Change in coreboot[master]: soc/amd/stoneyridge/gpio.c: Create I2C slave reset code

[Richard Spiegel (Code Review)]

Hello build bot (Jenkins),

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

https://review.coreboot.org/28572

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

Change subject: soc/amd/stoneyridge/gpio.c: Create I2C slave reset code
......................................................................

soc/amd/stoneyridge/gpio.c: Create I2C slave reset code

AMD soc does not wait for I2C transaction to complete before executing a
reset. Because of this, it's possible for the reset to happen in the middle
of a transaction, resulting on a slave hang. There are 2 possible solutions:
If the slave has a reset pin connected to a GPIO pin, it can be used to
reset the slave, else the only solution is to bang SCL 9 times. Create code
that makes it easy to implement either solution.

BUG=b:114479395
TEST=Build and boot grunt.

Change-Id: I9a0bc00c55ecc8ec660c74794bee48302663e72b
Signed-off-by: Richard Spiegel 
---
M src/soc/amd/stoneyridge/gpio.c
M src/soc/amd/stoneyridge/include/soc/gpio.h
2 files changed, 108 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/72/28572/2