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Commit 9afd561a authored by Haavard Skinnemoen's avatar Haavard Skinnemoen Committed by Linus Torvalds
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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: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6bb0e3a5

drivers/serial/atmel_serial.c

+15 −0
Original line number Diff line number Diff line
@@ -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,