From: Dean Wallace <duffydack73@gmail.com>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Stephen Boyd <sboyd@kernel.org>,
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>,
Mogens Jensen <mogens-jensen@protonmail.com>
Subject: Re: Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL)
Date: Tue, 30 Oct 2018 14:38:36 +0000 [thread overview]
Message-ID: <20181030143836.feo7zcxiestylxoo@picard> (raw)
In-Reply-To: <c8fb730a-c160-41b4-dad0-8ed8594e5687@redhat.com>
On 30-10-18, Hans de Goede wrote:
> Hi Dean,
>
> Attached are 2 different attempts at fixing this.
>
> When trying these patches do not forget to remove the revert of the
> "Stop-marking-clocks-as-CLK_IS_CRITICAL" commit.
>
> Please first try the 0001-ASoC-intel-cht_bsw_max98090_ti-Use-pmc_plt_clk_0-ins.patch
> patch I expect that one to do the trick indicating that the Swanky model
> uses a different pmc clk then which is normally used for the codec clock.
>
> If that patch does not fix things, please give the other patch a try.
>
> Regards,
>
> Hans
>
>
>
> On 29-10-18 23:03, Pierre-Louis Bossart wrote:
> >
> > On 10/29/18 2:08 PM, Dean Wallace wrote:
> > > 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.
> >
> > I missed this change while i was away. It's indeed the expectation that the audio mclk is handled by the firmware,
>
> I believe that the statement "It's indeed the expectation that the
> audio mclk is handled by the firmware" is not correct for BYT/CHT
> platforms (and the commit causing the regression only affects BYT/CHT
> platforms). Various machine drivers under sound/soc/intel/boards have
> code to deal with the mclk themselves, like this:
>
> drv->mclk = devm_clk_get(&pdev->dev, "pmc_plt_clk_3");
> ...
>
> if (SND_SOC_DAPM_EVENT_ON(event)) {
> ret = clk_prepare_enable(ctx->mclk);
> ...
> } else {
> clk_disable_unprepare(ctx->mclk);
> }
>
> The above code is from sound/soc/intel/boards/cht_bsw_max98090_ti.c
> which is the machine driver used on the machines for which problems
> are now being reported.
>
> And my commit introducing the problem is in essence a revert of:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=d31fd43c0f9a41e2678a1e78c0f22f0384c6edd3
>
> Which is from 2017-07-14 and the ASoC code for BYT/CHT platforms is
> much older then that.
>
> Also I asked Carlo why he wrote that patch and it was to fix a problem
> with ethernet on some laptops.
>
> > not sure I understand why removing the CLK_IS_CRITICAL was necessary or what it has to do with S0ix.
>
> It is necessary, because if it is set the clock never gets disabled and
> on x86 platforms using suspend2idle we are responsible for *all* the hardware
> power-management as OS. If we do not disable the clocks then we can only
> reach S0i1 instead of S0i3 when suspended leading to increased battery
> drain during suspend.
>
> Also note that this patch is only causing problems on CHT + max98090 codec
> using machines. I've tested it on many other BYT/CHT machines myself and
> we've not had any other bug reports related to this.
>
> So this clearly points to a problem with the clock management in the
> cht_bsw_max98090_ti.c machine driver.
>
> I've some ideas how to fix this and I will prepare some patches to test.
>
> Regards,
>
> Hans
Excellent work Hans. Compiled 4.19 with
0001-ASoC-intel-cht_bsw_max98090_ti-Use-pmc_plt_clk_0-ins.patch, sound
works as before.
for i in /sys/kernel/debug/clk/pmc_plt_clk_?; do echo -n "$i: "; cat $i/clk_flags; echo; done
/sys/kernel/debug/clk/pmc_plt_clk_0:
/sys/kernel/debug/clk/pmc_plt_clk_1:
/sys/kernel/debug/clk/pmc_plt_clk_2:
/sys/kernel/debug/clk/pmc_plt_clk_3:
/sys/kernel/debug/clk/pmc_plt_clk_4:
/sys/kernel/debug/clk/pmc_plt_clk_5:
Regards
--
Dean
next prev parent reply other threads:[~2018-10-30 14:38 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20181025232517.ywnw54qibemosjws@picard>
2018-10-29 17:45 ` Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL) Stephen Boyd
2018-10-29 17:52 ` Andy Shevchenko
2018-10-29 18:04 ` Andy Shevchenko
2018-10-29 19:08 ` Dean Wallace
2018-10-29 22:03 ` Pierre-Louis Bossart
2018-10-30 10:17 ` Hans de Goede
2018-10-30 11:05 ` Hans de Goede
2018-10-30 16:24 ` Andy Shevchenko
2018-10-30 11:19 ` Hans de Goede
2018-10-30 14:38 ` Dean Wallace [this message]
2018-10-30 14:48 ` Hans de Goede
2018-10-30 15:03 ` Andy Shevchenko
2018-10-30 15:25 ` Pierre-Louis Bossart
2018-10-30 15:04 ` Pierre-Louis Bossart
2018-10-30 15:46 ` Hans de Goede
2018-10-30 16:02 ` Hans de Goede
2018-10-30 16:27 ` Pierre-Louis Bossart
2018-10-30 18:31 ` Hans de Goede
2018-10-30 16:03 ` Pierre-Louis Bossart
2018-10-30 16:04 ` Hans de Goede
2018-10-30 16:15 ` Dean Wallace
2018-10-31 11:04 ` Hans de Goede
2018-10-31 12:45 ` Dean Wallace
2018-10-31 20:07 ` Dean Wallace
2018-10-31 22:27 ` Pierre-Louis Bossart
2018-10-31 23:57 ` Dean Wallace
2018-11-01 10:37 ` Dean Wallace
2018-11-01 13:57 ` Hans de Goede
2018-11-01 14:28 ` Dean Wallace
2018-11-01 14:49 ` Hans de Goede
2018-11-01 15:29 ` Dean Wallace
2018-11-01 15:39 ` Dean Wallace
2018-11-01 15:50 ` Dean Wallace
2018-11-02 10:27 ` Hans de Goede
2018-11-02 11:15 ` Dean Wallace
2018-11-01 13:56 ` Hans de Goede
2018-10-30 18:56 ` Mogens Jensen
2018-10-30 19:10 ` Hans de Goede
2018-10-31 6:02 ` Mogens Jensen
2018-10-31 9:29 ` Hans de Goede
2018-10-31 10:03 ` Dean Wallace
2018-11-01 6:55 ` Mogens Jensen
2018-12-02 12:25 ` Hans de Goede
2019-01-17 5:58 ` Mogens Jensen
2019-01-17 9:12 ` Dean Wallace
2019-01-17 12:05 ` Hans de Goede
2019-01-17 13:05 ` Johannes Stezenbach
2019-01-17 13:16 ` Dean Wallace
2019-01-18 15:33 ` Hans de Goede
2019-01-17 19:30 ` Mogens Jensen
2019-01-18 15:35 ` Hans de Goede
2019-01-21 5:55 ` Mogens Jensen
2019-01-22 19:27 ` Pierre-Louis Bossart
2019-01-25 5:16 ` Mogens Jensen
2019-01-25 14:12 ` Pierre-Louis Bossart
2019-01-25 17:57 ` Pierre-Louis Bossart
2019-01-25 20:30 ` Andy Shevchenko
2019-01-24 10:35 ` Hans de Goede
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