linux-kernel - Re: [PATCH 2/2] ALSA: hda/cs8409: Prevent pops and clicks during reboot

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Date:   Sat, 14 Aug 2021 08:41:40 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: Re: [PATCH 2/2] ALSA: hda/cs8409: Prevent pops and clicks during reboot

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@...nsource.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@...nsource.cirrus.com>
> > Signed-off-by: Vitaly Rodionov <vitalyr@...nsource.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