drm/amd/display: test native cursor mode on a disabled CRTC

[why]
Upstream has no KUnit coverage for amdgpu_dm_crtc_get_cursor_mode(),
which is why the fix in the previous commit came with no test. The
disabled-CRTC path is easy to regress again: it has already been lost
once to a refactor.

[how]
Add a test whose plane setup would otherwise select overlay mode, and
check that a disabled CRTC still reports native mode. Reverting the
previous commit makes only this test fail.

Reviewed-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: James Lin <pinglei.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tom Chung 2026-08-07 13:22:03 +08:00 • committed by Alex Deucher
commit 22183b73a0