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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2012-09-14 15:05:48 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-09-22 11:12:46 -0400
commit2dde5b909e117cc95a5e31604f9bfd043e78ad9d (patch)
tree7a1dbb645051098a02f33e6fe1a9959f6c4d71f6 /drivers/dma
parentec8b5e48c03790a68cb875fe5064007a9cbdfdd0 (diff)
dmaengine: omap-dma: Add support to suppress interrupts in cyclic mode
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> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/omap-dma.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 4d2650f4202c..f59f244f60fc 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)