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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>
This commit is contained in:
Haavard Skinnemoen 2008-07-16 21:52:46 +01:00 committed by Linus Torvalds
parent 6bb0e3a59a
commit 9afd561aca
1 changed files with 15 additions and 0 deletions
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15
drivers/serial/atmel_serial.c
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@ -955,6 +955,20 @@ static void atmel_shutdown(struct uart_port *port)
atmel_close_hook(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.
*/
@ -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,