drm/amd/display: Test writeback state transitions

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[Why]
Add KUnit tests for dm_clear_writeback() removing stream writeback
state and dm_set_writeback() leaving a job unarmed when no DC pipe
matches.

[How]
Use the real DC removal helper with a state-only update_bandwidth
fake, and construct the minimal DRM writeback objects needed to reach
the no-pipe cleanup path.

Assisted-by: Copilot:Claude-Opus-5 GPT-5.6 Sol
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ray Wu <ray.wu@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 2026-08-14 13:02:38 -06:00 • committed by Alex Deucher

parent 11f8fe9480

commit 82acfaa6ca

3 changed files with 94 additions and 7 deletions

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17

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

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7

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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77

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

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