[M] Change in coreboot[main]: mb/google/brya/var/xol: Configure power limits by battery status

[SH Kim (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eric Lai, Jamie Chen, Kapil Porwal, Nick Vaccaro, SH Kim, Sumeet R Pawnikar.

Hello Dinesh Gehlot, Eric Lai, Jamie Chen, Kapil Porwal, Nick Vaccaro, Subrata Banik, Sumeet R Pawnikar,

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

https://review.coreboot.org/c/coreboot/+/81614?usp=email

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

Change subject: mb/google/brya/var/xol: Configure power limits by battery status
......................................................................

mb/google/brya/var/xol: Configure power limits by battery status

When battery level is below critical level or battery is not present,
cpus need to run with a power optimized configuration to avoid platform
instabilities such as system power down.

This will check the current battery status and configure cpu power
limits using current PD power value.

BUG=b:328729536
TEST=built and veified MSR PL2/PL4 values using PTAT.

Original power limit configuration for Xol:
MSR PL2: 55W, MSR PL4: 114W.

[When connected 60W adaptor without battery]
Before:
MSR PL2: 55W, MSR PL4: 114W
After:
MSR PL2: 55W, MSR PL4: 60W

[When connected 45W adaptor without battery]
Before:
MSR PL2: 55W, MSR PL4: 114W
After:
MSR PL2: 45W, MSR PL4: 45W

Change-Id: I5d71e9edde0ecbd7aaf316cd754a6ebcff9da77d
Signed-off-by: Seunghwan Kim 
---
M src/mainboard/google/brya/variants/baseboard/brya/ramstage.c
M src/mainboard/google/brya/variants/baseboard/include/baseboard/variants.h
M src/mainboard/google/brya/variants/xol/Makefile.mk
A src/mainboard/google/brya/variants/xol/ramstage.c
4 files changed, 65 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/14/81614/3