SPRD_UART_RX_SIZE
sp->rx_dma.virt = dma_alloc_coherent(sp->port.dev, SPRD_UART_RX_SIZE,
dma_free_coherent(sp->port.dev, SPRD_UART_RX_SIZE,
sp->rx_dma.trans_len = SPRD_UART_RX_SIZE +
sp->rx_dma.trans_len = SPRD_UART_RX_SIZE +
return sprd_uart_dma_submit(port, &sp->rx_dma, SPRD_UART_RX_SIZE,