drm/amdgpu: Don't register backlight when another backlight should be used (v3)

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Before this commit when we want userspace to use the acpi_video backlight
device we register both the GPU's native backlight device and acpi_video's
firmware acpi_video# backlight device. This relies on userspace preferring
firmware type backlight devices over native ones.

Registering 2 backlight devices for a single display really is
undesirable, don't register the GPU's native backlight device when
another backlight device should be used.

Changes in v2:
- To avoid linker errors when amdgpu is builtin and video_detect.c is in
  a module, select ACPI_VIDEO and its deps if ACPI is enabled.
  When ACPI is disabled, ACPI_VIDEO is also always disabled, ensuring
  the stubs from acpi/video.h will be used.

Changes in v3:
- Use drm_info(drm_dev, "...") to log messages
- ACPI_VIDEO can now be enabled on non X86 too,
  adjust the Kconfig changes to match this.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

...

This commit is contained in:

Hans de Goede 2022-04-15 22:22:41 +02:00

parent b1d36e73cc

commit da11ef8329

3 changed files with 21 additions and 0 deletions

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7

drivers/gpu/drm/Kconfig

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7

drivers/gpu/drm/amd/amdgpu/atombios_encoders.c

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7

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

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