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drm/amd/display: add dc_fixpt_from_s3132 helper

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Detach value translation from CTM to reuse it for programming HDR
multiplier property.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Joshua Ashton <joshua@froggi.es>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Joshua Ashton 2023-11-16 18:58:01 -01:00 committed by Alex Deucher
parent ef113a3b19
commit 889044f9e0
2 changed files with 13 additions and 7 deletions
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8
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
View File

@ -405,7 +405,6 @@ static void __drm_lut_to_dc_gamma(const struct drm_color_lut *lut,
static void __drm_ctm_to_dc_matrix(const struct drm_color_ctm *ctm,
struct fixed31_32 *matrix)
{
int64_t val;
int i;
/*
@ -424,12 +423,7 @@ static void __drm_ctm_to_dc_matrix(const struct drm_color_ctm *ctm,
}
/* gamut_remap_matrix[i] = ctm[i - floor(i/4)] */
val = ctm->matrix[i - (i / 4)];
/* If negative, convert to 2's complement. */
if (val & (1ULL << 63))
val = -(val & ~(1ULL << 63));
matrix[i].value = val;
matrix[i] = dc_fixpt_from_s3132(ctm->matrix[i - (i / 4)]);
}
}

12
drivers/gpu/drm/amd/display/include/fixed31_32.h
View File

@ -69,6 +69,18 @@ static const struct fixed31_32 dc_fixpt_epsilon = { 1LL };
static const struct fixed31_32 dc_fixpt_half = { 0x80000000LL };
static const struct fixed31_32 dc_fixpt_one = { 0x100000000LL };
static inline struct fixed31_32 dc_fixpt_from_s3132(__u64 x)
{
struct fixed31_32 val;
/* If negative, convert to 2's complement. */
if (x & (1ULL << 63))
x = -(x & ~(1ULL << 63));
val.value = x;
return val;
}
/*
* @brief
* Initialization routines