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Mon, 18 Aug 2025 02:24:33 -0700 From: Kartik Rajput To: , , , , , , , , , , , , CC: Subject: [PATCH v4 2/5] i2c: tegra: Do not configure DMA if not supported Date: Mon, 18 Aug 2025 14:54:08 +0530 Message-ID: <20250818092412.444755-3-kkartik@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250818092412.444755-1-kkartik@nvidia.com> References: <20250818092412.444755-1-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: CO1PEPF000042A8:EE_|LV2PR12MB5750:EE_ X-MS-Office365-Filtering-Correlation-Id: 3f6f57f8-8c90-4110-b06c-08ddde39183e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700013|7416014|376014|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?P9KkyREDTdYHqaF6qHWuOEihdbrkcN1OJ6K/IxuyA3z7pz8eFeJ5+1O3W8hl?= =?us-ascii?Q?vAxjj6bY3Qzjh7BWrniTmpe2K3IgE0cnbn1nhmItqWGt5a+boCIOE8RylrpI?= =?us-ascii?Q?rJJfwVj4MaFhaG+WA0cws3fxS833ID3B6eWUyBmT75krCcE8mBeQYInrRPYc?= =?us-ascii?Q?vKsEUx6mfbhdXfgD6caDpMLKaSjLOGBW5ikAV6iNWbsex6MRiJ/Ec2Mai07S?= =?us-ascii?Q?JqR7vA44cIKcemBKzC+24E9l0yLlV7HzYyeq8WHGq+x8Vg1puz/YmXelgyvZ?= =?us-ascii?Q?mO+s7IjCiE46ebNW0Ti4ihovYZvRQuzeOensdCFNdrtejTK041+XBBIBry2H?= =?us-ascii?Q?GMjpO5V+8U8Yym8C98fGWNBQsWKS/Tt7GCcCMbJMSCy8o79RnWpZZAdK8hE7?= =?us-ascii?Q?qm/sPOpb7ok27MEK8A/KVJN6gCK/ddejbhrIbx94zJmIaeP0F2UboCOnB9yr?= =?us-ascii?Q?QaxAYxDd4RxtFT57XIKC6aQ8kKiKr+fjMVnreyCQlc6LptDdAaZCMjHSUbjX?= =?us-ascii?Q?e1GKOwDVoB/Wq9kf0ahxZf5oAKaBDNU1VijXFUhqWbhkxwcGiw34jvdWUCG5?= =?us-ascii?Q?CUQqhXXiMrepcAWXM1U6dQxg1LFX45i+VfcZdAa8DgNNeLgJEWuSziBqzAOb?= =?us-ascii?Q?GkwwhVFFC01a3mCndq1b54s8w12XKRvDQgkHCKxLcvofkTouqpK6+XAJTL41?= =?us-ascii?Q?hLGN2Yl2q7P/cO2nfmgxZkAuTJVb7lEwdRjXrspEx7dLPDEln+GiNa7G2MNp?= =?us-ascii?Q?icDcNJlobXlcXbudC4jQDF9bcE9yU/MXivW25wEaQXvWz6Plbui4NodvN/S6?= =?us-ascii?Q?YMKS6JTDeEDkfbkd5M4HikZ7Ab87rHBHDLegOZ8KzdXhPJu3HNZCfOhf1APb?= =?us-ascii?Q?i7M2ChhII9vZKZPsskkhsBCbEfsmZ64RNw12m8NxyBTrRqPsU6ptRfkM6gUs?= =?us-ascii?Q?0Qe63bT2hshJ38HbTGMKPrw1RYvttNFQgla/zbEhpWlqBTAikSrsxgDHx+6V?= =?us-ascii?Q?Lr43gC9pjV4AtdDa+w9ZwDvB89PJEKqpdt8CeirEbm9FhHdsdpl6f1bPg7W+?= =?us-ascii?Q?gjPTlSHm2VxtGYCSiFQg3W2jCFXoIOiCMdqsrYbJfrYEQovZnpiEQbaQ0VOi?= =?us-ascii?Q?gxmYEef+4oBkH2HWAUqptLfHJ2266shKEoB09ynCF/UFKnUwqUv8bhUXT1Qf?= =?us-ascii?Q?wO+NyaE15bK8ibd30Zb09r71F5z+4MGyx9duXhlScIL2gW2TlnDq5dg7eOct?= =?us-ascii?Q?hOymiRl5NEjaQqbqKF1hh9A21Hnfp7B0o+4o1owbDJQY0dSyEftB7MvzrR4H?= =?us-ascii?Q?V8GLtgxweQEx1rij3sFKtVKEHp7zyj+TdTdOBFd41EcJGNbAU0fRA/9SHa9H?= =?us-ascii?Q?weFWvTmVHjX2P24JPNqZZbV2Wsghs4n4wA24iHwbX7A116jyvbOZtX83zQAz?= =?us-ascii?Q?y9BGliIKBhwzgCKGdlKIo1tnBKzBzaCiWcp84Zln8tl3nNDWIYeDL/UP0Uju?= =?us-ascii?Q?Kct+3+oHdvMwiadcucBQNcYARUy2TkgSbelOZ3GNGeEIx7uNRzJMIcLPrA?= =?us-ascii?Q?=3D=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)(82310400026)(1800799024)(36860700013)(7416014)(376014)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Aug 2025 09:24:55.6650 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3f6f57f8-8c90-4110-b06c-08ddde39183e 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: CO1PEPF000042A8.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5750 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 4eb31b913c1a..0c428cba4df3 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