[XS] Change in coreboot[main]: soc/mediatek/mt8196: Fix RTC recovery by disabling external XTAL

[Jarried Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Jarried Lin.

Hello Hung-Te Lin, Yidi Lin, Yu-Ping Wu, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/86353?usp=email

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

Change subject: soc/mediatek/mt8196: Fix RTC recovery by disabling external XTAL
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soc/mediatek/mt8196: Fix RTC recovery by disabling external XTAL

Configure PMIC register 0x50c bit0 which decides whether to use external
xtal. This bit of mt6685 should be set to 1, to disable external xtal.

BRANCH=rauru
BUG=b:395485005
TEST=emerge-rauru coreboot chromeos-bootimage, remove battery and
charger, then insert battery and charge, RTC boots normally.

Signed-off-by: Shunxi Zhang 
Change-Id: Iea44f13af030f24c02993dd43a35a9d8b4f72179
---
M src/soc/mediatek/mt8196/mt6685_rtc.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/53/86353/2