drm/amd/display: Test backlight level readback path

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[WHAT]
Add KUnit coverage for the backlight level read path.

A faked link_service vtable returns canned PWM and AUX brightness values,
letting the tests verify both the successful readback and the
DC_ERROR/AUX-failure fallbacks to the cached brightness, plus the
get_brightness() device-index wrapper.

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 18:39:36 -06:00 • committed by Alex Deucher

parent ee486cb800

commit c50a4305df

3 changed files with 164 additions and 3 deletions

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9

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

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2

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

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156

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

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