linux-kernel - [PATCH v2 3/6] atmel_serial: Use existing console options only if BRG is running

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Message-Id: <1198077130-9021-4-git-send-email-hskinnemoen@atmel.com>
Date:	Wed, 19 Dec 2007 16:12:07 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Andrew Victor <linux@...im.org.za>
Cc:	Remy Bohmer <linux@...mer.net>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, kernel@...32linux.org,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: [PATCH v2 3/6] atmel_serial: Use existing console options only if BRG is running

If BRGR is zero, the baud rate generator isn't running, so the boot
loader can't have initialized the port.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
---
 drivers/serial/atmel_serial.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index 61d71b0..a6b3828 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -842,13 +842,13 @@ static void __init atmel_console_get_options(struct uart_port *port, int *baud,
 {
 	unsigned int mr, quot;
 
-// TODO: CR is a write-only register
-//	unsigned int cr;
-//
-//	cr = UART_GET_CR(port) & (ATMEL_US_RXEN | ATMEL_US_TXEN);
-//	if (cr == (ATMEL_US_RXEN | ATMEL_US_TXEN)) {
-//		/* ok, the port was enabled */
-//	}
+	/*
+	 * If the baud rate generator isn't running, the port wasn't
+	 * initialized by the boot loader.
+	 */
+	quot = UART_GET_BRGR(port);
+	if (!quot)
+		return;
 
 	mr = UART_GET_MR(port) & ATMEL_US_CHRL;
 	if (mr == ATMEL_US_CHRL_8)
@@ -868,7 +868,6 @@ static void __init atmel_console_get_options(struct uart_port *port, int *baud,
 	 * lower than one of those, as it would make us fall through
 	 * to a much lower baud rate than we really want.
 	 */
-	quot = UART_GET_BRGR(port);
 	*baud = port->uartclk / (16 * (quot - 1));
 }
 
-- 
1.5.3.4

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