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When setting plane degamma TF via AMD driver-specific color properties, the driver uses PRE_DEGAM color block (ROM). However, this block cannot be used with subsampled formats as it affects the linearity of color space in which HW scaler operates. For subsampled format, use the AMD color module to map plane degamma predefined curve to LUT and use GAMCOR block instead (RAM). This is based on Harry's implementation for Fixed Matrix Colorop. Link: https://lore.kernel.org/dri-devel/20260330153451.99472-1-harry.wentland@amd.com/ Co-developed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Harry Wentland <harry.wentland@amd.com> Tested-by: Matthew Schwartz <matthew.schwartz@linux.dev> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>