linux-kernel - Re: [PATCH v4 10/23] ASoC: simple-card: Wrong daifmt for CPU end of DPCM DAI link

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Date:   29 Jun 2020 09:56:27 +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 10/23] ASoC: simple-card: Wrong daifmt for CPU end of DPCM DAI link


Hi Sameer

>  simple-audio-card,dai-link@xxx {
>      format = "i2s";
>      bitclock-master=<&cpu1>;
>      frame-master=<&cpu1>;
> 
>      cpu1: cpu@0 {
>          ...
>      };
> 
>      codec@0 {
>          ...
>      };
> 
>      ...
>  };
> 
> In above case CPU is expected to be configured as a master and Codec as
> a slave device. But both CPU/Codec are being configured as slave devices.
> This happens because asoc_simple_parse_daifmt() uses Codec reference and
> sets up the 'dai_link->dai_fmt' accordingly while parsing both CPU and
> Codec.

I'm sorry but I don't 100% understand about this case...
asoc_simple_parse_daifmt() should work in this case

The reason why it needs codec node is that
SND_SOC_DAIFMT_CBx_CFx are "Codec" base Master/Slave.

Thank you for your help !!

Best regards
---
Kuninori Morimoto