[XS] Change in coreboot[master]: mb/google/nissa/var/uldren: Modify WWAN power sequence

[Dtrain Hsu (Code Review)]

Attention is currently required from: Dtrain Hsu, Shou-Chieh Hsu, Tarun Tuli.

Hello Derek Huang, Shou-Chieh Hsu, Tarun Tuli, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/75690?usp=email

to look at the new patch set (#2).

Change subject: mb/google/nissa/var/uldren: Modify WWAN power sequence
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mb/google/nissa/var/uldren: Modify WWAN power sequence

Follow spec[1] to modify WWAN power sequence. The WWAN power sequence
of warm reset is fail. The correct sequence is WWAN_EN should keep high when doing warm reset. Set GPP_D6 to PWROK which is not to do PAD
reset when warm reset.

[1]:
[JDB10] FC ADL-N_WWAN sequence_FM101-GL SDX12 Power Timing
Review_V1.6_20230602.xlsx

BUG=b:285065375
BRANCH=firmware-nissa-15217.B
TEST=1. emerge-nissa coreboot chromeos-bootimage
2. power sequence meets spec.

Change-Id: If59630dbd10e971c91e01f33a657c01d857bc0b9
Signed-off-by: Dtrain Hsu 
---
M src/mainboard/google/brya/variants/uldren/gpio.c
1 file changed, 1 insertion(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/75690/2