drm/amd/display: multi-eDP backlight support

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[why]
Currently the assumption is that we are using a single eDP
connector so there will only be one backlight object. Need changes
to allow brightness update and reading for multiple eDP connectors.

[how]
- register a single device
- turn backlight link from a pointer to an array of pointers
- update brightness of all eDP links at the same time when request
is registered
- read brightness level only of the primary eDP panel
- turn current_backlight_pwm and targer_backlight_pwm debugfs enteries
into per connector enteries.

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Wayne Lin <waynelin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Mikita Lipski 2021-04-14 14:51:02 -04:00 • committed by Alex Deucher

parent f50160cf0f

commit 118b4627d6

3 changed files with 82 additions and 52 deletions

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42

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

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6

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

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86

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

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