drm/amd/display: Test MST stream feature read failure

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[WHAT]
Add a KUnit test for dm_helpers_mst_enable_stream_features() that fails
the DP_DOWNSPREAD_CTRL read.

The helper must bail out without writing the register back, which covers
the early return on a failed DPCD read.

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 2026-08-11 14:04:55 -06:00 • committed by Alex Deucher

parent cc8cf8b6d9

commit 5507d498d7

1 changed files with 33 additions and 0 deletions

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

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