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

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Date:   02 Jul 2020 17:50:50 +0900
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     <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


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

Thank you for your help !!

Best regards
---
Kuninori Morimoto