From: Joakim Zhang <qiangqing.zhang@nxp.com>
To: Marc Kleine-Budde <mkl@pengutronix.de>,
"sean@geanix.com" <sean@geanix.com>,
"linux-can@vger.kernel.org" <linux-can@vger.kernel.org>
Cc: dl-linux-imx <linux-imx@nxp.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: RE: [PATCH V2 4/4] can: flexcan: add LPSR mode support
Date: Wed, 4 Dec 2019 09:58:56 +0000 [thread overview]
Message-ID: <DB7PR04MB4618D604D85599B1B7E76810E65D0@DB7PR04MB4618.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <28bce2f5-8d49-d803-60c7-a8dec87a4fa6@pengutronix.de>
> -----Original Message-----
> From: Marc Kleine-Budde <mkl@pengutronix.de>
> Sent: 2019年12月4日 17:00
> To: Joakim Zhang <qiangqing.zhang@nxp.com>; sean@geanix.com;
> linux-can@vger.kernel.org
> Cc: dl-linux-imx <linux-imx@nxp.com>; netdev@vger.kernel.org
> Subject: Re: [PATCH V2 4/4] can: flexcan: add LPSR mode support
>
> On 11/27/19 6:56 AM, Joakim Zhang wrote:
> > 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@nxp.com>
> > ------
> > ChangeLog:
> > V1->V2: no change.
> > ---
> > drivers/net/can/flexcan.c | 21 ++++++++++++++-------
> > 1 file changed, 14 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
> > index d178146b3da5..d1509cffdd24 100644
> > --- a/drivers/net/can/flexcan.c
> > +++ b/drivers/net/can/flexcan.c
> > @@ -26,6 +26,7 @@
> > #include <linux/platform_device.h>
> > #include <linux/pm_runtime.h>
> > #include <linux/regulator/consumer.h>
> > +#include <linux/pinctrl/consumer.h>
> > #include <linux/regmap.h>
> >
> > #define DRV_NAME "flexcan"
> > @@ -1707,7 +1708,7 @@ static int __maybe_unused
> flexcan_suspend(struct
> > device *device) {
> > struct net_device *dev = dev_get_drvdata(device);
> > struct flexcan_priv *priv = netdev_priv(dev);
> > - int err = 0;
> > + int err;
> >
> > if (netif_running(dev)) {
> > /* if wakeup is enabled, enter stop mode @@ -1719,25 +1720,27
> @@
> > static int __maybe_unused flexcan_suspend(struct device *device)
> > if (err)
> > return err;
> > } else {
> > - err = flexcan_chip_disable(priv);
> > + flexcan_chip_stop(dev);
> > +
> > + err = pm_runtime_force_suspend(device);
> > if (err)
> > return err;
> >
> > - err = pm_runtime_force_suspend(device);
> > + pinctrl_pm_select_sleep_state(device);
>
> Please add error handling for pinctrl_pm_select_sleep_state().
Got it.
> > }
> > netif_stop_queue(dev);
> > netif_device_detach(dev);
> > }
> > priv->can.state = CAN_STATE_SLEEPING;
> >
> > - return err;
> > + return 0;
> > }
> >
> > 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 = 0;
> > + int err;
> >
> > priv->can.state = CAN_STATE_ERROR_ACTIVE;
> > if (netif_running(dev)) {
> > @@ -1749,15 +1752,19 @@ static int __maybe_unused
> flexcan_resume(struct device *device)
> > if (err)
> > return err;
> > } else {
> > + pinctrl_pm_select_default_state(device);
>
> same here
Got it.
> > +
> > err = pm_runtime_force_resume(device);
> > if (err)
> > return err;
> >
> > - err = flexcan_chip_enable(priv);
> > + err = flexcan_chip_start(dev);
> > + if (err)
> > + return err;
> > }
> > }
> >
> > - return err;
> > + return 0;
> > }
> >
> > static int __maybe_unused flexcan_runtime_suspend(struct device
> > *device)
> >
Best Regards,
Joakim Zhang
> Marc
>
> --
> Pengutronix e.K. | Marc Kleine-Budde |
> Embedded Linux | https://www.pengutronix.de |
> Vertretung West/Dortmund | Phone: +49-231-2826-924 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
next prev parent reply other threads:[~2019-12-04 9:59 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-27 5:56 [PATCH V2 0/4] can: flexcan: fixes for stop mode Joakim Zhang
2019-11-27 5:56 ` [PATCH V2 1/4] can: flexcan: fix deadlock when using self wakeup Joakim Zhang
2019-11-27 9:58 ` Sean Nyekjaer
2019-12-03 17:25 ` Marc Kleine-Budde
2019-12-03 17:42 ` Marc Kleine-Budde
2019-12-04 1:58 ` Joakim Zhang
2019-12-04 8:31 ` Marc Kleine-Budde
2019-12-04 8:35 ` Joakim Zhang
2019-11-27 5:56 ` [PATCH V2 2/4] can: flexcan: try to exit stop mode during probe stage Joakim Zhang
2019-11-27 9:58 ` Sean Nyekjaer
2019-12-03 18:14 ` Marc Kleine-Budde
2019-12-04 2:22 ` Joakim Zhang
2019-12-04 8:45 ` Marc Kleine-Budde
2019-12-04 9:58 ` Joakim Zhang
2019-12-05 8:46 ` Joakim Zhang
2019-12-05 9:21 ` Sean Nyekjaer
2019-12-05 11:04 ` Joakim Zhang
2019-12-05 11:11 ` Sean Nyekjaer
2019-12-05 11:19 ` Joakim Zhang
2019-12-05 11:32 ` Sean Nyekjaer
2019-12-07 20:32 ` Marc Kleine-Budde
2019-12-08 10:47 ` Sean Nyekjaer
2019-12-08 10:56 ` Marc Kleine-Budde
2019-11-27 5:56 ` [PATCH V2 3/4] can: flexcan: change the way of stop mode acknowledgment Joakim Zhang
2019-11-27 9:58 ` Sean Nyekjaer
2019-12-03 18:21 ` Marc Kleine-Budde
2019-12-04 2:23 ` Joakim Zhang
2019-11-27 5:56 ` [PATCH V2 4/4] can: flexcan: add LPSR mode support Joakim Zhang
2019-12-04 2:25 ` Joakim Zhang
2019-12-04 8:59 ` Marc Kleine-Budde
2019-12-04 9:58 ` Joakim Zhang [this message]
2019-12-04 9:20 ` Marc Kleine-Budde
2019-12-04 9:59 ` Joakim Zhang
2019-12-04 10:58 ` Joakim Zhang
2019-11-27 6:12 ` [PATCH V2 0/4] can: flexcan: fixes for stop mode Sean Nyekjaer
2019-11-27 8:12 ` Sean Nyekjaer
2019-11-27 9:36 ` Joakim Zhang
2019-11-27 9:48 ` Joakim Zhang
2019-11-27 9:52 ` Sean Nyekjaer
2019-11-27 9:58 ` Joakim Zhang
2019-11-27 9:59 ` Sean Nyekjaer
2019-11-27 10:04 ` Joakim Zhang
2019-12-03 10:16 ` Joakim Zhang
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