linux-kernel - Re: [PATCH v4 5/9] ASoC: sun4i-i2s: Add set_tdm

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Date:   Tue, 4 Jun 2019 09:49:40 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     codekipper@...il.com
Cc:     wens@...e.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, lgirdwood@...il.com,
        broonie@...nel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, be17068@...rbole.bo.it
Subject: Re: [PATCH v4 5/9] ASoC: sun4i-i2s: Add set_tdm_slot functionality

On Mon, Jun 03, 2019 at 07:47:31PM +0200, codekipper@...il.com wrote:
> From: Marcus Cooper <codekipper@...il.com>
>
> Some codecs require a different amount of a bit clocks per frame than

Which codec? And what are the actual requirements?

> what is calculated by the sample width. Use the tdm slot bindings to
> provide this mechanism.
>
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> ---
>  sound/soc/sunxi/sun4i-i2s.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 329883750d6f..bca73b3c0d74 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -186,6 +186,9 @@ struct sun4i_i2s {
>  	struct regmap_field	*field_rxchansel;
>
>  	const struct sun4i_i2s_quirks	*variant;
> +
> +	unsigned int	tdm_slots;
> +	unsigned int	slot_width;
>  };
>
>  struct sun4i_i2s_clk_div {
> @@ -337,7 +340,7 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
>  	if (i2s->variant->is_h3_i2s_based)
>  		regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
>  				   SUN8I_I2S_FMT0_LRCK_PERIOD_MASK,
> -				   SUN8I_I2S_FMT0_LRCK_PERIOD(32));
> +				   SUN8I_I2S_FMT0_LRCK_PERIOD(word_size));

This is an unrelated change, it should be in a separate patch.

>
>  	/* Set sign extension to pad out LSB with 0 */
>  	regmap_field_write(i2s->field_fmt_sext, 0);
> @@ -414,7 +417,8 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
>  			   sr + i2s->variant->fmt_offset);
>
>  	return sun4i_i2s_set_clk_rate(dai, params_rate(params),
> -				      params_width(params));
> +				      i2s->tdm_slots ?
> +				      i2s->slot_width : params_width(params));
>  }
>
>  static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
> @@ -657,11 +661,25 @@ static int sun4i_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
>  	return 0;
>  }
>
> +static int sun4i_i2s_set_dai_tdm_slot(struct snd_soc_dai *dai,
> +	unsigned int tx_mask, unsigned int rx_mask,
> +	int slots, int width)

The alignment after the wraping should be at the opening parenthesis.

> +{
> +	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +
> +	i2s->tdm_slots = slots;
> +
> +	i2s->slot_width = width;
> +
> +	return 0;
> +}
> +
>  static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
>  	.hw_params	= sun4i_i2s_hw_params,
>  	.set_fmt	= sun4i_i2s_set_fmt,
>  	.set_sysclk	= sun4i_i2s_set_sysclk,
>  	.trigger	= sun4i_i2s_trigger,
> +	.set_tdm_slot	= sun4i_i2s_set_dai_tdm_slot,

Please sort them by alphabetical order.

Thanks!
Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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