linux-kernel - Re: [PATCH v3 2/4] ASoC: fsl_asrc_m2m: Add option to start ASRC before DMA device for M2M

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAEnQRZAgjyKYZEJ9FVqRsCfzLOqwbRZXahqMMNdJpP54NAQ1PQ@mail.gmail.com>
Date: Tue, 3 Feb 2026 10:35:27 +0200
From: Daniel Baluta <daniel.baluta@...il.com>
To: Shengjiu Wang <shengjiu.wang@....com>
Cc: lgirdwood@...il.com, broonie@...nel.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org, 
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, 
	linux-sound@...r.kernel.org, devicetree@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	shengjiu.wang@...il.com, Xiubo.Lee@...il.com, nicoleotsuka@...il.com, 
	perex@...ex.cz, tiwai@...e.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 2/4] ASoC: fsl_asrc_m2m: Add option to start ASRC
 before DMA device for M2M

On Tue, Feb 3, 2026 at 5:13 AM Shengjiu Wang <shengjiu.wang@....com> wrote:
>
> There is a limitation on i.MX952 that dma request is not cleared at the
> end of conversion with dma slave mode. Which causes sample is dropped
> from the input fifo on the second time if dma is triggered before the
> client device and EDMA may copy wrong data from output fifo as the output
> fifo is not ready in the beginning.
>
> The solution is to trigger asrc before dma on i.MX952, and add delay to
> wait output data is generated then start the EDMA for output, otherwise
> the m2m function has noise issues.
>
> So add an option to start ASRC first for M2M before ASRC is enabled on
> i.MX952.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>


Reviewed-by: Daniel Baluta <daniel.baluta@....com>