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SubjectRe: [linux-sunxi] [PATCH 1/3] ASoC: sun4i-i2s: Add set_tdm_slot functionality
On Wed, Jan 24, 2018 at 10:10 PM,  <codekipper@gmail.com> wrote:
> From: Marcus Cooper <codekipper@gmail.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@gmail.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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