linux-kernel - Re: Regression found (Stop-marking-clocks-as-CLK_IS

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Message-ID: <20181031235745.ntksedfker4syqbx@picard>
Date:   Wed, 31 Oct 2018 23:57:45 +0000
From:   Dean Wallace <duffydack73@...il.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        Stable <stable@...r.kernel.org>,
        Johannes Stezenbach <js@...21.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mogens Jensen <mogens-jensen@...tonmail.com>
Subject: Re: Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL)

On 31-10-18, Pierre-Louis Bossart wrote:
> 
> > Just thought it worth mentioning, this new patch that fixes sound
> > again, seems to have ressurected an old issue with PLL unlock.  I'm
> > seeing journal entries after fresh boot ......
> > 
> > ```
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard systemd[462]: Started Sound Service.
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > picard kernel: max98090_pll_work: 141 callbacks suppressed
> > picard kernel: max98090 i2c-193C9890:00: PLL unlocked
> > ```
> > 
> > sound is ok, but sometimes plugging in headphones spams journal with
> > those PLL messages, and sound turns into "daleks", and I have to
> > remove/insert headphones few times or stop/start audio to fix it.
> > It's a very old issue, maybe you'd know more about it.
> 
> I noticed this error on my Orco device used for tests many moons ago, but I
> could never find out what led to this error case, it wasn't deterministic
> and didn't impact the audio quality. All I could do is rate_limit it... If
> we have an A vs. B situation it'd be really helpful to diagnose further.
> 
> Is there really a causality between the changes from Hans and this PLL
> unlock error? Are you 100% sure this was not present in the previous install
> you used (4.18.14 as mentioned earlier in the thread)?
> 
> Thanks
> 
> -Pierre
> 
Hi Pierre.  I'm not overly bothered by it, I lived with it for a long
time when it was worse pre cht_bsw days.  It's very hit and miss, like
I have just done a few reboots and nothing is coming up in journal and
switching to headphones works fine.  Was quite a frequent issue back
before it was switched to chtmax, but after that, for me anyway, it
was all but nonexistant, apart from a very rare occassion once maybe
twice.  It's always been slightly unstable I guess, but seeing those
messages in journal, something I look at frequently, and not seeing
them for a long time, hmmm.  I'll do some more tests with older kernel
see how it compares and report back.  Then again, I could just ignore
it :)
Regards

-Dean