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Subject: Re: [alsa-devel] [PATCH v2 3/5] ASoC: core: add support to
 snd_soc_dai_get_sdw_stream()
To:     Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Vinod Koul <vkoul@kernel.org>, Mark Brown <broonie@kernel.org>
Cc:     devicetree@vger.kernel.org, alsa-devel@alsa-project.org,
        bgoswami@codeaurora.org, linux-kernel@vger.kernel.org,
        plai@codeaurora.org, lgirdwood@gmail.com, robh+dt@kernel.org,
        spapothi@codeaurora.org
References: <20190813083550.5877-1-srinivas.kandagatla@linaro.org>
 <20190813083550.5877-4-srinivas.kandagatla@linaro.org>
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 <f0228cb4-0a6f-17f3-fe03-9be7f5f2e59d@linux.intel.com>
 <20190813191827.GI5093@sirena.co.uk>
 <cc360858-571a-6a46-1789-1020bcbe4bca@linux.intel.com>
 <20190813195804.GL5093@sirena.co.uk>
 <20190814041142.GU12733@vkoul-mobl.Dlink>
 <99d35a9d-cbd8-f0da-4701-92ef650afe5a@linux.intel.com>
 <5e08f822-3507-6c69-5d83-4ce2a9f5c04f@linaro.org>
 <53bb3105-8e85-a972-fce8-a7911ae4d461@linux.intel.com>
From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Message-ID: <95870089-25da-11ea-19fd-0504daa98994@linaro.org>
Date:   Wed, 9 Oct 2019 17:01:01 +0100
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On 09/10/2019 15:29, Pierre-Louis Bossart wrote:
> 
> 
> On 10/9/19 3:32 AM, Srinivas Kandagatla wrote:
>> Hi Pierre,
>>
>> On 14/08/2019 15:09, Pierre-Louis Bossart wrote:
>>>
>>>
>>> On 8/13/19 11:11 PM, Vinod Koul wrote:
>>>> On 13-08-19, 20:58, Mark Brown wrote:
>>>>> On Tue, Aug 13, 2019 at 02:38:53PM -0500, Pierre-Louis Bossart wrote:
>>>>>
>>>>>> Indeed. I don't have a full understanding of that part to be 
>>>>>> honest, nor why
>>>>>> we need something SoundWire-specific. We already abused the 
>>>>>> set_tdm_slot API
>>>>>> to store an HDaudio stream, now we have a rather confusing stream
>>>>>> information for SoundWire and I have about 3 other 'stream' 
>>>>>> contexts in
>>>>>> SOF... I am still doing basic cleanups but this has been on my 
>>>>>> radar for a
>>>>>> while.
>>>>>
>>>>> There is something to be said for not abusing the TDM slot API if 
>>>>> it can
>>>>> make things clearer by using bus-idiomatic mechanisms, but it does 
>>>>> mean
>>>>> everything needs to know about each individual bus :/ .
>>>>
>>>> Here ASoC doesn't need to know about sdw bus. As Srini explained, this
>>>> helps in the case for him to get the stream context and set the stream
>>>> context from the machine driver.
>>>>
>>>> Nothing else is expected to be done from this API. We already do a set
>>>> using snd_soc_dai_set_sdw_stream(). Here we add the 
>>>> snd_soc_dai_get_sdw_stream() to query
>>>
>>> I didn't see a call to snd_soc_dai_set_sdw_stream() in Srini's code?
>>
>>
>> There is a snd_soc_dai_get_sdw_stream() to get stream context and we 
>> add slave streams(amplifier in this case) to that context using 
>> sdw_stream_add_slave() in machine driver[1].
>>
>> Without this helper there is no way to link slave streams to stream 
>> context in non dai based setup like smart speaker amplifiers.
>>
>> Currently this driver is blocked on this patch, If you think there are 
>> other ways to do this, am happy to try them out.
> 
> So to be clear, you are *not* using snd_soc_dai_set_sdw_stream?
Yes, am not using snd_soc_dai_set_sdw_stream().

--srini
> 
> 
> 
> 
>