[PATCH 3/6] ASoC: fsl_easrc: define functions for memory to memory usage

[Shengjiu Wang]

On Thu, Jun 29, 2023 at 7:00 PM Fabio Estevam <festevam at gmail.com> wrote:

> Hi Shengjiu,
>
> On Wed, Jun 28, 2023 at 11:10 PM Shengjiu Wang <shengjiu.wang at nxp.com>
> wrote:
> >
> > ASRC can be used on memory to memory case, define several
> > functions for m2m usage and export them as function pointer.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
>
> Could you please explain what is the benefit of using M2M in the EASRC
> driver?
>
> Users may want to get the ASRC output in the user space, then do mixing
with
other streams before sending to DAC.
so this patch-set is to use the v4l2 API for this usage, because there is
no such
API in ASoC.


> A few weeks ago, an imx8mn user reported that the EASRC with the
> mainline kernel introduces huge delays.
>
> Does M2M help with this aspect?
>
No, M2M can't help with the delays issue.   The delay issue maybe caused
by the buffer size or the prefilled data needs by EASRC.

Best regards
wang shengjiu

>
> Thanks
>
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