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The hardware requires the HDSR and VDSR registers to be set to 1 or higher. This translates to a minimum combined horizontal sync and back porch of 20 pixels and a minimum vertical back porch of 3 lines. Reject modes that fail those requirements. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>