linux-kernel - Re: [PATCH v4 08/11] ASoC: jz4740-i2s: Support S20_LE and S24

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Message-Id: <VHIBFR.8XGKG1NT4PHX1@crapouillou.net>
Date:   Wed, 20 Jul 2022 12:56:19 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, linux-mips@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/11] ASoC: jz4740-i2s: Support S20_LE and S24_LE
 sample formats

Hi Aidan,

Le ven., juil. 8 2022 at 17:02:41 +0100, Aidan MacDonald 
<aidanmacdonald.0x0@...il.com> a écrit :
> The audio controller on JZ47xx SoCs can transfer 20- and 24-bit
> samples in the FIFO, so allow those formats to be used with the
> I2S driver. Although the FIFO doesn't care about the in-memory
> sample format, we only support 4-byte format variants because the
> DMA controller on these SoCs cannot transfer in 3-byte multiples.
> 
> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> ---
>  sound/soc/jz4740/jz4740-i2s.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/jz4740/jz4740-i2s.c 
> b/sound/soc/jz4740/jz4740-i2s.c
> index a41398c24d0e..9be2f3f1b376 100644
> --- a/sound/soc/jz4740/jz4740-i2s.c
> +++ b/sound/soc/jz4740/jz4740-i2s.c
> @@ -238,9 +238,15 @@ static int jz4740_i2s_hw_params(struct 
> snd_pcm_substream *substream,
>  	case SNDRV_PCM_FORMAT_S8:
>  		sample_size = 0;
>  		break;
> -	case SNDRV_PCM_FORMAT_S16:
> +	case SNDRV_PCM_FORMAT_S16_LE:


I had to lookup the macro to verify, but this is correct.

Reviewed-by: Paul Cercueil <paul@...pouillou.net>

Cheers,
-Paul

>  		sample_size = 1;
>  		break;
> +	case SNDRV_PCM_FORMAT_S20_LE:
> +		sample_size = 3;
> +		break;
> +	case SNDRV_PCM_FORMAT_S24_LE:
> +		sample_size = 4;
> +		break;
>  	default:
>  		return -EINVAL;
>  	}
> @@ -375,7 +381,9 @@ static const struct snd_soc_dai_ops 
> jz4740_i2s_dai_ops = {
>  };
> 
>  #define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
> -		SNDRV_PCM_FMTBIT_S16_LE)
> +			 SNDRV_PCM_FMTBIT_S16_LE | \
> +			 SNDRV_PCM_FMTBIT_S20_LE | \
> +			 SNDRV_PCM_FMTBIT_S24_LE)
> 
>  static struct snd_soc_dai_driver jz4740_i2s_dai = {
>  	.probe = jz4740_i2s_dai_probe,
> --
> 2.35.1
>