drm/i915: Remove some duplicated plane swapping logic
On pre-gen4 we connect plane A to pipe B and vice versa to get an FBC capable plane feeding the LVDS port by default. We have the logic for the plane swapping duplicated in many places. Let's remove a bit of the duplication by having the crtc look up the thing from the primary plane. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1478616439-10150-2-git-send-email-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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