linux-kernel - [PATCH] OMAP: UART: Fix the revision register read.

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Message-ID: <1373268537-3198-1-git-send-email-oleksandr.savchenko@ti.com>
Date:	Mon, 8 Jul 2013 10:28:57 +0300
From:	Alexander Savchenko <oleksandr.savchenko@...com>
To:	<gregkh@...uxfoundation.org>, <jslaby@...e.cz>
CC:	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Ruchika Kharwar <ruchika@...com>,
	Alexander Savchenko <oleksandr.savchenko@...com>
Subject: [PATCH] OMAP: UART: Fix the revision register read.

From: Ruchika Kharwar <ruchika@...com>

The revision register is a 32 bit register. The serial_in() function reads
only the lower 16 bits of the register. This leads to an incorrect computation
of the Module revision.

Signed-off-by: Ruchika Kharwar <ruchika@...com>
[oleksandr.savchenko@...com: add some whitespaces]
Signed-off-by: Alexander Savchenko <oleksandr.savchenko@...com>
---
 drivers/tty/serial/omap-serial.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index ad7b366..a23bbdb 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1335,7 +1335,7 @@ static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
 	u32 mvr, scheme;
 	u16 revision, major, minor;
 
-	mvr = serial_in(up, UART_OMAP_MVER);
+	mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
 
 	/* Check revision register scheme */
 	scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
-- 
1.7.9.5

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