2 * Copyright (c) 2016 Intel Corporation
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
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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.
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
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23 #ifndef __DRM_COLOR_MGMT_H__
24 #define __DRM_COLOR_MGMT_H__
26 #include <linux/ctype.h>
27 #include <linux/math64.h>
28 #include <drm/drm_property.h>
34 * drm_color_lut_extract - clamp and round LUT entries
35 * @user_input: input value
36 * @bit_precision: number of bits the hw LUT supports
38 * Extract a degamma/gamma LUT value provided by user (in the form of
39 * &drm_color_lut entries) and round it to the precision supported by the
42 static inline u32 drm_color_lut_extract(u32 user_input, int bit_precision)
45 u32 max = 0xffff >> (16 - bit_precision);
47 /* Round only if we're not using full precision. */
48 if (bit_precision < 16) {
49 val += 1UL << (16 - bit_precision - 1);
50 val >>= 16 - bit_precision;
53 return clamp_val(val, 0, max);
56 u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n);
58 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
59 uint degamma_lut_size,
63 int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
67 * drm_color_lut_size - calculate the number of entries in the LUT
68 * @blob: blob containing the LUT
71 * The number of entries in the color LUT stored in @blob.
73 static inline int drm_color_lut_size(const struct drm_property_blob *blob)
75 return blob->length / sizeof(struct drm_color_lut);
78 enum drm_color_encoding {
79 DRM_COLOR_YCBCR_BT601,
80 DRM_COLOR_YCBCR_BT709,
81 DRM_COLOR_YCBCR_BT2020,
82 DRM_COLOR_ENCODING_MAX,
85 enum drm_color_range {
86 DRM_COLOR_YCBCR_LIMITED_RANGE,
87 DRM_COLOR_YCBCR_FULL_RANGE,
91 int drm_plane_create_color_properties(struct drm_plane *plane,
92 u32 supported_encodings,
94 enum drm_color_encoding default_encoding,
95 enum drm_color_range default_range);
97 int drm_plane_create_chroma_siting_properties(struct drm_plane *plane,
98 int32_t default_chroma_siting_h, int32_t default_chroma_siting_v);
101 * enum drm_color_lut_tests - hw-specific LUT tests to perform
103 * The drm_color_lut_check() function takes a bitmask of the values here to
104 * determine which tests to apply to a userspace-provided LUT.
106 enum drm_color_lut_tests {
108 * @DRM_COLOR_LUT_EQUAL_CHANNELS:
110 * Checks whether the entries of a LUT all have equal values for the
111 * red, green, and blue channels. Intended for hardware that only
112 * accepts a single value per LUT entry and assumes that value applies
113 * to all three color components.
115 DRM_COLOR_LUT_EQUAL_CHANNELS = BIT(0),
118 * @DRM_COLOR_LUT_NON_DECREASING:
120 * Checks whether the entries of a LUT are always flat or increasing
121 * (never decreasing).
123 DRM_COLOR_LUT_NON_DECREASING = BIT(1),
126 int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests);