can: flexcan: factor out soft reset into seperate funtion

This patch moves the soft reset into a seperate function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index dff4fa4..61376ab 100644 (file)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -363,6 +363,21 @@ static int flexcan_chip_unfreeze(struct flexcan_priv *priv)
        return 0;
 }
 
+static int flexcan_chip_softreset(struct flexcan_priv *priv)
+{
+       struct flexcan_regs __iomem *regs = priv->base;
+       unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
+
+       flexcan_write(FLEXCAN_MCR_SOFTRST, &regs->mcr);
+       while (timeout-- && (flexcan_read(&regs->mcr) & FLEXCAN_MCR_SOFTRST))
+               usleep_range(10, 20);
+
+       if (flexcan_read(&regs->mcr) & FLEXCAN_MCR_SOFTRST)
+               return -ETIMEDOUT;
+
+       return 0;
+}
+
 static int flexcan_get_berr_counter(const struct net_device *dev,
                                    struct can_berr_counter *bec)
 {
@@ -786,16 +801,9 @@ static int flexcan_chip_start(struct net_device *dev)
                return err;
 
        /* soft reset */
-       flexcan_write(FLEXCAN_MCR_SOFTRST, &regs->mcr);
-       udelay(10);
-
-       reg_mcr = flexcan_read(&regs->mcr);
-       if (reg_mcr & FLEXCAN_MCR_SOFTRST) {
-               netdev_err(dev, "Failed to softreset can module (mcr=0x%08x)\n",
-                          reg_mcr);
-               err = -ENODEV;
+       err = flexcan_chip_softreset(priv);
+       if (err)
                goto out_chip_disable;
-       }
 
        flexcan_set_bittiming(dev);