linux-kernel - [PATCH 2/2] atmel_serial: Implement flush

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Date:	Mon, 30 Jun 2008 12:24:21 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	kernel@...32linux.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Victor <linux@...im.org.za>,
	Chip Coldwell <coldwell@...hat.com>,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
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@...el.com>
---
 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 42be8b0..7691f42 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,
-- 
1.5.5.4

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