linux-kernel - [PATCH 3/8] dmaengine: dw-edma: Use new .device_prep_slave_sg

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Message-Id: <20251208-dma_prep_config-v1-3-53490c5e1e2a@nxp.com>
Date: Mon, 08 Dec 2025 12:09:42 -0500
From: Frank Li <Frank.Li@....com>
To: Vinod Koul <vkoul@...nel.org>, Manivannan Sadhasivam <mani@...nel.org>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Christoph Hellwig <hch@....de>, 
 Sagi Grimberg <sagi@...mberg.me>, Chaitanya Kulkarni <kch@...dia.com>, 
 Herbert Xu <herbert@...dor.apana.org.au>, 
 "David S. Miller" <davem@...emloft.net>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, Koichiro Den <den@...inux.co.jp>, 
 Niklas Cassel <cassel@...nel.org>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org, 
 mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org, 
 linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 imx@...ts.linux.dev, Frank Li <Frank.Li@....com>
Subject: [PATCH 3/8] dmaengine: dw-edma: Use new
 .device_prep_slave_sg_config() callback

Use the new .device_prep_slave_sg_config() callback to combine
configuration and descriptor preparation.

No functional changes.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/dma/dw-edma/dw-edma-core.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 8e5f7defa6b678eefe0f312ebc59f654677c744f..58f98542f8329a3bfdc5455768e8394ae601ab5f 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -532,10 +532,13 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
 }

 static struct dma_async_tx_descriptor *
-dw_edma_device_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
-			     unsigned int len,
-			     enum dma_transfer_direction direction,
-			     unsigned long flags, void *context)
+dw_edma_device_prep_slave_sg_config(struct dma_chan *dchan,
+				    struct scatterlist *sgl,
+				    unsigned int len,
+				    enum dma_transfer_direction direction,
+				    unsigned long flags,
+				    struct dma_slave_config *config,
+				    void *context)
 {
 	struct dw_edma_transfer xfer;

@@ -546,6 +549,9 @@ dw_edma_device_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 	xfer.flags = flags;
 	xfer.type = EDMA_XFER_SCATTER_GATHER;

+	if (config)
+		dw_edma_device_config(dchan, config);
+
 	return dw_edma_device_transfer(&xfer);
 }

@@ -815,7 +821,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
 	dma->device_terminate_all = dw_edma_device_terminate_all;
 	dma->device_issue_pending = dw_edma_device_issue_pending;
 	dma->device_tx_status = dw_edma_device_tx_status;
-	dma->device_prep_slave_sg = dw_edma_device_prep_slave_sg;
+	dma->device_prep_slave_sg_config = dw_edma_device_prep_slave_sg_config;
 	dma->device_prep_dma_cyclic = dw_edma_device_prep_dma_cyclic;
 	dma->device_prep_interleaved_dma = dw_edma_device_prep_interleaved_dma;

-- 
2.34.1