[Intel-gfx] [PATCH 0/4] drm/i915: Some sanity checks for modes

[ville.syrjala at linux.intel.com]

I hit a div by zero due to accidentally passing in hdisplay=0, and that
got me looking a bit more at how much adjustment/verification we do to
display modes in general. The answer is not a lot.

So this series starts us off on the right track, and eliminates some
of the potential issues. There are still a lot of hardware specific
limits we don't handle (eg. minimum hblank length), but we have to start
somewhere.