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44d1240d MS |
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 | #include <drm/drmP.h> | |
27 | #include <drm/drm_atomic.h> | |
18733802 | 28 | #include <drm/drm_blend.h> |
44d1240d MS |
29 | #include <linux/export.h> |
30 | #include <linux/slab.h> | |
31 | #include <linux/sort.h> | |
32 | ||
c30b4400 | 33 | #include "drm_crtc_internal.h" |
44d1240d | 34 | |
1e4d84c6 DV |
35 | /** |
36 | * DOC: overview | |
37 | * | |
38 | * The basic plane composition model supported by standard plane properties only | |
39 | * has a source rectangle (in logical pixels within the &drm_framebuffer), with | |
40 | * sub-pixel accuracy, which is scaled up to a pixel-aligned destination | |
41 | * rectangle in the visible area of a &drm_crtc. The visible area of a CRTC is | |
42 | * defined by the horizontal and vertical visible pixels (stored in @hdisplay | |
d574528a DV |
43 | * and @vdisplay) of the requested mode (stored in &drm_crtc_state.mode). These |
44 | * two rectangles are both stored in the &drm_plane_state. | |
1e4d84c6 DV |
45 | * |
46 | * For the atomic ioctl the following standard (atomic) properties on the plane object | |
47 | * encode the basic plane composition model: | |
48 | * | |
49 | * SRC_X: | |
50 | * X coordinate offset for the source rectangle within the | |
51 | * &drm_framebuffer, in 16.16 fixed point. Must be positive. | |
52 | * SRC_Y: | |
53 | * Y coordinate offset for the source rectangle within the | |
54 | * &drm_framebuffer, in 16.16 fixed point. Must be positive. | |
55 | * SRC_W: | |
56 | * Width for the source rectangle within the &drm_framebuffer, in 16.16 | |
57 | * fixed point. SRC_X plus SRC_W must be within the width of the source | |
58 | * framebuffer. Must be positive. | |
59 | * SRC_H: | |
60 | * Height for the source rectangle within the &drm_framebuffer, in 16.16 | |
61 | * fixed point. SRC_Y plus SRC_H must be within the height of the source | |
62 | * framebuffer. Must be positive. | |
63 | * CRTC_X: | |
64 | * X coordinate offset for the destination rectangle. Can be negative. | |
65 | * CRTC_Y: | |
66 | * Y coordinate offset for the destination rectangle. Can be negative. | |
67 | * CRTC_W: | |
68 | * Width for the destination rectangle. CRTC_X plus CRTC_W can extend past | |
69 | * the currently visible horizontal area of the &drm_crtc. | |
70 | * CRTC_H: | |
71 | * Height for the destination rectangle. CRTC_Y plus CRTC_H can extend past | |
72 | * the currently visible vertical area of the &drm_crtc. | |
73 | * FB_ID: | |
74 | * Mode object ID of the &drm_framebuffer this plane should scan out. | |
75 | * CRTC_ID: | |
76 | * Mode object ID of the &drm_crtc this plane should be connected to. | |
77 | * | |
78 | * Note that the source rectangle must fully lie within the bounds of the | |
79 | * &drm_framebuffer. The destination rectangle can lie outside of the visible | |
80 | * area of the current mode of the CRTC. It must be apprpriately clipped by the | |
81 | * driver, which can be done by calling drm_plane_helper_check_update(). Drivers | |
82 | * are also allowed to round the subpixel sampling positions appropriately, but | |
83 | * only to the next full pixel. No pixel outside of the source rectangle may | |
84 | * ever be sampled, which is important when applying more sophisticated | |
85 | * filtering than just a bilinear one when scaling. The filtering mode when | |
86 | * scaling is unspecified. | |
87 | * | |
