---

yaml --- r: 172503 b: refs/heads/master c: 4998f1a h: refs/heads/master i: 172501: f97961c 172499: 02a6f6c 172495: 7ae2be2 v: v3
git-mirror · Nov 24, 2009 · 96e1e02 · 96e1e02
1 parent 06c8bc8
commit 96e1e02
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Showing 3 changed files with 11 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 74b2a70e34c69687f82b1319a358b21afeea497c
+refs/heads/master: 4998f1a30cf8e21c5bc0766fde4fa58e1adabd72
diff --git a/trunk/arch/arm/plat-mxc/dma-mx1-mx2.c b/trunk/arch/arm/plat-mxc/dma-mx1-mx2.c
@@ -156,7 +156,8 @@ static inline int imx_dma_sg_next(int channel, struct scatterlist *sg)
 	}
 
 	now = min(imxdma->resbytes, sg->length);
-	imxdma->resbytes -= now;
+	if (imxdma->resbytes != IMX_DMA_LENGTH_LOOP)
+		imxdma->resbytes -= now;
 
 	if ((imxdma->dma_mode & DMA_MODE_MASK) == DMA_MODE_READ)
 		__raw_writel(sg->dma_address, DMA_BASE + DMA_DAR(channel));

diff --git a/trunk/arch/arm/plat-mxc/include/mach/dma-mx1-mx2.h b/trunk/arch/arm/plat-mxc/include/mach/dma-mx1-mx2.h
@@ -58,6 +58,14 @@ imx_dma_setup_single(int channel, dma_addr_t dma_address,
 		unsigned int dma_length, unsigned int dev_addr,
 		unsigned int dmamode);
 
+
+/*
+ * Use this flag as the dma_length argument to imx_dma_setup_sg()
+ * to create an endless running dma loop. The end of the scatterlist
+ * must be linked to the beginning for this to work.
+ */
+#define IMX_DMA_LENGTH_LOOP	((unsigned int)-1)
+
 int
 imx_dma_setup_sg(int channel, struct scatterlist *sg,
 		unsigned int sgcount, unsigned int dma_length,