drm/i915/vlv: disable PPGTT on early revs v3
Early revs didn't have PPGTT support, so disable there.
v2: add debug msg when disabling on early stepping
v3: enable on other B3 packages as well (untested) (Ville)
References: https://bugs.freedesktop.org/show_bug.cgi?id=79669
References: https://bugs.freedesktop.org/show_bug.cgi?id=79670
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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