Change in coreboot[master]: soc/intel/tigerlake: Hook up GMA ACPI brightness controls

[Tim Crawford (Code Review)]

Attention is currently required from: Tim Crawford, Tim Wawrzynczak, Michael Niewöhner.
Hello build bot (Jenkins), Matt DeVillier, Tim Wawrzynczak, Michael Niewöhner,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/57823

to look at the new patch set (#3).

Change subject: soc/intel/tigerlake: Hook up GMA ACPI brightness controls
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soc/intel/tigerlake: Hook up GMA ACPI brightness controls

Add function needed to generate ACPI backlight control SSDT, along with
Kconfig values for accessing the registers.

Tested by adding gfx register on system76/gaze16 and booting Windows.
Display settings has a brightness setting, and can change the brightness
level.

Change-Id: Id8b14c0b4a7a681dc6cb95778c12a006a7e31373
Signed-off-by: Tim Crawford 
---
M src/soc/intel/tigerlake/Kconfig
M src/soc/intel/tigerlake/Makefile.inc
M src/soc/intel/tigerlake/chip.h
A src/soc/intel/tigerlake/graphics.c
4 files changed, 28 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/23/57823/3