drm/i915: Use i9xx_check_plane_surface() for sprite planes as well
All the pre-SKL sprite planes compute the x/y/tile offsets in a similar way. There are a couple of minor differences but the primary planes have those as well. Thus i9xx_check_plane_surface() already does what we need, so let's use it. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170323192712.30682-7-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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