linux-kernel - Re: [PATCH v2 3/3] ASoC: SOF: Intel: hda: Avoid checking jack on system suspend

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 7 Jan 2021 18:32:09 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Kai Vehmanen <kai.vehmanen@...ux.intel.com>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        daniel.baluta@....com, Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Keyon Jie <yang.jie@...ux.intel.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Marcin Rajwa <marcin.rajwa@...ux.intel.com>,
        Payal Kshirsagar <payalskshirsagar1234@...il.com>,
        "moderated list:SOUND - SOUND OPEN FIRMWARE (SOF) DRIVERS" 
        <sound-open-firmware@...a-project.org>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] ASoC: SOF: Intel: hda: Avoid checking jack on
 system suspend

On Tue, Jan 5, 2021 at 8:28 PM Kai Vehmanen
<kai.vehmanen@...ux.intel.com> wrote:
>
> Hey,
>
> On Mon, 4 Jan 2021, Kai-Heng Feng wrote:
>
> > System takes a very long time to suspend after commit 215a22ed31a1
> > ("ALSA: hda: Refactor codec PM to use direct-complete optimization"):
> > [   90.065964] PM: suspend entry (s2idle)
>
> the patch itself looks good, but can you explain a bit more in what
> conditions you hit the delay?

If both controller and codec are suspended, I can 100% reproduce the issue.

>
> I tried to reproduce the delay on multiple systems (with tip of
> tiwai/master), but with no luck. I can see hda_jackpoll_work() called, but
> at this point runtime pm has been disabled already (via
> __device_suspend()) and snd_hdac_is_power_on() will return true even when
> pm_runtime_suspended() is true as well (which is expected as runtime-pm is
> disabled at this point for system suspend). End result is codec is not
> powered up in hda_jackpoll_work() and suspend is not delayed.

On my system snd_hdac_is_power_on() calls hda_set_power_state() which
takes long time to write to (suspended) codec.
I am not sure why it doesn't power up codec on your system.

>
> The patch still seems correct. You would hit the problem you describe if
> jackpoll_interval was set to a non-zero value (not the case on most
> systems supported by SOF, but still a possibility). I'm still curious how
> you hit the problem. At minimum, we are missing a scenario in our testing.

The issue happens with zero jackpoll_interval.

Kai-Heng

>
> Br, Kai