When requested 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 | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index c6a711d..cbe087e 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -374,6 +374,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic( struct omap_desc *d; dma_addr_t dev_addr; unsigned es, sync_type; + unsigned long tx_flags = 0; u32 burst;
if (dir == DMA_DEV_TO_MEM) { @@ -429,7 +430,11 @@ 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 (!no_wakeup) { + omap_enable_dma_irq(c->dma_ch, OMAP_DMA_FRAME_IRQ); + tx_flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; + } omap_disable_dma_irq(c->dma_ch, OMAP_DMA_BLOCK_IRQ); }
@@ -438,7 +443,7 @@ 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, tx_flags); }
static int omap_dma_slave_config(struct omap_chan *c, struct dma_slave_config *cfg)