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Currently we process page flip events on every display interrupt, however this does not take into consideration the processing time needed by the VSP1 utilised in the pipeline. Register a callback with the VSP driver to obtain completion events, and track them so that we only perform page flips when the full display pipeline has completed for the frame. Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>