linux-kernel - [PATCH] dmaengine: sprd: Fix the DMA link-list configuration

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Date:   Fri, 30 Aug 2019 15:37:45 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     vkoul@...nel.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com,
        dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
        dmaengine@...r.kernel.org, eric.long@...soc.com,
        baolin.wang@...aro.org
Subject: [PATCH] dmaengine: sprd: Fix the DMA link-list configuration

For the Spreadtrum DMA link-list mode, when the DMA engine got a slave
hardware request, which will trigger the DMA engine to load the DMA
configuration from the link-list memory automatically. But before the
slave hardware request, the slave will get an incorrect residue due
to the first node used to trigger the link-list was configured as the
last source address and destination address.

Thus we should make sure the first node was configured the start source
address and destination address, which can fix this issue.

Fixes: 4ac695464763 ("dmaengine: sprd: Support DMA link-list mode")
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/dma/sprd-dma.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index baac476..525dc73 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -908,6 +908,7 @@ static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
 	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
 	struct dma_slave_config *slave_cfg = &schan->slave_cfg;
 	dma_addr_t src = 0, dst = 0;
+	dma_addr_t start_src = 0, start_dst = 0;
 	struct sprd_dma_desc *sdesc;
 	struct scatterlist *sg;
 	u32 len = 0;
@@ -954,6 +955,11 @@ static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
 			dst = sg_dma_address(sg);
 		}
 
+		if (!i) {
+			start_src = src;
+			start_dst = dst;
+		}
+
 		/*
 		 * The link-list mode needs at least 2 link-list
 		 * configurations. If there is only one sg, it doesn't
@@ -970,8 +976,8 @@ static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
 		}
 	}
 
-	ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, src, dst, len,
-				 dir, flags, slave_cfg);
+	ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, start_src,
+				 start_dst, len, dir, flags, slave_cfg);
 	if (ret) {
 		kfree(sdesc);
 		return NULL;
-- 
1.7.9.5