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dmaengine: omap-dma: Add support to suppress interrupts in cyclic mode

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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>
This commit is contained in:
Peter Ujfalusi 2012-09-14 15:05:48 +03:00 committed by Mark Brown
parent ec8b5e48c0
commit 2dde5b909e
1 changed files with 5 additions and 2 deletions
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7
drivers/dma/omap-dma.c
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@ -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)