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Wed, 17 Sep 2025 01:35:53 -0700 From: Kartik Rajput To: , , , , , , , , , , , , CC: Subject: [PATCH v7 1/4] i2c: tegra: Do not configure DMA if not supported Date: Wed, 17 Sep 2025 14:05:42 +0530 Message-ID: <20250917083545.594081-2-kkartik@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250917083545.594081-1-kkartik@nvidia.com> References: <20250917083545.594081-1-kkartik@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044FD:EE_|SJ5PPFE4FC9FAB3:EE_ X-MS-Office365-Filtering-Correlation-Id: a1ee1c25-ba25-49aa-ba07-08ddf5c54569 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|7416014|376014|82310400026|1800799024|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?YdLLaOFCiAGQ8Hwad2JLOCKXlCg9xeWEA3qQi6A5SabvnJewcC6nFe+QsZ//?= =?us-ascii?Q?4QIp5ozWVh/QsESjLsJbQkcu484gdLp8cJjQudN3EGpTBT9R+Y/wpd71fPW/?= =?us-ascii?Q?h24w3MYmRIfpfHeh+rrtGDit/GPAc8ZLwn4E5iJHdp7JYEQw2y9SESXfyLaX?= =?us-ascii?Q?XMuOuYG2hjLCShmG0bni4qPLd1qrN8+TUd74qNaQcbXIdNHJGaOKmFhXqnFC?= =?us-ascii?Q?j5JTYoG/bxK0Ff/nmR5xjSwJtXqjiUuLYn6E0tdn3E0hM8Xirt3VOaxWJHxZ?= =?us-ascii?Q?ESIcpp+7bkJ3P/6HYW3KskuP0Sv9KJnTHMFs/Q+FZHyUCaZBFYVCn3k3CXef?= =?us-ascii?Q?1DoIr1vZreBgxSlQDvVMX6PHIVtyC1S7xd7w7iNMnze/ja+BrlkR0En5cp8b?= =?us-ascii?Q?U2brrp8X+6JcSy5aMmwUQXDlLys/3Z6NGinNvQnMi0oGtRoiwsOkX7jv2za4?= =?us-ascii?Q?QM50YEAPvj1CNGi7V9oXw9EfJiigkPDWLBdwu/xTf3ykOC5IVMQ3/XSCjKbT?= =?us-ascii?Q?B5EOPfYAw+oeQvBrOS7ijcHK9XRa08MIdxZ8jB8P15LmvnL1n7ZNXNv3SHXW?= =?us-ascii?Q?+AgAcW1bqe+thkGUxPnsUOiEr2+R4ayZG8/xjjDHH0+CHnI33SpWTnZOu0SR?= =?us-ascii?Q?flZLWn0AkNt8elf8uOeSld2qbQ48f4RUqNgjFG7sk2NBbbzUkaDUpLaUssQM?= =?us-ascii?Q?k7W9g5vfmZGA9YlS5mxQ0eooT974ZWBencDPOK2pJ/YD0I9091yZDD/Q0pxF?= =?us-ascii?Q?5o+8brZjRkQ+WRFHL1X5FTZzhIuauC0DKjtczBov+Vp0v4HrHDf5RizxUP6T?= =?us-ascii?Q?D1BNhCPmeRt8/eQ3Uj1AzZ58zvbVM7vWlKK3LBj1NLBBCfco9ntkOTdY7Lxu?= =?us-ascii?Q?GwHYJElFNPdT/1fhsCXw/ZOvDTRDFXQ/9E76wW0FJarm2NuiMHHry8rSSA/s?= =?us-ascii?Q?NI99N+mEq9mNyF2P1Gw5kvRVfQhsNnMe3Y2d7jtpcXvHVWSfWoIQj8uz87G5?= =?us-ascii?Q?n+uOF2Cr4gTahoxQKobchm7fB7y5h9EA4Djyyb6Csh6+v/oGt8EV01m9+mzQ?= =?us-ascii?Q?XtqGcfdlFQ4bn1oph+0vkj54YGPGZG9uryfR0xJK77BO7d8isfKzERIOObKT?= =?us-ascii?Q?BHbWBGt9aX1cmB4BZVYW/iDsJ9wER/SyGh9hfqy4hwtYerW0+bPlhaLHi4jk?= =?us-ascii?Q?x/tJ7epcEMgDUWmJACXNF1lU2VTGDY2JDLO2Wm2CwpSYbdEHtTtccshW/lhu?= =?us-ascii?Q?k22dbE6p8Bnr3II599R9gz5taU9zBxqCY2MO2krp2T16AHCddEAnfBsAkpt0?= =?us-ascii?Q?anyO1ZP9KYSOuIePiP/9inZ3bFKVoPOiunyo3Sni3gQzyepGR/W2zZ4jT4hK?= =?us-ascii?Q?YKX6yHrkx2oNkizsyKJzLTdGod/rKV0X9cMj6/dog1v0EtHMI6dSdT6t/o4J?= =?us-ascii?Q?c1moumjyAbdgpHSjOU16DdzCD4I5019X9U7OsetzRehDE+/kVOvoFzZrG7H7?= =?us-ascii?Q?VIOPtq3uX7LZT/KjP4dTZvKOzxIDsUuf9hCyXyHoQPnE7kndFGipalUlcw?= =?us-ascii?Q?=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(7416014)(376014)(82310400026)(1800799024)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2025 08:36:17.6929 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a1ee1c25-ba25-49aa-ba07-08ddf5c54569 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044FD.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPFE4FC9FAB3 Content-Type: text/plain; charset="utf-8" On Tegra264, not all I2C controllers have the necessary interface to GPC DMA, this causes failures when function tegra_i2c_init_dma() is called. Ensure that "dmas" device-tree property is present before initializing DMA in function tegra_i2c_init_dma(). Signed-off-by: Kartik Rajput --- v2 -> v4: * Add debug print if DMA is not supported by the I2C controller. v1 -> v2: * Update commit message to clarify that some I2C controllers may not have the necessary interface to GPC DMA. --- drivers/i2c/busses/i2c-tegra.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index e533460bccc3..d908e5e3f0af 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -446,6 +446,11 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2= c_dev) u32 *dma_buf; int err; =20 + if (!of_property_present(i2c_dev->dev->of_node, "dmas")) { + dev_dbg(i2c_dev->dev, "DMA not available, falling back to PIO\n"); + return 0; + } + if (IS_VI(i2c_dev)) return 0; =20 --=20 2.43.0