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

[Tony Lindgren <tony@atomide.com>]

* Andreas Kemnade <andreas@kemnade.info> [231006 19:30]:
> On Fri, 6 Oct 2023 13:23:48 +0300
> Tony Lindgren <tony@atomide.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);