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