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Date:   Sat, 8 Aug 2020 14:32:09 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Subject: Re: [GIT PULL] sound updates for 5.9

On Fri, Aug 7, 2020 at 11:46 PM Takashi Iwai <tiwai@...e.de> wrote:
>
> On Sat, 08 Aug 2020 02:23:24 +0200,
> John Stultz wrote:
> >
> > On Thu, Aug 6, 2020 at 3:33 AM Takashi Iwai <tiwai@...e.de> wrote:
> > >
> > > Linus,
> > >
> > > please pull sound updates for v5.9 from:
> > >
> > >   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git tags/sound-5.9-rc1
> > >
> > > The topmost commit is c7fabbc51352f50cc58242a6dc3b9c1a3599849b
> > >
> > > ----------------------------------------------------------------
> > >
> > > sound updates for 5.9
> > >
> > > This became wide and scattered updates all over the sound tree as
> > > diffstat shows: lots of (still ongoing) refactoring works in ASoC,
> > > fixes and cleanups caught by static analysis, inclusive term
> > > conversions as well as lots of new drivers.  Below are highlights:
> > >
> > > ASoC core:
> > > * API cleanups and conversions to the unified mute_stream() call
> > > * Simplify I/O helper functions
> > > * Use helper macros to retrieve RTD from substreams
> > ...
> > > Kuninori Morimoto (90):
> > >       ASoC: soc-component: add soc_component_pin() and share code
> > >       ASoC: soc-component: move snd_soc_component_xxx_regmap() to soc-component
> > >       ASoC: soc-component: move snd_soc_component_initialize() to soc-component.c
> > >       ASoC: soc-component: add soc_component_err()
> > >       ASoC: soc-component: add snd_soc_pcm_component_prepare()
> > >       ASoC: soc-component: add snd_soc_pcm_component_hw_params()
> > >       ASoC: soc-component: add snd_soc_pcm_component_hw_free()
> > >       ASoC: soc-component: add snd_soc_pcm_component_trigger()
> > >       ASoC: soc-component: add snd_soc_component_init()
> > >       ASoC: soc-component: merge soc-io.c into soc-component.c
> >
> > So oddly, today I bisected down the change "ASoC: soc-component: merge
> > soc-io.c into soc-component.c":
> >   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=460b42d162e3cf634586999e6a84e74ca52e626d
> >
> > as causing audio regressions on Dragonboard 845c running AOSP.
> >
> > On boot I was seeing tons of:
> > q6routing remoteproc-adsp:glink-edge:apr:apr-service@8:routing: ASoC:
> > error at soc_component_read_no_lock on
> > remoteproc-adsp:glink-edge:apr:: -5
> >
> > And when audio was supposed to play I'd see:
> > [  227.462986] qcom-q6afe aprsvc:apr-service:4:4: cmd = 0x100e5
> > returned error = 0x9
> > [  227.470720] qcom-q6afe aprsvc:apr-service:4:4: DSP returned error[9]
> > [  227.477168] qcom-q6afe aprsvc:apr-service:4:4: AFE enable for port
> > 0x4000 failed -22
> > [  227.485038] q6afe-dai
> > remoteproc-adsp:glink-edge:apr:apr-service@4:dais: fail to start AFE
> > port 2
> > [  227.494013] q6afe-dai
> > remoteproc-adsp:glink-edge:apr:apr-service@4:dais: ASoC: error at
> > snd_soc_pcm_dai_prepare on SLIMBUS_0_RX: -22
> > [  227.506034]  SLIM Playback: ASoC: DAI prepare error: -22
> > [  227.511415]  SLIM Playback: ASoC: backend prepare failed -22
> >
> > Its strange, as the bisected patch is really just moving code around
> > and there's very little in the way of logic changes. After minimizing
> > the code movement and just focusing on what changed I forward ported a
> > revert to mainline and minimized it until things were working.
> >
> > The resulting patch is a twoliner here:
> > https://git.linaro.org/people/john.stultz/android-dev.git/commit/?h=dev/db845c-mainline-WIP&id=a3527193f39b1224d59bf1519fce3ef8c57d0f5e
> >
> > I'm a bit baffled as to why this patch works. Logically we are
> > returning the same value. I suspect when we hit the error, all the
> > extra error print messages on the console slow things down and end up
> > causing some timing related initialization failure?
>
> Does the patch below fix the bug?  If so, it's rather a bug in the
> commit cf6e26c71bfd ("ASoC: soc-component: merge
> snd_soc_component_read() and snd_soc_component_read32()").
>
>
> thanks,
>
> Takashi
>
> --- a/sound/soc/soc-component.c
> +++ b/sound/soc/soc-component.c
> @@ -406,7 +406,7 @@ static unsigned int soc_component_read_no_lock(
>                 ret = -EIO;
>
>         if (ret < 0)
> -               soc_component_ret(component, ret);
> +               return soc_component_ret(component, ret);

Oh, that's so obvious now! I can't believe I was staring at that code
and just didn't see it!
Thanks so much for pointing this out!

I'm sure this will fix it, but will validate on monday when I am
working with the board.

thanks!
-john

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