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drm: Add helper to extract lut from struct drm_color_lut32 

Add helper to extract lut values in 32-bit precision needed by
hardware.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Sebastian Wick <sebastian.wick@redhat.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patch.msgid.link/20251115000237.3561250-37-alex.hung@amd.com
pull/1354/merge
Chaitanya Kumar Borah 2025-11-14 17:02:01 -07:00 committed by Simon Ser
parent 621c45ca12
commit 9452977513
1 changed files with 16 additions and 0 deletions
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16
include/drm/drm_color_mgmt.h
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@ -50,6 +50,22 @@ static inline u32 drm_color_lut_extract(u32 user_input, int bit_precision)
(1 << 16) - 1);
}
/**
* drm_color_lut32_extract - clamp and round LUT entries
* @user_input: input value
* @bit_precision: number of bits the hw LUT supports
*
* Extract U0.bit_precision from a U0.32 LUT value.
*
*/
static inline u32 drm_color_lut32_extract(u32 user_input, int bit_precision)
{
u64 max = (bit_precision >= 64) ? ~0ULL : (1ULL << bit_precision) - 1;
return DIV_ROUND_CLOSEST_ULL((u64)user_input * max,
(1ULL << 32) - 1);
}
u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n);
void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,