[PATCH 01/11] dmaengine: omap: Support for element mode in cyclic DMA
From: Peter Ujfalusi <hidden>
Date: 2012-09-12 11:46:49
Also in:
alsa-devel, linux-omap, lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
When src_maxburst/dst_maxburst is set to 0 by the users of cyclic DMA (mostly audio) indicates that we should configure the omap DMA to element sync mode instead of packet mode. Signed-off-by: Peter Ujfalusi <redacted> --- drivers/dma/omap-dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index ae05618..b77a40d 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c@@ -413,7 +413,10 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic( d->dev_addr = dev_addr; d->fi = burst; d->es = es; - d->sync_mode = OMAP_DMA_SYNC_PACKET; + if (burst) + d->sync_mode = OMAP_DMA_SYNC_PACKET; + else + d->sync_mode = OMAP_DMA_SYNC_ELEMENT; d->sync_type = sync_type; d->periph_port = OMAP_DMA_PORT_MPUI; d->sg[0].addr = buf_addr;
--
1.7.12