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can: flexcan: fix resume function

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On a imx6ul-pico board the following error is seen during system suspend:

dpm_run_callback(): platform_pm_resume+0x0/0x54 returns -110
PM: Device 2090000.flexcan failed to resume: error -110

The reason for this suspend error is because when the CAN interface is not
active the clocks are disabled and then flexcan_chip_enable() will
always fail due to a timeout error.

In order to fix this issue, only call flexcan_chip_enable/disable()
when the CAN interface is active.

Based on a patch from Dong Aisheng in the NXP kernel.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Fabio Estevam 2016-08-17 12:41:08 -03:00 committed by Marc Kleine-Budde
parent 7ac327318e
commit 4de349e786
1 changed files with 8 additions and 5 deletions
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13
drivers/net/can/flexcan.c
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@ -1268,11 +1268,10 @@ static int __maybe_unused flexcan_suspend(struct device *device)
struct flexcan_priv *priv = netdev_priv(dev);
int err;
err = flexcan_chip_disable(priv);
if (err)
return err;
if (netif_running(dev)) {
err = flexcan_chip_disable(priv);
if (err)
return err;
netif_stop_queue(dev);
netif_device_detach(dev);
}
@ -1285,13 +1284,17 @@ static int __maybe_unused flexcan_resume(struct device *device)
{
struct net_device *dev = dev_get_drvdata(device);
struct flexcan_priv *priv = netdev_priv(dev);
int err;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
if (netif_running(dev)) {
netif_device_attach(dev);
netif_start_queue(dev);
err = flexcan_chip_enable(priv);
if (err)
return err;
}
return flexcan_chip_enable(priv);
return 0;
}
static SIMPLE_DEV_PM_OPS(flexcan_pm_ops, flexcan_suspend, flexcan_resume);