drm/i915: don't use the first stolen page on Broadwell
The spec says we just can't use it. v2: - Add WA name (Ville). - Add a big comment explaining that we still didn't fix the problem where we inherit a framebuffer on the first page (Chris, Ville). Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Acked-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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