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With runtime PM the hw might still be off while doing the ->mode_set callbacks - runtime PM get/put should only happen in the enable/disable hooks to properly support DPMS. Which essentially makes these callbacks useless for drivers support runtime PM, so make them optional. Again motivated by discussions with Laurent. Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>