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Commit 02a21b79 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Rafael J. Wysocki
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dmaengine: dw: return immediately from IRQ when DMA isn't in use 



There is no need to bother the hardware when all channels are idle. We have not
to get any interrupts.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 32146588

drivers/dma/dw/core.c

+7 −2
Original line number Original line Diff line number Diff line
@@ -622,12 +622,17 @@ static void dw_dma_tasklet(unsigned long data) 
static irqreturn_t dw_dma_interrupt(int irq, void *dev_id)

static irqreturn_t dw_dma_interrupt(int irq, void *dev_id)

{

{

	struct dw_dma *dw = dev_id;

	struct dw_dma *dw = dev_id;

	u32 status = dma_readl(dw, STATUS_INT);

	u32 status;





	/* Check if we have any interrupt from the DMAC which is not in use */

	if (!dw->in_use)

		return IRQ_NONE;



	status = dma_readl(dw, STATUS_INT);

	dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__, status);

	dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__, status);





	/* Check if we have any interrupt from the DMAC */

	/* Check if we have any interrupt from the DMAC */

	if (!status || !dw->in_use)

	if (!status)

		return IRQ_NONE;

		return IRQ_NONE;





	/*

	/*