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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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Vitaly Prosyak 2018-05-10 12:37:35 -05:00 committed by Alex Deucher
parent 1a05873f21
commit 43610a9be1
2 changed files with 139 additions and 0 deletions
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2
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -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 {

137
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
View File

@ -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)
@ -1614,6 +1713,25 @@ 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:
@ -1674,6 +1792,25 @@ 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;