diff options
| author | David S. Miller <davem@davemloft.net> | 2018-12-20 21:53:28 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-20 22:53:36 +0300 |
| commit | 2be09de7d6a06f58e768de1255a687c9aaa66606 (patch) | |
| tree | 298f9e04caf105873d987e807eccba27710a49cc /drivers/tty/serial/8250/8250_port.c | |
| parent | 44a7b3b6e3a458f9549c2cc28e74ecdc470e42f1 (diff) | |
| parent | 1d51b4b1d3f2db0d6d144175e31a84e472fbd99a (diff) | |
| download | linux-2be09de7d6a06f58e768de1255a687c9aaa66606.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Lots of conflicts, by happily all cases of overlapping
changes, parallel adds, things of that nature.
Thanks to Stephen Rothwell, Saeed Mahameed, and others
for their guidance in these resolutions.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/tty/serial/8250/8250_port.c')
| -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); |