[PATCH 2/2] ALSA: hda/cs8409: Prevent pops and clicks during reboot

[Takashi Iwai]

On Tue, 17 Aug 2021 13:28:21 +0200,
Vitaly Rodionov wrote:
> 
> On 14/08/2021 7:41 am, Takashi Iwai wrote:
> > On Fri, 13 Aug 2021 08:10:47 +0200,
> > Takashi Iwai wrote:
> >> On Thu, 12 Aug 2021 20:34:33 +0200,
> >> Vitaly Rodionov wrote:
> >>> From: Stefan Binding <sbinding at opensource.cirrus.com>
> >>>
> >>> During reboot, when the CS42L42 powers down, pops and clicks
> >>> may occur due to the codec not being shutdown gracefully.
> >>> This can be fixed by going through the suspend sequence,
> >>> which shuts down the codec cleanly inside the reboot_notify
> >>> hook, which is called on reboot.
> >>>
> >>> Signed-off-by: Stefan Binding <sbinding at opensource.cirrus.com>
> >>> Signed-off-by: Vitaly Rodionov <vitalyr at opensource.cirrus.com>
> >> I hold this one for now, as there is a fix series that deprecates the
> >> reboot_notify callback of HD-audio by forcibly doing runtime-suspend
> >> at shutdown.  Please check the three patches in
> >>    https://bugzilla.kernel.org/show_bug.cgi?id=214045
> >>
> >> I'm going to submit those soon in anyway.
> 
> Hi Takashi,
> 
> Thanks for letting us know. We have tested against for-next branch and
> we have an issue.
> 
> Loud pops on reboot. It looks like suspend have never been called on
> reboot or shutdown for us.

OK, we need to track down the cause.

Does the noise persist if the codec has been runtime-suspended
beforehand?  You can check the status in sysfs.


thanks,

Takashi