dmaengine: omap-dma: Add support to suppress interrupts in cyclic mode (2dde5b90) · Commits · 戴 / test

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>

drivers/dma/omap-dma.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -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);

		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)

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