88 | * On top of this basic transformation additional properties can be exposed by | |
89 | * the driver: | |
90 | * | |
6686df8c | 91 | * - Rotation is set up with drm_plane_create_rotation_property(). It adds a |
1e4d84c6 DV |
92 | * rotation and reflection step between the source and destination rectangles. |
93 | * Without this property the rectangle is only scaled, but not rotated or | |
94 | * reflected. | |
95 | * | |
96 | * - Z position is set up with drm_plane_create_zpos_immutable_property() and | |
97 | * drm_plane_create_zpos_property(). It controls the visibility of overlapping | |
98 | * planes. Without this property the primary plane is always below the cursor | |
99 | * plane, and ordering between all other planes is undefined. | |
100 | * | |
101 | * Note that all the property extensions described here apply either to the | |
102 | * plane or the CRTC (e.g. for the background color, which currently is not | |
103 | * exposed and assumed to be black). | |
104 | */ | |
105 | ||
106 | /** | |
6686df8c VS |
107 | * drm_plane_create_rotation_property - create a new rotation property |
108 | * @plane: drm plane | |
109 | * @rotation: initial value of the rotation property | |
1e4d84c6 DV |
110 | * @supported_rotations: bitmask of supported rotations and reflections |
111 | * | |
112 | * This creates a new property with the selected support for transformations. | |
1e4d84c6 DV |
113 | * |
114 | * Since a rotation by 180° degress is the same as reflecting both along the x | |
115 | * and the y axis the rotation property is somewhat redundant. Drivers can use | |
116 | * drm_rotation_simplify() to normalize values of this property. | |
117 | * | |
118 | * The property exposed to userspace is a bitmask property (see | |
119 | * drm_property_create_bitmask()) called "rotation" and has the following | |
120 | * bitmask enumaration values: | |
121 | * | |
c2c446ad | 122 | * DRM_MODE_ROTATE_0: |
1e4d84c6 | 123 | * "rotate-0" |
c2c446ad | 124 | * DRM_MODE_ROTATE_90: |
1e4d84c6 | 125 | * "rotate-90" |
c2c446ad | 126 | * DRM_MODE_ROTATE_180: |
1e4d84c6 | 127 | * "rotate-180" |
c2c446ad | 128 | * DRM_MODE_ROTATE_270: |
1e4d84c6 | 129 | * "rotate-270" |
c2c446ad | 130 | * DRM_MODE_REFLECT_X: |
1e4d84c6 | 131 | * "reflect-x" |
c2c446ad | 132 | * DRM_MODE_REFLECT_Y: |
1e4d84c6 DV |
133 | * "reflect-y" |
134 | * | |
135 | * Rotation is the specified amount in degrees in counter clockwise direction, | |
136 | * the X and Y axis are within the source rectangle, i.e. the X/Y axis before | |
137 | * rotation. After reflection, the rotation is applied to the image sampled from | |
138 | * the source rectangle, before scaling it to fit the destination rectangle. | |
139 | */ | |
d138dd3c VS |
140 | int drm_plane_create_rotation_property(struct drm_plane *plane, |
141 | unsigned int rotation, | |
142 | unsigned int supported_rotations) | |
143 | { | |
144 | static const struct drm_prop_enum_list props[] = { | |
c2c446ad RF |
145 | { __builtin_ffs(DRM_MODE_ROTATE_0) - 1, "rotate-0" }, |
146 | { __builtin_ffs(DRM_MODE_ROTATE_90) - 1, "rotate-90" }, | |
147 | { __builtin_ffs(DRM_MODE_ROTATE_180) - 1, "rotate-180" }, | |
148 | { __builtin_ffs(DRM_MODE_ROTATE_270) - 1, "rotate-270" }, | |
149 | { __builtin_ffs(DRM_MODE_REFLECT_X) - 1, "reflect-x" }, | |
150 | { __builtin_ffs(DRM_MODE_REFLECT_Y) - 1, "reflect-y" }, | |
d138dd3c VS |
151 | }; |
152 | struct drm_property *prop; | |
153 | ||
c2c446ad RF |
154 | WARN_ON((supported_rotations & DRM_MODE_ROTATE_MASK) == 0); |
