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Frame-packing modes add an extra vtotal raster lines to each frame above and beyond what the basic mode description calls for. Account for this during scaler configuration (possibly a bit of a hack), during CRTC configuration (clearly not a hack), and when checking that a mode is valid for a given connector (cribbed from the i915 driver). Signed-off-by: Alastair Bridgewater <alastair.bridgewater@gmail.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>