property.
255 *
256 * The property exposed to userspace is a bitmask property (see
257 * drm_property_create_bitmask()) called "rotation" and has the following
258 * bitmask enumaration values:
259 *
260 * DRM_MODE_ROTATE_0:
261 * "rotate-0"
262 * DRM_MODE_ROTATE_90:
263 * "rotate-90"
264 * DRM_MODE_ROTATE_180:
265 * "rotate-180"
266 * DRM_MODE_ROTATE_270:
267 * "rotate-270"
268 * DRM_MODE_REFLECT_X:
269 * "reflect-x"
270 * DRM_MODE_REFLECT_Y:
271 * "reflect-y"
272 *
273 * Rotation is the specified amount in degrees in counter clockwise direction,
274 * the X and Y axis are within the source rectangle, i.e. the X/Y axis before
275 * rotation. After reflection, the rotation is applied to the image sampled from
276 * the source rectangle, before scaling it to fit the destination rectangle.
277 */
278int drm_plane_create_rotation_property(struct drm_plane *plane,
279 unsigned int rotation,
280 unsigned int supported_rotations)
281{
282 static const struct drm_prop_enum_list props[] = {
283 { __builtin_ffs(DRM_MODE_ROTATE_0) - 1, "rotate-0" },
284 { __builtin_ffs(DRM_MODE_ROTATE_90) - 1, "rotate-90" },
285 { __builtin_ffs(DRM_MODE_ROTATE_180) - 1, "rotate-180" },
286 { __builtin_ffs(DRM_MODE_ROTATE_270) - 1, "rotate-270" },
287 { __builtin_ffs(DRM_MODE_REFLECT_X) - 1, "reflect-x" },
288 { __builtin_ffs(DRM_MODE_REFLECT_Y) - 1, "reflect-y" },
289 };
290 struct drm_property *prop;
291
292 WARN_ON((supported_rotations & DRM_MODE_ROTATE_MASK) == 0);
293 WARN_ON(!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK));
294 WARN_ON(rotation & ~supported_rotations);
295
296 prop = drm_property_create_bitmask(dev: plane->dev, flags: 0, name: "rotation",
297 props, ARRAY_SIZE(props),
298 supported_bits: supported_rotations);
299 if (!prop)
300 return -ENOMEM;
301
302 drm_object_attach_property(obj: &plane->base, property: prop, init_val: rotation);
303
304 if (plane->state)
305 plane->state->rotation = rotation;
306
307 plane->rotation_property = prop;
308
309 return 0;
310}
311EXPORT_SYMBOL(drm_plane_create_rotation_property);
312
313/**
314 * drm_rotation_simplify() - Try to simplify the rotation
315 * @rotation: Rotation to be simplified
316 * @supported_rotations: Supported rotations
317 *
318 * Attempt to simplify the rotation to a form that is supported.
319 * Eg. if the hardware supports everything except DRM_MODE_REFLECT_X
320 * one could call this function like this:
321 *
322 * drm_rotation_simplify(rotation, DRM_MODE_ROTATE_0 |
323 * DRM_MODE_ROTATE_90 | DRM_MODE_ROTATE_180 |
324 * DRM_MODE_ROTATE_270 | DRM_MODE_REFLECT_Y);
325 *
326 * to eliminate the DRM_MODE_REFLECT_X flag. Depending on what kind of
327 * transforms the hardware supports, this function may not
328 * be able to produce a supported transform, so the caller should
329 * check the result afterwards.
330 */
331unsigned int drm_rotation_simplify(unsigned int rotation,
332 unsigned int supported_rotations)
333{
334 if (rotation & ~supported_rotations) {
335 rotation ^= DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y;
336 rotation = (rotation & DRM_MODE_REFLECT_MASK) |
337 BIT((ffs(rotation & DRM_MODE_ROTATE_MASK) + 1)
338 % 4);
339 }
340
341 return rotation;
342}
343EXPORT_SYMBOL(drm_rotation_simplify);
344
345/**
346 * drm_plane_create_zpos_property - create mutable zpos property
347 * @plane: drm plane
348 * @zpos: initial value of zpos property
349 * @min: minimal possible value of zpos property
350 * @max: maximal possible value of zpos property
351 *
352 * This function initializes generic mutable zpos property and enables support
353 * for it in drm core. Drivers can then attach this property to planes to enable
354 * support for configurable planes arrangement during blending operation.
355 * Drivers that attach a mutable zpos property to any plane should call the
356 * drm_atomic_normalize_zpos() helper during their implementation of
357 * &drm_mode_config_funcs.atomic_check(), which will update the normalized zpos
358 * values and store them in &drm_plane_state.normalized_zpos. Usually min
359 * should be set to 0 and max to maximal number of planes for given crtc - 1.
