drm/amd/display: Test backlight level programming path

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[WHAT]
Add KUnit coverage for the backlight level write path in
amdgpu_dm_backlight.c.

Tests cover stream lookup hit/miss, the connector-off and no-stream early
returns, and the AUX/PWM/idle-reallow programming branches. The DC
programming calls stay safe by injecting a NULL power module and keeping
idle optimizations a no-op via disable_idle_power_optimizations.

Assisted-by: Copilot:Claude-Opus-4.8
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Alex Hung 2026-06-29 18:37:52 -06:00 • committed by Alex Deucher

parent 9a77c86ec8

commit ee486cb800

3 changed files with 272 additions and 2 deletions

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9

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

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5

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

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260

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

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