drm/vc4: Modesetting fixes

From: Eric Anholt
Date: Tue Feb 16 2016 - 16:20:48 EST


This series fixes the highest priority problems reported from the
driver getting enabled in Raspbian: modesetting on HDMI was broken if
you weren't at the same resolution that the firmware had set up, or if
the firmware hadn't set up HDMI at all.