linux-kernel - Re: [PATCH 2/2] ASoC: audio_graph_card2: Add support for variable slot widths

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Date:   Thu, 17 Feb 2022 12:51:50 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
CC:     <devicetree@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>,
        <robh+dt@...nel.org>, <broonie@...nel.org>
Subject: Re: [PATCH 2/2] ASoC: audio_graph_card2: Add support for variable
 slot widths

On 17/02/2022 00:23, Kuninori Morimoto wrote:
> 
> Hi Richard
> 
> Thank you for your patch.
> One comment from me.
> 
>>   struct asoc_simple_dai {
>>   	const char *name;
>>   	unsigned int sysclk;
>> @@ -26,6 +31,9 @@ struct asoc_simple_dai {
>>   	unsigned int rx_slot_mask;
>>   	struct clk *clk;
>>   	bool clk_fixed;
>> +	struct asoc_simple_tdm_width_map *tdm_width_map;
>> +	int n_tdm_widths;
>> +	struct snd_soc_dai *dai;
>>   };
> (snip)

(snip)

> (snip)
>> @@ -386,6 +479,8 @@ static int asoc_simple_init_dai(struct snd_soc_dai *dai,
>>   	if (!simple_dai)
>>   		return 0;
>>   
>> +	simple_dai->dai = dai;
> 
> Indeed the relationship between asoc_simple_dai and snd_soc_dai are
> very mystery, and current utils is using confusable naming.
> We want to have some better solution about there.
> 
> Having snd_soc_dai pointer inside asoc_simple_dai itself is not bad idea.
> But we can get snd_soc_dai pointer without it.
> 
> Please check asoc_simple_dai_init().
> Not tested, but we can replace the code like this ?
> 
> =>	struct snd_soc_dai *dai;
> 
> 	for_each_prop_dai_codec(props, i, pdai) {
> =>		dai = asoc_rtd_to_codec(rtd, i);
> 		ret = asoc_simple_set_tdm(dai, pdai, params);
> 		if (ret < 0)
> 			return ret;
> 	}
> 
> 
I first thought about doing it like that. But I was not sure whether it
is safe to assume [i] is the same entry for both arrays. If it is ok,
then I can use that and do not need to add the snd_soc_dai * to struct
asoc_simple_dai.

I will look at this and send a V2 set if it is ok.