linux-kernel - Re: [PATCH v1] ASoC: soc-pcm: Fix mute and unmute control for non-dynamic DAI links

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Message-ID: <317f4edc-0592-492f-8c3d-f0cdb0d013cd@kernel.org>
Date: Wed, 8 Oct 2025 17:12:37 +0100
From: Srinivas Kandagatla <srini@...nel.org>
To: Mohammad Rafi Shaik <mohammad.rafi.shaik@....qualcomm.com>,
 Srinivas Kandagatla <srini@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
 kernel@....qualcomm.com, prasad.kumpatla@....qualcomm.com,
 ajay.nandam@....qualcomm.com, stable@...r.kernel.org
Subject: Re: [PATCH v1] ASoC: soc-pcm: Fix mute and unmute control for
 non-dynamic DAI links



On 10/8/25 5:08 PM, Mohammad Rafi Shaik wrote:
> 
> 
> On 10/8/2025 7:16 PM, Srinivas Kandagatla wrote:
>>
>>
>> On 10/7/25 3:33 AM, Mohammad Rafi Shaik wrote:
>>> In setups where the same codec DAI is reused across multiple DAI
>>> links, mute controls via `snd_soc_dai_digital_mute()` is skipped for
>>
>> Please explain the problem.
>>
> In Qualcomm audioreach setup, if platform dai not specified in DT, then
> cpu dai using as platform and initialize as static dai-link and created
> pcm device and link-dynamic == false by default.
> 
> In existing setup if dynamic==false, it's skipping trigger snd-ops and
> the codec is always on mute state.
> 
>>> non-dynamic links. The trigger operations are not invoked when
>>> `dai_link->dynamic == 0`, and mute controls is currently conditioned
>>
>> I dont think any of the Qualcomm upstream platforms use this flag.
>>
> 
> Yes, we are using dynamic flag and it's set to true in Qualcomm platforms.
> 
> Please check: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/
> sound.git/tree/sound/soc/qcom/qdsp6/topology.c#n1093
> 
>>> only on `snd_soc_dai_mute_is_ctrled_at_trigger()`. This patch ensures
>>> that mute and unmute is applied explicitly for non-dynamic links.
>> How is this resolving the issue, mute on these codecs happens at trigger
>> level instead of prepare.
>>
> yes agree, but if link->dynamic==false the trigger ops not getting
> called, which leading to codec always on mute state.

This is because you are using something very different solution to what
ASoC kernel provides.

I dont think this is a problem with as long as you use kernel ABI..

This patch looks totally a hack from something that does not belong to
kernel, so is  NAK  from my side on this.

--srini


> 
> Thanks & Regards,
> Rafi.
> 
>> --srini
>>>
>>> Fixes: f0220575e65a ("ASoC: soc-dai: add flag to mute and unmute
>>> stream during trigger")
>>> Cc: stable@...r.kernel.org
>>> Signed-off-by: Mohammad Rafi Shaik
>>> <mohammad.rafi.shaik@....qualcomm.com>
>>> ---
>>>   sound/soc/soc-pcm.c | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
>>> index 2c21fd528afd..4ed829b49bc2 100644
>>> --- a/sound/soc/soc-pcm.c
>>> +++ b/sound/soc/soc-pcm.c
>>> @@ -949,7 +949,7 @@ static int __soc_pcm_prepare(struct
>>> snd_soc_pcm_runtime *rtd,
>>>               SND_SOC_DAPM_STREAM_START);
>>>         for_each_rtd_dais(rtd, i, dai) {
>>> -        if (!snd_soc_dai_mute_is_ctrled_at_trigger(dai))
>>> +        if (!snd_soc_dai_mute_is_ctrled_at_trigger(dai) || !rtd-
>>> >dai_link->dynamic)
>>>               snd_soc_dai_digital_mute(dai, 0, substream->stream);
>>>       }
>>>   @@ -1007,7 +1007,7 @@ static int soc_pcm_hw_clean(struct
>>> snd_soc_pcm_runtime *rtd,
>>>               soc_pcm_set_dai_params(dai, NULL);
>>>             if (snd_soc_dai_stream_active(dai, substream->stream) ==
>>> 1) {
>>> -            if (!snd_soc_dai_mute_is_ctrled_at_trigger(dai))
>>> +            if (!snd_soc_dai_mute_is_ctrled_at_trigger(dai) || !rtd-
>>> >dai_link->dynamic)
>>>                   snd_soc_dai_digital_mute(dai, 1, substream->stream);
>>>           }
>>>       }
>>
>