linux-kernel - Re: [PATCH 4/6] ASoC: fsl_asrc: Add memory to memory driver

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Date:   Thu, 29 Jun 2023 12:38:57 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     tfiga@...omium.org, m.szyprowski@...sung.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 4/6] ASoC: fsl_asrc: Add memory to memory driver

On Thu, Jun 29, 2023 at 09:37:51AM +0800, Shengjiu Wang wrote:
> Implement the ASRC memory to memory function using
> the v4l2 framework, user can use this function with
> v4l2 ioctl interface.
> 
> User send the output and capture buffer to driver and
> driver store the converted data to the capture buffer.
> 
> This feature can be shared by ASRC and EASRC drivers
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  sound/soc/fsl/Kconfig        |  13 +
>  sound/soc/fsl/Makefile       |   2 +
>  sound/soc/fsl/fsl_asrc_m2m.c | 878 +++++++++++++++++++++++++++++++++++
>  sound/soc/fsl/fsl_asrc_m2m.h |  48 ++

This feels like the bit where we interface v4l to ASoC should be a
separate library, there shouldn't be anything device specific about
getting an audio stream into a block of memory.  I'm thinking something
like the way we handle dmaengine here.

I've not dug into the code yet though.

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