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Thu, 29 Jan 2026 09:17:17 +0000 Received: from AS8PR04MB8247.eurprd04.prod.outlook.com ([fe80::e99:f504:ce75:9bed]) by AS8PR04MB8247.eurprd04.prod.outlook.com ([fe80::e99:f504:ce75:9bed%3]) with mapi id 15.20.9564.006; Thu, 29 Jan 2026 09:17:17 +0000 Content-Type: multipart/alternative; boundary="------------aexFGhz9upHKtlzg9pgEzqdf" Message-ID: <36309f30-8b83-4eaa-842e-c663edd8a439@oss.nxp.com> Date: Thu, 29 Jan 2026 11:20:11 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] ASoC: fsl_asrc: Add support for i.MX952 platform To: Shengjiu Wang , lgirdwood@gmail.com, broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, nicoleotsuka@gmail.com, perex@perex.cz, tiwai@suse.com, linuxppc-dev@lists.ozlabs.org References: <20260128071853.2602784-1-shengjiu.wang@nxp.com> <20260128071853.2602784-3-shengjiu.wang@nxp.com> Content-Language: en-US From: Daniel Baluta In-Reply-To: <20260128071853.2602784-3-shengjiu.wang@nxp.com> X-ClientProxiedBy: AM0PR02CA0165.eurprd02.prod.outlook.com (2603:10a6:20b:28d::32) To AS8PR04MB8247.eurprd04.prod.outlook.com (2603:10a6:20b:3f2::13) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB8247:EE_|AM9PR04MB8827:EE_ X-MS-Office365-Filtering-Correlation-Id: 64e829a4-e2c1-430c-86b1-08de5f1732ac X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|7416014|19092799006|1800799024|921020|8096899003; 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charset=UTF-8 Content-Transfer-Encoding: 8bit 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 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 Thanks, Daniel. --------------aexFGhz9upHKtlzg9pgEzqdf Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
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@nxp.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

Thanks,

Daniel.


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