[alsa-devel] [RFC PATCH 4/5] ASoC: SOF: Intel: hda: add SoundWire stream config/free callbacks

[Pierre-Louis Bossart]

On 9/4/19 11:55 AM, Vinod Koul wrote:
> On 04-09-19, 08:31, Pierre-Louis Bossart wrote:
>> On 9/4/19 2:35 AM, Vinod Koul wrote:
>>> On 22-08-19, 08:53, Pierre-Louis Bossart wrote:
>>>> Thanks for the review Guennadi
>>>>
>>>>>> +static int sdw_config_stream(void *arg, void *s, void *dai,
>>>>>> +			     void *params, int link_id, int alh_stream_id)
>>>>>
>>>>> I realise, that these function prototypes aren't being introduced by these
>>>>> patches, but just wondering whether such overly generic prototype is really
>>>>> a good idea here, whether some of those "void *" pointers could be given
>>>>> real types. The first one could be "struct device *" etc.
>>>>
>>>> In this case the 'arg' parameter is actually a private 'struct snd_sof_dev',
>>>> as shown below [1]. We probably want to keep this relatively opaque, this is
>>>> a context that doesn't need to be exposed to the SoundWire code.
>>>
>>> This does look bit ugly.
>>>
>>>> The dai and params are indeed cases where we could use stronger types, they
>>>> are snd_soc_dai and hw_params respectively. I don't recall why the existing
>>>> code is this way, Vinod and Sanyog may have the history of this.
>>>
>>> Yes we wanted to decouple the sdw and audio bits that is the reason why
>>> none of the audio types are used here, but I think it should be revisited
>>> and perhaps made as:
>>>
>>> sdw_config_stream(struct device *sdw, struct sdw_callback_ctx *ctx)
>>>
>>> where the callback context contains all the other args. That would make
>>> it look lot neater too and of course use real structs if possible
>>
>> the suggested sdw_callbback_ctx is really intel-specific at the moment, e.g.
>> the notion of link_id and alh_stream_id are due to the hardware, it's not
>> generic at all. And in the latest code we also pass the dai->id.
> 
> s/sdw_callback_ctx/intel_sdw_callback_ctx
> 
> Yes this code is intel specific and this would be intel specific too

ok, I'll fold all the fields in a structure then. That's a nice cleanup, 
thanks Guennadi and Vinod for the reviews.