MTL onwards Degamma LUT/PRE-CSC LUT precision has been increased from 16 bits to 24 bits. Currently, drm framework only supports LUTs up to 16 bit precision. Until a new uapi comes along to support higher bitdepth, upscale the values sent from userland to 24 bit before writing into the HW to continue supporting degamma on MTL. To avoid pipe config mismatch between 24 bit HW lut values and 16 bit userspace sent values, convert back the 24 bit lut values read from HW to 16 bit values. Chaitanya Kumar Borah (2): drm/i915/color: Add function to load degamma LUT in MTL drm/i915/color: For MTL convert 24 bit lut values to 16 bit drivers/gpu/drm/i915/display/intel_color.c | 50 +++++++++++++++++++++- 1 file changed, 48 insertions(+), 2 deletions(-) -- 2.25.1
