Commit | Line | Data |
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f1e2f66c DV |
1 | /* |
2 | * Copyright (c) 2016 Intel Corporation | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
0500c04e SR |
23 | #include <linux/uaccess.h> |
24 | ||
f1e2f66c | 25 | #include <drm/drm_color_mgmt.h> |
0500c04e SR |
26 | #include <drm/drm_crtc.h> |
27 | #include <drm/drm_device.h> | |
28 | #include <drm/drm_drv.h> | |
29 | #include <drm/drm_print.h> | |
f1e2f66c DV |
30 | |
31 | #include "drm_crtc_internal.h" | |
32 | ||
a6acccf8 DV |
33 | /** |
34 | * DOC: overview | |
35 | * | |
36 | * Color management or color space adjustments is supported through a set of 5 | |
37 | * properties on the &drm_crtc object. They are set up by calling | |
38 | * drm_crtc_enable_color_mgmt(). | |
39 | * | |
40 | * "DEGAMMA_LUT”: | |
41 | * Blob property to set the degamma lookup table (LUT) mapping pixel data | |
42 | * from the framebuffer before it is given to the transformation matrix. | |
ea0dd85a | 43 | * The data is interpreted as an array of &struct drm_color_lut elements. |
a6acccf8 DV |
44 | * Hardware might choose not to use the full precision of the LUT elements |
45 | * nor use all the elements of the LUT (for example the hardware might | |
46 | * choose to interpolate between LUT[0] and LUT[4]). | |
47 | * | |
717fd813 DV |
48 | * Setting this to NULL (blob property value set to 0) means a |
49 | * linear/pass-thru gamma table should be used. This is generally the | |
2e38178e DV |
50 | * driver boot-up state too. Drivers can access this blob through |
51 | * &drm_crtc_state.degamma_lut. | |
717fd813 | 52 | * |
a6acccf8 DV |
53 | * “DEGAMMA_LUT_SIZE”: |
54 | * Unsinged range property to give the size of the lookup table to be set | |
55 | * on the DEGAMMA_LUT property (the size depends on the underlying | |
56 | * hardware). If drivers support multiple LUT sizes then they should | |
57 | * publish the largest size, and sub-sample smaller sized LUTs (e.g. for | |
58 | * split-gamma modes) appropriately. | |
59 | * | |
60 | * “CTM”: | |
61 | * Blob property to set the current transformation matrix (CTM) apply to | |
62 | * pixel data after the lookup through the degamma LUT and before the | |
63 | * lookup through the gamma LUT. The data is interpreted as a struct | |
64 | * &drm_color_ctm. | |
65 | * | |
717fd813 DV |
66 | * Setting this to NULL (blob property value set to 0) means a |
67 | * unit/pass-thru matrix should be used. This is generally the driver | |
2e38178e DV |
68 | * boot-up state too. Drivers can access the blob for the color conversion |
69 | * matrix through &drm_crtc_state.ctm. | |
717fd813 | 70 | * |
a6acccf8 DV |
71 | * “GAMMA_LUT”: |
72 | * Blob property to set the gamma lookup table (LUT) mapping pixel data | |
73 | * after the transformation matrix to data sent to the connector. The | |
ea0dd85a | 74 | * data is interpreted as an array of &struct drm_color_lut elements. |
a6acccf8 DV |
75 | * Hardware might choose not to use the full precision of the LUT elements |
76 | * nor use all the elements of the LUT (for example the hardware might | |
77 | * choose to interpolate between LUT[0] and LUT[4]). | |
78 | * | |
717fd813 DV |
79 | * Setting this to NULL (blob property value set to 0) means a |
80 | * linear/pass-thru gamma table should be used. This is generally the | |
