[M] Change in libgfxinit[main]: gma tgl: Add port detection

[Nico Huber (Code Review)]

Attention is currently required from: Angel Pons, Dinesh Gehlot, Nick Vaccaro, Nico Huber, Tarun Tuli, Tim Wawrzynczak.

Nico Huber has uploaded a new patch set (#40) to the change originally created by Tim Wawrzynczak. ( https://review.coreboot.org/c/libgfxinit/+/67500?usp=email )

The following approvals got outdated and were removed:
Code-Review+1 by Angel Pons

Change subject: gma tgl: Add port detection
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gma tgl: Add port detection

Block TCCOLD during initialization so that Modular FIA registers can be
accessed.  Instead of keeping track of the state of TCCOLD all of the
time (and enabling and re-enabling), this patch just blocks TCCOLD
once during initializaton and leaves it that way.

We don't have any knowledge yet if a TC port is used in legacy DP/HDMI
mode or not, so we always handle hotplug events in both hardware blocks.

Signed-off-by: Tim Wawrzynczak 
Change-Id: I674e7c2dcd7738e3d76266ff36675dbd52fa5ae2
---
M common/tigerlake/hw-gfx-gma-port_detect.adb
1 file changed, 146 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/00/67500/40