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On some scenes, win lite area may flush with short width. As the Technical Reference Manual description, need enable axi outstanding function if use IOMMU. From testing, after setting axi outstanding max number to 30 solve windows flush problem. Change-Id: Id4ea7b5f5dae334e88cf1fb106c0b7bc6af9b8d0 Signed-off-by: Mark Yao <mark.yao@rock-chips.com>