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

[Takashi Iwai]

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.

The removal of reboot_notifier landed in my for-next branch now.
Please rebase and adapt the changes appropriately.  In short, the
runtime suspend is applied at the shutdown, so the workaround is
needed only for suspend.


thanks,

Takashi