netdev - Fwd: Intel 7560 LTE Modem stops working after resuming from standby

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Date: Thu, 12 Oct 2023 16:52:50 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: 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>
Cc: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>,
 Loic Poulain <loic.poulain@...aro.org>,
 Sergey Ryazanov <ryazanov.s.a@...il.com>,
 Johannes Berg <johannes@...solutions.net>
Subject: Fwd: Intel 7560 LTE Modem stops working after resuming from standby

Hi,

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

See Bugzilla for the full thread.

Anyway, I'm adding this regression to regzbot:

#regzbot introduced: e4f5073d53be6c https://bugzilla.kernel.org/show_bug.cgi?id=217996
#regzbot title: pm support for Intel 7560 makes the modem stops working after resume

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217996

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