drm/amd/display: Test ISM idle exit arms

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[WHAT]
Add KUnit tests for the OPTIMIZED_IDLE and OPTIMIZED_IDLE_SSO
previous-state arms of dm_ism_dispatch_power_state().

[HOW]
Cascade into each idle state, post EXIT_IDLE_REQUESTED, then check
that idle is disallowed and the idle period recorded.

These arms run on a state departure rather than on entry, so a single
event cannot reach them; the FSM has to occupy the idle state first.
Driving both steps through amdgpu_dm_ism_commit_event() keeps the test
on the real path instead of calling the dispatcher directly.

Both arms end in FULL_POWER_RUNNING and both disallow idle, so the
state alone does not tell them apart. Asserting ism->next_record_idx
pins the side effect that matters: the idle period is added to the
hysteresis history on the way out.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@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 2026-08-14 16:48:59 -06:00 • committed by Alex Deucher

parent 4066b56704

commit 04dc311c38

1 changed files with 84 additions and 0 deletions

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

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