2e38178e DV |
81 | * driver boot-up state too. Drivers can access this blob through |
82 | * &drm_crtc_state.gamma_lut. | |
717fd813 | 83 | * |
a6acccf8 DV |
84 | * “GAMMA_LUT_SIZE”: |
85 | * Unsigned range property to give the size of the lookup table to be set | |
86 | * on the GAMMA_LUT property (the size depends on the underlying hardware). | |
87 | * If drivers support multiple LUT sizes then they should publish the | |
88 | * largest size, and sub-sample smaller sized LUTs (e.g. for split-gamma | |
89 | * modes) appropriately. | |
90 | * | |
91 | * There is also support for a legacy gamma table, which is set up by calling | |
92 | * drm_mode_crtc_set_gamma_size(). Drivers which support both should use | |
93 | * drm_atomic_helper_legacy_gamma_set() to alias the legacy gamma ramp with the | |
94 | * "GAMMA_LUT" property above. | |
80f690e9 JS |
95 | * |
96 | * Support for different non RGB color encodings is controlled through | |
97 | * &drm_plane specific COLOR_ENCODING and COLOR_RANGE properties. They | |
98 | * are set up by calling drm_plane_create_color_properties(). | |
99 | * | |
100 | * "COLOR_ENCODING" | |
101 | * Optional plane enum property to support different non RGB | |
102 | * color encodings. The driver can provide a subset of standard | |
103 | * enum values supported by the DRM plane. | |
104 | * | |
105 | * "COLOR_RANGE" | |
106 | * Optional plane enum property to support different non RGB | |
107 | * color parameter ranges. The driver can provide a subset of | |
108 | * standard enum values supported by the DRM plane. | |
a6acccf8 | 109 | */ |
f1e2f66c | 110 | |
8f2e045e JN |
111 | /** |
112 | * drm_color_lut_extract - clamp and round LUT entries | |
113 | * @user_input: input value | |
114 | * @bit_precision: number of bits the hw LUT supports | |
115 | * | |
116 | * Extract a degamma/gamma LUT value provided by user (in the form of | |
117 | * &drm_color_lut entries) and round it to the precision supported by the | |
118 | * hardware. | |
119 | */ | |
120 | uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision) | |
121 | { | |
122 | uint32_t val = user_input; | |
123 | uint32_t max = 0xffff >> (16 - bit_precision); | |
124 | ||
125 | /* Round only if we're not using full precision. */ | |
126 | if (bit_precision < 16) { | |
127 | val += 1UL << (16 - bit_precision - 1); | |
128 | val >>= 16 - bit_precision; | |
129 | } | |
130 | ||
131 | return clamp_val(val, 0, max); | |
132 | } | |
133 | EXPORT_SYMBOL(drm_color_lut_extract); | |
134 | ||
f1e2f66c DV |
135 | /** |
136 | * drm_crtc_enable_color_mgmt - enable color management properties | |
137 | * @crtc: DRM CRTC | |
138 | * @degamma_lut_size: the size of the degamma lut (before CSC) | |
139 | * @has_ctm: whether to attach ctm_property for CSC matrix | |
140 | * @gamma_lut_size: the size of the gamma lut (after CSC) | |
141 | * | |
142 | * This function lets the driver enable the color correction | |
143 | * properties on a CRTC. This includes 3 degamma, csc and gamma | |
144 | * properties that userspace can set and 2 size properties to inform | |
145 | * the userspace of the lut sizes. Each of the properties are | |
146 | * optional. The gamma and degamma properties are only attached if | |
147 | * their size is not 0 and ctm_property is only attached if has_ctm is | |
