linux-kernel - Re: [PATCH 2/3] ASoC: fsl_asrc: Add support for i.MX952 platform

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Message-ID: <CAA+D8AP==mteo7ucx=R4eyPw+DpBUtzC7H1++_iZBMN1kkPJsA@mail.gmail.com>
Date: Thu, 29 Jan 2026 17:53:34 +0800
From: Shengjiu Wang <shengjiu.wang@...il.com>
To: Daniel Baluta <daniel.baluta@....nxp.com>
Cc: Shengjiu Wang <shengjiu.wang@....com>, 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, 
	Xiubo.Lee@...il.com, nicoleotsuka@...il.com, perex@...ex.cz, tiwai@...e.com, 
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/3] ASoC: fsl_asrc: Add support for i.MX952 platform

On Thu, Jan 29, 2026 at 5:17 PM Daniel Baluta <daniel.baluta@....nxp.com> wrote:
>
> On 1/28/26 09:18, Shengjiu Wang wrote:
>
> Add a compatible string and clock mapping table to support ASRC on the
> i.MX952 platform.
>
> 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.
>
> So need 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.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
>
> This patch does more than one logical change.
>
> I would split in two patches:
>
> - 1) introduce functionality to start ASRC before DMA.
>
> - 2) add imx952 support including clk_map and introduce fsl_asrc_imx952_data

Ok, will separate them.

best regards
Shengjiu Wang
>
> Thanks,
>
> Daniel.
>
>