360 *
361 * If zpos of some planes cannot be changed (like fixed background or
362 * cursor/topmost planes), drivers shall adjust the min/max values and assign
363 * those planes immutable zpos properties with lower or higher values (for more
364 * information, see drm_plane_create_zpos_immutable_property() function). In such
365 * case drivers shall also assign proper initial zpos values for all planes in
366 * its plane_reset() callback, so the planes will be always sorted properly.
367 *
368 * See also drm_atomic_normalize_zpos().
369 *
370 * The property exposed to userspace is called "zpos".
371 *
372 * Returns:
373 * Zero on success, negative errno on failure.
374 */
375int drm_plane_create_zpos_property(struct drm_plane *plane,
376 unsigned int zpos,
377 unsigned int min, unsigned int max)
378{
379 struct drm_property *prop;
380
381 prop = drm_property_create_range(dev: plane->dev, flags: 0, name: "zpos", min, max);
382 if (!prop)
383 return -ENOMEM;
384
385 drm_object_attach_property(obj: &plane->base, property: prop, init_val: zpos);
386
387 plane->zpos_property = prop;
388
389 if (plane->state) {
390 plane->state->zpos = zpos;
391 plane->state->normalized_zpos = zpos;
392 }
393
394 return 0;
395}
396EXPORT_SYMBOL(drm_plane_create_zpos_property);
397
398/**
399 * drm_plane_create_zpos_immutable_property - create immuttable zpos property
400 * @plane: drm plane
401 * @zpos: value of zpos property
402 *
403 * This function initializes generic immutable zpos property and enables
404 * support for it in drm core. Using this property driver lets userspace
405 * to get the arrangement of the planes for blending operation and notifies
406 * it that the hardware (or driver) doesn't support changing of the planes'
407 * order. For mutable zpos see drm_plane_create_zpos_property().
408 *
409 * The property exposed to userspace is called "zpos".
410 *
411 * Returns:
412 * Zero on success, negative errno on failure.
413 */
414int drm_plane_create_zpos_immutable_property(struct drm_plane *plane,
415 unsigned int zpos)
416{
417 struct drm_property *prop;
418
419 prop = drm_property_create_range(dev: plane->dev, DRM_MODE_PROP_IMMUTABLE,
420 name: "zpos", min: zpos, max: zpos);
421 if (!prop)
422 return -ENOMEM;
423
424 drm_object_attach_property(obj: &plane->base, property: prop, init_val: zpos);
425
426 plane->zpos_property = prop;
427
428 if (plane->state) {
429 plane->state->zpos = zpos;
430 plane->state->normalized_zpos = zpos;
431 }
432
433 return 0;
434}
435EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property);
436
437static int drm_atomic_state_zpos_cmp(const void *a, const void *b)
438{
439 const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
440 const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
441
442 if (sa->zpos != sb->zpos)
443 return sa->zpos - sb->zpos;
444 else
445 return sa->plane->base.id - sb->plane->base.id;
446}
447
448static int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
449 struct drm_crtc_state *crtc_state)
450{
451 struct drm_atomic_state *state = crtc_state->state;
452 struct drm_device *dev = crtc->dev;
453 int total_planes = dev->mode_config.num_total_plane;
454 struct drm_plane_state **states;
455 struct drm_plane *plane;
456 int i, n = 0;
457 int ret = 0;
458
459 drm_dbg_atomic(dev, "[CRTC:%d:%s] calculating normalized zpos values\n",
460 crtc->base.id, crtc->name);
461
462 states = kmalloc_array(total_planes, sizeof(*states), GFP_KERNEL);
463 if (!states)
464 return -ENOMEM;
465
466 /*
467 * Normalization process might create new states for planes which
468 * normalized_zpos has to be recalculated.
469 */
470 drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
471 struct drm_plane_state *plane_state =
472 drm_atomic_get_plane_state(state, plane);
473 if (IS_ERR(ptr: plane_state)) {
474 ret = PTR_ERR(ptr: plane_state);
475 goto done;
476 }
477 states[n++] = plane_state;
478 drm_dbg_atomic(dev, "[PLANE:%d:%s] processing zpos value %d\n",
479 plane->base.id, plane->name, plane_state->zpos);
480 }
481
482 sort(base: states, num: n, size: sizeof(*states), cmp_func: drm_atomic_state_zpos_cmp, NULL);
483
484 for (i = 0; i < n; i++) {
485 plane = states[i]->plane;
486
487 states[i]->normalized_zpos = i;
488 drm_dbg_atomic(dev, "[PLANE:%d:%s] normalized zpos value %d\n",
489 plane->base.id, plane->name, i);
490 }
491 crtc_state->zpos_changed = true;
492
493done:
494 kfree(objp: states);
495 return ret;
496}
497
498/**
499 * drm_atomic_normalize_zpos - calculate normalized zpos values for all crtcs
500 * @dev: DRM device
501 * @state: atomic state of DRM device
502 *
503 * This function calculates normalized zpos value for all modified planes in
504 * the provided atomic state of DRM device.
