[PATCH] dmaengine: omap-dma: Allow DMA controller to prefetch data

[Mark A. Greer]

From: "Mark A. Greer" <mgreer at animalcreek.com>

Enable DMA prefetching for non-cyclic DMAs by setting the
'OMAP_DMA_DST_SYNC_PREFETCH' flag when there is a destination
synchronized DMA transfer.  Prefetching is not allowed on
source synchronized DMA transfers.  It is not allowed on
cyclic DMAs either since that can cause issues with some
users (e.g., suspending/resuming audio).

CC: Russell King <rmk+kernel at arm.linux.org.uk>
CC: Péter Ujfalusi <peter.ujfalusi at ti.com>
Signed-off-by: Mark A. Greer <mgreer at animalcreek.com>
---
 drivers/dma/omap-dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index bb2d8e7..3932eab 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -310,7 +310,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 		dev_addr = c->cfg.dst_addr;
 		dev_width = c->cfg.dst_addr_width;
 		burst = c->cfg.dst_maxburst;
-		sync_type = OMAP_DMA_DST_SYNC;
+		sync_type = OMAP_DMA_DST_SYNC_PREFETCH;
 	} else {
 		dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
 		return NULL;
-- 
1.7.12