1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
From b85078591bed8f2359bf04c7f77818d8877387c5 Mon Sep 17 00:00:00 2001
From: Vitaly Prosyak <vitaly.prosyak@amd.com>
Date: Thu, 10 May 2018 12:37:35 -0500
Subject: [PATCH 4543/5725] drm/amd/display: HLG support
Low level calculation methods.
Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
drivers/gpu/drm/amd/display/dc/dc.h | 2 +
.../drm/amd/display/modules/color/color_gamma.c | 137 +++++++++++++++++++++
2 files changed, 139 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 693d828..cf076a6 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -378,6 +378,8 @@ enum dc_transfer_func_predefined {
TRANSFER_FUNCTION_PQ,
TRANSFER_FUNCTION_LINEAR,
TRANSFER_FUNCTION_UNITY,
+ TRANSFER_FUNCTION_HLG,
+ TRANSFER_FUNCTION_HLG12
};
struct dc_transfer_func {
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
index e803b37..fa9a199 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -131,6 +131,63 @@ static void compute_de_pq(struct fixed31_32 in_x, struct fixed31_32 *out_y)
dc_fixpt_div(dc_fixpt_one, m1));
}
+
+/*de gamma, none linear to linear*/
+static void compute_hlg_oetf(struct fixed31_32 in_x, bool is_light0_12, struct fixed31_32 *out_y)
+{
+ struct fixed31_32 a;
+ struct fixed31_32 b;
+ struct fixed31_32 c;
+ struct fixed31_32 threshold;
+ struct fixed31_32 reference_white_level;
+
+ a = dc_fixpt_from_fraction(17883277, 100000000);
+ if (is_light0_12) {
+ /*light 0-12*/
+ b = dc_fixpt_from_fraction(28466892, 100000000);
+ c = dc_fixpt_from_fraction(55991073, 100000000);
+ threshold = dc_fixpt_one;
+ reference_white_level = dc_fixpt_half;
+ } else {
+ /*light 0-1*/
+ b = dc_fixpt_from_fraction(2372241, 100000000);
+ c = dc_fixpt_add(dc_fixpt_one, dc_fixpt_from_fraction(429347, 100000000));
+ threshold = dc_fixpt_from_fraction(1, 12);
+ reference_white_level = dc_fixpt_pow(dc_fixpt_from_fraction(3, 1), dc_fixpt_half);
+ }
+ if (dc_fixpt_lt(threshold, in_x))
+ *out_y = dc_fixpt_add(c, dc_fixpt_mul(a, dc_fixpt_log(dc_fixpt_sub(in_x, b))));
+ else
+ *out_y = dc_fixpt_mul(dc_fixpt_pow(in_x, dc_fixpt_half), reference_white_level);
+}
+
+/*re gamma, linear to none linear*/
+static void compute_hlg_eotf(struct fixed31_32 in_x, bool is_light0_12, struct fixed31_32 *out_y)
+{
+ struct fixed31_32 a;
+ struct fixed31_32 b;
+ struct fixed31_32 c;
+ struct fixed31_32 reference_white_level;
+
+ a = dc_fixpt_from_fraction(17883277, 100000000);
+ if (is_light0_12) {
+ /*light 0-12*/
+ b = dc_fixpt_from_fraction(28466892, 100000000);
+ c = dc_fixpt_from_fraction(55991073, 100000000);
+ reference_white_level = dc_fixpt_from_fraction(4, 1);
+ } else {
+ /*light 0-1*/
+ b = dc_fixpt_from_fraction(2372241, 100000000);
+ c = dc_fixpt_add(dc_fixpt_one, dc_fixpt_from_fraction(429347, 100000000));
+ reference_white_level = dc_fixpt_from_fraction(1, 3);
+ }
