From: Fabio Estevam <fabio.estevam@xxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 4de349e786a3a2d51bd02d56f3de151bbc3c3df9 upstream.
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@xxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/net/can/flexcan.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index ef57e1561229..57536e935fb9 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1164,11 +1164,10 @@ static int 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);
}
@@ -1181,13 +1180,17 @@ static int 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;
}
#endif /* CONFIG_PM_SLEEP */
--
2.10.1
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