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Mon, 23 Feb 2026 21:39:23 -0800 From: Akhil R To: CC: , , , , , , , , , , , , Subject: Re: [PATCH 3/8] dmaengine: tegra: Make reset control optional Date: Tue, 24 Feb 2026 11:09:22 +0530 Message-ID: <20260224053922.43058-1-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000252A0:EE_|PH0PR12MB7864:EE_ X-MS-Office365-Filtering-Correlation-Id: 1f3d7853-ee0a-4ecb-4ea4-08de736716b4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|376014|36860700013|13003099007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?gJ85kFT2Kpnb+lxotX6CVsa0Reh6MbcyZ4s3hmkjBzBNAVqZtsNqT6kF7R+6?= =?us-ascii?Q?r3SQxOaTpynDASRcfZQN2/MQi3aadAtLaQ58u/i6ZE42tUXEGvMWNYHBzWDM?= =?us-ascii?Q?pmeL44MwSt0/pkSQu9teTUqBqULqKyzRnBTKgHq58MqaC3YtFjl9/o3Cslbm?= =?us-ascii?Q?cRPpA0U4usvpsiMdirYoXn/yH3biXT/1V9NCSSxtMbBroQFHcMvz33v5R/v6?= =?us-ascii?Q?82G/YWfp+L+m8czrVLtjY2sFuaBTDPBbG9oKxRIr6XoO/ukOEsMKpp/GOD0g?= =?us-ascii?Q?okB5slXSqBC1RRf4q7/VPfXeGtowaSiUH7bZZBQThiKT2FCHpYZglYZ2yuDT?= =?us-ascii?Q?161m8sXmCHz3GCrzea5DisYDQJ55g2VSg4d+zEbBXCF9W9rZpXDsdM9uKgyT?= =?us-ascii?Q?vK2jUAqRO8YmzBXhRxd18sbiRkyjc+yCZ5aaUDxGkfb8YoHkmRMTdw2/moqO?= =?us-ascii?Q?7UpG3TpDRsYmTlrV6XXOPvY7xtS2fFZmj+kRC20uE1VQD66zGoIYTBbpnu5e?= =?us-ascii?Q?mDJSEwfj+4frv1KvmtYNOMGe+EVXRG6ByoYbKhO27FoNAwrPoVXGwFPor0d6?= =?us-ascii?Q?WTsxMCx0SH3378xSeqTcaXI+rZU0XWYoG9yJL8sYxqUkkwFppAULEkXfXl7J?= =?us-ascii?Q?3kJ7j9D0+Ci9Dm1CLmFaed9Sd9dFCYd2mxS5RDSNKs80QUYW9TRLuoAYgPwJ?= =?us-ascii?Q?nS1fXJW5Ychokz3LXNmRWjH+dCnH28E0T+FJvzEOCGQgZHELYpyB48CKOvdB?= =?us-ascii?Q?qNYUXYldypnLqMvTVhzKQ7g+EU01T87U+MGtwOQrkBPCQvQX1Lh0o3BPw0B5?= =?us-ascii?Q?oUkFKrcGGI/TkA/hEKA4GM5GYTVJmgJy5GjPg9UlJwBjGVgtFtsCeCuthmqX?= =?us-ascii?Q?O9vkj2CNZekOYbexva6DV4BLnWmLrCYxKCZo5VgxXmI/XxwsiBqLMjo+PDN2?= =?us-ascii?Q?aVaCD/62iTPyra4hDZkc18YeJrJ7qzswRR8h3MbTqN5kMx59+TVGIkayvgTm?= =?us-ascii?Q?tElxkp6KEMDQBncan8kp2V4IrXPYe3MQCI2W/ybBR2fXEDLhaIQFFBt6kCjJ?= =?us-ascii?Q?hT5RbdsswR+hTszFDp2HsmHiD5zCtwx+KPkbmYj3Wm1FjkUzTJd8IrPndYlG?= =?us-ascii?Q?Ax6wNKN+XnZlPEshreBkZ5urIaUBYXkvfUOMR2GMvZO66DbX7LOzt/kYhUOY?= =?us-ascii?Q?gz/lYe9xf4/VDlOu93bpRvtFde8hbTEW3ounqu1ZkQHkHsCEjzb3tRz/1N8Q?= =?us-ascii?Q?T5OmWEz2tDjMxQGfIntRyQGGYdNUDPnMXsMbO35M+CgZMb7HIrfxjxyhm+bN?= =?us-ascii?Q?WwTPksA/aS/0GF0q6ppyM4RAoWgxtNESICNZEl96fjVTRKcty4Xv27FzK5bo?= =?us-ascii?Q?Y4j61fnxZ68Bwuhlr2UAkHtqNLuPTZ3B6ah/1mednyHC5oF0NPaSS6ukphRY?= =?us-ascii?Q?tby40UK4bk3KEZdxTGtSLaZI60nX2AX/tXKpPz5S8I1X8aS/y+Z4PuB9P0OM?= =?us-ascii?Q?A9ZS/jNY1CQf7oRcAIYxBFkpUVORvmIoEmmpXjFADpmFGTXryRkHsTl4cLd5?