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Wed, 28 Feb 2024 22:52:49 -0800 From: Akhil R To: , , , , , , , CC: Akhil R Subject: [PATCH] dmaengine: tegra186: Fix residual calculation Date: Thu, 29 Feb 2024 12:22:23 +0530 Message-ID: <20240229065223.7295-1-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.43.2 Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000044A1:EE_|LV8PR12MB9109:EE_ X-MS-Office365-Filtering-Correlation-Id: 68fd5541-61d7-45d2-556d-08dc38f31382 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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:(13230031)(36860700004)(82310400014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Feb 2024 06:53:03.3097 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 68fd5541-61d7-45d2-556d-08dc38f31382 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: BN2PEPF000044A1.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9109 The exisiting residual calculation returns an incorrect value when bytes_xfer == bytes_req. This scenario occurs particularly with drivers like UART where DMA is scheduled for maximum number of bytes and is terminated when the bytes inflow stops. At higher baud rates, it could request the tx_status while there is no bytes left to transfer. This will lead to incorrect residual being set. Hence return residual as '0' when bytes transferred equals to the bytes requested. Fixes: ee17028009d4 ("dmaengine: tegra: Add tegra gpcdma driver") Signed-off-by: Akhil R --- drivers/dma/tegra186-gpc-dma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c index 88547a23825b..3642508e88bb 100644 --- a/drivers/dma/tegra186-gpc-dma.c +++ b/drivers/dma/tegra186-gpc-dma.c @@ -746,6 +746,9 @@ static int tegra_dma_get_residual(struct tegra_dma_channel *tdc) bytes_xfer = dma_desc->bytes_xfer + sg_req[dma_desc->sg_idx].len - (wcount * 4); + if (dma_desc->bytes_req == bytes_xfer) + return 0; + residual = dma_desc->bytes_req - (bytes_xfer % dma_desc->bytes_req); return residual; -- 2.43.2