linux-kernel - Re: [PATCH v4 03/22] ASoC: sun4i-i2s: Change get_sr() and get

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Date:   Mon, 21 Sep 2020 15:55:30 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.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>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v4 03/22] ASoC: sun4i-i2s: Change get_sr() and get_wss()
 to be more explicit

On Mon, Sep 21, 2020 at 12:27:12PM +0200, Clément Péron wrote:
> We are actually using a complex formula to just return a bunch of
> simple values. Also this formula is wrong for sun4i.

Just like the previous patch, this could use a bit more explanation,
like why it's a good thing, or how it's wrong on sun4i

> Replace this with a simpler switch case.
> 
> Also drop the i2s params not used.
> 
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  sound/soc/sunxi/sun4i-i2s.c | 69 +++++++++++++++++++++++--------------
>  1 file changed, 44 insertions(+), 25 deletions(-)
> 
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 0633b9fba3d7..11bbcbe24d6b 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -175,8 +175,8 @@ struct sun4i_i2s_quirks {
>  	unsigned int			num_mclk_dividers;
>  
>  	unsigned long (*get_bclk_parent_rate)(const struct sun4i_i2s *);
> -	s8	(*get_sr)(const struct sun4i_i2s *, int);
> -	s8	(*get_wss)(const struct sun4i_i2s *, int);
> +	int	(*get_sr)(unsigned int width);
> +	int	(*get_wss)(unsigned int width);
>  	int	(*set_chan_cfg)(const struct sun4i_i2s *i2s,
>  				unsigned int channels,	unsigned int slots,
>  				unsigned int slot_width);
> @@ -381,37 +381,56 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
>  	return 0;
>  }
>  
> -static s8 sun4i_i2s_get_sr(const struct sun4i_i2s *i2s, int width)
> +static int sun4i_i2s_get_sr(unsigned int width)
>  {
> -	if (width < 16 || width > 24)
> -		return -EINVAL;
> -
> -	if (width % 4)
> -		return -EINVAL;
> +	switch (width) {
> +	case 16:
> +		return 0x0;
> +	case 20:
> +		return 0x1;
> +	case 24:
> +		return 0x2;
> +	}

Why do we need an hex number here?

Also, why is the return type change needed?

Maxime