drm/i915: Refactor the g4x TLB miss w/a to a helper
Pull the g4x TLB miss w/a calculation into a small helper. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170421181432.15216-10-ville.syrjala@linux.intel.comReviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
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