tree 563f4ac70236f0024832d1b7b6764a785d9c27af
parent adf70c65cff66d843d66469dbe13ef1ed21e062b
author Paulo Zanoni <paulo.r.zanoni@intel.com> 1442254797 -0300
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1443011957 +0200

drm/i915: avoid the last 8mb of stolen on BDW/SKL

The FBC hardware for these platforms doesn't have access to the
bios_reserved range, so it always assumes the maximum (8mb) is used.
So avoid this range while allocating.

This solves a bunch of FIFO underruns that happen if you end up
putting the CFB in that memory range. On my machine, with 32mb of
stolen, I need a 2560x1440 mode for that.

Testcase: igt/kms_frontbuffer_tracking/fbc-* (given the right setup)
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>