diff options
| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2013-09-05 17:34:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-26 14:27:24 -0700 |
| commit | 2797f6fb6727d8ac5127f88aee1fd059db0be24b (patch) | |
| tree | 073d000be0dea568b0da673a79e7f6a1f34ac211 | |
| parent | 52592da32b85e8be7e6ab534059b9457b3dea4e5 (diff) | |
serial: 8250: don't change the fifo trigger level when using dma
DMA engines usually expect the fifo trigger level to be
aligned with the burst size. It should not be changed even
with small baud rates. This will fix an issue with
Designware DMA engine where the data can not be transferred
over UART with lower baud rates then 2400.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 570df9d2a5d..e33d38cb170 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2322,7 +2322,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { fcr = uart_config[port->type].fcr; - if (baud < 2400 || fifo_bug) { + if ((baud < 2400 && !up->dma) || fifo_bug) { fcr &= ~UART_FCR_TRIGGER_MASK; fcr |= UART_FCR_TRIGGER_1; } |