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@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 8f5ce747feb57a093dc78e4a24bd9742b5ea99fc..c1c3b132fed5e12cd5b09506689df2d138ce71cc 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);