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 <derek.huang@intel.corp-partner.google.com>
Change-Id: Id11510c1ff58579ae2cddfe5a4d69646fd84f5c3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57138
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
c0bd123408