The existing framerate/vblank calculations did not account for the sensor mode limits. This commit extracts vblank limits from the sensor v4l2 controls, and stores it in the camera modes structure. Exposure and vblank value calculations now use values clamped to the sensor mode limits. The libcamera::controls::FrameDurations metadata return values now reflect the minimum and maximum after clamping. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>