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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
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