[coreboot-gerrit] Change in coreboot[master]: mb/google/octopus/var/fleex: Disable XHCI LFPS power management by sku

[EricR Lai (Code Review)]

Hello build bot (Jenkins), Henry Sun, Marco Chen, Ivy Jian, Karthik Ramasubramanian,

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

https://review.coreboot.org/c/coreboot/+/46868

to look at the new patch set (#4).

Change subject: mb/google/octopus/var/fleex: Disable XHCI LFPS power management by sku
......................................................................

mb/google/octopus/var/fleex: Disable XHCI LFPS power management by sku

LTE module Fibocom L850-GL is lost after idle overnight,
with this workaround, host will not initiate U3 wakeup
at the same time with device, which will avoid the race condition.

If this option is set in the devicetree, the bits[7:4] in XHCI MMIO BAR +
offset 0x80A4 (PMCTRL_REG) will be updated from default 9 to 0.

BUG=b:169645448
BRANCH=octopus
TEST=build coreboot with DisableXhciLfpsPM being set to 1 and flash
     the image to the device. Run following command to check if
     bits[7:4] is set 0:
     >iotools mmio_read32 "XHCI MMIO BAR + 0x80A4"

Signed-off-by: Eric Lai 
Change-Id: I3a04320b0e2441dce540a5afdc461f12de45c41b
---
M src/mainboard/google/octopus/variants/fleex/overridetree.cb
M src/mainboard/google/octopus/variants/fleex/variant.c
2 files changed, 15 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/68/46868/4