linux-kernel - Re: [linux-sunxi] [PATCH v5 05/20] ASoC: sun4i-i2s: Set sign extend sample

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Message-ID: <CAGb2v66vJpCUc3xAHt7sHXKguc7ma+0kSjX=5Wp5VTdHeYQa5Q@mail.gmail.com>
Date:   Mon, 28 Sep 2020 14:52:05 +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 05/20] ASoC: sun4i-i2s: Set sign extend sample

On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@...il.com> wrote:
>
> From: Marcus Cooper <codekipper@...il.com>
>
> On the newer SoCs such as the H3 and A64 this is set by default
> to transfer a 0 after each sample in each slot. However the A10
> and A20 SoCs that this driver was developed on had a default
> setting where it padded the audio gain with zeros.
>
> This isn't a problem while we have only support for 16bit audio
> but with larger sample resolution rates in the pipeline then SEXT
> bits should be cleared so that they also pad at the LSB. Without
> this the audio gets distorted.
>
> Set sign extend sample for all the sunxi generations even if they
> are not affected. This will keep consistency and avoid relying on
> default.
>
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> Signed-off-by: Clément Péron <peron.clem@...il.com>

Reviewed-by: Chen-Yu Tsai <wens@...e.org>