[PATCH 0/4] Backlight fixes

[Alex Deucher <alexander.deucher@amd.com>]

This builds on the debugging and patches that Takashi did on the
bugs referenced in the patches.  It seems some latops claim to support
aux backlight control, but actually use the old pwm controller.

The code also currently warns in the backlight control function
if there is no pipe assigned, but this is a common case if the
display happens to be off when the backlight level is changed
and it just spams the logs, so remove it.

This set wires up the aux controller to the backlight control,
cleans up the code an bit, removes the assert, and adds an option
to override the backlight type.

@Display team, can you check if there are any quirks or differences
in the backlight control detection on windows?  Presumably this
is properly detected there. The systems in question claim to support
aux backlight control in their DPCDs, but that doesn't seem to work.

Alex Deucher (3):
  drm/amdgpu/display: simplify backlight setting
  drm/amdgpu/display: don't assert in set backlight function
  drm/amdgpu/display: handle aux backlight in backlight_get_brightness

Takashi Iwai (1):
  drm/amd/display: Add a backlight module option

 drivers/gpu/drm/amd/amdgpu/amdgpu.h           |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |  4 ++
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 49 +++++++++++--------
 drivers/gpu/drm/amd/display/dc/core/dc_link.c |  1 -
 4 files changed, 34 insertions(+), 21 deletions(-)

-- 
2.29.2

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