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drm/i915/color: Downscale degamma lut values read from hardware

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For MTL and beyond, convert back the 24 bit lut values
read from HW to 16 bit values to maintain parity with
userspace values. This way we avoid pipe config mismatch
for pre-csc lut values.

v2: Add helper function to downscale values (Jani)

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230725083002.3779717-3-chaitanya.kumar.borah@intel.com
This commit is contained in:
Chaitanya Kumar Borah 2023-07-25 14:00:02 +05:30 committed by Ankit Nautiyal
parent 435cbb0b0e
commit 14c8fca214
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/display/intel_color.c
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@ -3456,6 +3456,14 @@ static struct drm_property_blob *glk_read_degamma_lut(struct intel_crtc *crtc)
for (i = 0; i < lut_size; i++) {
u32 val = intel_de_read_fw(dev_priv, PRE_CSC_GAMC_DATA(pipe));
/*
* For MTL and beyond, convert back the 24 bit lut values
* read from HW to 16 bit values to maintain parity with
* userspace values
*/
if (DISPLAY_VER(dev_priv) >= 14)
val = change_lut_val_precision(val, 16, 24);
lut[i].red = val;
lut[i].green = val;
lut[i].blue = val;