linux-kernel - Re: [alsa-devel] [PATCH] ASoC: wm8962: fix lambda value

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Message-ID: <CAA+D8AP4XNNmQ72xG6gNevtu8i8TJ7AaQMMgXJMCPmv2VO0_HA@mail.gmail.com>
Date:   Fri, 13 Dec 2019 11:09:09 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        kstewart@...uxfoundation.org,
        guennadi.liakhovetski@...ux.intel.com,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        gregkh@...uxfoundation.org, Shengjiu Wang <shengjiu.wang@....com>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        patches@...nsource.cirrus.com, tglx@...utronix.de,
        allison@...utok.net
Subject: Re: [alsa-devel] [PATCH] ASoC: wm8962: fix lambda value

Hi

On Fri, Dec 13, 2019 at 12:54 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Thu, Dec 12, 2019 at 04:48:35PM +0000, Charles Keepax wrote:
> > On Wed, Dec 11, 2019 at 07:57:22PM +0800, Shengjiu Wang wrote:
> > > According to user manual, it is required that FLL_LAMBDA > 0
> > > in all cases (Integer and Franctional modes).
>
> > How well tested is this change, and is it addressing an issue you
> > have observed? I agree this does better fit the datasheet just a
> > little nervous as its an older part that has seen a lot of usage.
>
> I've got a feeling that requirement might've been added in later
> versions of the datasheet...

We encounter an issue that when Integer mode, the lambda=theta=0,
the output sound is slower than expected. After change lambda=1
the issue is gone.

Best regards
Wang Shengjiu