155 | WARN_ON(!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK)); | |
d138dd3c VS |
156 | WARN_ON(rotation & ~supported_rotations); |
157 | ||
158 | prop = drm_property_create_bitmask(plane->dev, 0, "rotation", | |
159 | props, ARRAY_SIZE(props), | |
160 | supported_rotations); | |
161 | if (!prop) | |
162 | return -ENOMEM; | |
163 | ||
164 | drm_object_attach_property(&plane->base, prop, rotation); | |
165 | ||
166 | if (plane->state) | |
167 | plane->state->rotation = rotation; | |
168 | ||
169 | plane->rotation_property = prop; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | EXPORT_SYMBOL(drm_plane_create_rotation_property); | |
174 | ||
18733802 DV |
175 | /** |
176 | * drm_rotation_simplify() - Try to simplify the rotation | |
177 | * @rotation: Rotation to be simplified | |
178 | * @supported_rotations: Supported rotations | |
179 | * | |
180 | * Attempt to simplify the rotation to a form that is supported. | |
c2c446ad | 181 | * Eg. if the hardware supports everything except DRM_MODE_REFLECT_X |
18733802 DV |
182 | * one could call this function like this: |
183 | * | |
c2c446ad RF |
184 | * drm_rotation_simplify(rotation, DRM_MODE_ROTATE_0 | |
185 | * DRM_MODE_ROTATE_90 | DRM_MODE_ROTATE_180 | | |
186 | * DRM_MODE_ROTATE_270 | DRM_MODE_REFLECT_Y); | |
18733802 | 187 | * |
c2c446ad | 188 | * to eliminate the DRM_MODE_ROTATE_X flag. Depending on what kind of |
18733802 DV |
189 | * transforms the hardware supports, this function may not |
190 | * be able to produce a supported transform, so the caller should | |
191 | * check the result afterwards. | |
192 | */ | |
193 | unsigned int drm_rotation_simplify(unsigned int rotation, | |
194 | unsigned int supported_rotations) | |
195 | { | |
196 | if (rotation & ~supported_rotations) { | |
c2c446ad RF |
197 | rotation ^= DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y; |
198 | rotation = (rotation & DRM_MODE_REFLECT_MASK) | | |
199 | BIT((ffs(rotation & DRM_MODE_ROTATE_MASK) + 1) | |
200 | % 4); | |
18733802 DV |
201 | } |
202 | ||
203 | return rotation; | |
204 | } | |
205 | EXPORT_SYMBOL(drm_rotation_simplify); | |
206 | ||
44d1240d MS |
207 | /** |
208 | * drm_plane_create_zpos_property - create mutable zpos property | |
209 | * @plane: drm plane | |
210 | * @zpos: initial value of zpos property | |
211 | * @min: minimal possible value of zpos property | |
212 | * @max: maximal possible value of zpos property | |
213 | * | |
214 | * This function initializes generic mutable zpos property and enables support | |
215 | * for it in drm core. Drivers can then attach this property to planes to enable | |
216 | * support for configurable planes arrangement during blending operation. | |
217 | * Once mutable zpos property has been enabled, the DRM core will automatically | |
d574528a | 218 | * calculate &drm_plane_state.normalized_zpos values. Usually min should be set |
44d1240d MS |
219 | * to 0 and max to maximal number of planes for given crtc - 1. |
220 | * | |
221 | * If zpos of some planes cannot be changed (like fixed background or | |
222 | * cursor/topmost planes), driver should adjust min/max values and assign those | |
223 | * planes immutable zpos property with lower or higher values (for more | |
1e4d84c6 | 224 | * information, see drm_plane_create_zpos_immutable_property() function). In such |
44d1240d MS |
225 | * case driver should also assign proper initial zpos values for all planes in |
