tree db7a0ac45dc47f88b68f5789b6acc844ead51636
parent 8469b0089aa06fe196e23a2853d81d661cd21de8
author Nico Huber <nico.h@gmx.de> 1569616341 +0200
committer Nico Huber <nico.h@gmx.de> 1571402442 +0000

gma: Automatically update CDClk and dot clocks

Dot clocks should be limited, depending on CDClk. This comes with a
caveat: if a display only works at a specific refresh rate, we will
likely fail without knowing. It seems to be better, though, to try
at least. We can implement a config switch controlling this beha-
viour, later, if needed.

If we can raise / lower CDClk with a given set of dot clocks, we
have to disable all pipes first, then switch CDClk, and finally
enable all pipes with their new configuration.

Calling Update_Outputs() with all pipe configs disabled may disable
the CDClk. So we have to ensure it is enabled when trying to probe
for displays.

Change-Id: I375f2bd37c921cd5ed4b0094247df5a34a087188
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/35719
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>