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

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.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index ae08cf129ebbb0bda31f4b74893574b9703253f0..aaed97bee4711d1cb2e8b1eb514fc3e343ad21e0 100644 (file)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1020,13 +1020,13 @@ static int flexcan_probe(struct platform_device *pdev)
                        dev_err(&pdev->dev, "no ipg clock defined\n");
                        return PTR_ERR(clk_ipg);
                }
-               clock_freq = clk_get_rate(clk_ipg);
 
                clk_per = devm_clk_get(&pdev->dev, "per");
                if (IS_ERR(clk_per)) {
                        dev_err(&pdev->dev, "no per clock defined\n");
                        return PTR_ERR(clk_per);
                }
+               clock_freq = clk_get_rate(clk_per);
        }
 
        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);