[3.8.y.z extended stable] Patch "can: flexcan: use correct clock as base for bit rate calculation" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    can: flexcan: use correct clock as base for bit rate calculation

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.15.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 699f24ad32342f64f51df98521131ab2de25a612 Mon Sep 17 00:00:00 2001
From: Marc Kleine-Budde <mkl at pengutronix.de>
Date: Mon, 25 Nov 2013 22:15:20 +0100
Subject: can: flexcan: use correct clock as base for bit rate calculation

commit 1a3e5173f5e72cbf7f0c8927b33082e361c16d72 upstream.

The flexcan IP core uses the peripheral clock ("per") as basic clock for the
bit timing calculation. However the driver uses the the wrong clock ("ipg").
This leads to wrong bit rates if the rates on both clock are different.

This patch fixes the problem by using the correct clock for the bit rate
calculation.

Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/net/can/flexcan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 4c90a27..b12fce6 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1010,7 +1010,6 @@ static int flexcan_probe(struct platform_device *pdev)
 			err = PTR_ERR(clk_ipg);
 			goto failed_clock;
 		}
-		clock_freq = clk_get_rate(clk_ipg);

 		clk_per = devm_clk_get(&pdev->dev, "per");
 		if (IS_ERR(clk_per)) {
@@ -1018,6 +1017,7 @@ static int flexcan_probe(struct platform_device *pdev)
 			err = PTR_ERR(clk_per);
 			goto failed_clock;
 		}
+		clock_freq = clk_get_rate(clk_per);
 	}

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
--
1.8.3.2