drm/amd/display: Cover MST-start failure in detect_mst

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Add a KUnit test for amdgpu_dm_detect_mst_link_for_all_connectors() where
an MST branch fails to start its topology manager. A powered-down aux
forces drm_dp_mst_topology_mgr_set_mst() to fail on its initial DPCD read,
exercising the error path that downgrades the link and stops the manager.

Assisted-by: Copilot:Claude-Opus-4.8
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Bhawanpreet Lakha <bhawanpreet.lakha@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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Bhawanpreet Lakha 2026-07-29 15:30:52 -04:00 • committed by Alex Deucher

parent 985c7177f6

commit 662f3e9757

1 changed files with 49 additions and 0 deletions

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

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