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SubjectRe: Regression found (Stop-marking-clocks-as-CLK_IS_CRITICAL)
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, January 18, 2019 3:35 PM, Hans de Goede <hdegoede@redhat.com> wrote:

> Hi,
>
> On 1/17/19 8:30 PM, Mogens Jensen wrote:
>
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Thursday, January 17, 2019 12:05 PM, Hans de Goede hdegoede@redhat.com wrote:
> >
> > > Hi,
> > > On 17-01-19 10:12, Dean Wallace wrote:
> > >
> > > > Hi Hans, Mogens,
> > > > On 17-01-19, Mogens Jensen wrote:
> > > >
> > > > > Kernel is compiled with SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH and the quirk seems to have fixed the problem caused by commit 648e921888ad ("clk: x86: Stop marking clocks as CLK_IS_CRITICAL"), as sound is now working if running "speaker-test" on my system which is clean ALSA.
> > >
> > > Note being "clean ALSA" is really not a good thing now a days,
> > > for lots of things we depend on pulseaudio (like setting
> > > up UCM mixer profiles).
> >
> > I'm using UCM mixer profile from:
> > https://github.com/plbossart/UCM/tree/master/chtmax98090
> > This is enabled with:
> > alsaucm -c chtmax98090 set _verb HiFi set _enadev Speakers
> >
> > > > > Unfortunately, SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH driver is unusable on Clapper Chromebooks as audio played from everything but "speaker-test" as video players or web browsers is extremly low and sounds like played at 10x speed. At the same time kernel log is spammed with messages like this:
> > > > > max98090 i2c-193C9890:00: PLL unlocked
> > > > > intel_sst_acpi 80860F28:00: FW Version 01.0c.00.01
> > > > > writing to lpe: 00000000: 01 01 01 01 00 00 08 00 ff ff ff ff 55 00 00 00 ............U...
> > > > > writing to lpe: 00000000: 01 01 01 01 00 00 1a 00 ff ff ff ff 75 00 12 00 ............u...
> > > > > This is probably not related to the problem discussed in this thread, but the result is that I have to use the legacy driver SND_SOC_INTEL_BYT_MAX98090_MACH and therefore still has to revert commit 648e921888ad for sound to work.
> > > > > Is it possible to create a fix for SND_SOC_INTEL_BYT_MAX98090_MACH on kernel 4.19? Kernel 4.19 is a long term release so it would be very nice to have fix for this version upstream.
> > > >
> > > > I have been reverting "clk: x86: Stop marking clocks as CLK_IS_CRITICAL"
> > > > and the patch that initially added the quirk for swanky because of sound
> > > > instability issues as you described. I'm compiling vanilla Archlinux
> > > > kernel with SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH, using pulseaudio,
> > > > and have sound in all my apps.
> > > > Baytrail sound has always been a little touchy, especially using headset
> > > > with mic, but since the clk patch breaking sound and the quirk patch to
> > > > fix it, there is a lot more instability. Just running pavucontrol, or
> > > > plugging in headset sets it off. It's a head scratcher.
> > >
> > > Mogens, Dean, can you please try the SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH
> > > driver, without reverting any patches, with the attached patch on top and
> > > see if that helps?
> > > Thanks & Regards,
> > > Hans
> >
> > I have applied the patch to kernel 4.19.15 and unfortunately this has not solved the problems.
> > Audio generated from "speaker-test" is normal, but from everything else is very low and played at 10x speed. However, I'm not seeing the "max98090 i2c-193C9890:00: PLL unlocked" message in kernel log anymore, but it's still spammed with "writing to lpe: ...".
>
> Hmm, I've a feeling the problem is your using alsa directly, do you have
> dmix enabled ? You probably need dmix since the SST sound support
> only supports 48KHz AFAIK.
>
> Can you perhaps give things a try with pulseaudio ?
>
> Regards,
>
> Hans

You are absolutely correct, software mixing was apparently not enabled on my system and this caused the audio problems. I thought that dmix was enabled by default if hardware mixing was not supported. Thank you very much.

I was completely wrong about "SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH driver seems to be unusable on Clapper Chromebooks". Sorry about that.

To sum up, audio is working perfectly on my Clapper Chromebook running kernel 4.19.15 with SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH + "0001-ASoC-intel-cht_bsw_max98090_ti-Enable-codec-clock-on.patch", even better than before with the legacy driver.

The only minor annoyance I'm experiencing now, is a large amount of debug output from something in kernel log when audio is played on the system:

writing to lpe: 00000000: 01 01 01 01 00 00 08 00 ff ff ff ff 55 00 00 00 ............U...
writing to lpe: 00000000: 01 01 01 01 00 00 1a 00 ff ff ff ff 75 00 12 00 ............u...
...

Regards,

Mogens

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