diff options
| author | Haavard Skinnemoen <haavard.skinnemoen@atmel.com> | 2008-07-16 22:52:46 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-21 02:12:34 +0200 |
| commit | 9afd561acabe5059ff16d163a176e2350269aba5 (patch) | |
| tree | fdc8dd1e97c2aff22eb708c8695be58c21b97af9 /drivers | |
| parent | Subject: [PATCH 1/2] serial: Add flush_buffer() operation to uart_ops (diff) | |
| download | linux-9afd561acabe5059ff16d163a176e2350269aba5.tar.xz linux-9afd561acabe5059ff16d163a176e2350269aba5.zip | |
Subject: [PATCH 2/2] atmel_serial: Implement flush_buffer() hook
Avoid dumping garbage to the serial port when the tty is flushed. This
tends to happen when rebooting from a serial console.
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/serial/atmel_serial.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c index 6aeef22bd203..c17fcd6085f3 100644 --- a/drivers/serial/atmel_serial.c +++ b/drivers/serial/atmel_serial.c @@ -956,6 +956,20 @@ static void atmel_shutdown(struct uart_port *port) } /* + * Flush any TX data submitted for DMA. Called when the TX circular + * buffer is reset. + */ +static void atmel_flush_buffer(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (atmel_use_dma_tx(port)) { + UART_PUT_TCR(port, 0); + atmel_port->pdc_tx.ofs = 0; + } +} + +/* * Power / Clock management. */ static void atmel_serial_pm(struct uart_port *port, unsigned int state, @@ -1189,6 +1203,7 @@ static struct uart_ops atmel_pops = { .break_ctl = atmel_break_ctl, .startup = atmel_startup, .shutdown = atmel_shutdown, + .flush_buffer = atmel_flush_buffer, .set_termios = atmel_set_termios, .type = atmel_type, .release_port = atmel_release_port, |