1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
4 * Author: James.Qian.Wang <james.qian.wang@arm.com>
5 *
6 */
7
8 #include "komeda_color_mgmt.h"
9
10 /* 10bit precision YUV2RGB matrix */
11 static const s32 yuv2rgb_bt601_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
12 1192, 0, 1634,
13 1192, -401, -832,
14 1192, 2066, 0,
15 64, 512, 512
16 };
17
18 static const s32 yuv2rgb_bt601_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
19 1024, 0, 1436,
20 1024, -352, -731,
21 1024, 1815, 0,
22 0, 512, 512
23 };
24
25 static const s32 yuv2rgb_bt709_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
26 1192, 0, 1836,
27 1192, -218, -546,
28 1192, 2163, 0,
29 64, 512, 512
30 };
31
32 static const s32 yuv2rgb_bt709_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
33 1024, 0, 1613,
34 1024, -192, -479,
35 1024, 1900, 0,
36 0, 512, 512
37 };
38
39 static const s32 yuv2rgb_bt2020[KOMEDA_N_YUV2RGB_COEFFS] = {
40 1024, 0, 1476,
41 1024, -165, -572,
42 1024, 1884, 0,
43 0, 512, 512
44 };
45
komeda_select_yuv2rgb_coeffs(u32 color_encoding,u32 color_range)46 const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
47 {
48 bool narrow = color_range == DRM_COLOR_YCBCR_LIMITED_RANGE;
49 const s32 *coeffs;
50
51 switch (color_encoding) {
52 case DRM_COLOR_YCBCR_BT709:
53 coeffs = narrow ? yuv2rgb_bt709_narrow : yuv2rgb_bt709_wide;
54 break;
55 case DRM_COLOR_YCBCR_BT601:
56 coeffs = narrow ? yuv2rgb_bt601_narrow : yuv2rgb_bt601_wide;
57 break;
58 case DRM_COLOR_YCBCR_BT2020:
59 coeffs = yuv2rgb_bt2020;
60 break;
61 default:
62 coeffs = NULL;
63 break;
64 }
65
66 return coeffs;
67 }
68
69 struct gamma_curve_sector {
70 u32 boundary_start;
71 u32 num_of_segments;
72 u32 segment_width;
73 };
74
75 static struct gamma_curve_sector sector_tbl[] = {
76 { 0, 4, 4 },
77 { 16, 4, 4 },
78 { 32, 4, 8 },
79 { 64, 4, 16 },
80 { 128, 4, 32 },
81 { 256, 4, 64 },
82 { 512, 16, 32 },
83 { 1024, 24, 128 },
84 };
85
86 static void
drm_lut_to_coeffs(struct drm_property_blob * lut_blob,u32 * coeffs,struct gamma_curve_sector * sector_tbl,u32 num_sectors)87 drm_lut_to_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs,
88 struct gamma_curve_sector *sector_tbl, u32 num_sectors)
89 {
90 struct drm_color_lut *lut;
91 u32 i, j, in, num = 0;
92
93 if (!lut_blob)
94 return;
95
96 lut = lut_blob->data;
97
98 for (i = 0; i < num_sectors; i++) {
99 for (j = 0; j < sector_tbl[i].num_of_segments; j++) {
100 in = sector_tbl[i].boundary_start +
101 j * sector_tbl[i].segment_width;
102
103 coeffs[num++] = drm_color_lut_extract(lut[in].red,
104 KOMEDA_COLOR_PRECISION);
105 }
106 }
107
108 coeffs[num] = BIT(KOMEDA_COLOR_PRECISION);
109 }
110
drm_lut_to_fgamma_coeffs(struct drm_property_blob * lut_blob,u32 * coeffs)111 void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs)
112 {
113 drm_lut_to_coeffs(lut_blob, coeffs, sector_tbl, ARRAY_SIZE(sector_tbl));
114 }
115
drm_ctm_to_coeffs(struct drm_property_blob * ctm_blob,u32 * coeffs)116 void drm_ctm_to_coeffs(struct drm_property_blob *ctm_blob, u32 *coeffs)
117 {
118 struct drm_color_ctm *ctm;
119 u32 i;
120
121 if (!ctm_blob)
122 return;
123
124 ctm = ctm_blob->data;
125
126 for (i = 0; i < KOMEDA_N_CTM_COEFFS; i++)
127 coeffs[i] = drm_color_ctm_s31_32_to_qm_n(ctm->matrix[i], 3, 12);
128 }
129