linux-kernel - Re: [alsa-devel] [EXT] Re: [PATCH] ASoC: sgtl5000: Revert "ASoC: sgtl5000: Fix of unmute outputs on probe"

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:   Fri, 20 Mar 2020 15:51:05 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "alison.wang@....com" <alison.wang@....com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        Igor Opanyuk <igor.opanyuk@...adex.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [alsa-devel] [EXT] Re: [PATCH] ASoC: sgtl5000: Revert "ASoC:
 sgtl5000: Fix of unmute outputs on probe"

On Fri, Mar 20, 2020 at 10:06 AM Oleksandr Suvorov
<oleksandr.suvorov@...adex.com> wrote:
>
> On Fri, Mar 20, 2020 at 5:51 PM Tim Harvey <tharvey@...eworks.com> wrote:
> >
> > On Fri, Mar 20, 2020 at 12:26 AM Marcel Ziswiler
> > <marcel.ziswiler@...adex.com> wrote:
> > >
> > > Hi Tim
> > >
> > > On Thu, 2020-03-19 at 13:49 -0700, Tim Harvey wrote:
> > > > On Thu, Dec 12, 2019 at 4:24 AM Mark Brown <broonie@...nel.org>
> > > > wrote:
> > > > > On Thu, Dec 12, 2019 at 10:46:31AM +0000, Alison Wang wrote:
> > > > >
> > > > > > We tested this standard solution using gstreamer and standard
> > > > > > ALSA
> > > > > > tools like aplay, arecord and all these tools unmute needed
> > > > > > blocks
> > > > > > successfully.
> > > > > > [Alison Wang] I am using aplay. Do you mean I need to add some
> > > > > > parameters for aplay or others to unmute the outputs?
> > > > >
> > > > > Use amixer.
> > > >
> > > > Marc / Oleksandr,
> > > >
> > > > I can't seem to find the original patch in my mailbox for 631bc8f:
> > > > ('ASoC: sgtl5000: Fix of unmute outputs on probe')
> > >
> > > I forwarded you that one again. OK?
> > >
> > > > however I find it
> > > > breaks sgtl5000 audio output on the Gateworks boards which is still
> > > > broken on 5.6-rc6.
> > >
> > > What exactly do you mean by "breaks"? Isn't it that you just need to
> > > unmute stuff e.g. using amixer or using a proper updated asound.state
> > > file with default states for your controls?
> >
> > the audio device is in /proc/asound/cards but when I send audio to it
> > I 'hear' nothing out the normal line-out output.
> >
> > >
> > > > Was there some follow-up patches that haven't made
> > > > it into mainline yet regarding this?
> > >
> > > I don't think so. It all works perfectly, not?
> > >
> > > > The response above indicates maybe there was an additional ALSA
> > > > control perhaps added as a resolution but I don't see any differences
> > > > there.
> > >
> > > Not that I am aware of, no.
> > >
> >
> > The output of 'amixer' shows nothing different than before this patch
> > where audio out worked (same controls, same settings on them). I'm
> > testing this with a buildroot rootfs with no asound.conf (or at least
> > none that I know of... i'm honestly not clear where all they can be).
>
> Tim, did you try to unmute the output with amixer?
>
> Could you provide the output of your amixer with and without this patch?
>
> Before this patch, the driver unmuted HP, LO, and ADC unconditionally
> on load (while it just had to set up ZCD bits).
> Now HP, LO, ADC remain muted until one unmutes them using standard
> ALSA tools/interfaces.
> ALSA mute/unmute controls for these outputs have been presenting in
> the kernel for a long time. Please, just use them.
>

Oleksandr,

When I first bisected to this I must have done something wrong as I
thought amixer settings showed the same before and after - I see that
I'm wrong about that. I see the differences now with HP, LO, and ADC
muted by default. I agree using amixer controls is fine.

Sorry for the noise!

Tim