[PATCH] can: flexcan: avoid unbalanced pm_runtime_enable warning

* [PATCH] can: flexcan: avoid unbalanced pm_runtime_enable warning
@ 2022-12-13  9:43 haibo.chen
  2022-12-13 13:38 ` Marc Kleine-Budde
  0 siblings, 1 reply; 2+ messages in thread
From: haibo.chen @ 2022-12-13  9:43 UTC (permalink / raw)
  To: wg, mkl
  Cc: davem, edumazet, kuba, pabeni, linux-can, netdev, linux-imx, haibo.chen

From: Haibo Chen <haibo.chen@nxp.com>

When do suspend/resume, meet the following warning message:
[   30.028336] flexcan 425b0000.can: Unbalanced pm_runtime_enable!

Balance the pm_runtime_force_suspend() and pm_runtime_force_resume().

Fixes: 8cb53b485f18 ("can: flexcan: add auto stop mode for IMX93 to support wakeup")
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/net/can/flexcan/flexcan-core.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 0aeff34e5ae1..6d638c93977b 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -2349,9 +2349,15 @@ static int __maybe_unused flexcan_noirq_resume(struct device *device)
 	if (netif_running(dev)) {
 		int err;
 
-		err = pm_runtime_force_resume(device);
-		if (err)
-			return err;
+		/* For the wakeup in auto stop mode, no need to gate on the
+		 * clock here, hardware will do this automatically.
+		 */
+		if (!(device_may_wakeup(device) &&
+		      priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE)) {
+			err = pm_runtime_force_resume(device);
+			if (err)
+				return err;
+		}
 
 		if (device_may_wakeup(device))
 			flexcan_enable_wakeup_irq(priv, false);
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 2+ messages in thread