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Subject: Re: [PATCH 5.3 112/112] ASoC: sgtl5000: add ADC mute control
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mark Brown <broonie@kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <stable@vger.kernel.org>,
        Oleksandr Suvorov <oleksandr.suvorov@toradex.com>,
        Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        Igor Opaniuk <igor.opaniuk@toradex.com>,
        Fabio Estevam <festevam@gmail.com>
References: <20191016214844.038848564@linuxfoundation.org>
 <20191016214907.599726506@linuxfoundation.org>
 <20191016220044.GB11473@sirena.co.uk> <20191016221025.GA990599@kroah.com>
 <20191016223518.GC11473@sirena.co.uk> <20191016232358.GA994597@kroah.com>
From:   Richard Leitner <richard.leitner@skidata.com>
Message-ID: <de9630e5-341f-b48d-029a-ef1a516bf820@skidata.com>
Date:   Thu, 17 Oct 2019 11:20:32 +0200
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On 17/10/2019 01:23, Greg Kroah-Hartman wrote:
> On Wed, Oct 16, 2019 at 11:35:18PM +0100, Mark Brown wrote:
>> On Wed, Oct 16, 2019 at 03:10:25PM -0700, Greg Kroah-Hartman wrote:
>>> On Wed, Oct 16, 2019 at 11:00:44PM +0100, Mark Brown wrote:
>>>> On Wed, Oct 16, 2019 at 02:51:44PM -0700, Greg Kroah-Hartman wrote:
>>>>> From: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
>>
>>>>> commit 694b14554d75f2a1ae111202e71860d58b434a21 upstream.
>>
>>>>> This control mute/unmute the ADC input of SGTL5000
>>>>> using its CHIP_ANA_CTRL register.
>>
>>>> This seems like a new feature and not an obvious candidate for stable?
>>
>>> there was a long email from Richard that said:
>>> 	Upstream commit 631bc8f0134a ("ASoC: sgtl5000: Fix of unmute
>>> 	outputs on probe"), which is e9f621efaebd in v5.3 replaced
>>> 	snd_soc_component_write with snd_soc_component_update_bits and
>>> 	therefore no longer cleared the MUTE_ADC flag. This caused the
>>> 	ADC to stay muted and recording doesn't work any longer. This
>>> 	patch fixes this problem by adding a Switch control for
>>> 	MUTE_ADC.
>>
>>> That's why I took this.  If this isn't true, I'll be glad to drop this.
>>
>> That's probably not an appropriate fix for stable - it's going to add a
>> new control which users will need to manually set (or hope their
>> userspace automatically figures out that it should set for them, more
>> advanced userspaces like PulseAudio should) which isn't a drop in fix.
>> You could either drop the backport that was done for zero cross or take
>> a new patch that clears the MUTE_ADC flag (rather than punting to
>> userspace to do so), or just be OK with what you've got at the minute
>> which might be fine given the lack of user reports.
> 
> Ok, I'll gladly go drop it, thanks!

Mark, thanks for the clarification! I haven't thought of breaking 
anything with the backport as it worked fine for our application.

Greg, just to be sure:

Are you going to drop this patch and revert e9f621efaebd for v5.3?

Or should I send a patch which clears the MUTE_ADC flag like Mark
suggested?

thanks & regards;Richard.L