[alsa-devel] [PATCH v6 1/3] ASoC: Add initial support for multiple CPU DAIs

[Pierre-Louis Bossart]

>>> +static int snd_soc_init_single_cpu_dai(struct snd_soc_card *card,
>>> +				   struct snd_soc_dai_link *dai_link)
>>> +{
>>> +	if (dai_link->cpu_name || dai_link->cpu_of_node ||
>>> +					dai_link->cpu_dai_name) {
>>> +		dai_link->num_cpu_dai = 1;
>>> +		dai_link->cpu_dai = devm_kzalloc(card->dev,
>>> +				sizeof(struct snd_soc_dai_link_component),
>>> +				GFP_KERNEL);
>>> +
>>> +		if (!dai_link->cpu_dai)
>>> +			return -ENOMEM;
>>> +
>>> +		dai_link->cpu_dai[0].name = dai_link->cpu_name;
>>> +		dai_link->cpu_dai[0].of_node = dai_link->cpu_of_node;
>>> +		dai_link->cpu_dai[0].dai_name = dai_link->cpu_dai_name;
>> Question: is cpu_dai[i].of_node defined for i>0 in the multi cpu_dai case?
>>
> 
> Yes, it should be defined.

I have limited understanding of how cpu_of_node would be handled and if 
there is any guidance for DT folks on how to deal with multiple cpu_dais.

> 
>>> @@ -1644,7 +1751,7 @@ int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
>>>   	unsigned int dai_fmt)
>>>   {
>>>   	struct snd_soc_dai **codec_dais = rtd->codec_dais;
>>> -	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
>>> +	struct snd_soc_dai **cpu_dais = rtd->cpu_dais;
>>>   	unsigned int i;
>>>   	int ret;
>>> @@ -1659,35 +1766,44 @@ int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
>>>   		}
>>>   	}
>>> -	/* Flip the polarity for the "CPU" end of a CODEC<->CODEC link */
>> why was this comment removed?
>>
> 
> Looks like I messed up resolving ocnflicts while rebase
> 
>>>   	/* the component which has non_legacy_dai_naming is Codec */
>>> -	if (cpu_dai->component->driver->non_legacy_dai_naming) {
>> Not sure if the code refactoring below makes sense in a codec-codec link,
>> you probably wouldn't have multiple cpu_dais then, would you?
> 
> Yes, a valid point. You suggest to leave this piece of code as is ?

Not necessarily. I don't understand how the codec-codec and multi 
cpu_dais intersect, all I am asking for is a check if this change is 
needed or not.

>   
>>> -		unsigned int inv_dai_fmt;
>>> +	for (i = 0; i < rtd->num_cpu_dai; i++) {
>>> +		struct snd_soc_dai *cpu_dai = cpu_dais[i];
>>> +		unsigned int inv_dai_fmt, temp_dai_fmt;
>>> -		inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
>>> -		switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
>>> -		case SND_SOC_DAIFMT_CBM_CFM:
>>> -			inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
>>> -			break;
>>> -		case SND_SOC_DAIFMT_CBM_CFS:
>>> -			inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
>>> -			break;
>>> -		case SND_SOC_DAIFMT_CBS_CFM:
>>> -			inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
>>> -			break;
>>> -		case SND_SOC_DAIFMT_CBS_CFS:
>>> -			inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
>>> -			break;
>>> -		}
>>> +		temp_dai_fmt = dai_fmt;
>>> +		if (cpu_dai->component->driver->non_legacy_dai_naming) {
>>> -		dai_fmt = inv_dai_fmt;
>>> -	}
>>> +			inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
>>> -	ret = snd_soc_dai_set_fmt(cpu_dai, dai_fmt);
>>> -	if (ret != 0 && ret != -ENOTSUPP) {
>>> -		dev_warn(cpu_dai->dev,
>>> -			 "ASoC: Failed to set DAI format: %d\n", ret);
>>> -		return ret;
>>> +			switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
>>> +			case SND_SOC_DAIFMT_CBM_CFM:
>>> +				inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
>>> +				break;
>>> +
>>> +			case SND_SOC_DAIFMT_CBM_CFS:
>>> +				inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
>>> +				break;
>>> +
>>> +			case SND_SOC_DAIFMT_CBS_CFM:
>>> +				inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
>>> +				break;
>>> +
>>> +			case SND_SOC_DAIFMT_CBS_CFS:
>>> +				inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
>>> +				break;
>>> +
>>> +			}
>>> +
>>> +			temp_dai_fmt = inv_dai_fmt;
>>> +		}
>>> +
>>> +		ret = snd_soc_dai_set_fmt(cpu_dai, temp_dai_fmt);
>>> +		if (ret != 0 && ret != -ENOTSUPP) {
>>> +			dev_warn(cpu_dai->dev,
>>> +				"ASoC: Failed to set DAI format: %d\n", ret);
>>> +			return ret;
>>> +		}
>>>   	}
>>>   	
>>
>