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This moves the pre-gen4 check from update() to enable(). The HAS_DDI in the original code is not needed since only gen 2/3 have the plane swapping code. v2: Rebase. v3: Extract fbc_on_plane_a_only() (Chris). Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/