Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ea8dd8e5 authored by Soren Brinkmann's avatar Soren Brinkmann Committed by Greg Kroah-Hartman
Browse files

tty: xuartps: Don't consider circular buffer when enabling transmitter 



Restarting the transmitter even if the circ buffer is empty may be
necessary to push out remaining data when the port is restarted after
being stopped.

Cc: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarSoren Brinkmann <soren.brinkmann@xilinx.com>
Reviewed-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f0f54a80

drivers/tty/serial/xilinx_uartps.c

+4 −1
Original line number Diff line number Diff line
@@ -512,7 +512,7 @@ static void cdns_uart_start_tx(struct uart_port *port) 
{

	unsigned int status, numbytes = port->fifosize;



	if (uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port))

	if (uart_tx_stopped(port))

		return;



	/*
@@ -524,6 +524,9 @@ static void cdns_uart_start_tx(struct uart_port *port) 
	status |= CDNS_UART_CR_TX_EN;

	writel(status, port->membase + CDNS_UART_CR_OFFSET);



	if (uart_circ_empty(&port->state->xmit))

		return;



	while (numbytes-- && ((readl(port->membase + CDNS_UART_SR_OFFSET) &

				CDNS_UART_SR_TXFULL)) != CDNS_UART_SR_TXFULL) {

		/* Break if no more data available in the UART buffer */