linux-kernel - Re: [PATCH v2 02/20] ASoC: sun4i-i2s: Add support for H6 I2S

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Date:   Sat, 5 Sep 2020 11:44:30 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 02/20] ASoC: sun4i-i2s: Add support for H6 I2S

Hi Samuel,

On Fri, 4 Sep 2020 at 05:16, Samuel Holland <samuel@...lland.org> wrote:
>
> Clément,
>
> On 9/3/20 3:30 PM, 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 | 221 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 221 insertions(+)
> >
> > diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> > index fabff7bcccbc..acf24f512f2c 100644
> > --- a/sound/soc/sunxi/sun4i-i2s.c
> > +++ b/sound/soc/sunxi/sun4i-i2s.c
>
> [snip]
>
> > @@ -474,6 +489,65 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
> >       return 0;
> >  }
> >
> > +static int sun50i_h6_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:
>
> These cases don't match the documentation: LEFT_J and RIGHT_J are documented to
> behave like I2S (lrck_period == slot_width), not like DSP_A/B (lrck_period ==
> slot_width * slots).
>
> > +             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;
>
> Here, i2s->slot_width is the number of bits for each slot, but in PCM mode, you
you mean TDM here right?

> need to multiply by the number of slots, like above.
>
> Also, there is already logic in sun4i_i2s_hw_params to use i2s->slot_width and
> i2s->slots. You could avoid the duplication by passing slot_width/slots as
> parameters to set_chan_cfg.

Thanks for the catch, I will fix this.

Regards,
Clement

>
> Regards,
> Samuel
>
> > +
> > +     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)
>
> [snip]