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From: "Clément Péron" <peron.clem@gmail.com>
To: Maxime Ripard <maxime@cerno.tech>
Cc: Chen-Yu Tsai <wens@csie.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>
Subject: Re: [PATCH v6 03/14] ASoC: sun4i-i2s: Change get_sr() and get_wss() to be more explicit
Date: Mon, 5 Oct 2020 15:35:18 +0200	[thread overview]
Message-ID: <CAJiuCcds_H-M6Y9Cb8eMmTgpsaC_ZQee97u260WvDe23yBVc7A@mail.gmail.com> (raw)
In-Reply-To: <20201005121419.mum4g5utdesvyg7a@gilmour.lan>

Hi Maxime,

On Mon, 5 Oct 2020 at 14:14, Maxime Ripard <maxime@cerno.tech> wrote:
>
> On Sat, Oct 03, 2020 at 04:19:39PM +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 when calling
> > get_wss() the function return 4 instead of 3.
> >
> > Replace this with a simpler switch case.
> >
> > Also drop the i2s params which is unused and return a simple int as
> > returning an error code could be out of range for an s8 and there is
> > no optim to return a s8 here.
> >
> > Fixes: 619c15f7fac9 ("ASoC: sun4i-i2s: Change SR and WSS computation")
> > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> > Signed-off-by: Clément Péron <peron.clem@gmail.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 1f577dbc20a6..8e497fb3de09 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;
> > +     }
> >
> > -     return (width - 16) / 4;
> > +     return -EINVAL;
> >  }
> >
> > -static s8 sun4i_i2s_get_wss(const struct sun4i_i2s *i2s, int width)
> > +static int sun4i_i2s_get_wss(unsigned int width)
> >  {
> > -     if (width < 16 || width > 32)
> > -             return -EINVAL;
> > -
> > -     if (width % 4)
> > -             return -EINVAL;
> > +     switch (width) {
> > +     case 16:
> > +             return 0x0;
> > +     case 20:
> > +             return 0x1;
> > +     case 24:
> > +             return 0x2;
> > +     case 32:
> > +             return 0x3;
> > +     }
>
> Like I said in the previous version, I'm not really sure why we need to
> use the hexadecimal representation here?

I'm not sure if there is a convention when to use hexa or when not to use it.

But these figures are taken from the User Manual where register
descriptions are written in Base 2 and default values are written in
Base 16.

It's easier to read them and check that the code follows the documentation, no ?

Indeed with 2 bits this doesn't change anything.
Do you want me to change them in decimal ?

Clement

>
> Maxime

  reply	other threads:[~2020-10-05 13:35 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-03 14:19 [PATCH v6 00/14] Add Allwinner H3/H5/H6/A64 HDMI audio Clément Péron
2020-10-03 14:19 ` [PATCH v6 01/14] ASoC: sun4i-i2s: Add support for H6 I2S Clément Péron
2020-10-03 14:19 ` [PATCH v6 02/14] ASoC: sun4i-i2s: Change set_chan_cfg() params Clément Péron
2020-10-05 12:13   ` Maxime Ripard
2020-10-05 13:23     ` Clément Péron
2020-10-12 12:15       ` Maxime Ripard
2020-10-13  1:15         ` Samuel Holland
2020-10-19 10:24           ` Maxime Ripard
2020-10-06  5:03     ` Samuel Holland
2020-10-12 12:20       ` Maxime Ripard
2020-10-03 14:19 ` [PATCH v6 03/14] ASoC: sun4i-i2s: Change get_sr() and get_wss() to be more explicit Clément Péron
2020-10-05 12:14   ` Maxime Ripard
2020-10-05 13:35     ` Clément Péron [this message]
2020-10-03 14:19 ` [PATCH v6 04/14] ASoC: sun4i-i2s: Set sign extend sample Clément Péron
2020-10-03 14:19 ` [PATCH v6 05/14] ASoc: sun4i-i2s: Add 20 and 24 bit support Clément Péron
2020-10-03 14:19 ` [PATCH v6 06/14] ASoC: sun4i-i2s: Fix sun8i volatile regs Clément Péron
2020-10-03 14:19 ` [PATCH v6 07/14] ASoC: sun4i-i2s: Fix setting of FIFO modes Clément Péron
2020-10-03 14:19 ` [PATCH v6 08/14] ASoC: sun4i-i2s: fix coding-style for callback definition Clément Péron
2020-10-05 12:14   ` Maxime Ripard
2020-10-03 14:19 ` [PATCH v6 09/14] dt-bindings: ASoC: sun4i-i2s: Add H6 compatible Clément Péron
2020-10-03 14:19 ` [PATCH v6 10/14] arm64: dts: allwinner: h6: Add I2S1 node Clément Péron
2020-10-03 14:19 ` [PATCH v6 11/14] arm64: dts: allwinner: a64: Add I2S2 node Clément Péron
2020-10-03 14:19 ` [PATCH v6 12/14] arm64: defconfig: Enable Allwinner i2s driver Clément Péron
2020-10-03 14:19 ` [PATCH v6 13/14] dt-bindings: sound: sun4i-i2s: Document H3 with missing RX channel possibility Clément Péron
2020-10-06 21:11   ` Rob Herring
2020-10-03 14:19 ` [PATCH v6 14/14] arm: dts: sunxi: h3/h5: Add I2S2 node Clément Péron

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