linux-kernel - Re: [PATCH v8 04/14] ASoC: sun4i-i2s: Set sign extend sample

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Message-ID: <20201027175032.utw23rtbds6fwrbw@gilmour.lan>
Date:   Tue, 27 Oct 2020 18:50:32 +0100
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 v8 04/14] ASoC: sun4i-i2s: Set sign extend sample

On Mon, Oct 26, 2020 at 07:52:29PM +0100, Clément Péron 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>
> Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> Signed-off-by: Clément Péron <peron.clem@...il.com>

Acked-by: Maxime Ripard <mripard@...nel.org>

Maxime

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