drm/amd/display: Add legacy plane LUT tests

[WHY]
The legacy plane color path did not exercise successful shaper, 3D
LUT, and blend LUT programming as a single transaction.

[HOW]
Provide valid legacy LUT blobs and verify that all three plane
color-management stages are enabled.

Assisted-by: Copilot:GPT-5.6-Sol
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Hung 2026-07-14 15:22:36 -06:00 • committed by Alex Deucher
commit b99214c2d8