drm/i915: Swap primary planes on gen2 for FBC
Only plane A is FBC capable on gen2 (like gen3), but the panel fitter is hooked up to pipe B, so we want to prefer pipe B + plane A. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> [danvet: Add the code comment Chris requested in his review.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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