On Sat, 08 Aug 2020 02:23:24 +0200,
John Stultz wrote:
>
> On Thu, Aug 6, 2020 at 3:33 AM Takashi Iwai <ti...@suse.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);
return val;
}