= =?us-ascii?Q?7RBm4EUwLEvyzEuzteF9d1/E2kTz5peBthhIz7s3EOGaFbgbytuD/FZ97QV2?= =?us-ascii?Q?YnU98lCviCPMAW+8gYyD4UAIu8soIj2p0LGb5txu0eLSAvAf8uJ5oNHGczK0?= =?us-ascii?Q?I6tdMw=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(7416014)(376014)(36860700013)(13003099007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: GjkxHqpKchcTzw/ujew3RrUmuwyl+bkbOCbPRyoNU5QvSHAhrKSl27FKu8lZ5jT2XY0ouk4Z1MQtEu0GIuGKVbfScJiC7Tfx+JE7LjxL+lDMIvSk+cldIuPCCqQwVXcWlLLoVKryr1gmrv/NlkJR3F7ThW1QgzX1kCwMs19lq0Nd7MylN0Ip08agD/XyZADty5nksDfmoUclLxQ3Sizlx49jyY8WFJ4HZkAHum1dEQZFKRl3NdzNS4LY7VBvYxut/2nRc9M2Of0iMq8+MINW3qYr7QMZ8cYYpH4nBDqicumEjofUtZkJ0KQ83d8UClEfPwaRG+s25GA6xmGWQfVdAMYarRSoiIjKRS5Q6C/sHLYldqP5uaI+AlpQ+eqSi59EyjMfEYPBd6SrCUQgAHr0Eg7paQjw/jd754WDyxwfK5M1axbNODaAJvp9GbM39KIM X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2026 05:39:33.1836 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1f3d7853-ee0a-4ecb-4ea4-08de736716b4 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000252A0.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7864 Hi Frank, On Tue, 17 Feb 2026 13:04:57 -0500, Frank Li wrote: > On Tue, Feb 17, 2026 at 11:04:52PM +0530, Akhil R wrote: >> Tegra264 BPMP restricts access to GPCDMA reset control and the reset > > what's means of BPMP? BPMP is Boot and Power Management Processor which is a co-processor in Tegra and runs a dedicated firmware. It manages the boot, clock, reset etc. I will put the expansion in the commit message in the next version. Do you suggest adding more details? There is a documentation for this in Linux - https://www.kernel.org/doc/Documentation/devicetree/bindings/firmware/nvidia%2Ctegra186-bpmp.txt > > Frank >> is expected to be deasserted on boot by BPMP. Hence Make the reset >> control optional in the driver. >> >> Signed-off-by: Akhil R >> --- >> drivers/dma/tegra186-gpc-dma.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c >> index 4d6fe0efa76e..236a298c26a1 100644 >> --- a/drivers/dma/tegra186-gpc-dma.c >> +++ b/drivers/dma/tegra186-gpc-dma.c >> @@ -1382,7 +1382,7 @@ static int tegra_dma_probe(struct platform_device *pdev) >> if (IS_ERR(tdma->base_addr)) >> return PTR_ERR(tdma->base_addr); >> >> - tdma->rst = devm_reset_control_get_exclusive(&pdev->dev, "gpcdma"); >> + tdma->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, "gpcdma"); >> if (IS_ERR(tdma->rst)) { >> return dev_err_probe(&pdev->dev, PTR_ERR(tdma->rst), >> "Missing controller reset\n"); Thanks for the review. Regards, Akhil