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Date:   Mon, 29 Oct 2018 19:08:19 +0000
From:   Dean Wallace <duffydack73@gmail.com>
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Stephen Boyd <sboyd@kernel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Michael Turquette <mturquette@baylibre.com>,
        linux-clk <linux-clk@vger.kernel.org>,
        Stable <stable@vger.kernel.org>,
        Johannes Stezenbach <js@sig21.net>,
        Carlo Caione <carlo@endlessm.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL)
Message-ID: <20181029190819.2ivlx73n6y6sx4vk@picard>
References: <20181025232517.ywnw54qibemosjws@picard>
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On 29-10-18, Andy Shevchenko wrote:
> On Mon, Oct 29, 2018 at 7:52 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> >
> > Cc: Pierre as well.
> >
> > On Mon, Oct 29, 2018 at 7:48 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Dean Wallace (2018-10-25 16:25:17)
> > > > I have found a regression in 4.18.15 that means I lose sound on my old
> > > > Toshiba Chromebook 2 (Swanky).  My system details are:-
> > > >
> > > > Toshiba Chromebook (Swanky)
> > > > MrChromebox UEFI coreboot
> > > > Arch Linux running latest alsa/pulseaudio
> > > >
> > > > Upgraded kernel from 4.18.14 to 4.18.15 and lost all sound output.  By
> > > > output I mean, the card is still detected, the module loaded, all apps
> > > > showing sound is being playing, but no actual audible sound comes
> > > > through.  Upgraded to 4.18.16 same issue.
> > > >
> > > > Dug around and found Upstream commit 648e921888ad96ea3dc922739e96716ad3225d7f
> > > > clk: x86: Stop marking clocks as CLK_IS_CRITICAL
> > > > "This commit removes the CLK_IS_CRITICAL marking, fixing Cherry Trail
> > > > devices not being able to reach S0i3 greatly decreasing their battery
> > > > drain when suspended."
> > > >
> > > > I reverted it and compiled 4.18.16 and have sound back again.  Could
> > > > this be looked into, with possibility of fix.
> > > >
> > >
> > > Thanks for the bug report. I'm adding some people involved in the commit
> > > you mention is causing audio regressions. The best plan is to probably
> > > revert the commit from the 4.18 linux stable tree. Or there may be
> > > another patch missing that would be useful to make this backported patch
> > > work. Hopefully Hans or Andy knows.
> >
> > Hans has been investigating S0ix issues on Baytrail and Cherrytrail machines.
> > I have a feeling that the problem can be fixed by properly handling
> > clock in ASoC driver(s). Perhaps Hans and Pierre can figure this out
> > better than me.
> 
> Looking to sound/soc/intel/boards/cht_bsw_rt5672.c I see no
> suspend-resume hooks. Perhaps, adding them like in the commit
> ac8bd9e13be2 ("r8169: Disable clk during suspend / resume") would
> help.
> 
> Btw, what the drivers are in use for the machine you have? It's better
> you run alsa-info.sh or alike to collect necessary information along
> with output of `lsmod`, `dmesg`, etc.
> 
> -- 
> With Best Regards,
> Andy Shevchenko

alsa-info.txt [1], cpuinfo [2], dmesg [3], and 'ls /sys/bus/i2c/devices' [4]
[1] https://gist.github.com/duffydack/480be8ddced44515dbf981dc09f593ec#file-alsa-info
[2] https://gist.github.com/duffydack/480be8ddced44515dbf981dc09f593ec#file-cpuinfo-log
[3] https://gist.github.com/duffydack/480be8ddced44515dbf981dc09f593ec#file-dmesg-log
[4] https://gist.github.com/duffydack/480be8ddced44515dbf981dc09f593ec#file-sys-bus-i2c-devices-log

Regards
-- 
Dean