linux-kernel - Re: Intel 7560 LTE Modem stops working after resuming from standby

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Date:   Mon, 16 Oct 2023 15:18:56 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     M Chetan Kumar <m.chetan.kumar@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux Networking <netdev@...r.kernel.org>,
        Linux Intel Wireless WAN <linuxwwan@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>
Subject: Re: Intel 7560 LTE Modem stops working after resuming from standby

Hi Bagas,

On Fri, 13 Oct 2023 at 02:04, Bagas Sanjaya <bagasdotme@...il.com> wrote:
>
> On Thu, Oct 12, 2023 at 06:54:11PM +0200, Loic Poulain wrote:
> > Hi Chetan,
> >
> > On Thu, 12 Oct 2023 at 11:52, Bagas Sanjaya <bagasdotme@...il.com> wrote:
> > > I notice a regression report on Bugzilla [1]. Quoting from it:
> > >
> > > > I noticed a few days ago, after Fedora moved to Kernel 6.5, that my Intel LTE Modem was not working anymore after resuming from standby.
> > > >
> > > > The journal listed this error message multiple times:
> > > > kernel: iosm 0000:01:00.0: msg timeout
> > > >
> > > > It took me a while to determine the root cause of the problem, since the modem did not work either in the following warm reboots.
> > > > Only a shutdown revived the modem.
> > > >
> > > > I did a bisection of the error and I was able to find the culprit:
> > > >
> > > > [e4f5073d53be6cec0c654fac98372047efb66947] net: wwan: iosm: enable runtime pm support for 7560
> >
> > Any quick fix for this issue? alternatively we will probably revert e4f5073d53.
>
> Chetan can't be contacted as sending to his address bounces (error 550)
> (had he left Intel?). Last message on LKML is this culprit patch [1].
> Hence, revert for now.

Could you please submit the revert fix?

Regards,
Loic