linux-kernel - Re: [RFC PATCH 0/2] ASoC: soc-dai: add flag to mute and unmute stream during trigger.

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Message-ID: <ZV4hMR8oGQBSbnMl@hovoldconsulting.com>
Date:   Wed, 22 Nov 2023 16:41:37 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Cc:     broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        stable@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] ASoC: soc-dai: add flag to mute and unmute
 stream during trigger.

Hi Greg and Sasha,

On Fri, Oct 27, 2023 at 01:52:11PM +0200, Johan Hovold wrote:
> On Fri, Oct 27, 2023 at 11:57:45AM +0100, Srinivas Kandagatla wrote:
> > Click/Pop Noise was a long pending issue with WSA Codecs which are prone
> > to accumlate DC when ports are active but without any data streams.
> > There are multiple places in the current setup, where this could happen
> > in both startup as well as shutdown path.
> > 
> > This patchset adds a new flag mute_unmute_on_trigger to dai_ops to let
> > generic code do the mute/unmute on trigger.
> > 
> > This patches help fix those issues by making sure the PA is Muted/Unmuted
> > inline with the stream start/stop events.
> >
> > Srinivas Kandagatla (2):
> >   ASoC: soc-dai: add flag to mute and unmute stream during trigger
> >   ASoC: codecs: wsa883x: make use of new mute_unmute_on_trigger flag
> 
> I've verified that this fixes the pop sounds when starting and stopping
> a stream on the X13s, even if the click sound when killing pulseaudio
> (e.g. on reboot) is still there (as with the previous fixes).
> 
> Tested-by: Johan Hovold <johan+linaro@...nel.org>
> 
> If these are accepted, can we get them backported to 6.5 as well?

These fixes are now in 6.7-rc1 as

	f0220575e65a ("ASoC: soc-dai: add flag to mute and unmute stream during trigger")
	805ce81826c8 ("ASoC: codecs: wsa883x: make use of new mute_unmute_on_trigger flag")

As these fix a loud scary crackling noise on the Lenovo ThinkPad X13s,
is it possible to get these backported at least to stable 6.6 and 6.5?

Johan