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it use vb2_dma_contig_memops as default mem_ops in csi driver drivers/media/platform/mxc/capture/mx6s_capture.c still not upstream to linux community. q->mem_ops = &vb2_dma_contig_memops; mem_ops is need in videobuf2-core.c to operate dma buffer. videobuf2-dma-contig.c is common code which have no hardware involved Bug: 160195378 Signed-off-by: zhang sanshan <pete.zhang@nxp.com> Change-Id: Ib084ff96bd4f92aa36f8abb8d4b62a0e9be62e6c