linux-kernel - Re: [PATCH 1/3] ASoC: ti: omap-mcbsp: Ignore errors for getting fck

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Message-ID: <20231015234815.637f5c14@aktux>
Date:   Sun, 15 Oct 2023 23:48:15 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Péter Ujfalusi <peter.ujfalusi@...il.com>,
        bcousson@...libre.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, jarkko.nikula@...mer.com,
        dmitry.torokhov@...il.com, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 1/3] ASoC: ti: omap-mcbsp: Ignore errors for getting
 fck_src

Hi Tony,

On Sat, 7 Oct 2023 09:25:18 +0300
Tony Lindgren <tony@...mide.com> wrote:

> * Andreas Kemnade <andreas@...nade.info> [231006 19:30]:
> > On Fri, 6 Oct 2023 13:23:48 +0300
> > Tony Lindgren <tony@...mide.com> wrote:  
> > > Here's what I think the regression fix for omap4 clocks would be, the
> > > old main_clk is not the same as the module clock that we get by default.
> > > If this looks OK I'll do a similar fix also for omap5.
> > > 
> > > Or is something else also needed?
> > >   
> > 
> > hmm,
> > audio output works, the waring is away, but something new is here:  
> 
> OK good to hear it works, I'll send out fixes for omap4 and 5, seems
> the runtime PM warning is something different.
> 
> > omap-mcbsp 40124000.mcbsp: Runtime PM usage count underflow!
> > # cat /sys/bus/platform/devices/40124000.mcbsp/power/runtime_status 
> > active
> > 
> > even with no sound.  
> 
> I guess if the mcbsp instance is not used, runtime PM is enabled but
> pm_runtime_resume_and_get() is never called by ASoC?
> 
> If so then the following might be a fix, not familiar with runtime PM
> done by ASoC though and not sure if some kind of locking would be
> needed here.
> 
just checked: that one fixes the regression. runtime suspends again.

Regards,
Andreas