linux-kernel - Re: [PATCH v4 13/22] ASoC: tegra20: i2s: Filter out unsupported rates

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Message-ID: <Ybtbx8gQJaSsOjGM@orome>
Date:   Thu, 16 Dec 2021 16:31:19 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        Agneli <poczt@...tonmail.ch>, linux-tegra@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v4 13/22] ASoC: tegra20: i2s: Filter out unsupported rates

On Sat, Dec 04, 2021 at 05:37:16PM +0300, Dmitry Osipenko wrote:
> Support new nvidia,fixed-parent-rate device-tree property which instructs
> I2S that board wants parent clock rate to stay at a fixed rate. This allows
> to play audio over S/PDIF and I2S simultaneously. The root of the problem
> is that audio components on Tegra share the same audio PLL, and thus, only
> a subset of rates can be supported if we want to play audio simultaneously.
> Filter out audio rates that don't match parent clock rate if device-tree
> has the nvidia,fixed-parent-rate property.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  sound/soc/tegra/tegra20_i2s.c | 49 +++++++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)

Acked-by: Thierry Reding <treding@...dia.com>

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