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-rw-r--r--drivers/net/can/flexcan.c26
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index dff4fa472c3a..61376abdab39 100644
--- 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);