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drm/komeda: Add drm_lut_to_fgamma_coeffs() 

This function is used to convert drm color lut to komeda HW required curve
coeffs values.

Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Mihail Atanassov <mihail.atanassov@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191112110927.20931-3-james.qian.wang@arm.com
This commit is contained in:
james qian wang (Arm Technology China) 2019-11-12 11:10:09 +00:00
parent 7ca7fcef13
commit c2b13c650f
2 changed files with 60 additions and 1 deletions
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52
drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
View File

@ -65,3 +65,55 @@ const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
return coeffs;
}
struct gamma_curve_sector {
u32 boundary_start;
u32 num_of_segments;
u32 segment_width;
};
struct gamma_curve_segment {
u32 start;
u32 end;
};
static struct gamma_curve_sector sector_tbl[] = {
{ 0, 4, 4 },
{ 16, 4, 4 },
{ 32, 4, 8 },
{ 64, 4, 16 },
{ 128, 4, 32 },
{ 256, 4, 64 },
{ 512, 16, 32 },
{ 1024, 24, 128 },
};
static void
drm_lut_to_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs,
struct gamma_curve_sector *sector_tbl, u32 num_sectors)
{
struct drm_color_lut *lut;
u32 i, j, in, num = 0;
if (!lut_blob)
return;
lut = lut_blob->data;
for (i = 0; i < num_sectors; i++) {
for (j = 0; j < sector_tbl[i].num_of_segments; j++) {
in = sector_tbl[i].boundary_start +
j * sector_tbl[i].segment_width;
coeffs[num++] = drm_color_lut_extract(lut[in].red,
KOMEDA_COLOR_PRECISION);
}
}
coeffs[num] = BIT(KOMEDA_COLOR_PRECISION);
}
void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs)
{
drm_lut_to_coeffs(lut_blob, coeffs, sector_tbl, ARRAY_SIZE(sector_tbl));
}

9
drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
View File

@ -11,7 +11,14 @@
#include <drm/drm_color_mgmt.h>
#define KOMEDA_N_YUV2RGB_COEFFS 12
#define KOMEDA_N_RGB2YUV_COEFFS 12
#define KOMEDA_COLOR_PRECISION 12
#define KOMEDA_N_GAMMA_COEFFS 65
#define KOMEDA_COLOR_LUT_SIZE BIT(KOMEDA_COLOR_PRECISION)
#define KOMEDA_N_CTM_COEFFS 9
void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs);
const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range);
#endif
#endif /*_KOMEDA_COLOR_MGMT_H_*/