+ if (dc_fixpt_lt(dc_fixpt_half, in_x))
+ *out_y = dc_fixpt_add(dc_fixpt_exp(dc_fixpt_div(dc_fixpt_sub(in_x, c), a)), b);
+ else
+ *out_y = dc_fixpt_mul(dc_fixpt_pow(in_x, dc_fixpt_from_fraction(2, 1)), reference_white_level);
+}
+
+
/* one-time pre-compute PQ values - only for sdr_white_level 80 */
void precompute_pq(void)
{
@@ -691,6 +748,48 @@ static void build_degamma(struct pwl_float_data_ex *curve,
}
}
+static void build_hlg_degamma(struct pwl_float_data_ex *degamma,
+ uint32_t hw_points_num,
+ const struct hw_x_point *coordinate_x, bool is_light0_12)
+{
+ uint32_t i;
+
+ struct pwl_float_data_ex *rgb = degamma;
+ const struct hw_x_point *coord_x = coordinate_x;
+
+ i = 0;
+
+ while (i != hw_points_num + 1) {
+ compute_hlg_oetf(coord_x->x, is_light0_12, &rgb->r);
+ rgb->g = rgb->r;
+ rgb->b = rgb->r;
+ ++coord_x;
+ ++rgb;
+ ++i;
+ }
+}
+
+static void build_hlg_regamma(struct pwl_float_data_ex *regamma,
+ uint32_t hw_points_num,
+ const struct hw_x_point *coordinate_x, bool is_light0_12)
+{
+ uint32_t i;
+
+ struct pwl_float_data_ex *rgb = regamma;
+ const struct hw_x_point *coord_x = coordinate_x;
+
+ i = 0;
+
+ while (i != hw_points_num + 1) {
+ compute_hlg_eotf(coord_x->x, is_light0_12, &rgb->r);
+ rgb->g = rgb->r;
+ rgb->b = rgb->r;
+ ++coord_x;
+ ++rgb;
+ ++i;
+ }
+}
+
static void scale_gamma(struct pwl_float_data *pwl_rgb,
const struct dc_gamma *ramp,
struct dividers dividers)
@@ -1615,6 +1714,25 @@ bool mod_color_calculate_curve(enum dc_transfer_func_predefined trans,
ret = true;
kvfree(rgb_regamma);
+ } else if (trans == TRANSFER_FUNCTION_HLG ||
+ trans == TRANSFER_FUNCTION_HLG12) {
+ rgb_regamma = kvzalloc(sizeof(*rgb_regamma) *
+ (MAX_HW_POINTS + _EXTRA_POINTS),
+ GFP_KERNEL);
+ if (!rgb_regamma)
+ goto rgb_regamma_alloc_fail;
+
+ build_hlg_regamma(rgb_regamma,
+ MAX_HW_POINTS,
+ coordinates_x,
+ trans == TRANSFER_FUNCTION_HLG12 ? true:false);
+ for (i = 0; i <= MAX_HW_POINTS ; i++) {
+ points->red[i] = rgb_regamma[i].r;
+ points->green[i] = rgb_regamma[i].g;
+ points->blue[i] = rgb_regamma[i].b;
+ }
+ ret = true;
+ kvfree(rgb_regamma);
}
rgb_regamma_alloc_fail:
return ret;
@@ -1675,6 +1793,25 @@ bool mod_color_calculate_degamma_curve(enum dc_transfer_func_predefined trans,
ret = true;
kvfree(rgb_degamma);
+ } else if (trans == TRANSFER_FUNCTION_HLG ||
+ trans == TRANSFER_FUNCTION_HLG12) {
+ rgb_degamma = kvzalloc(sizeof(*rgb_degamma) *
+ (MAX_HW_POINTS + _EXTRA_POINTS),
+ GFP_KERNEL);
+ if (!rgb_degamma)
+ goto rgb_degamma_alloc_fail;
+
+ build_hlg_degamma(rgb_degamma,
+ MAX_HW_POINTS,
+ coordinates_x,
+ trans == TRANSFER_FUNCTION_HLG12 ? true:false);
+ for (i = 0; i <= MAX_HW_POINTS ; i++) {
+ points->red[i] = rgb_degamma[i].r;
+ points->green[i] = rgb_degamma[i].g;
+ points->blue[i] = rgb_degamma[i].b;
+ }
+ ret = true;
+ kvfree(rgb_degamma);
}
points->end_exponent = 0;
points->x_point_at_y1_red = 1;
--
2.7.4
|
