[PATCH v2 3/4] can: flexcan: switch on clocks before accessing ecr register
From: stefan@agner.ch (Stefan Agner)
Date: 2014-07-14 07:48:59
Also in:
lkml
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
Reported-by: Ashutosh Singh <redacted> Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de> [stefan at agner.ch: added return check for clk_enable_prepare] Signed-off-by: Stefan Agner <stefan@agner.ch> --- drivers/net/can/flexcan.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index f425ec2..4c598c9 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c@@ -383,11 +383,25 @@ static int flexcan_get_berr_counter(const struct net_device *dev, { const struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->base; - u32 reg = flexcan_read(®s->ecr); + u32 reg, err; + + err = clk_prepare_enable(priv->clk_ipg); + if (err) + return err; + + err = clk_prepare_enable(priv->clk_per); + if (err) + goto out_disable_ipg; + + reg = flexcan_read(®s->ecr); bec->txerr = (reg >> 0) & 0xff; bec->rxerr = (reg >> 8) & 0xff; + clk_disable_unprepare(priv->clk_per); + out_disable_ipg: + clk_disable_unprepare(priv->clk_ipg); + return 0; }
--
2.0.1