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drm/komeda: Add drm_ctm_to_coeffs()

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This function is for converting drm_color_ctm matrix to komeda hardware
required required Q2.12 2's complement CSC matrix.

v2:
  Move the fixpoint conversion function s31_32_to_q2_12() to drm core
  as a shared helper.

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/20191112110927.20931-4-james.qian.wang@arm.com
This commit is contained in:
james qian wang (Arm Technology China) 2019-11-12 11:10:18 +00:00
parent c2b13c650f
commit bb346b6642
2 changed files with 15 additions and 0 deletions
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14
drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
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@ -117,3 +117,17 @@ 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));
}
void drm_ctm_to_coeffs(struct drm_property_blob *ctm_blob, u32 *coeffs)
{
struct drm_color_ctm *ctm;
u32 i;
if (!ctm_blob)
return;
ctm = ctm_blob->data;
for (i = 0; i < KOMEDA_N_CTM_COEFFS; i++)
coeffs[i] = drm_color_ctm_s31_32_to_qm_n(ctm->matrix[i], 3, 12);
}

1
drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
View File

@ -18,6 +18,7 @@
#define KOMEDA_N_CTM_COEFFS 9
void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs);
void drm_ctm_to_coeffs(struct drm_property_blob *ctm_blob, u32 *coeffs);
const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range);