drm/amd/display: Test dm_dp_mst_get_modes with a remote EDID

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[WHAT]
Add KUnit tests for dm_dp_mst_get_modes() covering the paths taken once
an EDID is available: a placeholder virtual sink is released and replaced
by a real remote sink, DC refusing that sink returns zero modes, the
content protection state is restored from the HDCP workqueue, and an EDID
read from a port still in the topology is cached with MST_REMOTE_EDID
flagged.

[HOW]
The tests reuse the MST downstream connector fixture and feed it a
minimal EDID base block. For the remote read the fixture topology gains a
branch device holding the port so drm_dp_mst_edid_read() can validate it
and return the cached EDID.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@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>

...

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Alex Hung 2026-08-12 12:52:56 -06:00 • committed by Alex Deucher

parent 1c33290e72

commit 5b6118ce64

1 changed files with 160 additions and 0 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_mst_types_test.c

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