tree d0ab034df3f86fa1a25a0d776c5a7e0b162b3562
parent 6c10d367eb169cc3f07053785fd000b382874672
author Nico Huber <nico.h@gmx.de> 1569919069 +0200
committer Nico Huber <nico.h@gmx.de> 1570372788 +0000

gma ilk: Handle Ibex Peak DP correctly

We missed some bits specific to Ibex Peak DPs. Namely, the training
pattern selection moved and we have to select the transcoder in the
`DP_CTL` register as there is no separate DP transcoder register.

The latter is quirky, however. If a port (DP or HDMI) is disabled
with the second transcoder selected. This selection sticks and the
sibling port (e.g. DP2 to HDMI2) can't be enabled with the first
transcoder. As a workaround, we are supposed to enable a port that
was using the second transcoder with the first transcoder selected
again.

Change-Id: I0c1fafc2ba113aeeaf4ace750b333cc270bca37c
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/35740
Reviewed-by: Angel Pons <th3fanbus@gmail.com>