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Mon, 25 May 2026 05:50:59 -0500 Received: from satlexmb08.amd.com (10.181.42.217) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 25 May 2026 05:50:57 -0500 Received: from xhdappanad40.xilinx.com (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Mon, 25 May 2026 05:50:53 -0500 From: Golla Nagendra To: , , , , , , , , , , , , , CC: , , , , Subject: [PATCH 2/2] dmaengine: zynqmp_dma: Add per-channel reset support Date: Mon, 25 May 2026 16:20:42 +0530 Message-ID: <20260525105042.2249542-3-nagendra.golla@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260525105042.2249542-1-nagendra.golla@amd.com> References: <20260525105042.2249542-1-nagendra.golla@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Received-SPF: None (SATLEXMB04.amd.com: nagendra.golla@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AEB:EE_|MN0PR12MB6029:EE_ X-MS-Office365-Filtering-Correlation-Id: 5c77e8fb-7578-4e59-e570-08deba4b8232 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|7416014|376014|1800799024|82310400026|18002099003|22082099003|56012099003|921020|11063799006|6133799003; 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Add reset handling in the channel probe path using device_reset_optional() to trigger a reset pulse on the channel during initialization. Platforms without per-channel reset continue to work unaffected since device_reset_optional() returns 0 when no reset is specified. Signed-off-by: Golla Nagendra --- drivers/dma/xilinx/zynqmp_dma.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c index f6a812e49ddc..51c831760372 100644 --- a/drivers/dma/xilinx/zynqmp_dma.c +++ b/drivers/dma/xilinx/zynqmp_dma.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "../dmaengine.h" @@ -916,6 +917,11 @@ static int zynqmp_dma_chan_probe(struct zynqmp_dma_device *zdev, if (IS_ERR(chan->regs)) return PTR_ERR(chan->regs); + err = device_reset_optional(&pdev->dev); + if (err) + return dev_err_probe(&pdev->dev, err, + "failed to reset channel\n"); + chan->bus_width = ZYNQMP_DMA_BUS_WIDTH_64; chan->dst_burst_len = ZYNQMP_DMA_MAX_DST_BURST_LEN; chan->src_burst_len = ZYNQMP_DMA_MAX_SRC_BURST_LEN; -- 2.43.0