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

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Date:   Fri, 2 Nov 2018 11:27:37 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Dean Wallace <duffydack73@...il.com>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.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)

Hi,

On 01-11-18 16:50, Dean Wallace wrote:
> On 01-11-18, Hans de Goede wrote:
>> Hi,
>>
>> On 01-11-18 15:28, Dean Wallace wrote:
>>> On 01-11-18, Hans de Goede wrote:
>>>> Hi,
>>>>
>>>> On 01-11-18 11:37, Dean Wallace wrote:
>>>>> 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
>>>>>>
>>>>> Well, numerous boots, kernels, headphone inserting - no PLL or
>>>>> 'Daleks'.  My laptop must have been haunted that day (halloween).
>>>>> I'll put it to bed.
>>>>
>>>> So you can no longer reproduce. Bummer. Note this might be caused by
>>>> the temperature of the laptop when you were running the tests...
>>>>
>>>> Anyways if you hit this again and you can reproduce it, please
>>>> give adding a msleep(10) after code mucking with the clk a try.
>>>>
>>>> Regards,
>>>>
>>>> Hans
>>>>
>>> Right then, I can make it unlock and 'daleks' by going into
>>> pavucontrol and switching the Profile back and forth from Stereo
>>> Output to Stereo Output+Analog Mono Input, which is actually something
>>> I've done to make it correct itself as well.  I don't use the mic or
>>> anything so I've had it set to Stereo Ouput only which I 'think' has
>>> somehow made it more stable for me.  With all my playing around, one
>>> of the things I did was clean out my .config/pulse folder which meant
>>> by default the 'Profile' in pavucontrol was set to Output+Input, which
>>> seems to help trigger the PLL issue when inserting headphones.
>>>
>>> So what would you like me to do, as I can trigger it on demand it
>>> seems.
>>
>> Please give the attached patch a try (on top of my patch for the clk quirk)
>> and let us know if that fixes these errors.
>>
>> Regards,
>>
>> Hans
>>
> Sorry, it's not being consistent with me  Now, fresh boot again, no errors
> in journal, no errors while plugging/unplugging earphones.  I think it's
> definitely more stable with the profile in pavucontrol set to Output
> only (no + Input), but I can still trigger it by switching it, and it
> never corrects itself until I switch a few more times.

Ok, so there are 2 issues here as I see it:

1) It does not always reproduce
2) It does still reproduce sometimes with the patch, so the patch does not
fix it.

So I think we just have to live with this for now.

Regards,

Hans