linux-kernel - Re: [linux-sunxi] [PATCH v5 01/20] ASoC: sun4i-i2s: Add support for H6 I2S

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Message-ID: <CAJiuCcevtzX_+02r54q6tH0+bOF=BM=knnaxN+G3QW035F8gZQ@mail.gmail.com>
Date:   Mon, 28 Sep 2020 16:37:26 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v5 01/20] ASoC: sun4i-i2s: Add support for
 H6 I2S

Hi Chen-Yu,

On Mon, 28 Sep 2020 at 06:40, Chen-Yu Tsai <wens@...e.org> wrote:
>
> On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@...il.com> 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 | 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);

Regards,
Clement

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