148 | * true. | |
d7b66de5 DV |
149 | * |
150 | * Drivers should use drm_atomic_helper_legacy_gamma_set() to implement the | |
151 | * legacy &drm_crtc_funcs.gamma_set callback. | |
f1e2f66c DV |
152 | */ |
153 | void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc, | |
154 | uint degamma_lut_size, | |
155 | bool has_ctm, | |
156 | uint gamma_lut_size) | |
157 | { | |
158 | struct drm_device *dev = crtc->dev; | |
159 | struct drm_mode_config *config = &dev->mode_config; | |
160 | ||
161 | if (degamma_lut_size) { | |
162 | drm_object_attach_property(&crtc->base, | |
163 | config->degamma_lut_property, 0); | |
164 | drm_object_attach_property(&crtc->base, | |
165 | config->degamma_lut_size_property, | |
166 | degamma_lut_size); | |
167 | } | |
168 | ||
169 | if (has_ctm) | |
170 | drm_object_attach_property(&crtc->base, | |
171 | config->ctm_property, 0); | |
172 | ||
173 | if (gamma_lut_size) { | |
174 | drm_object_attach_property(&crtc->base, | |
175 | config->gamma_lut_property, 0); | |
176 | drm_object_attach_property(&crtc->base, | |
177 | config->gamma_lut_size_property, | |
178 | gamma_lut_size); | |
179 | } | |
180 | } | |
181 | EXPORT_SYMBOL(drm_crtc_enable_color_mgmt); | |
182 | ||
183 | /** | |
184 | * drm_mode_crtc_set_gamma_size - set the gamma table size | |
185 | * @crtc: CRTC to set the gamma table size for | |
186 | * @gamma_size: size of the gamma table | |
187 | * | |
188 | * Drivers which support gamma tables should set this to the supported gamma | |
189 | * table size when initializing the CRTC. Currently the drm core only supports a | |
190 | * fixed gamma table size. | |
191 | * | |
192 | * Returns: | |
193 | * Zero on success, negative errno on failure. | |
194 | */ | |
195 | int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc, | |
196 | int gamma_size) | |
197 | { | |
198 | uint16_t *r_base, *g_base, *b_base; | |
199 | int i; | |
200 | ||
201 | crtc->gamma_size = gamma_size; | |
202 | ||
203 | crtc->gamma_store = kcalloc(gamma_size, sizeof(uint16_t) * 3, | |
204 | GFP_KERNEL); | |
205 | if (!crtc->gamma_store) { | |
206 | crtc->gamma_size = 0; | |
207 | return -ENOMEM; | |
208 | } | |
209 | ||
210 | r_base = crtc->gamma_store; | |
211 | g_base = r_base + gamma_size; | |
212 | b_base = g_base + gamma_size; | |
213 | for (i = 0; i < gamma_size; i++) { | |
214 | r_base[i] = i << 8; | |
215 | g_base[i] = i << 8; | |
216 | b_base[i] = i << 8; | |
217 | } | |
218 | ||
219 | ||
220 | return 0; | |
221 | } | |
222 | EXPORT_SYMBOL(drm_mode_crtc_set_gamma_size); | |
223 | ||
224 | /** | |
225 | * drm_mode_gamma_set_ioctl - set the gamma table | |
226 | * @dev: DRM device | |
227 | * @data: ioctl data | |
228 | * @file_priv: DRM file info | |
229 | * | |
230 | * Set the gamma table of a CRTC to the one passed in by the user. Userspace can | |
231 | * inquire the required gamma table size through drm_mode_gamma_get_ioctl. | |
232 | * | |
233 | * Called by the user via ioctl. | |
234 | * | |
235 | * Returns: | |
236 | * Zero on success, negative errno on failure. | |
237 | */ | |
238 | int drm_mode_gamma_set_ioctl(struct drm_device *dev, | |
239 | void *data, struct drm_file *file_priv) | |
240 | { | |
241 | struct drm_mode_crtc_lut *crtc_lut = data; | |
242 | struct drm_crtc *crtc; | |
243 | void *r_base, *g_base, *b_base; | |
