linux-kernel - Re: [linux-sunxi] [PATCH 1/3] ASoC: sun4i-i2s: Add set_tdm

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Date:   Mon, 29 Jan 2018 09:50:11 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Code Kipper <codekipper@...il.com>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        "Andrea Venturi (pers)" <be17068@...rbole.bo.it>
Subject: Re: [linux-sunxi] [PATCH 1/3] ASoC: sun4i-i2s: Add set_tdm_slot functionality

On Wed, Jan 24, 2018 at 10:10 PM,  <codekipper@...il.com> wrote:
> From: Marcus Cooper <codekipper@...il.com>
>
> Some codecs require a different amount of a bit clocks per frame than
> 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 | 23 +++++++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index dca1143c1150..d7a9141514cf 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -96,6 +96,7 @@
>  #define SUN8I_I2S_CTRL_BCLK_OUT                        BIT(18)
>  #define SUN8I_I2S_CTRL_LRCK_OUT                        BIT(17)
>
> +#define SUN8I_I2S_FMT0_LRCK_MAX_PERIOD         (GENMASK(17, 8) >> 8)
>  #define SUN8I_I2S_FMT0_LRCK_PERIOD_MASK                GENMASK(17, 8)
>  #define SUN8I_I2S_FMT0_LRCK_PERIOD(period)     ((period - 1) << 8)
>
> @@ -193,6 +194,9 @@ 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 {
> @@ -344,7 +348,7 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
>         if (i2s->variant->has_fmt_set_lrck_period)
>                 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));
>
>         return 0;
>  }
> @@ -418,7 +422,8 @@ 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)
> @@ -691,6 +696,19 @@ 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)
> +{
> +       struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +
> +       i2s->tdm_slots = slots;
> +
> +       i2s->slot_width = width;
> +
> +       return 0;
> +}
> +

IIRC some of the DAI controllers actually support TDM. Would this
change conflict with that in the future?

Thanks
ChenYu

>  static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
>         .hw_params      = sun4i_i2s_hw_params,
>         .set_fmt        = sun4i_i2s_set_fmt,
> @@ -698,6 +716,7 @@ static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
>         .shutdown       = sun4i_i2s_shutdown,
>         .startup        = sun4i_i2s_startup,
>         .trigger        = sun4i_i2s_trigger,
> +       .set_tdm_slot   = sun4i_i2s_set_dai_tdm_slot,
>  };
>
>  static int sun4i_i2s_dai_probe(struct snd_soc_dai *dai)
> --
> 2.16.0
>
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