linux-kernel - Re: [PATCH v2 2/2] ALSA: usb-audio: Check connector value on resume

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Date:   Thu, 25 Mar 2021 15:30:03 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Takashi Iwai <tiwai@...e.com>, Jaroslav Kysela <perex@...ex.cz>,
        Pavel Skripkin <paskripkin@...il.com>,
        Chris Chiu <chiu@...lessm.com>,
        Mark Brown <broonie@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Tom Yan <tom.ty89@...il.com>, Joe Perches <joe@...ches.com>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] ALSA: usb-audio: Check connector value on resume

On Thu, 25 Mar 2021 15:24:42 +0100,
Kai-Heng Feng wrote:
> 
> On Thu, Mar 25, 2021 at 9:55 PM Kai-Heng Feng
> <kai.heng.feng@...onical.com> wrote:
> >
> > On Thu, Mar 25, 2021 at 9:41 PM Takashi Iwai <tiwai@...e.de> wrote:
> > >
> > > On Thu, 25 Mar 2021 13:12:48 +0100,
> > > Kai-Heng Feng wrote:
> > > >
> > > > Rear Mic on Lenovo P620 cannot record after S3, despite that there's no
> > > > error and the other two functions of the USB audio, Line In and Line
> > > > Out, work just fine.
> > > >
> > > > The mic starts to work again after running userspace app like "alsactl
> > > > store". Following the lead, the evidence shows that as soon as connector
> > > > status is queried, the mic can work again.
> > > >
> > > > So also check connector value on resume to "wake up" the USB audio to
> > > > make it functional.
> > > >
> > > > This can be device specific, however I think this generic approach may
> > > > benefit more than one device.
> > > >
> > > > While at it, also remove reset-resume path to consolidate mixer resume
> > > > path.
> > > >
> > > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > > > ---
> > > > v2:
> > > >  - Remove reset-resume.
> > > >  - Fold the connector checking to the mixer resume callback.
> > >
> > > That's not what I meant exactly...  I meant to put both into the
> > > single resume callback, but handle each part conditionally depending
> > > on reset_resume argument.
> >
> > OK, I get what you mean now.
> >
> > >
> > > But this turned out to need more changes in mixer_quirks.c
> > > unnecessarily.  Maybe adding the two resume functions is a better
> > > approach in the end, but not for the specific connection thing but
> > > generically both resume and reset_resume callbacks.  Something like
> > > below.
> >
> > This approach looks good. Let me send another one.
> 
> Actually, it works really well and I don't I think I should send the
> code you wrote.
> Is it possible to push your version with my commit log, and with my tested tag?
> 
> Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Heh, I'm too lazy to write up the whole commit.  Could you just fold
into yours and submit a v3 series?  I don't mind who is credited as
the author, just put me as Suggested-by or such, if any.


thanks,

Takashi