Commit edc2b74a authored by Ville Syrjälä's avatar Ville Syrjälä
Browse files

drm/i915: Adjust LUT rounding rules 



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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013131402.24072-3-ville.syrjala@linux.intel.com


Reviewed-by: default avatarChaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
parent c6fbb6bc

drivers/gpu/drm/i915/display/intel_color.c

+6 −8
Original line number Diff line number Diff line
@@ -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)