505 *
506 * For every CRTC this function checks new states of all planes assigned to
507 * it and calculates normalized zpos value for these planes. Planes are compared
508 * first by their zpos values, then by plane id (if zpos is equal). The plane
509 * with lowest zpos value is at the bottom. The &drm_plane_state.normalized_zpos
510 * is then filled with unique values from 0 to number of active planes in crtc
511 * minus one.
512 *
513 * RETURNS
514 * Zero for success or -errno
515 */
516int drm_atomic_normalize_zpos(struct drm_device *dev,
517 struct drm_atomic_state *state)
518{
519 struct drm_crtc *crtc;
520 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
521 struct drm_plane *plane;
522 struct drm_plane_state *old_plane_state, *new_plane_state;
523 int i, ret = 0;
524
525 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
526 crtc = new_plane_state->crtc;
527 if (!crtc)
528 continue;
529 if (old_plane_state->zpos != new_plane_state->zpos) {
530 new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
531 new_crtc_state->zpos_changed = true;
532 }
533 }
534
535 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
536 if (old_crtc_state->plane_mask != new_crtc_state->plane_mask ||
537 new_crtc_state->zpos_changed) {
538 ret = drm_atomic_helper_crtc_normalize_zpos(crtc,
539 crtc_state: new_crtc_state);
540 if (ret)
541 return ret;
542 }
543 }
544 return 0;
545}
546EXPORT_SYMBOL(drm_atomic_normalize_zpos);
547
548/**
549 * drm_plane_create_blend_mode_property - create a new blend mode property
550 * @plane: drm plane
551 * @supported_modes: bitmask of supported modes, must include
552 * BIT(DRM_MODE_BLEND_PREMULTI). Current DRM assumption is
553 * that alpha is premultiplied, and old userspace can break if
554 * the property defaults to anything else.
555 *
556 * This creates a new property describing the blend mode.
557 *
558 * The property exposed to userspace is an enumeration property (see
559 * drm_property_create_enum()) called "pixel blend mode" and has the
560 * following enumeration values:
561 *
562 * "None":
563 * Blend formula that ignores the pixel alpha.
564 *
565 * "Pre-multiplied":
566 * Blend formula that assumes the pixel color values have been already
567 * pre-multiplied with the alpha channel values.
568 *
569 * "Coverage":
570 * Blend formula that assumes the pixel color values have not been
571 * pre-multiplied and will do so when blending them to the background color
572 * values.
573 *
574 * RETURNS:
575 * Zero for success or -errno
576 */
577int drm_plane_create_blend_mode_property(struct drm_plane *plane,
578 unsigned int supported_modes)
579{
580 struct drm_device *dev = plane->dev;
581 struct drm_property *prop;
582 static const struct drm_prop_enum_list props[] = {
583 { DRM_MODE_BLEND_PIXEL_NONE, "None" },
584 { DRM_MODE_BLEND_PREMULTI, .name: "Pre-multiplied" },
585 { DRM_MODE_BLEND_COVERAGE, .name: "Coverage" },
586 };
587 unsigned int valid_mode_mask = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
588 BIT(DRM_MODE_BLEND_PREMULTI) |
589 BIT(DRM_MODE_BLEND_COVERAGE);
590 int i;
591
592 if (WARN_ON((supported_modes & ~valid_mode_mask) ||
593 ((supported_modes & BIT(DRM_MODE_BLEND_PREMULTI)) == 0)))
594 return -EINVAL;
595
596 prop = drm_property_create(dev, DRM_MODE_PROP_ENUM,
597 name: "pixel blend mode",
598 hweight32(supported_modes));
599 if (!prop)
600 return -ENOMEM;
601
602 for (i = 0; i < ARRAY_SIZE(props); i++) {
603 int ret;
604
605 if (!(BIT(props[i].type) & supported_modes))
606 continue;
607
608 ret = drm_property_add_enum(property: prop, value: props[i].type,
609 name: props[i].name);
610
611 if (ret) {
612 drm_property_destroy(dev, property: prop);
613
614 return ret;
615 }
616 }
617
618 drm_object_attach_property(obj: &plane->base, property: prop, DRM_MODE_BLEND_PREMULTI);
619 plane->blend_mode_property = prop;
620
621 return 0;
622}
623EXPORT_SYMBOL(drm_plane_create_blend_mode_property);
624