linux-kernel - Re: [PATCH 03/10] ASoC: audio-graph: Support Codec with multiple endpoints

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Date:   Mon, 3 Aug 2020 17:32:00 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.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>,
        <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 03/10] ASoC: audio-graph: Support Codec with multiple
 endpoints


On 7/20/2020 10:43 AM, Kuninori Morimoto wrote:
> External email: Use caution opening links or attachments
>
>
> Hi Sameer
>
>>>> diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
>>>> index 1e20562..b1903f9 100644
>>>> --- a/sound/soc/generic/audio-graph-card.c
>>>> +++ b/sound/soc/generic/audio-graph-card.c
>>>> @@ -201,8 +201,7 @@ static void graph_parse_mclk_fs(struct device_node *top,
>>>>    static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
>>>>                                   struct device_node *cpu_ep,
>>>>                                   struct device_node *codec_ep,
>>>> -                               struct link_info *li,
>>>> -                               int dup_codec)
>>>> +                               struct link_info *li)
>>> This patch breaks DPCM connection which is used for MIXer
>> Could you please elaborate a bit more as to what is broken with this?
>> The problem I am trying to solve here is to have multiple endpoints
>> for Codec port.
> For example MIXer, it is like below.
> If you removes "dup_codec", it breaks MIXer and/or TDM split mode.
>
>          CPU0  ---+---- DAI
>                   |
>          CPU1  ---+
>
>          cpu {
>                  ports {
>                          port@0 {
>                                  cpu_0: endpoint {
>                                          remote-endpoint = <&codec_0>;
>                                  };
>                          };
>                          port@1 {
>                                  cpu_1: endpoint {
>                                          remote-endpoint = <&codec_1>;
>                                  };
>                          };
>                  };
>          };
>
>          codec {
>                  port {
>                          codec_0: endpoint {
>                                  remote-endpoint = <&cpu_0>;
>                          };
>                          codec_1: endpoint {
>                                  remote-endpoint = <&cpu_1>;
>                          };
>                  }
>          };

Thanks Kuninori for explaining above and for giving a background in an 
'off-list' thread. I will re-work on the patch by limiting the changes 
to specific flag so that it does not affect any other user.

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