linux-kernel - Re: [PATCH v4 2/6] ASoC: sgtl5000: Improve VAG power and mute control

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Message-ID: <20190717233128.GB3079@sasha-vm>
Date:   Wed, 17 Jul 2019 19:31:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Igor Opaniuk <igor.opaniuk@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Mark Brown <broonie@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH v4 2/6] ASoC: sgtl5000: Improve VAG power and mute control

On Wed, Jul 17, 2019 at 01:48:43PM -0300, Fabio Estevam wrote:
>On Wed, Jul 17, 2019 at 1:30 PM Oleksandr Suvorov
><oleksandr.suvorov@...adex.com> wrote:
>>
>> Change VAG power on/off control according to the following algorithm:
>> - turn VAG power ON on the 1st incoming event.
>> - keep it ON if there is any active VAG consumer (ADC/DAC/HP/Line-In).
>> - turn VAG power OFF when there is the latest consumer's pre-down event
>>   come.
>> - always delay after VAG power OFF to avoid pop.
>> - delay after VAG power ON if the initiative consumer is Line-In, this
>>   prevents pop during line-in muxing.
>>
>> Also, according to the data sheet [1], to avoid any pops/clicks,
>> the outputs should be muted during input/output
>> routing changes.
>>
>> [1] https://www.nxp.com/docs/en/data-sheet/SGTL5000.pdf
>>
>> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
>> Reviewed-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
>> Fixes: 9b34e6cc3bc2 ("ASoC: Add Freescale SGTL5000 codec support")
>
>Reviewed-by: Fabio Estevam <festevam@...il.com>
>
>By the way, I prefer the description you put in the cover letter as it
>explicitly talks about a bug being fixed.

Yes. This patch describes itself as an improvement rather than a fix.

You need to add an explicit stable tag, rather than just cc us.
Something like:

	Cc: stable@...nel.org

--
Thanks,
Sasha