244 | int size; | |
ca659e0e | 245 | struct drm_modeset_acquire_ctx ctx; |
f1e2f66c DV |
246 | int ret = 0; |
247 | ||
248 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 249 | return -EOPNOTSUPP; |
f1e2f66c | 250 | |
418da172 | 251 | crtc = drm_crtc_find(dev, file_priv, crtc_lut->crtc_id); |
ca659e0e DV |
252 | if (!crtc) |
253 | return -ENOENT; | |
f1e2f66c | 254 | |
ca659e0e DV |
255 | if (crtc->funcs->gamma_set == NULL) |
256 | return -ENOSYS; | |
f1e2f66c DV |
257 | |
258 | /* memcpy into gamma store */ | |
ca659e0e DV |
259 | if (crtc_lut->gamma_size != crtc->gamma_size) |
260 | return -EINVAL; | |
261 | ||
b7ea04d2 | 262 | DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret); |
f1e2f66c DV |
263 | |
264 | size = crtc_lut->gamma_size * (sizeof(uint16_t)); | |
265 | r_base = crtc->gamma_store; | |
266 | if (copy_from_user(r_base, (void __user *)(unsigned long)crtc_lut->red, size)) { | |
267 | ret = -EFAULT; | |
268 | goto out; | |
269 | } | |
270 | ||
271 | g_base = r_base + size; | |
272 | if (copy_from_user(g_base, (void __user *)(unsigned long)crtc_lut->green, size)) { | |
273 | ret = -EFAULT; | |
274 | goto out; | |
275 | } | |
276 | ||
277 | b_base = g_base + size; | |
278 | if (copy_from_user(b_base, (void __user *)(unsigned long)crtc_lut->blue, size)) { | |
279 | ret = -EFAULT; | |
280 | goto out; | |
281 | } | |
282 | ||
6d124ff8 DV |
283 | ret = crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, |
284 | crtc->gamma_size, &ctx); | |
f1e2f66c DV |
285 | |
286 | out: | |
b7ea04d2 | 287 | DRM_MODESET_LOCK_ALL_END(ctx, ret); |
f1e2f66c DV |
288 | return ret; |
289 | ||
290 | } | |
291 | ||
292 | /** | |
293 | * drm_mode_gamma_get_ioctl - get the gamma table | |
294 | * @dev: DRM device | |
295 | * @data: ioctl data | |
296 | * @file_priv: DRM file info | |
297 | * | |
298 | * Copy the current gamma table into the storage provided. This also provides | |
299 | * the gamma table size the driver expects, which can be used to size the | |
300 | * allocated storage. | |
301 | * | |
302 | * Called by the user via ioctl. | |
303 | * | |
304 | * Returns: | |
305 | * Zero on success, negative errno on failure. | |
306 | */ | |
307 | int drm_mode_gamma_get_ioctl(struct drm_device *dev, | |
308 | void *data, struct drm_file *file_priv) | |
309 | { | |
310 | struct drm_mode_crtc_lut *crtc_lut = data; | |
311 | struct drm_crtc *crtc; | |
312 | void *r_base, *g_base, *b_base; | |
313 | int size; | |
314 | int ret = 0; | |
315 | ||
316 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 317 | return -EOPNOTSUPP; |
f1e2f66c | 318 | |
418da172 | 319 | crtc = drm_crtc_find(dev, file_priv, crtc_lut->crtc_id); |
04ee39ba DV |
320 | if (!crtc) |
321 | return -ENOENT; | |
f1e2f66c DV |
322 | |
323 | /* memcpy into gamma store */ | |
04ee39ba DV |
324 | if (crtc_lut->gamma_size != crtc->gamma_size) |
325 | return -EINVAL; | |
f1e2f66c | 326 | |
04ee39ba | 327 | drm_modeset_lock(&crtc->mutex, NULL); |
f1e2f66c DV |
328 | size = crtc_lut->gamma_size * (sizeof(uint16_t)); |
329 | r_base = crtc->gamma_store; | |
330 | if (copy_to_user((void __user *)(unsigned long)crtc_lut->red, r_base, size)) { | |
331 | ret = -EFAULT; | |
332 | goto out; | |
333 | } | |
334 | ||
335 | g_base = r_base + size; | |
336 | if (copy_to_user((void __user *)(unsigned long)crtc_lut->green, g_base, size)) { | |
