Change in coreboot[master]: mb/google/dedede/var/bugzzy: Initialize display signals on user mode

[shkim (Code Review)]

Attention is currently required from: shkim, Henry Sun, Paul Menzel, Simon Yang, Edward Doan, Karthik Ramasubramanian.
Hello build bot (Jenkins), Henry Sun, SH Kim, Simon Yang, Edward Doan, Karthik Ramasubramanian,

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

https://review.coreboot.org/c/coreboot/+/60190

to look at the new patch set (#9).

Change subject: mb/google/dedede/var/bugzzy: Initialize display signals on user mode
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mb/google/dedede/var/bugzzy: Initialize display signals on user mode

Bugzzy uses panel-built-in touch screen, it needs to set panel power
and reset signal to high for touch screen to work.

On user mode, coreboot doesn't initialize graphics since there is no
screen display before OS. So we would add a WA to initialize required
signals on user mode. It takes about 100 ms delay on booting time.

BUG=b:205496327
BRANCH=dedede
TEST=Verified touch screen worked with test coreboot
     and test touch screen 028D firmware

Signed-off-by: Seunghwan Kim 
Change-Id: Iaa4d16deb932f43ae1ab33ff5b4e74120ab670db
---
M src/mainboard/google/dedede/variants/bugzzy/Makefile.inc
A src/mainboard/google/dedede/variants/bugzzy/ramstage.c
2 files changed, 68 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/60190/9