linux-kernel - Re: [PATCH] ASoC: sunxi: sun4i-i2s: Enable 32-bit audio formats

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Date: Wed, 27 Mar 2024 20:53:32 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>,
 John Watts <contact@...kia.org>
Cc: linux-sound@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
 John Watts <contact@...kia.org>
Subject: Re: [PATCH] ASoC: sunxi: sun4i-i2s: Enable 32-bit audio formats

Dne torek, 26. marec 2024 ob 04:50:03 CET je John Watts napisal(a):
> The I2S driver already supports and checks for 32-bit sample sizes,
> so indicate this size is available for use in the DAI driver.
> 
> This change has been tested on the T113-S3, but it should work just
> fine on older hardware as get_sr checks for sample size support
> correctly according to each core's datasheet.
> 
> Signed-off-by: John Watts <contact@...kia.org>
> ---
> This patch enables support for 32-bit audio in the sunxi I2S driver.
> 
> I have only tested this on the Allwinner T113 but I'm fairly
> certain it will work on older boards.
> ---
>  sound/soc/sunxi/sun4i-i2s.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index a736f632bf0b..aeea852141c1 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -1103,7 +1103,8 @@ static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
>  
>  #define SUN4I_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
>  			 SNDRV_PCM_FMTBIT_S20_LE | \
> -			 SNDRV_PCM_FMTBIT_S24_LE)
> +			 SNDRV_PCM_FMTBIT_S24_LE | \
> +			 SNDRV_PCM_FMTBIT_S32_LE)

I wish it would be that simple. SUN4I_FORMATS is cross section of all I2S
variants that are supported by this driver. If you check A10, you'll see that
it doesn't support S32.

If you want to add support for S32, you'll have to add new quirk for each
variant.

Best regards,
Jernej

>  
>  static struct snd_soc_dai_driver sun4i_i2s_dai = {
>  	.capture = {
> 
> ---
> base-commit: 72fb52fb0ac44b6a1edd9bc390e44bce3acccd26
> change-id: 20240326-sunxi_s32-f2ab25b8e688
> 
> Best regards,
>