drm/amd/display: Extract backlight helpers for KUnit tests

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[WHAT]
Extract shared backlight device index lookup and property
setup into testable helpers. The duplicated bd-to-index
scan in update_status/get_brightness is replaced by
amdgpu_dm_backlight_get_device_index(), and the inline
backlight_properties calculation is replaced by
amdgpu_dm_backlight_fill_props().

Add KUnit coverage for both new helpers. Keep the runtime
power_supply_is_system_supplied() call at the caller so
the helpers remain pure and deterministic under test.

Assisted-by: Copilot:GPT-5.5
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>

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Alex Hung 2026-06-12 17:20:27 -06:00 • committed by Alex Deucher

parent 7a39b1c3b2

commit 703e3ae756

3 changed files with 184 additions and 31 deletions

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84

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

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8

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

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123

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

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