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The black level is likely to get updated, if ever, only after exposure or gain changes. Don't compute its possible updates if exposure and gain are unchanged. It's probably not worth trying to implement something more sophisticated. Better to spend the effort on supporting tuning files. Signed-off-by: Milan Zamazal <mzamazal@redhat.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>