226 | * its plane_reset() callback, so the planes will be always sorted properly. | |
227 | * | |
1e4d84c6 DV |
228 | * See also drm_atomic_normalize_zpos(). |
229 | * | |
230 | * The property exposed to userspace is called "zpos". | |
231 | * | |
44d1240d MS |
232 | * Returns: |
233 | * Zero on success, negative errno on failure. | |
234 | */ | |
235 | int drm_plane_create_zpos_property(struct drm_plane *plane, | |
236 | unsigned int zpos, | |
237 | unsigned int min, unsigned int max) | |
238 | { | |
239 | struct drm_property *prop; | |
240 | ||
241 | prop = drm_property_create_range(plane->dev, 0, "zpos", min, max); | |
242 | if (!prop) | |
243 | return -ENOMEM; | |
244 | ||
245 | drm_object_attach_property(&plane->base, prop, zpos); | |
246 | ||
247 | plane->zpos_property = prop; | |
248 | ||
249 | if (plane->state) { | |
250 | plane->state->zpos = zpos; | |
251 | plane->state->normalized_zpos = zpos; | |
252 | } | |
253 | ||
254 | return 0; | |
255 | } | |
256 | EXPORT_SYMBOL(drm_plane_create_zpos_property); | |
257 | ||
258 | /** | |
259 | * drm_plane_create_zpos_immutable_property - create immuttable zpos property | |
260 | * @plane: drm plane | |
261 | * @zpos: value of zpos property | |
262 | * | |
263 | * This function initializes generic immutable zpos property and enables | |
264 | * support for it in drm core. Using this property driver lets userspace | |
265 | * to get the arrangement of the planes for blending operation and notifies | |
266 | * it that the hardware (or driver) doesn't support changing of the planes' | |
1e4d84c6 DV |
267 | * order. For mutable zpos see drm_plane_create_zpos_property(). |
268 | * | |
269 | * The property exposed to userspace is called "zpos". | |
44d1240d MS |
270 | * |
271 | * Returns: | |
272 | * Zero on success, negative errno on failure. | |
273 | */ | |
274 | int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, | |
275 | unsigned int zpos) | |
276 | { | |
277 | struct drm_property *prop; | |
278 | ||
279 | prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE, | |
280 | "zpos", zpos, zpos); | |
281 | if (!prop) | |
282 | return -ENOMEM; | |
283 | ||
284 | drm_object_attach_property(&plane->base, prop, zpos); | |
285 | ||
286 | plane->zpos_property = prop; | |
287 | ||
288 | if (plane->state) { | |
289 | plane->state->zpos = zpos; | |
290 | plane->state->normalized_zpos = zpos; | |
291 | } | |
292 | ||
293 | return 0; | |
294 | } | |
295 | EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property); | |
296 | ||
297 | static int drm_atomic_state_zpos_cmp(const void *a, const void *b) | |
298 | { | |
299 | const struct drm_plane_state *sa = *(struct drm_plane_state **)a; | |
300 | const struct drm_plane_state *sb = *(struct drm_plane_state **)b; | |
301 | ||
302 | if (sa->zpos != sb->zpos) | |
303 | return sa->zpos - sb->zpos; | |
304 | else | |
305 | return sa->plane->base.id - sb->plane->base.id; | |
306 | } | |
307 | ||
44d1240d MS |
308 | static int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc, |
309 | struct drm_crtc_state *crtc_state) | |
310 | { | |
311 | struct drm_atomic_state *state = crtc_state->state; | |
312 | struct drm_device *dev = crtc->dev; | |
313 | int total_planes = dev->mode_config.num_total_plane; | |
314 | struct drm_plane_state **states; | |
315 | struct drm_plane *plane; | |
316 | int i, n = 0; | |
317 | int ret = 0; | |
318 | ||
319 | DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", | |
320 | crtc->base.id, crtc->name); | |
