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PD#SWPL-9254 Problem: uncached display unexpectly. Solution: Technically, calling dma_buf_map_attachment should return a buffer properly dma_mapped. Add calls to dma_map_sg to begin_cpu_access to ensure this happens. As a side effect, this lets Ion buffers take advantage of the dma_buf sync ioctls. Verify: galilei, franklin Change-Id: Ib6ca06e59e81031d3c65c2df8824b46baaba6c9f Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jiyu Yang <Jiyu.Yang@amlogic.com>