linux-kernel - Re: [alsa-devel] [PATCH v2 3/5] ASoC: core: add support to snd_soc_dai_get_sdw

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Date:   Wed, 9 Oct 2019 09:29:39 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Mark Brown <broonie@...nel.org>
Cc:     devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        bgoswami@...eaurora.org, linux-kernel@...r.kernel.org,
        plai@...eaurora.org, lgirdwood@...il.com, robh+dt@...nel.org,
        spapothi@...eaurora.org
Subject: Re: [alsa-devel] [PATCH v2 3/5] ASoC: core: add support to
 snd_soc_dai_get_sdw_stream()



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?