linux-kernel - Re: [PATCH 2/2] ASoC: SOF: Intel: hda: Avoid checking jack on system suspend

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Date:   Mon, 4 Jan 2021 16:15:28 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...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 2/2] ASoC: SOF: Intel: hda: Avoid checking jack on system suspend

On Fri, Jan 1, 2021 at 4:07 PM Takashi Iwai <tiwai@...e.de> wrote:
>
> On Thu, 31 Dec 2020 19:06:43 +0100,
> Kai-Heng Feng wrote:
> >
> > On Thu, Dec 31, 2020 at 6:55 PM Takashi Iwai <tiwai@...e.de> wrote:
> > >
> > > On Tue, 29 Dec 2020 14:38:15 +0100,
> > > 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)
> > > > [   90.067337] Filesystems sync: 0.001 seconds
> > > > [   90.185758] Freezing user space processes ... (elapsed 0.002 seconds) done.
> > > > [   90.188713] OOM killer disabled.
> > > > [   90.188714] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
> > > > [   90.190024] printk: Suspending console(s) (use no_console_suspend to debug)
> > > > [   90.904912] intel_pch_thermal 0000:00:12.0: CPU-PCH is cool [49C], continue to suspend
> > > > [  321.262505] snd_hda_codec_realtek ehdaudio0D0: Unable to sync register 0x2b8000. -5
> > > > [  328.426919] snd_hda_codec_realtek ehdaudio0D0: Unable to sync register 0x2b8000. -5
> > > > [  329.490933] ACPI: EC: interrupt blocked
> > > >
> > > > That commit keeps codec suspended during the system suspend. However,
> > > > SOF driver's runtime resume, which is for system suspend, calls
> > > > hda_codec_jack_check() and schedules jackpoll_work. The jackpoll
> > > > work uses snd_hda_power_up_pm() which tries to resume the codec in
> > > > system suspend path, hence blocking the suspend process.
> > > >
> > > > So only check jack status if it's not in system PM process.
> > >
> > > After your previous patch set, the legacy HDA does queue the
> > > jackpoll_work only if jackpoll_interval is set.  I suppose rather the
> > > same rule would be applied?
> >
> > It's queued in hda_codec_pm_complete(), which happens at the end of PM process.
> > This one is queued in the middle of PM suspend, so it's not the same here.
>
> But why do we need the jack status check explicitly there if
> hda_codec_pm_complete() already does it (via re-queuing the resume)?

Because hda_resume() is called for both system and runtime resume, but
hda_codec_pm_complete() only gets called for system resume. So we
still need to cover the runtime resume case.

However, we can use pm_request_resume() to wakeup the codec and do the
jack detection, instead of queueing jackpoll_work directly. I'll do
the change in v2.

Kai-Heng

>
> thanks,
>
> Takashi
>
> >
> > Kai-Heng
> >
> > >
> > >
> > > thanks,
> > >
> > > Takashi
> > >
> > > >
> > > > Fixes: 215a22ed31a1 ("ALSA: hda: Refactor codec PM to use direct-complete optimization")
> > > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > > > ---
> > > >  sound/soc/sof/intel/hda-dsp.c | 3 ++-
> > > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
> > > > index 7d00107cf3b2..1c5e05b88a90 100644
> > > > --- a/sound/soc/sof/intel/hda-dsp.c
> > > > +++ b/sound/soc/sof/intel/hda-dsp.c
> > > > @@ -685,7 +685,8 @@ static int hda_resume(struct snd_sof_dev *sdev, bool runtime_resume)
> > > >       /* check jack status */
> > > >       if (runtime_resume) {
> > > >               hda_codec_jack_wake_enable(sdev, false);
> > > > -             hda_codec_jack_check(sdev);
> > > > +             if (sdev->system_suspend_target == SOF_SUSPEND_NONE)
> > > > +                     hda_codec_jack_check(sdev);
> > > >       }
> > > >
> > > >       /* turn off the links that were off before suspend */
> > > > --
> > > > 2.29.2
> > > >
> >