Re: Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL)

Andy Shevchenko
2018-10-30T02:54:32Z

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