[coreboot-gerrit] Change in coreboot[master]: drivers/system76/dgpu: Add driver for System76 switchable graphics

[Tim Crawford (Code Review)]

Attention is currently required from: Tim Crawford, Benjamin Doron.
Tim Crawford has uploaded a new patch set (#6) to the change originally created by Jeremy Soller. ( https://review.coreboot.org/c/coreboot/+/43615 )

Change subject: drivers/system76/dgpu: Add driver for System76 switchable graphics
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drivers/system76/dgpu: Add driver for System76 switchable graphics

This adds a driver for System76 systems with switchable NVIDIA
graphics. The driver provides ACPI support for dynamically
powering on and off the GPU, a function for enabling the GPU
power in the bootblock, and a hook in ramstage for moving GPU
prefetch resources above 4 GiB.

Tested on system76/gaze15 and system76/oryp6.

Change-Id: I05833e88457bfc3612cc9a8cbf1eec68dcfc5566
Signed-off-by: Jeremy Soller 
Signed-off-by: Tim Crawford 
---
A src/drivers/system76/dgpu/Kconfig
A src/drivers/system76/dgpu/Makefile.inc
A src/drivers/system76/dgpu/acpi/dgpu.asl
A src/drivers/system76/dgpu/bootblock.c
A src/drivers/system76/dgpu/ramstage.c
5 files changed, 330 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/15/43615/6