diff options
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 29 |
1 files changed, 5 insertions, 24 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index f776b3eafb96..3f779d25ec0c 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -552,30 +552,11 @@ static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) */ static void serial8250_clear_fifos(struct uart_8250_port *p) { - unsigned char fcr; - unsigned char clr_mask = UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT; - if (p->capabilities & UART_CAP_FIFO) { - /* - * Make sure to avoid changing FCR[7:3] and ENABLE_FIFO bits. - * In case ENABLE_FIFO is not set, there is nothing to flush - * so just return. Furthermore, on certain implementations of - * the 8250 core, the FCR[7:3] bits may only be changed under - * specific conditions and changing them if those conditions - * are not met can have nasty side effects. One such core is - * the 8250-omap present in TI AM335x. - */ - fcr = serial_in(p, UART_FCR); - - /* FIFO is not enabled, there's nothing to clear. */ - if (!(fcr & UART_FCR_ENABLE_FIFO)) - return; - - fcr |= clr_mask; - serial_out(p, UART_FCR, fcr); - - fcr &= ~clr_mask; - serial_out(p, UART_FCR, fcr); + serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO); + serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO | + UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); + serial_out(p, UART_FCR, 0); } } @@ -1467,7 +1448,7 @@ static void __do_stop_tx_rs485(struct uart_8250_port *p) * Enable previously disabled RX interrupts. */ if (!(p->port.rs485.flags & SER_RS485_RX_DURING_TX)) { - serial8250_clear_fifos(p); + serial8250_clear_and_reinit_fifos(p); p->ier |= UART_IER_RLSI | UART_IER_RDI; serial_port_out(&p->port, UART_IER, p->ier); |