[coreboot-gerrit] Change in coreboot[master]: ec/google/chromeec: Add APIs for USB-C DP ALT mode

[Derek Huang (Code Review)]

Attention is currently required from: Paul Menzel, Tim Wawrzynczak, Brandon Breitenstein, Curtis Chen.
Hello build bot (Jenkins), Furquan Shaikh, Tim Wawrzynczak, Zhuohao Lee, Brandon Breitenstein, Curtis Chen,

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

https://review.coreboot.org/c/coreboot/+/57138

to look at the new patch set (#16).

Change subject: ec/google/chromeec: Add APIs for USB-C DP ALT mode
......................................................................

ec/google/chromeec: Add APIs for USB-C DP ALT mode

Add API to allow AP to send the command to EC to enter DP ALT mode
and API to wait for DP HPD event.

BUG=b:192947843
TEST=select ENABLE_TCSS_DISPLAY_DETECTION in Kconfig.name. Build
coreboot and update your system. Boot the system you will find below
message in the coreboot log with or without USB-C display connected:
'HPD ready after %lu ms' or 'HPD not ready after %ldms. Abort.'.

Signed-off-by: Derek Huang 
Change-Id: Id11510c1ff58579ae2cddfe5a4d69646fd84f5c3
---
M src/ec/google/chromeec/ec.c
M src/ec/google/chromeec/ec.h
2 files changed, 54 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/38/57138/16