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drm/amd/display: Add KUnit tests for amdgpu_dm_backlight

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Add KUnit tests for the backlight helpers in amdgpu_dm_backlight.c.

Tests cover:
- amdgpu_dm_update_backlight_caps(): short-circuit on populated caps
  and default value assignment
- get_brightness_range(): NULL, PWM-only, and AUX backlight paths
- convert_brightness_to_user(): minimum clamp, maximum passthrough,
  and mid-range rescaling
- convert_brightness_from_user(): linear rescaling, AUX path, and
  custom-curve mapping
- convert_custom_brightness(): exact match, below-first, interpolation,
  above-last, single data point, zero lower luminance, and the
  debug-mask and no-data-point guards
- amdgpu_dm_update_connector_ext_caps(): negative bl_idx and non-eDP
  early returns, OLED defaults, luminance range copy, and the
  amdgpu_backlight force-AUX/force-PWM overrides
- amdgpu_dm_should_create_sysfs(): forced ABM, non-eDP, missing
  backlight index, and AUX vs PWM backlight
- amdgpu_dm_setup_backlight_device(): non-eDP/LVDS skip, disconnected
  link skip, eDP-count limit, and the successful eDP setup path

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: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Hung 2026-04-29 20:57:54 -06:00 • committed by Alex Deucher
commit 179b22085e
4 changed files with 1210 additions and 9 deletions
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