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@linaro.org>
Link: https://lore.kernel.org/r/77868edb7aff9d5cb12ac3af8827ef2e244441a6.1567150471.git.baolin.wang@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index baac476c86224f2615fe7e2f8010d68b6e1dfdb9..525dc7338fe3b86842f4d2aa3ffd9857d34ec5f6 100644 (file)
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -908,6 +908,7 @@ sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
        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 @@ sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                        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 @@ sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                }
        }
 
-       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;