linux-kernel - Re: [PATCH] ASoC: sgtl5000: add support for a fixed sysclk frequency

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Message-ID: <CAOMZO5D-2iFsAUk2Ldo4RD5Xg71Q5HOBuasYc0t=tV3hZbaO2g@mail.gmail.com>
Date:   Mon, 16 Oct 2017 08:51:01 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>
Cc:     Fabio Estevam <fabio.estevam@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Richard Leitner <richard.leitner@...data.com>,
        Bhumika Goyal <bhumirks@...il.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] ASoC: sgtl5000: add support for a fixed sysclk frequency

Hi Jakob,

On Mon, Oct 16, 2017 at 7:46 AM, Jakob Unterwurzacher
<jakob.unterwurzacher@...obroma-systems.com> wrote:
> Hi Fabio, that’s interesting.
>
> Looks like the fsl,imx-audio-sgtl5000 sound card driver that is used on the imx51-babbage
> does not try to adjust MCLK in response to the playback sample rate.
>
> The simple-audio-card driver does that (it calls snd_soc_dai_set_sysclk whenever playback
> starts).

Could you please test this with linux-next tree?

Looks like that the recent b0a7043d5c2c("ASoC: fsl_ssi: Caculate bit
clock rate using slot number and width") would avoid the issue.

Regards,

Fabio Estevam