linux-kernel - Re: [PATCH linux-next 09/10] ASoC: rsnd: add busif property to dai stream

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Date:   Fri, 28 Sep 2018 00:21:06 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     <jiada_wang@...tor.com>
Cc:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <twischer@...adit-jv.com>,
        <dragos_tarcatu@...tor.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH linux-next 09/10] ASoC: rsnd: add busif property to dai stream


Hi Jiada


> SSI may use different busif for data transfer, this patch
> adds busif property to each dai stream, to indicate the
> busif used by playback/capture stream.
(snip)
> +	io_playback->busif = rsnd_busif_get(priv, dai_i);
> +	io_capture->busif  = rsnd_busif_get(priv, rsnd_rdai_nr(priv) + dai_i);
(snip)
> +	busif = devm_kcalloc(dev, 2 * nr, sizeof(*busif), GFP_KERNEL);
(snip)
> @@ -456,6 +456,7 @@ struct rsnd_dai_stream {
>  	struct rsnd_mod *dma;
>  	struct rsnd_dai *rdai;
>  	struct device *dmac_dev; /* for IPMMU */
> +	struct rsnd_kctrl_cfg_s *busif;
>  	u32 parent_ssi_status;
>  };

It looks very complex to me.
Why don't you just have "busif" on rsnd_dai_stream, instead of "*busif" ?

>  int rsnd_ssi_get_busif(struct rsnd_dai_stream *io)
>  {
> -	return 0; /* BUSIF0 only for now */
> +	if (!rsnd_ssi_use_busif(io))
> +		return 0;
> +
> +	return io->busif->val;
>  }

Who/How update val ?