linux-kernel - Re: [PATCH v4 15/23] ASoC: soc-core: Identify 'no

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Date:   Thu, 2 Jul 2020 15:26:21 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
CC:     <spujar@...dia.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <robh+dt@...nel.org>, <lgirdwood@...il.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <digetx@...il.com>, <alsa-devel@...a-project.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>,
        <nwartikar@...dia.com>, <swarren@...dia.com>,
        <nicoleotsuka@...il.com>
Subject: Re: [PATCH v4 15/23] ASoC: soc-core: Identify 'no_pcm' DAI links for
 DPCM



On 7/2/2020 2:20 PM, Kuninori Morimoto wrote:
> External email: Use caution opening links or attachments
>
>
> Hi Sameer
>
>>> I wonder component->driver->non_legacy_dai_naming can't work for you ?
>> I see currently in simple-card driver that, BE<->BE link would be
>> treated as CODEC<->CODEC link if 'non_legacy_dai_naming' flag is set
>> at both ends of BE. Do we need to set this flag for all BE?
>> However I am not sure how this will work out for a BE<->BE DPCM DAI
>> link considering the fact that I want to use chain of components and I
>> guess routing map would get complicated. Also going by the flag name
>> it was not meant to differentiate between a FE and BE?
> OK, non_legacy_dai_naming was just my quick idea.

>
> Maybe your soc_component_is_pcm() idea can work,
> but it seems a littl bit hackish for me.
> So, can you please
>
> 1) Add soc_component_is_pcm() on simple-card, not soc-core ?
>     Maybe we can move it to soc-core later,
>     but want to keep it under simple-card, so far.
>
> 2) Use it with data->component_chaining, and some comment ?
>     non component_chaining user doesn't get damage in worst case,
>     and easy to understand.
>
>          /*
>           * This is for BE<->BE connection.
>           * It needs to ...
>           * It is assumng ...
>           * Note is ...
>           */
>          if (data->component_chaining &&
>              !soc_component_is_pcm(cpus))
>                  dai_link->no_pcm = 1;
>
> 3) maybe you can reuse snd_soc_find_dai() for soc_component_is_pcm() ?
>
>          dai = snd_soc_find_dai(dlc);
>          if (dai &&
>              (dai->pcm_new || dai->component->driver->pcm_construct))
>                  return xxx

Sounds fine, I can make changes as per above points. Thanks.

>
> Thank you for your help !!
>
> Best regards
> ---
> Kuninori Morimoto