linux-kernel - [PATCH] dmaengine: zynqmp_dma: Add shutdown operation support

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Message-ID: <20250612162144.3294953-1-abin.joseph@amd.com>
Date: Thu, 12 Jun 2025 21:51:44 +0530
From: Abin Joseph <abin.joseph@....com>
To: <vkoul@...nel.org>, <michal.simek@....com>, <yanzhen@...o.com>,
	<radhey.shyam.pandey@....com>, <palmer@...osinc.com>,
	<u.kleine-koenig@...libre.com>
CC: <git@....com>, <abin.joseph@....com>, <dmaengine@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] dmaengine: zynqmp_dma: Add shutdown operation support

Implement shutdown hook to ensure dmaengine could be stopped inorder for
kexec to restart the new kernel.

Signed-off-by: Abin Joseph <abin.joseph@....com>
---
 drivers/dma/xilinx/zynqmp_dma.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
index d05fc5fcc77d..8f9f1ef4f0bf 100644
--- a/drivers/dma/xilinx/zynqmp_dma.c
+++ b/drivers/dma/xilinx/zynqmp_dma.c
@@ -1178,6 +1178,18 @@ static void zynqmp_dma_remove(struct platform_device *pdev)
 		zynqmp_dma_runtime_suspend(zdev->dev);
 }
 
+/**
+ * zynqmp_dma_shutdown - Driver shutdown function
+ * @pdev: Pointer to the platform_device structure
+ */
+static void zynqmp_dma_shutdown(struct platform_device *pdev)
+{
+	struct zynqmp_dma_device *zdev = platform_get_drvdata(pdev);
+
+	zynqmp_dma_chan_remove(zdev->chan);
+	pm_runtime_disable(zdev->dev);
+}
+
 static const struct of_device_id zynqmp_dma_of_match[] = {
 	{ .compatible = "amd,versal2-dma-1.0", .data = &versal2_dma_config },
 	{ .compatible = "xlnx,zynqmp-dma-1.0", },
@@ -1193,6 +1205,7 @@ static struct platform_driver zynqmp_dma_driver = {
 	},
 	.probe = zynqmp_dma_probe,
 	.remove = zynqmp_dma_remove,
+	.shutdown = zynqmp_dma_shutdown,
 };
 
 module_platform_driver(zynqmp_dma_driver);
-- 
2.34.1