linux-kernel - [PATCH] dmaengine: dw-edma: Set status for callback

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Message-ID: <20250710112300.439575-1-devverma@amd.com>
Date: Thu, 10 Jul 2025 16:53:00 +0530
From: Devendra K Verma <devverma@....com>
To: <devverma@....com>
CC: <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<mani@...nel.org>, <michal.simek@....com>
Subject: [PATCH] dmaengine: dw-edma: Set status for callback_result

DMA Engine has support for the callback_result which provides
the status of the request and the residue. This helps in
determining the correct status of the request and in
efficient resource management of the request.

Signed-off-by: Devendra K Verma <devverma@....com>
---
 drivers/dma/dw-edma/dw-edma-core.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index c2b88cc99e5d..9f37dc6c92c6 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -596,6 +596,25 @@ dw_edma_device_prep_interleaved_dma(struct dma_chan *dchan,
 	return dw_edma_device_transfer(&xfer);
 }
 
+static void dw_hdma_set_callback_result(struct virt_dma_desc *vd,
+					enum dmaengine_tx_result result)
+{
+	u32 residue = 0;
+	struct dw_edma_desc *desc;
+	struct dmaengine_result *res;
+
+	if (!vd->tx.callback_result)
+		return;
+
+	desc = vd2dw_edma_desc(vd);
+	if (desc)
+		residue = desc->alloc_sz - desc->xfer_sz;
+
+	res = &vd->tx_result;
+	res->result = result;
+	res->residue = residue;
+}
+
 static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
 {
 	struct dw_edma_desc *desc;
@@ -609,6 +628,8 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
 		case EDMA_REQ_NONE:
 			desc = vd2dw_edma_desc(vd);
 			if (!desc->chunks_alloc) {
+				dw_hdma_set_callback_result(vd,
+							DMA_TRANS_NOERROR);
 				list_del(&vd->node);
 				vchan_cookie_complete(vd);
 			}
@@ -645,6 +666,7 @@ static void dw_edma_abort_interrupt(struct dw_edma_chan *chan)
 	spin_lock_irqsave(&chan->vc.lock, flags);
 	vd = vchan_next_desc(&chan->vc);
 	if (vd) {
+		dw_hdma_set_callback_result(vd, DMA_TRANS_ABORTED);
 		list_del(&vd->node);
 		vchan_cookie_complete(vd);
 	}
-- 
2.43.0