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Currently the driver always writes DPTSR when setting up the hardware. However, writing the register is only meaningful when the second source for a plane is used, and the register is not even documented for SoCs that do not have the second source. So move the write behind a condition. Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Tested-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> # On R-Car M3-N Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241217-rcar-gh-dsi-v5-2-e77421093c05@ideasonboard.com