VID_A_DMA_CTL
cx_write(VID_A_DMA_CTL, 0);
cx_set(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
cx_clear(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
cx_clear(VID_A_DMA_CTL, 0x11);
cx_set(VID_A_DMA_CTL, 0x11); /* FIFO and RISC enable */
cx_clear(VID_A_DMA_CTL, 0x11);