drm/i915: Fix glk+ degamma LUT conversions

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The current implementation of change_lut_val_precision() is just
a convoluted way of shifting by 8. Implement the proper rounding
by just using drm_color_lut_extract() and intel_color_lut_pack()
like everyone else does.

And as the uapi can't handle >=1.0 values but the hardware
can we need to clamp the results appropriately in the readout
path.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013131402.24072-5-ville.syrjala@linux.intel.com
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

...

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Ville Syrjälä 2023-10-13 16:14:02 +03:00

parent 5d76c8163f

commit deac453244

1 changed files with 28 additions and 26 deletions

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

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