From mboxrd@z Thu Jan 1 00:00:00 1970 From: peter.ujfalusi@ti.com (Peter Ujfalusi) Date: Fri, 14 Sep 2012 15:05:48 +0300 Subject: [PATCH v3 05/15] dmaengine: omap-dma: Add support to suppress interrupts in cyclic mode In-Reply-To: <1347624358-25582-1-git-send-email-peter.ujfalusi@ti.com> References: <1347624358-25582-1-git-send-email-peter.ujfalusi@ti.com> Message-ID: <1347624358-25582-6-git-send-email-peter.ujfalusi@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 CC: Russell King --- drivers/dma/omap-dma.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) 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) -- 1.7.12