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647d1fd046
Add KUnit tests for six pure-logic functions in amdgpu_dm_color.c: amdgpu_dm_fixpt_from_s3132, __is_lut_linear, __drm_ctm_to_dc_matrix, __drm_ctm_3x4_to_dc_matrix, amdgpu_tf_to_dc_tf, and amdgpu_colorop_tf_to_dc_tf. Expose these static functions under CONFIG_DRM_AMD_DC_KUNIT_TEST and add a new amdgpu_dm_color.h header with the KUnit-only prototypes. The test file re-declares the dc and amdgpu transfer function enums locally to avoid pulling in the full DC/amdgpu include chain that fails under UML. 26 test cases cover signed-magnitude to two's complement conversion, LUT linearity detection, CTM-to-DC matrix conversion, and transfer function enum mapping. Assisted-by: Copilot:Claude-Opus-4.6 Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Ivan Lipski <ivan.lipski@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>