drm/i915: Split cursor check_plane into i845 and i9xx variants
The 845/865 and 830/855/9xx+ style cursor don't have that much in common with each other, so let's just split the .check_plane() hook into two variants as well. v2: Keep the common stuff in one place (Chris) v3: s/DRM_FORMAT_MOD_NONE/DRM_FORMAT_MOD_LINEAR/ Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> #v1 Link: http://patchwork.freedesktop.org/patch/msgid/20170327185546.2977-9-ville.syrjala@linux.intel.com
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