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 23#ifndef __DRM_COLOR_MGMT_H__ 24#define __DRM_COLOR_MGMT_H__ 25 26#include <linux/ctype.h> 27#include <linux/math64.h> 28#include <drm/drm_property.h> 29 30struct drm_crtc; 31struct drm_plane; 32 33/** 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 37 * 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 40 * hardware, following OpenGL int<->float conversion rules 41 * (see eg. OpenGL 4.6 specification - 2.3.5 Fixed-Point Data Conversions). 42 */ 43static inline u32 drm_color_lut_extract(u32 user_input, int bit_precision) 44{ 45 if (bit_precision > 16) 46 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(user_input, (1 << bit_precision) - 1), 47 (1 << 16) - 1); 48 else 49 return DIV_ROUND_CLOSEST(user_input * ((1 << bit_precision) - 1), 50 (1 << 16) - 1); 51} 52 53u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n); 54 55void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc, 56 uint degamma_lut_size, 57 bool has_ctm, 58 uint gamma_lut_size); 59 60int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc, 61 int gamma_size); 62 63/** 64 * drm_color_lut_size - calculate the number of entries in the LUT 65 * @blob: blob containing the LUT 66 * 67 * Returns: 68 * The number of entries in the color LUT stored in @blob. 69 */ 70static inline int drm_color_lut_size(const struct drm_property_blob *blob) 71{ 72 return blob->length / sizeof(struct drm_color_lut); 73} 74 75enum drm_color_encoding { 76 DRM_COLOR_YCBCR_BT601, 77 DRM_COLOR_YCBCR_BT709, 78 DRM_COLOR_YCBCR_BT2020, 79 DRM_COLOR_ENCODING_MAX, 80}; 81 82enum drm_color_range { 83 DRM_COLOR_YCBCR_LIMITED_RANGE, 84 DRM_COLOR_YCBCR_FULL_RANGE, 85 DRM_COLOR_RANGE_MAX, 86}; 87 88int drm_plane_create_color_properties(struct drm_plane *plane, 89 u32 supported_encodings, 90 u32 supported_ranges, 91 enum drm_color_encoding default_encoding, 92 enum drm_color_range default_range); 93 94/** 95 * enum drm_color_lut_tests - hw-specific LUT tests to perform 96 * 97 * The drm_color_lut_check() function takes a bitmask of the values here to 98 * determine which tests to apply to a userspace-provided LUT. 99 */ 100enum drm_color_lut_tests { 101 /** 102 * @DRM_COLOR_LUT_EQUAL_CHANNELS: 103 * 104 * Checks whether the entries of a LUT all have equal values for the 105 * red, green, and blue channels. Intended for hardware that only 106 * accepts a single value per LUT entry and assumes that value applies 107 * to all three color components. 108 */ 109 DRM_COLOR_LUT_EQUAL_CHANNELS = BIT(0), 110 111 /** 112 * @DRM_COLOR_LUT_NON_DECREASING: 113 * 114 * Checks whether the entries of a LUT are always flat or increasing 115 * (never decreasing). 116 */ 117 DRM_COLOR_LUT_NON_DECREASING = BIT(1), 118}; 119 120int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests); 121#endif 122