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

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Date:   Sat, 7 Oct 2023 09:25:18 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Andreas Kemnade <andreas@...nade.info>
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

* 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.

Regards,

Tony

8< ------------------------
diff --git a/sound/soc/ti/omap-mcbsp.c b/sound/soc/ti/omap-mcbsp.c
index fdabed5133e83..b399d86f22777 100644
--- a/sound/soc/ti/omap-mcbsp.c
+++ b/sound/soc/ti/omap-mcbsp.c
@@ -74,14 +74,16 @@ static int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id)
 		return 0;
 	}
 
-	pm_runtime_put_sync(mcbsp->dev);
+	if (mcbsp->active)
+		pm_runtime_put_sync(mcbsp->dev);
 
 	r = clk_set_parent(mcbsp->fclk, fck_src);
 	if (r)
 		dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n",
 			src);
 
-	pm_runtime_get_sync(mcbsp->dev);
+	if (mcbsp->active)
+		pm_runtime_get_sync(mcbsp->dev);
 
 	clk_put(fck_src);