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drm/i915: Adjust LUT rounding rules

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drm_color_lut_extract() rounding was changed to follow the
OpenGL int<->float conversion rules. Adjust intel_color_lut_pack()
to match.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013131402.24072-3-ville.syrjala@linux.intel.com
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2023-10-13 16:14:00 +03:00
parent c6fbb6bca1
commit edc2b74a53
1 changed files with 6 additions and 8 deletions
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14
drivers/gpu/drm/i915/display/intel_color.c
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@@ -785,14 +785,12 @@ static void chv_assign_csc(struct intel_crtc_state *crtc_state)
/* convert hw value with given bit_precision to lut property val */
static u32 intel_color_lut_pack(u32 val, int bit_precision)
{
u32 max = 0xffff >> (16 - bit_precision);
val = clamp_val(val, 0, max);
if (bit_precision < 16)
val <<= 16 - bit_precision;
return val;
if (bit_precision > 16)
return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(val, (1 << 16) - 1),
(1 << bit_precision) - 1);
else
return DIV_ROUND_CLOSEST(val * ((1 << 16) - 1),
(1 << bit_precision) - 1);
}
static u32 i9xx_lut_8(const struct drm_color_lut *color)