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[v6,1/3] dmaengine: sun6i: Set default maxburst size and bus width

Message ID 4c37c2c717077f2ebf201e141acdc8ad76d341a7.1461856751.git.moinejf@free.fr (mailing list archive)
State New, archived
Headers show

Commit Message

Jean-Francois Moine April 28, 2016, 3:07 p.m. UTC 
Some DMA clients, as audio, don't set the maxburst size and bus width
on the memory side when starting DMA transfers.
This patch prevents such transfers to be aborted by providing system
default values to the lacking ones.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
---
 drivers/dma/sun6i-dma.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index b08245e..cd436c6 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -470,10 +470,30 @@  static int set_config(struct sun6i_dma_dev *sdev,
 {
 	s8 src_width, dst_width, src_burst, dst_burst;
 
-	src_burst = convert_burst(sconfig->src_maxburst);
-	src_width = convert_buswidth(sconfig->src_addr_width);
-	dst_burst = convert_burst(sconfig->dst_maxburst);
-	dst_width = convert_buswidth(sconfig->dst_addr_width);
+	switch (direction) {
+	case DMA_MEM_TO_DEV:
+		src_burst = convert_burst(sconfig->src_maxburst ?
+					sconfig->src_maxburst : 8);
+		src_width = convert_buswidth(sconfig->src_addr_width !=
+						DMA_SLAVE_BUSWIDTH_UNDEFINED ?
+				sconfig->src_addr_width :
+				DMA_SLAVE_BUSWIDTH_4_BYTES);
+		dst_burst = convert_burst(sconfig->dst_maxburst);
+		dst_width = convert_buswidth(sconfig->dst_addr_width);
+		break;
+	case DMA_DEV_TO_MEM:
+		src_burst = convert_burst(sconfig->src_maxburst);
+		src_width = convert_buswidth(sconfig->src_addr_width);
+		dst_burst = convert_burst(sconfig->dst_maxburst ?
+					sconfig->dst_maxburst : 8);
+		dst_width = convert_buswidth(sconfig->dst_addr_width !=
+						DMA_SLAVE_BUSWIDTH_UNDEFINED ?
+				sconfig->dst_addr_width :
+				DMA_SLAVE_BUSWIDTH_4_BYTES);
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	if (src_burst < 0)
 		return src_burst;