For i.MX7D LPSR mode, the controller will lost power and got the
configuration state lost after system resume back. (coming i.MX8QM/QXP
will also completely power off the domain, the controller state will be
lost and needs restore).
So we need to set pinctrl state again and re-start chip to do
re-configuration after resume.
For wakeup case, it should not set pinctrl to sleep state by
pinctrl_pm_select_sleep_state.
For interface is not up before suspend case, we don't need
re-configure as it will be configured by user later by interface up.
Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx>
ChangeLog:
V1->V2:
* rebase on linux-can/testing.
* move into a patch set.
---
drivers/net/can/flexcan.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index de2bf71b335b..b3edaf6a5a61 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -25,6 +25,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/regmap.h>
#define DRV_NAME "flexcan"
@@ -1640,9 +1641,9 @@ static int __maybe_unused flexcan_suspend(struct device *device)
priv->in_stop_mode = true;
} else {
- err = flexcan_chip_disable(priv);
- if (err)
- return err;
+ flexcan_chip_stop(dev);
+
+ pinctrl_pm_select_sleep_state(device);
}
netif_stop_queue(dev);
netif_device_detach(dev);
@@ -1674,7 +1675,9 @@ static int __maybe_unused flexcan_resume(struct device *device)
disable_irq_wake(dev->irq);
} else {
- err = flexcan_chip_enable(priv);
+ pinctrl_pm_select_default_state(device);
+
+ err = flexcan_chip_start(dev);
if (err)
return err;
}
--
2.17.1
