695 	struct circ_buf *xmit = &port->state->xmit;  in stm32_usart_transmit_chars_pio()  local
697 	while (!uart_circ_empty(xmit)) {  in stm32_usart_transmit_chars_pio()
701 		writel_relaxed(xmit->buf[xmit->tail], port->membase + ofs->tdr);  in stm32_usart_transmit_chars_pio()
706 	if (uart_circ_empty(xmit))  in stm32_usart_transmit_chars_pio()
715 	struct circ_buf *xmit = &port->state->xmit;  in stm32_usart_transmit_chars_dma()  local
727 	count = uart_circ_chars_pending(xmit);  in stm32_usart_transmit_chars_dma()
732 	if (xmit->tail < xmit->head) {  in stm32_usart_transmit_chars_dma()
733 		memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], count);  in stm32_usart_transmit_chars_dma()
735 		size_t one = UART_XMIT_SIZE - xmit->tail;  in stm32_usart_transmit_chars_dma()
742 		memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], one);  in stm32_usart_transmit_chars_dma()
744 			memcpy(&stm32port->tx_buf[one], &xmit->buf[0], two);  in stm32_usart_transmit_chars_dma()
791 	struct circ_buf *xmit = &port->state->xmit;  in stm32_usart_transmit_chars()  local
798 	     !(uart_circ_empty(xmit) || uart_tx_stopped(port)))) {  in stm32_usart_transmit_chars()
825 	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {  in stm32_usart_transmit_chars()
840 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)  in stm32_usart_transmit_chars()
843 	if (uart_circ_empty(xmit)) {  in stm32_usart_transmit_chars()
974 	struct circ_buf *xmit = &port->state->xmit;  in stm32_usart_start_tx()  local
976 	if (uart_circ_empty(xmit) && !port->x_char) {  in stm32_usart_start_tx()