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

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Date:   Wed, 31 Oct 2018 10:03:43 +0000
From:   Dean Wallace <duffydack73@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Mogens Jensen <mogens-jensen@...tonmail.com>,
        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>,
        Carlo Caione <carlo@...lessm.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL)

On 31-10-18, Hans de Goede wrote:
> Hi,
> 
> On 31-10-18 07:02, Mogens Jensen wrote:
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Tuesday, October 30, 2018 7:10 PM, Hans de Goede <hdegoede@...hat.com> wrote:
> > 
> > > Hi,
> > > 
> > > On 30-10-18 19:56, Mogens Jensen wrote:
> > > 
> > > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > > > On Tuesday, October 30, 2018 4:04 PM, Hans de Goede hdegoede@...hat.com wrote:
> > > > 
> > > > > Hi,
> > > > > On 30-10-18 16:46, Hans de Goede wrote:
> > > > > 
> > > > > > Hi,
> > > > > > On 30-10-18 16:04, Pierre-Louis Bossart wrote:
> > > > > > 
> > > > > > > In addition I am not aware of any baytrail device using plt_clk_0, so moving a common machine driver such a cht_bsw_max98090_ti to use plt_clk0 only would break other devices (e.g. Rambi/Orco). Asking for both clocks to be on might work though,
> > > > > > 
> > > > > > Ok, so we need to have a DMI based quirk for the Swanky and maybe also
> > > > > > the clapper to use plt_clk_0 there. Asking for 2 clks if we only need
> > > > > > one does not seem like a good plan.
> > > > > 
> > > > > Dean, Mogens,
> > > > > To write a proper patch for this I'm going to need DMI strings
> > > > > from your devices.
> > > > > Can you please run (as normal user):
> > > > > grep . /sys/class/dmi/id/* 2> /dev/null
> > > > > And reply with the output of this command?
> > > > > I have attached the output from a coreboot seabios based clapper.
> > > 
> > > Thank you.
> > > 
> > > > Should I still test 0001-ASoC-intel-cht_bsw_max98090_ti-Use-pmc_plt_clk_0-ins.patch with SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH and asoundrc from Dean? There seems to have been some development in the case since that request was made.
> > > 
> > > Yes please test that, I expect that to also fix things for the
> > > Clapper, but I need to have that confirmed before submitting a
> > > patch upstream adding a quirk for the Clapper to use pmc_plt_clk_0
> > > instead of pmc_plt_clk_3.
> > > 
> > > Regards,
> > > 
> > > Hans
> > > 
> > Unfortunately I only have access to longterm kernel 4.14 for building/running on this system, and 0001-ASoC-intel-cht_bsw_max98090_ti-Use-pmc_plt_clk_0-ins.patch does not patch against 4.14.78. Can a test patch for 4.14 be created?
> 
> Can you run (as root):
> 
> for i in /sys/kernel/debug/clk/pmc_plt_clk_?; do echo -n "$i: "; cat $i/clk_flags; echo; done
> 
> When running a kernel with working audio?
> 
> Then I can confirm that the Clapper is also using pmc_plt_clk_0, so that I can
> fix this for the clapper for 4.18+
> 
> I've just checked the 4.14 sources and in 4.14 the SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH
> driver does not support mclk control yet, so for the 4.14 kernel the only way to
> fix this is to revert the 648e921888ad ("clk: x86: Stop marking clocks as CLK_IS_CRITICAL")
> commit.
> 
> Regards,
> 
> Hans
> 

Hi guys,
Morgens, If you can't test a recent kernel on your Clapper, I might be able to
give you a 'live' usb to boot with the kernel on, so you can quickly
test.  It's basically just archlinux iso with xfce and tools, with arch's
LTS and latest stable kernels.  If it will help.
-- 
Dean