linux-kernel - Re: [PATCH v2 3/9] ASoC: audio-graph: Identify 'no

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Message-ID: <87pn7ofs19.wl-kuninori.morimoto.gx@renesas.com>
Date:   18 Aug 2020 14:23:39 +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>,
        <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 v2 3/9] ASoC: audio-graph: Identify 'no_pcm' DAI links for DPCM


Hi again

> PCM devices are created for FE dai links with 'no-pcm' flag as '0'.
> Such DAI links have CPU component which implement either pcm_construct()
> or pcm_new() at component or dai level respectively. Based on this,
> current patch exposes a helper function to identify such components
> and populate 'no_pcm' flag for DPCM DAI link.
> 
> This helps to have BE<->BE component links where PCM devices need
> not be created for CPU component involved in such links.
> 
> Signed-off-by: Sameer Pujar <spujar@...dia.com>
> ---
(snip)
> +static bool soc_component_is_pcm(struct snd_soc_dai_link_component *dlc)
> +{
> +	struct snd_soc_dai *dai = snd_soc_find_dai(dlc);
> +
> +	if (dai && (dai->component->driver->pcm_construct ||
> +		    dai->driver->pcm_new))
> +		return true;
> +
> +	return false;
> +}

This snd_soc_find_dai() will indicate WARNING
if .config has CONFIG_LOCKDEP for me.

Maybe implement it at soc-core.c with client_mutex lock
is needed.

Thank you for your help !!

Best regards
---
Kuninori Morimoto