linux-kernel - Re: [PATCH 2/3] ASoC: fsl_esai: Add support for imx8qm

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Date:   Wed, 6 May 2020 10:33:23 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ASoC: fsl_esai: Add support for imx8qm

Hi

On Fri, May 1, 2020 at 6:23 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Fri, May 01, 2020 at 04:12:05PM +0800, Shengjiu Wang wrote:
> > The difference for esai on imx8qm is that DMA device is EDMA.
> >
> > EDMA requires the period size to be multiple of maxburst. Otherwise
> > the remaining bytes are not transferred and thus noise is produced.
>
> If this constraint comes from the DMA controller then normally you'd
> expect the DMA controller integration to be enforcing this - is there no
> information in the DMA API that lets us know that this constraint is
> there?

No, I can't find one API for this.
Do you have a recommendation?

best regards
wang shengjiu