[M] Change in coreboot[main]: mb/google/brox: Fix booting to kernel without battery

[Sowmya Aralguppe (Code Review)]

Attention is currently required from: Eric Herrmann, Forest Mittelberg, Kapil Porwal, Karthik Ramasubramanian, Keith Short, Nick Vaccaro, Rishika Raj, Shelley Chen, Sowmya Aralguppe, Subrata Banik.

Hello Caveh Jalali, Dinesh Gehlot, Eric Herrmann, Forest Mittelberg, Kapil Porwal, Karthik Ramasubramanian, Keith Short, Nick Vaccaro, Rishika Raj, Shelley Chen, Subrata Banik,

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

https://review.coreboot.org/c/coreboot/+/83752?usp=email

to look at the new patch set (#5).

Change subject: mb/google/brox: Fix booting to kernel without battery
......................................................................

mb/google/brox: Fix booting to kernel without battery

When battery is disconnected and only adaptor is connected higher PL2
power draw causes cpu brown out and system does not boot to kernel. To
avoid this set Boot frequency UPD to 1.Reduce PL4 value to overcome
power spikes from SoC during boot. Remove Psys implementation as it
impacts active state platform performance. For boot with battery
increase PL1 min value to 15 watts.

BUG=b:335046538,b:329722827
BRANCH=None
TEST=Able to successfully boot on 3 different Brox proto2 SKU1
     and SKU2 boards with 65W, 45W and 30W adaptors for 3
     iterations of cold boot.

Change-Id: I58e136c607ea9290ecac0cee453d6632760a6433
Signed-off-by: Sowmya Aralguppe 
---
M src/mainboard/google/brox/variants/baseboard/brox/ramstage.c
M src/mainboard/google/brox/variants/brox/ramstage.c
M src/soc/intel/alderlake/romstage/fsp_params.c
3 files changed, 59 insertions(+), 104 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/52/83752/5