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Received: from AM0PR04MB7044.eurprd04.prod.outlook.com (2603:10a6:208:191::20) by VI2PR04MB11170.eurprd04.prod.outlook.com (2603:10a6:800:299::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9818.32; Mon, 20 Apr 2026 10:06:49 +0000 Received: from AM0PR04MB7044.eurprd04.prod.outlook.com ([fe80::bab2:d15c:fcf8:ef2b]) by AM0PR04MB7044.eurprd04.prod.outlook.com ([fe80::bab2:d15c:fcf8:ef2b%4]) with mapi id 15.20.9818.032; Mon, 20 Apr 2026 10:06:49 +0000 From: Shengjiu Wang To: vkoul@kernel.org, Frank.Li@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, dmaengine@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH V3] dmaengine: imx-sdma: Fix SPBA bus detection on multi-SPBA platforms Date: Mon, 20 Apr 2026 18:08:54 +0800 Message-Id: <20260420100854.2095549-1-shengjiu.wang@nxp.com> X-Mailer: git-send-email 2.37.1 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MAXP287CA0015.INDP287.PROD.OUTLOOK.COM (2603:1096:a00:49::27) To AM0PR04MB7044.eurprd04.prod.outlook.com (2603:10a6:208:191::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM0PR04MB7044:EE_|VI2PR04MB11170:EE_ X-MS-Office365-Filtering-Correlation-Id: 4884be95-ed86-459a-c688-08de9ec48951 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|52116014|19092799006|366016|1800799024|38350700014|18002099003|56012099003; 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charset="utf-8" i.MX8M platforms have multiple SPBA buses under different AIPS buses. The current code searches the entire device tree and returns the first SPBA bus found, which may not be under the same AIPS bus as the SDMA controller. This breaks SDMA P2P transfers because the SDMA script needs to know if peripherals are on SPBA or AIPS to configure watermark levels correctly. Using the wrong SPBA bus causes DMA timeouts and transfer failures. Fix by searching for the SPBA bus under the SDMA's parent node (AIPS) first, then falling back to a global search for backward compatibility. Example device tree showing the issue: aips1 { spba1 { sai@...; }; /* Correct SPBA for sdma1 */ sdma1@...; }; aips2 { spba2 { uart@...; }; /* Wrong SPBA - found first by old code */ }; Fixes: 8391ecf465ec ("dmaengine: imx-sdma: Add device to device support") Cc: stable@vger.kernel.org Signed-off-by: Shengjiu Wang Reviewed-by: Frank Li --- changs in v3: - add fallback to a global search for backward compatibility, which is to address comments from sashiko.dev - update commit subject and commit message - add comments in code. - add Cc stable tag - Don't add Frank's RB on v2 as there are several other changes. changes in v2: - add fixes tag - use __free(device_node) for auto release.=20 drivers/dma/imx-sdma.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 3d527883776b..592705af2319 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -2364,7 +2364,18 @@ static int sdma_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, ret, "failed to register controller\n"); =20 - spba_bus =3D of_find_compatible_node(NULL, NULL, "fsl,spba-bus"); + /* + * On i.MX8M platforms with multiple SPBA buses, we need to find + * the SPBA bus that's under the same AIPS bus as this SDMA controller. + * First check the SDMA's parent (AIPS bus) for a child SPBA bus. + * If not found, fall back to searching the entire device tree for + * backward compatibility with older platforms. + */ + struct device_node *sdma_parent_np __free(device_node) =3D of_get_parent= (np); + + spba_bus =3D of_get_compatible_child(sdma_parent_np, "fsl,spba-bus"); + if (!spba_bus) + spba_bus =3D of_find_compatible_node(NULL, NULL, "fsl,spba-bus"); ret =3D of_address_to_resource(spba_bus, 0, &spba_res); if (!ret) { sdma->spba_start_addr =3D spba_res.start; --=20 2.34.1