linux-kernel - Re: [PATCH 20/21] ASoC: sun4i-i2s: Add support for TDM slots

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Message-ID: <c311e88a-fdd2-8a01-275e-675d98dc90ba@orpaltech.com>
Date:   Tue, 20 Aug 2019 08:46:30 +0300
From:   Sergey Suloev <ssuloev@...altech.com>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        lgirdwood@...il.com, broonie@...nel.org
Cc:     codekipper@...il.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 20/21] ASoC: sun4i-i2s: Add support for TDM slots

Hi, Maxime,

On 8/19/19 10:25 PM, Maxime Ripard wrote:
> From: Maxime Ripard <maxime.ripard@...tlin.com>
>
> The i2s controller supports TDM, for up to 8 slots. Let's support the TDM
> API.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> ---
>   sound/soc/sunxi/sun4i-i2s.c | 40 ++++++++++++++++++++++++++++++++------
>   1 file changed, 34 insertions(+), 6 deletions(-)
>
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 0dac09814b65..4f76daeaaed7 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -168,6 +168,8 @@ struct sun4i_i2s {
>   	struct reset_control *rst;
>   
>   	unsigned int	mclk_freq;
> +	unsigned int	slots;
> +	unsigned int	slot_width;
>   
>   	struct snd_dmaengine_dai_dma_data	capture_dma_data;
>   	struct snd_dmaengine_dai_dma_data	playback_dma_data;
> @@ -287,7 +289,7 @@ static bool sun4i_i2s_oversample_is_valid(unsigned int oversample)
>   
>   static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
>   				  unsigned int rate,
> -				  unsigned int channels,
> +				  unsigned int slots,
>   				  unsigned int word_size)
>   {
>   	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> @@ -335,7 +337,7 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
>   
>   	bclk_parent_rate = i2s->variant->get_bclk_parent_rate(i2s);
>   	bclk_div = sun4i_i2s_get_bclk_div(i2s, bclk_parent_rate,
> -					  rate, channels, word_size);
> +					  rate, slots, word_size);
>   	if (bclk_div < 0) {
>   		dev_err(dai->dev, "Unsupported BCLK divider: %d\n", bclk_div);
>   		return -EINVAL;
> @@ -419,6 +421,10 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
>   				  const struct snd_pcm_hw_params *params)
>   {
>   	unsigned int channels = params_channels(params);
> +	unsigned int slots = channels;
> +
> +	if (i2s->slots)
> +		slots = i2s->slots;
>   
>   	/* Map the channels for playback and capture */
>   	regmap_write(i2s->regmap, SUN8I_I2S_TX_CHAN_MAP_REG, 0x76543210);
> @@ -428,7 +434,6 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
>   	regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
>   			   SUN4I_I2S_CHAN_SEL_MASK,
>   			   SUN4I_I2S_CHAN_SEL(channels));
> -
>   	regmap_update_bits(i2s->regmap, SUN8I_I2S_RX_CHAN_SEL_REG,
>   			   SUN4I_I2S_CHAN_SEL_MASK,
>   			   SUN4I_I2S_CHAN_SEL(channels));
> @@ -452,10 +457,18 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
>   			       struct snd_soc_dai *dai)
>   {
>   	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +	unsigned int word_size = params_width(params);
>   	unsigned int channels = params_channels(params);
> +	unsigned int slots = channels;
>   	int ret, sr, wss;
>   	u32 width;
>   
> +	if (i2s->slots)
> +		slots = i2s->slots;
> +
> +	if (i2s->slot_width)
> +		word_size = i2s->slot_width;
> +
>   	ret = i2s->variant->set_chan_cfg(i2s, params);
>   	if (ret < 0) {
>   		dev_err(dai->dev, "Invalid channel configuration\n");
> @@ -477,15 +490,14 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
>   	if (sr < 0)
>   		return -EINVAL;
>   
> -	wss = i2s->variant->get_wss(i2s, params_width(params));
> +	wss = i2s->variant->get_wss(i2s, word_size);
>   	if (wss < 0)
>   		return -EINVAL;
>   
>   	regmap_field_write(i2s->field_fmt_wss, wss);
>   	regmap_field_write(i2s->field_fmt_sr, sr);
>   
> -	return sun4i_i2s_set_clk_rate(dai, params_rate(params),
> -				      channels, params_width(params));
> +	return sun4i_i2s_set_clk_rate(dai, params_rate(params), slots, word_size);
>   }
>   
>   static int sun4i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s,
> @@ -785,10 +797,26 @@ static int sun4i_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
>   	return 0;
>   }
>   
> +static int sun4i_i2s_set_tdm_slot(struct snd_soc_dai *dai,
> +				  unsigned int tx_mask, unsigned int rx_mask,
> +				  int slots, int slot_width)
> +{
> +	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +
> +	if (slots > 8)
> +		return -EINVAL;
> +
> +	i2s->slots = slots;
> +	i2s->slot_width = slot_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,
> +	.set_tdm_slot	= sun4i_i2s_set_tdm_slot,
>   	.trigger	= sun4i_i2s_trigger,
>   };
>   


it seems like you forgot to implement sun4i_i2s_dai_ops.set_bclk_ratio 
because, as I far as I understand, it should alter tdm slots 
functionality indirectly.


Thank you,
SS