linux-kernel - Re: [PATCH v3 3/7] ASoC: sun4i-i2s: Add support for H6 I2S

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Date:   Tue, 28 Apr 2020 10:13:21 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Marcus Cooper <codekipper@...il.com>
Subject: Re: [PATCH v3 3/7] ASoC: sun4i-i2s: Add support for H6 I2S

Hi,

On Sun, Apr 26, 2020 at 12:41:11PM +0200, Clément Péron wrote:
> From: Jernej Skrabec <jernej.skrabec@...l.net>
> 
> H6 I2S is very similar to that in H3, except it supports up to 16
> channels.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  sound/soc/sunxi/sun4i-i2s.c | 227 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 227 insertions(+)
> 
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 4198a5410bf9..a23c9f2a3f8c 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -124,6 +124,21 @@
>  #define SUN8I_I2S_RX_CHAN_SEL_REG	0x54
>  #define SUN8I_I2S_RX_CHAN_MAP_REG	0x58
>  
> +/* Defines required for sun50i-h6 support */
> +#define SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET_MASK	GENMASK(21, 20)
> +#define SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET(offset)	((offset) << 20)
> +#define SUN50I_H6_I2S_TX_CHAN_SEL_MASK		GENMASK(19, 16)
> +#define SUN50I_H6_I2S_TX_CHAN_SEL(chan)		((chan - 1) << 16)
> +#define SUN50I_H6_I2S_TX_CHAN_EN_MASK		GENMASK(15, 0)
> +#define SUN50I_H6_I2S_TX_CHAN_EN(num_chan)	(((1 << num_chan) - 1))
> +
> +#define SUN50I_H6_I2S_TX_CHAN_MAP0_REG	0x44
> +#define SUN50I_H6_I2S_TX_CHAN_MAP1_REG	0x48
> +
> +#define SUN50I_H6_I2S_RX_CHAN_SEL_REG	0x64
> +#define SUN50I_H6_I2S_RX_CHAN_MAP0_REG	0x68
> +#define SUN50I_H6_I2S_RX_CHAN_MAP1_REG	0x6C
> +
>  struct sun4i_i2s;
>  
>  /**
> @@ -469,6 +484,65 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
>  	return 0;
>  }
>  
> +static int sun50i_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;
> +	unsigned int lrck_period;
> +
> +	if (i2s->slots)
> +		slots = i2s->slots;
> +
> +	/* Map the channels for playback and capture */
> +	regmap_write(i2s->regmap, SUN50I_H6_I2S_TX_CHAN_MAP1_REG, 0x76543210);
> +	regmap_write(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_MAP1_REG, 0x76543210);
> +
> +	/* Configure the channels */
> +	regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
> +			   SUN50I_H6_I2S_TX_CHAN_SEL_MASK,
> +			   SUN50I_H6_I2S_TX_CHAN_SEL(channels));
> +	regmap_update_bits(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_SEL_REG,
> +			   SUN50I_H6_I2S_TX_CHAN_SEL_MASK,
> +			   SUN50I_H6_I2S_TX_CHAN_SEL(channels));
> +
> +	regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
> +			   SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM_MASK,
> +			   SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM(channels));
> +	regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
> +			   SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM_MASK,
> +			   SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM(channels));
> +
> +	switch (i2s->format & SND_SOC_DAIFMT_FORMAT_MASK) {
> +	case SND_SOC_DAIFMT_DSP_A:
> +	case SND_SOC_DAIFMT_DSP_B:
> +	case SND_SOC_DAIFMT_LEFT_J:
> +	case SND_SOC_DAIFMT_RIGHT_J:
> +		lrck_period = params_physical_width(params) * slots;
> +		break;
> +
> +	case SND_SOC_DAIFMT_I2S:
> +		lrck_period = params_physical_width(params);
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if (i2s->slot_width)
> +		lrck_period = i2s->slot_width;
> +
> +	regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
> +			   SUN8I_I2S_FMT0_LRCK_PERIOD_MASK,
> +			   SUN8I_I2S_FMT0_LRCK_PERIOD(lrck_period));
> +
> +	regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
> +			   SUN50I_H6_I2S_TX_CHAN_EN_MASK,
> +			   SUN50I_H6_I2S_TX_CHAN_EN(channels));
> +
> +	return 0;
> +}
> +
>  static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
>  			       struct snd_pcm_hw_params *params,
>  			       struct snd_soc_dai *dai)
> @@ -694,6 +768,108 @@ static int sun8i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s,
>  	return 0;
>  }
>  
> +static int sun50i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s,
> +				 unsigned int fmt)

The alignment is off here

> +{
> +	u32 mode, val;
> +	u8 offset;
> +
> +	/*
> +	 * DAI clock polarity
> +	 *
> +	 * The setup for LRCK contradicts the datasheet, but under a
> +	 * scope it's clear that the LRCK polarity is reversed
> +	 * compared to the expected polarity on the bus.
> +	 */

Did you check this or has it been copy-pasted?

Thanks!
Maxime

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