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When iommu itself is disabled in dts, we should fallback to non-iommu buffer, check iommu parent is meanless here. Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20210627084737.309163-1-andy.yan@rock-chips.com