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

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Date:   Thu, 2 Jul 2020 09:18:02 +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 6:22 AM, Kuninori Morimoto wrote:
> External email: Use caution opening links or attachments
>
>
> Hi Sameer
>
>>> At least my CPU driver doesn't use component:pcm_construct
>>> but is using DAI:pcm_new for some reasons.
>>> I'm not sure checking DAI:pcm here is enough, or not...
>> OK. If adding DAI:pcm_new above here is not sufficient, then a flag
>> can be used to describe FE component? or is there a better
>> alternative?

> soc_component_is_pcm() is called from simple_dai_link_of_dpcm :: "FE" side.

Yes I had to use this on "FE" side only because I wanted to find a real 
"FE" in FE<->BE and BE<->BE links. Please have a look at patch [23/23] 
for the sound DT binding I am using. Basically I want to connect 
multiple components in a chained fashion (FE <-> BE1 <-> BE2 ... <BEx>). 
Some of these BEs can be SoC components like resampler/mixer/mux/de-mux 
etc., the HW I am using has a cross bar which allows me to 
select/connect BEs in any order and I am trying to have the same 
flexibility here. Hence I only want to create PCM devices for real "FE" 
and trying to use simple-card as much as possible. More details about 
the HW and problems were discussed in [0].

[0] https://lkml.org/lkml/2020/4/30/519

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