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Tue, 18 Nov 2025 06:06:37 -0800 From: Akhil R To: , , , , , , , , CC: , , , Subject: [PATCH v13 1/6] i2c: tegra: Do not configure DMA if not supported Date: Tue, 18 Nov 2025 19:36:15 +0530 Message-ID: <20251118140620.549-2-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251118140620.549-1-akhilrajeev@nvidia.com> References: <20251118140620.549-1-akhilrajeev@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE32:EE_|MW6PR12MB8958:EE_ X-MS-Office365-Filtering-Correlation-Id: e36b7b86-1524-4830-b527-08de26abbf5a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?drJE4VD3fWQBy57Iow9NuQ2lxTd0dacz0AstozyXVHBV9sM/XJqhlGszkQuz?= =?us-ascii?Q?6oEPZVxf4wjTykqU/grCPS8NNLUGq5baGIIFDPkGiNgYZRnmXq7DBF9Ruoix?= =?us-ascii?Q?bqkZMl4t0z/+gnmLISEeAf9ri5yRbFZeYQLj5+K7Mw9SOBADlC+aHUxlbE2W?= =?us-ascii?Q?LNJyof6pANcDORk0Qp+MCjoIcAUVzdMhZDqsRcSh3c58gp8DrIrGoXdp0v4u?= =?us-ascii?Q?YeGH13zG8DIzR2aTqvuxcDk61YPwtrUo1sKleI7uhmSIT9l4PI9BS2I5zuc9?= =?us-ascii?Q?UWOthGyqbZobk+sVEKeunbk/heNFYAgsz/ywmbkIxh9NCGQT3TWcIa1LbISq?= =?us-ascii?Q?5ze6/vnWt/vIvXmcRkrEieSvaiIlmZSYhpgN29Yp1rh5k9QjzP45pFV83U3r?= =?us-ascii?Q?bSQ8ZlWmXcVbrpnWZ38eXz5wl9yR3f0QaGde+ognMFEOMjCeUjgNQsEuXLhm?= =?us-ascii?Q?Csa/TEJVEoez0Esqbu/o32b2ITojBg+j0BR/0Ud/bKZ42ojU0v0kywNRhZdI?= =?us-ascii?Q?3o17Sbfs4qMkstNS6PDOtTJOwyrztI09pwTQuY8UnmBgj7I8dMugsmuNwkkq?= =?us-ascii?Q?q7zKoH8NSnT2+pyI6RIsPcVvoLuVJMVsC+VTruGQ3BylsPKaFBERL4Fw7jnV?= =?us-ascii?Q?dcugEPZktCwwfiEZsIsEYLoq7NOopaHaM3FulOCy+YFUMCHsEBQtEmry7U4j?= =?us-ascii?Q?gN2usqw0BgCB+QBb6gXkNwKYoQbe6PCFnQJ3r30187gy6xHGy6WxRz+zV65/?= =?us-ascii?Q?pbilg9EBCOGJhofn4R0ERw22NKhzYX6qhxa24PKxHLXnCwDsceLrtwkMJcn4?= =?us-ascii?Q?vuIIaKnJBJJY3ogRkjJgS2gRxhR1sAG6KXn/LRa7ycdfTc4CQj+1M3R/IwMi?= =?us-ascii?Q?i+N/CG060zNReVqUVuhSwP9ceecBlLtxXSwe/5IH6NNPKh8wbX63Mvhi28nX?= =?us-ascii?Q?Ubpx8KDkokLoXV2HmHH0yM2MBzoCMoFyarRzWRsFEZLjkIPw+aH+82+nClJr?= =?us-ascii?Q?4H4G5IOnA6Xfhm5HubUJ1rvdCS7dOmbRgdmmZtnNyDDGXhm8V7yadBqWJyXv?= =?us-ascii?Q?8O0uV000BWSIQTnEQQEk7mEa//e9T5DOetrGegN0M6IF+lAfkn4sT6MeNSxm?= =?us-ascii?Q?RqYYQEN4By0KxHV0rKgbCQEnXp4TMs+LKeRUp6ByouW0ohChQBElwldICajR?= =?us-ascii?Q?//E5r9nro7L+j7uOHkd2IPpntTBjDRwEKlGKzKSe8/fmRI4orMNneKTp+su0?= =?us-ascii?Q?ykeAVmv9jBKjFrrxtKa169aVCTuoEKr0/GYPbM6kg2RwSeGHG+MH+qA/Ksqd?= =?us-ascii?Q?1LCFG/v+lfPrFhNddvmn51V/43j2iljxGvxonnxwzqjH7qllM3j4+RJHQ9mR?= =?us-ascii?Q?Cd6pjCWfrsaoWZOwSQWiWDv7McKzc9DJJq5yAFhZfj/xmTrvegKg0PBrrXlb?= =?us-ascii?Q?4ysYQF4MpqDIpzzngXO9k9id8WLZKF94ykEd1HobUPWe91w4xjCXSfVok1qJ?= =?us-ascii?Q?N7S7kX/KB65Qf1E7GAlwoe1Hte1EuR4PU5EAC7hKuaf3JgU6qNSEwwCmJ/5k?= =?us-ascii?Q?Hb0P2w3J59tTtHHYQak=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700013)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Nov 2025 14:07:02.3777 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e36b7b86-1524-4830-b527-08de26abbf5a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE32.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB8958 Content-Type: text/plain; charset="utf-8" From: Kartik Rajput 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 Reviewed-by: Jon Hunter Acked-by: Thierry Reding --- v4 -> v9: * Moved the condition down to have all dma checks together. 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..bd26b232ffb3 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -449,6 +449,11 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2= c_dev) if (IS_VI(i2c_dev)) return 0; =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 (i2c_dev->hw->has_apb_dma) { if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) { dev_dbg(i2c_dev->dev, "APB DMA support not enabled\n"); --=20 2.50.1