linux-kernel - Re: [linux-sunxi] [PATCH v5 03/20] ASoC: sun4i-i2s: Change get_sr() and get

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Message-ID: <CAGb2v65c2NzjxN4FSksvzQKOvZz0e9ccsKT9OuLpmUVr_WNtzQ@mail.gmail.com>
Date:   Mon, 28 Sep 2020 13:02:12 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Clément Péron <peron.clem@...il.com>
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 03/20] ASoC: sun4i-i2s: Change get_sr()
 and get_wss() to be more explicit

On Mon, Sep 28, 2020 at 12:37 PM Chen-Yu Tsai <wens@...e.org> wrote:
>
> On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@...il.com> 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

BTW, it is entirely possible that the compiler optimizes your switch-case
back into the original complex formula you replaced. :)

> > 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.
> >
> > Signed-off-by: Clément Péron <peron.clem@...il.com>
>
> Fixes: 619c15f7fac9 ("ASoC: sun4i-i2s: Change SR and WSS computation")
>
> Reviewed-by: Chen-Yu Tsai <wens@...e.org>