[S] Change in coreboot[master]: soc/mediatek/common: Reset the watchdog timer before triggering reset

[KuanHsun Cheng (Code Review)]

Attention is currently required from: Hung-Te Lin, KuanHsun Cheng, Allen-KH Cheng, Yidi Lin.

Hello Hung-Te Lin, Allen-KH Cheng, Yu-Ping Wu, Yidi Lin,

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

https://review.coreboot.org/c/coreboot/+/71754

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

Change subject: soc/mediatek/common: Reset the watchdog timer before triggering reset
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soc/mediatek/common: Reset the watchdog timer before triggering reset

When the watchdog timer reaches 0, the timer value won't reset to the
default value unless there is an external reset or a kick. It will
result in the watchdog failing to trigger the reset signal.

We kick the watchdog to reset the timer to the default value. Also, add
a 100 us delay before triggering the reset signal.

BUG=b:264003005, b:264017048
BRANCH=corsola
TEST= Reboot successfully with the following cmd
      stop daisydog
      sleep 60 > /dev/watchdog&

Signed-off-by: Runyang Chen 
Signed-off-by: Allen-kh Cheng 
Change-Id: Ic4964103d54910c4a1e675b59c362e93c2213b19
---
M src/soc/mediatek/common/include/soc/wdt_common.h
M src/soc/mediatek/common/wdt.c
2 files changed, 32 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/54/71754/3