pull-request: can 2016-09-19

Hello David,

this is a pull request of one patch for the upcoming linux-4.8 release.

The patch by Fabio Estevam fixes the pm handling in the flexcan driver.

regards,
Marc



---

The following changes since commit 7ac327318e09a53e3df431dfd3f664dac7aba4df:

  Merge tag 'mac80211-for-davem-2016-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211 (2016-09-18 22:26:49 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git tags/linux-can-fixes-for-4.8-20160919

for you to fetch changes up to 4de349e786a3a2d51bd02d56f3de151bbc3c3df9:

  can: flexcan: fix resume function (2016-09-19 16:09:05 +0200)

----------------------------------------------------------------
linux-can-fixes-for-4.8-20160919

----------------------------------------------------------------
Fabio Estevam (1):
      can: flexcan: fix resume function

 drivers/net/can/flexcan.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

From: Fabio Estevam <redacted>

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 <redacted>
Cc: linux-stable <redacted>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 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 41c0fc9f3b14..16f7cadda5c3 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c

@@ -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);

-- 
2.9.3

From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Mon, 19 Sep 2016 16:19:48 +0200

this is a pull request of one patch for the upcoming linux-4.8 release.

The patch by Fabio Estevam fixes the pm handling in the flexcan driver.

Pulled, thanks.