gma: Implement Ivy Bridge VGA plane workaround

It's a documented requirement, even though it doesn't seem necessary.

Change-Id: Id4f579c1ca34633ee00c771b39e6ff45cdcfbf69
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/17277
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
3 files changed
tree: 800db7e4028ed730b7c4c10d08e0252062fd5eae
  1. common/
  2. configs/
  3. .gitignore
  4. COPYING
  5. Makefile
  6. Makefile.inc
  7. TODO