321 | ||
322 | states = kmalloc_array(total_planes, sizeof(*states), GFP_TEMPORARY); | |
323 | if (!states) | |
324 | return -ENOMEM; | |
325 | ||
326 | /* | |
327 | * Normalization process might create new states for planes which | |
328 | * normalized_zpos has to be recalculated. | |
329 | */ | |
330 | drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { | |
331 | struct drm_plane_state *plane_state = | |
332 | drm_atomic_get_plane_state(state, plane); | |
333 | if (IS_ERR(plane_state)) { | |
334 | ret = PTR_ERR(plane_state); | |
335 | goto done; | |
336 | } | |
337 | states[n++] = plane_state; | |
338 | DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n", | |
339 | plane->base.id, plane->name, | |
340 | plane_state->zpos); | |
341 | } | |
342 | ||
343 | sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL); | |
344 | ||
345 | for (i = 0; i < n; i++) { | |
346 | plane = states[i]->plane; | |
347 | ||
348 | states[i]->normalized_zpos = i; | |
349 | DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n", | |
350 | plane->base.id, plane->name, i); | |
351 | } | |
352 | crtc_state->zpos_changed = true; | |
353 | ||
354 | done: | |
355 | kfree(states); | |
356 | return ret; | |
357 | } | |
358 | ||
359 | /** | |
52a9fcda | 360 | * drm_atomic_normalize_zpos - calculate normalized zpos values for all crtcs |
44d1240d MS |
361 | * @dev: DRM device |
362 | * @state: atomic state of DRM device | |
363 | * | |
364 | * This function calculates normalized zpos value for all modified planes in | |
1e4d84c6 DV |
365 | * the provided atomic state of DRM device. |
366 | * | |
367 | * For every CRTC this function checks new states of all planes assigned to | |
368 | * it and calculates normalized zpos value for these planes. Planes are compared | |
369 | * first by their zpos values, then by plane id (if zpos is equal). The plane | |
d574528a DV |
370 | * with lowest zpos value is at the bottom. The &drm_plane_state.normalized_zpos |
371 | * is then filled with unique values from 0 to number of active planes in crtc | |
1e4d84c6 | 372 | * minus one. |
44d1240d MS |
373 | * |
374 | * RETURNS | |
375 | * Zero for success or -errno | |
376 | */ | |
52a9fcda DV |
377 | int drm_atomic_normalize_zpos(struct drm_device *dev, |
378 | struct drm_atomic_state *state) | |
44d1240d MS |
379 | { |
380 | struct drm_crtc *crtc; | |
62c7bdc0 | 381 | struct drm_crtc_state *old_crtc_state, *new_crtc_state; |
44d1240d | 382 | struct drm_plane *plane; |
62c7bdc0 | 383 | struct drm_plane_state *old_plane_state, *new_plane_state; |
44d1240d MS |
384 | int i, ret = 0; |
385 | ||
62c7bdc0 ML |
386 | for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { |
387 | crtc = new_plane_state->crtc; | |
44d1240d MS |
388 | if (!crtc) |
389 | continue; | |
62c7bdc0 ML |
390 | if (old_plane_state->zpos != new_plane_state->zpos) { |
391 | new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); | |
392 | new_crtc_state->zpos_changed = true; | |
44d1240d MS |
393 | } |
394 | } | |
395 | ||
62c7bdc0 ML |
396 | for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { |
397 | if (old_crtc_state->plane_mask != new_crtc_state->plane_mask || | |
398 | new_crtc_state->zpos_changed) { | |
44d1240d | 399 | ret = drm_atomic_helper_crtc_normalize_zpos(crtc, |
62c7bdc0 | 400 | new_crtc_state); |
44d1240d MS |
401 | if (ret) |
402 | return ret; | |
403 | } | |
404 | } | |
405 | return 0; | |
406 | } | |
52a9fcda | 407 | EXPORT_SYMBOL(drm_atomic_normalize_zpos); |