XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP
reg = dma_read(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP);
dma_write(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP,
XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP) &