From: Sean Nyekjaer <sean@geanix.com>
To: Joakim Zhang <qiangqing.zhang@nxp.com>,
"mkl@pengutronix.de" <mkl@pengutronix.de>,
"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 0/4] can: flexcan: fixes for stop mode
Date: Wed, 27 Nov 2019 09:12:38 +0100 [thread overview]
Message-ID: <4a9c2e4a-c62d-6e88-bd9e-01778dab503b@geanix.com> (raw)
In-Reply-To: <e936b9b1-d602-ac38-213c-7272df529bef@geanix.com>
On 27/11/2019 07.12, Sean Nyekjaer wrote:
>
>
> On 27/11/2019 06.56, Joakim Zhang wrote:
>> Could you help check the patch set? With your suggestions, I
>> have cooked a patch to exit stop mode during probe stage.
>>
>> IMHO, I think this patch is unneed, now in flexcan driver,
>> enter stop mode when suspend, and then exit stop mode when resume.
>> AFAIK, as long as flexcan_suspend has been called, flexcan_resume will
>> be called, unless the system hang during suspend/resume. If so, only
>> code reset can activate OS again. Could you please tell me how does CAN
>> stucked in stop mode at your side?
>
> Hi Joakim,
>
> Thanks I'll test this :-)
> Guess I will have do some hacking to get it stuck in stop mode.
>
> We have a lot of devices in the field that doesn't have:
> "can: flexcan: fix deadlock when using self wakeup"
>
> And they have traffic on both CAN interfaces, that way it's quite easy
> to get them stuck in stop mode.
>
> /Sean
Hi Joakim,
I have been testing this.
I have a hacked version of the driver that calls
flexcan_enter_stop_mode() as the last step in the probe function.
First insert of flexcan.ko when stop mode is activated:
flexcan 2090000.flexcan: Linked as a consumer to regulator.4
flexcan 2090000.flexcan: registering netdev failed
flexcan 2090000.flexcan: Dropping the link to regulator.4
flexcan: probe of 2090000.flexcan failed with error -110
flexcan 2094000.flexcan: Linked as a consumer to regulator.4
flexcan 2094000.flexcan: registering netdev failed
flexcan 2094000.flexcan: Dropping the link to regulator.4
flexcan: probe of 2094000.flexcan failed with error -110
When I insert a flexcan.ko with the patch
"can: flexcan: try to exit stop mode during probe stage":
flexcan 2090000.flexcan: Linked as a consumer to regulator.4
flexcan 2090000.flexcan: Unbalanced pm_runtime_enable!
flexcan 2094000.flexcan: Linked as a consumer to regulator.4
flexcan 2094000.flexcan: Unbalanced pm_runtime_enable!
I works as I expected but, I think we need to do some pm_runtime cleanup
when bailing with error -110.
Anyways it works great, thanks for your work on this.
/Sean
next prev parent reply other threads:[~2019-11-27 8:13 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
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 [this message]
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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