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Message-ID: <d7c1fdb2-602f-ecb1-9b32-91b893e7f408@linaro.org>
Date: Tue, 13 Aug 2019 19:06:45 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
vkoul@...nel.org, broonie@...nel.org
Cc: devicetree@...r.kernel.org, alsa-devel@...a-project.org,
bgoswami@...eaurora.org, plai@...eaurora.org, lgirdwood@...il.com,
linux-kernel@...r.kernel.org, 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 13/08/2019 18:51, Pierre-Louis Bossart wrote:
> On 8/13/19 11:50 AM, Srinivas Kandagatla wrote:
>> Thanks for the review,
>>
>> On 13/08/2019 15:44, Pierre-Louis Bossart wrote:
>>> On 8/13/19 3:35 AM, Srinivas Kandagatla wrote:
>>>> On platforms which have smart speaker amplifiers connected via
>>>> soundwire and modeled as aux devices in ASoC, in such usecases machine
>>>> driver should be able to get sdw master stream from dai so that it can
>>>> use the runtime stream to setup slave streams.
>>>
>>> using the _set_sdw_stream? I don't fully get the sequence with the
>>> wording above.
>>
>> Yes, using set_sdw_stream().
>
> Maybe I am missing something here, but I don't see where the
> set_sdw_stream() is called.
sorry for the confusion. It was too quick reply. :-)
I was suppose to say sdw_stream_add_slave() instead of set_sdw_stream().
As Aux device is dailess there is no way to get hold of sdw stream
runtime for slave device associated with it.
Having snd_soc_dai_get_sdw_stream() would help machine driver to get
hold of sdw_stream_runtime from controller dai and setup slave streams
using sdw_stream_add_slave().
thanks,
srini
>
> Also I don't fully get the rule. set_sdw_stream() looks required,
> get_sdw_stream() is optional, is this what you are suggesting?
>
>>>
>>>>
>>>> soundwire already as a set function, get function would provide more
>>>> flexibility to above configurations.
>>>
>>> I am not clear if you are asking for both to be used, or get only or
>>> set only?
>>
>> It depends on the usecase, in db845c usecase [1] as Aux device is dai
>> less, machine driver is using get function to get hold of master
>> stream so that it can setup slave port config.
>>
>>
>> Looks like there is a typo in above like
>>
>> This was supposed to be "soundwire already has a set function, get
>> function would provide more flexibility to above configurations"
>>
>> [1]
>> https://git.linaro.org/landing-teams/working/qualcomm/kernel.git/tree/sound/soc/qcom/db845c.c?h=integration-linux-qcomlt
>>
>>
>> thanks,
>> srini
>>
>>>
>>>>
>>>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>>>> ---
>>>> include/sound/soc-dai.h | 10 ++++++++++
>>>> 1 file changed, 10 insertions(+)
>>>>
>>>> diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
>>>> index dc48fe081a20..1e01f4a302e0 100644
>>>> --- a/include/sound/soc-dai.h
>>>> +++ b/include/sound/soc-dai.h
>>>> @@ -202,6 +202,7 @@ struct snd_soc_dai_ops {
>>>> int (*set_sdw_stream)(struct snd_soc_dai *dai,
>>>> void *stream, int direction);
>>>> + void *(*get_sdw_stream)(struct snd_soc_dai *dai, int direction);
>>>> /*
>>>> * DAI digital mute - optional.
>>>> * Called by soc-core to minimise any pops.
>>>> @@ -410,4 +411,13 @@ static inline int
>>>> snd_soc_dai_set_sdw_stream(struct snd_soc_dai *dai,
>>>> return -ENOTSUPP;
>>>> }
>>>> +static inline void *snd_soc_dai_get_sdw_stream(struct snd_soc_dai
>>>> *dai,
>>>> + int direction)
>>>> +{
>>>> + if (dai->driver->ops->get_sdw_stream)
>>>> + return dai->driver->ops->get_sdw_stream(dai, direction);
>>>> + else
>>>> + return ERR_PTR(-ENOTSUPP);
>>>> +}
>>>> +
>>>> #endif
>>>>
>>>
>> _______________________________________________
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>> Alsa-devel@...a-project.org
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>
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