diff mbox

[v3,05/15] dmaengine: omap-dma: Add support to suppress interrupts in cyclic mode

Message ID 1347624358-25582-6-git-send-email-peter.ujfalusi@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Peter Ujfalusi Sept. 14, 2012, 12:05 p.m. UTC 
When requested (DMA_PREP_INTERRUPT is cleared in flags) disable all DMA
interrupts for the channel. In this mode user space does not expect
periodic reports from kernel about the progress of the audio stream.
PulseAudio for example support this type of mode.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/dma/omap-dma.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Comments

Vinod Koul Sept. 17, 2012, 10 a.m. UTC | #1 
On Fri, 2012-09-14 at 15:05 +0300, Peter Ujfalusi wrote:
> When requested (DMA_PREP_INTERRUPT is cleared in flags) disable all
> DMA
> interrupts for the channel. In this mode user space does not expect
> periodic reports from kernel about the progress of the audio stream.
> PulseAudio for example support this type of mode.
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
diff mbox

Patch

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 4d2650f..f59f244 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -429,7 +429,10 @@  static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 	if (!c->cyclic) {
 		c->cyclic = true;
 		omap_dma_link_lch(c->dma_ch, c->dma_ch);
-		omap_enable_dma_irq(c->dma_ch, OMAP_DMA_FRAME_IRQ);
+
+		if (flags & DMA_PREP_INTERRUPT)
+			omap_enable_dma_irq(c->dma_ch, OMAP_DMA_FRAME_IRQ);
+
 		omap_disable_dma_irq(c->dma_ch, OMAP_DMA_BLOCK_IRQ);
 	}
 
@@ -438,7 +441,7 @@  static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 		omap_set_dma_dest_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16);
 	}
 
-	return vchan_tx_prep(&c->vc, &d->vd, DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
+	return vchan_tx_prep(&c->vc, &d->vd, flags);
 }
 
 static int omap_dma_slave_config(struct omap_chan *c, struct dma_slave_config *cfg)