Edward O'Callaghan uploaded patch set #3 to this change.

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mainboard/hatch: Fix puff display on cold boots

Similar to that of b:72387533 however our DP&HDMI are beind a MST.

Some Type-C monitors do not immediately assert HPD. If we continue
to boot without HPD asserted, Depthcharge fails to show pictures
on a monitor even if HPD is asserted later.

Also, if an HDMI monitor is connected, no wait is needed. If only
an HDMI monitor is connected, currently the API always loops until
the stopwatch expires.

This patch will make the AP skip DisplayPort wait loop if it detects
an HDMI monitor. And if an HDMI monitor is not detected, the AP will
wait for DisplayPort mode (like before) but also its HPD signal.

This patch also extends the wait loop time-out to 3 seconds.

BUG=b:147992492
BRANCH=none
TEST=Verify firmware screen is displayed even when a type-c monitor
does not immediately assert HPD. Verify if HDMI monitor is connected,
AP does not wait (and firmware screen is displayed on HDMI monitor).

Change-Id: I19d40056e58f1737f87fd07d62b07a723a63d610
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
---
M src/mainboard/google/hatch/variants/puff/mainboard.c
1 file changed, 42 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/38475/3

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