521 	struct circ_buf *xmit = &sport->port.state->xmit;  in imx_uart_transmit_buffer()  local
531 	if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {  in imx_uart_transmit_buffer()
555 	while (!uart_circ_empty(xmit) &&  in imx_uart_transmit_buffer()
559 		imx_uart_writel(sport, xmit->buf[xmit->tail], URTX0);  in imx_uart_transmit_buffer()
563 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)  in imx_uart_transmit_buffer()
566 	if (uart_circ_empty(xmit))  in imx_uart_transmit_buffer()
574 	struct circ_buf *xmit = &sport->port.state->xmit;  in imx_uart_dma_tx_callback()  local
592 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)  in imx_uart_dma_tx_callback()
595 	if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))  in imx_uart_dma_tx_callback()
609 	struct circ_buf *xmit = &sport->port.state->xmit;  in imx_uart_dma_tx()  local
624 	sport->tx_bytes = uart_circ_chars_pending(xmit);  in imx_uart_dma_tx()
626 	if (xmit->tail < xmit->head || xmit->head == 0) {  in imx_uart_dma_tx()
628 		sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);  in imx_uart_dma_tx()
632 		sg_set_buf(sgl, xmit->buf + xmit->tail,  in imx_uart_dma_tx()
633 				UART_XMIT_SIZE - xmit->tail);  in imx_uart_dma_tx()
634 		sg_set_buf(sgl + 1, xmit->buf, xmit->head);  in imx_uart_dma_tx()
654 			uart_circ_chars_pending(xmit));  in imx_uart_dma_tx()
673 	if (!sport->port.x_char && uart_circ_empty(&port->state->xmit))  in imx_uart_start_tx()
744 		if (!uart_circ_empty(&port->state->xmit) &&  in imx_uart_start_tx()