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From:   Chen-Yu Tsai <wens@csie.org>
Date:   Mon, 28 Sep 2020 22:46:04 +0800
Message-ID: <CAGb2v64Ath4vm+QNky2Le6ickJJ68Q8DJs8k6kqW=xh7DxmnMg@mail.gmail.com>
Subject: Re: [linux-sunxi] [PATCH v5 01/20] ASoC: sun4i-i2s: Add support for
 H6 I2S
To:     =?UTF-8?B?Q2zDqW1lbnQgUMOpcm9u?= <peron.clem@gmail.com>
Cc:     Maxime Ripard <mripard@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Brown <broonie@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Marcus Cooper <codekipper@gmail.com>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        Linux-ALSA <alsa-devel@alsa-project.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-sunxi <linux-sunxi@googlegroups.com>
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On Mon, Sep 28, 2020 at 10:37 PM Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Chen-Yu,
>
> On Mon, 28 Sep 2020 at 06:40, Chen-Yu Tsai <wens@csie.org> wrote:
> >
> > On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@gmail.com> wrote:
> > >
> > > From: Jernej Skrabec <jernej.skrabec@siol.net>
> > >
> > > H6 I2S is very similar to that in H3, except it supports up to 16
> > > channels.
> > >
> > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > > Signed-off-by: Marcus Cooper <codekipper@gmail.com>
> > > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > > ---
> > >  sound/soc/sunxi/sun4i-i2s.c | 224 ++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 224 insertions(+)
> > >
> > > diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> > > index f23ff29e7c1d..2baf6c276280 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;
> > >
> > >  /**
> > > @@ -474,6 +489,62 @@ 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);
> >
> > Nit, since it supports up to 16 channels, you might want to map all 16 of them
> > now, instead of having to come back and fix it later.
>
> Thanks for the review. Do you mean there is missing MAP0 for RX/TX ?
>
> + regmap_write(i2s->regmap, SUN50I_H6_I2S_TX_CHAN_MAP0_REG, 0xFEDCBA98);
>   regmap_write(i2s->regmap, SUN50I_H6_I2S_TX_CHAN_MAP1_REG, 0x76543210);
> + regmap_write(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_MAP0_REG, 0xFEDCBA98);
>   regmap_write(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_MAP1_REG, 0x76543210);

Correct.

ChenYu

> Regards,
> Clement
>
> >
> > Code wise, this patch is
> >
> > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> >
> > I don't have a scope nor logic analyzer, so I wasn't able to participate in the
> > LRCK discussion.
>
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