337 | ret = -EFAULT; | |
338 | goto out; | |
339 | } | |
340 | ||
341 | b_base = g_base + size; | |
342 | if (copy_to_user((void __user *)(unsigned long)crtc_lut->blue, b_base, size)) { | |
343 | ret = -EFAULT; | |
344 | goto out; | |
345 | } | |
346 | out: | |
04ee39ba | 347 | drm_modeset_unlock(&crtc->mutex); |
f1e2f66c DV |
348 | return ret; |
349 | } | |
80f690e9 JS |
350 | |
351 | static const char * const color_encoding_name[] = { | |
352 | [DRM_COLOR_YCBCR_BT601] = "ITU-R BT.601 YCbCr", | |
353 | [DRM_COLOR_YCBCR_BT709] = "ITU-R BT.709 YCbCr", | |
354 | [DRM_COLOR_YCBCR_BT2020] = "ITU-R BT.2020 YCbCr", | |
355 | }; | |
356 | ||
357 | static const char * const color_range_name[] = { | |
358 | [DRM_COLOR_YCBCR_FULL_RANGE] = "YCbCr full range", | |
359 | [DRM_COLOR_YCBCR_LIMITED_RANGE] = "YCbCr limited range", | |
360 | }; | |
361 | ||
56dbbaff VS |
362 | /** |
363 | * drm_get_color_encoding_name - return a string for color encoding | |
364 | * @encoding: color encoding to compute name of | |
365 | * | |
366 | * In contrast to the other drm_get_*_name functions this one here returns a | |
367 | * const pointer and hence is threadsafe. | |
368 | */ | |
369 | const char *drm_get_color_encoding_name(enum drm_color_encoding encoding) | |
370 | { | |
371 | if (WARN_ON(encoding >= ARRAY_SIZE(color_encoding_name))) | |
372 | return "unknown"; | |
373 | ||
374 | return color_encoding_name[encoding]; | |
375 | } | |
376 | ||
377 | /** | |
378 | * drm_get_color_range_name - return a string for color range | |
379 | * @range: color range to compute name of | |
380 | * | |
381 | * In contrast to the other drm_get_*_name functions this one here returns a | |
382 | * const pointer and hence is threadsafe. | |
383 | */ | |
384 | const char *drm_get_color_range_name(enum drm_color_range range) | |
385 | { | |
386 | if (WARN_ON(range >= ARRAY_SIZE(color_range_name))) | |
387 | return "unknown"; | |
388 | ||
389 | return color_range_name[range]; | |
390 | } | |
391 | ||
80f690e9 JS |
392 | /** |
393 | * drm_plane_create_color_properties - color encoding related plane properties | |
394 | * @plane: plane object | |
395 | * @supported_encodings: bitfield indicating supported color encodings | |
396 | * @supported_ranges: bitfileld indicating supported color ranges | |
397 | * @default_encoding: default color encoding | |
398 | * @default_range: default color range | |
399 | * | |
400 | * Create and attach plane specific COLOR_ENCODING and COLOR_RANGE | |
401 | * properties to @plane. The supported encodings and ranges should | |
402 | * be provided in supported_encodings and supported_ranges bitmasks. | |
403 | * Each bit set in the bitmask indicates that its number as enum | |
404 | * value is supported. | |
405 | */ | |
406 | int drm_plane_create_color_properties(struct drm_plane *plane, | |
407 | u32 supported_encodings, | |
408 | u32 supported_ranges, | |
409 | enum drm_color_encoding default_encoding, | |
410 | enum drm_color_range default_range) | |
411 | { | |
412 | struct drm_device *dev = plane->dev; | |
413 | struct drm_property *prop; | |
3c8ba0d6 KC |
414 | struct drm_prop_enum_list enum_list[max_t(int, DRM_COLOR_ENCODING_MAX, |
415 | DRM_COLOR_RANGE_MAX)]; | |
80f690e9 JS |
416 | int i, len; |
417 | ||
