gma500: introduce the framebuffer support code
We support 2D acceleration on some devices but we try and do tricks with the GTT as a starting point as this is far faster. The GTT logic could be improved further but for most display sizes it already makes a pretty good decision. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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