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