418 | if (WARN_ON(supported_encodings == 0 || | |
419 | (supported_encodings & -BIT(DRM_COLOR_ENCODING_MAX)) != 0 || | |
420 | (supported_encodings & BIT(default_encoding)) == 0)) | |
421 | return -EINVAL; | |
422 | ||
423 | if (WARN_ON(supported_ranges == 0 || | |
424 | (supported_ranges & -BIT(DRM_COLOR_RANGE_MAX)) != 0 || | |
425 | (supported_ranges & BIT(default_range)) == 0)) | |
426 | return -EINVAL; | |
427 | ||
428 | len = 0; | |
429 | for (i = 0; i < DRM_COLOR_ENCODING_MAX; i++) { | |
430 | if ((supported_encodings & BIT(i)) == 0) | |
431 | continue; | |
432 | ||
433 | enum_list[len].type = i; | |
434 | enum_list[len].name = color_encoding_name[i]; | |
435 | len++; | |
436 | } | |
437 | ||
438 | prop = drm_property_create_enum(dev, 0, "COLOR_ENCODING", | |
439 | enum_list, len); | |
440 | if (!prop) | |
441 | return -ENOMEM; | |
442 | plane->color_encoding_property = prop; | |
443 | drm_object_attach_property(&plane->base, prop, default_encoding); | |
444 | if (plane->state) | |
445 | plane->state->color_encoding = default_encoding; | |
446 | ||
447 | len = 0; | |
448 | for (i = 0; i < DRM_COLOR_RANGE_MAX; i++) { | |
449 | if ((supported_ranges & BIT(i)) == 0) | |
450 | continue; | |
451 | ||
452 | enum_list[len].type = i; | |
453 | enum_list[len].name = color_range_name[i]; | |
454 | len++; | |
455 | } | |
456 | ||
457 | prop = drm_property_create_enum(dev, 0, "COLOR_RANGE", | |
458 | enum_list, len); | |
459 | if (!prop) | |
460 | return -ENOMEM; | |
461 | plane->color_range_property = prop; | |
462 | drm_object_attach_property(&plane->base, prop, default_range); | |
463 | if (plane->state) | |
464 | plane->state->color_range = default_range; | |
465 | ||
466 | return 0; | |
467 | } | |
468 | EXPORT_SYMBOL(drm_plane_create_color_properties); | |
3c8861d8 MR |
469 | |
470 | /** | |
471 | * drm_color_lut_check - check validity of lookup table | |
472 | * @lut: property blob containing LUT to check | |
473 | * @tests: bitmask of tests to run | |
474 | * | |
475 | * Helper to check whether a userspace-provided lookup table is valid and | |
476 | * satisfies hardware requirements. Drivers pass a bitmask indicating which of | |
477 | * the tests in &drm_color_lut_tests should be performed. | |
478 | * | |
479 | * Returns 0 on success, -EINVAL on failure. | |
480 | */ | |
5a3db6f0 | 481 | int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests) |
3c8861d8 | 482 | { |
5a3db6f0 | 483 | const struct drm_color_lut *entry; |
3c8861d8 MR |
484 | int i; |
485 | ||
486 | if (!lut || !tests) | |
487 | return 0; | |
488 | ||
489 | entry = lut->data; | |
490 | for (i = 0; i < drm_color_lut_size(lut); i++) { | |
491 | if (tests & DRM_COLOR_LUT_EQUAL_CHANNELS) { | |
492 | if (entry[i].red != entry[i].blue || | |
493 | entry[i].red != entry[i].green) { | |
494 | DRM_DEBUG_KMS("All LUT entries must have equal r/g/b\n"); | |
495 | return -EINVAL; | |
496 | } | |
497 | } | |
498 | ||
499 | if (i > 0 && tests & DRM_COLOR_LUT_NON_DECREASING) { | |
500 | if (entry[i].red < entry[i - 1].red || | |
501 | entry[i].green < entry[i - 1].green || | |
502 | entry[i].blue < entry[i - 1].blue) { | |
503 | DRM_DEBUG_KMS("LUT entries must never decrease.\n"); | |
504 | return -EINVAL; | |
505 | } | |
506 | } | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
511 | EXPORT_SYMBOL(drm_color_lut_check); |