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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2015-12-04 23:49:24 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-01-07 14:11:54 +0100
commit02a21b79acdb48b312f1351fd7cc728e66e81149 (patch)
tree3af9afe12232ea84f6fe7903854779c223243791 /drivers/dma
parent3214658855c01a0dd62f02feb2ce79846524c6a0 (diff)
downloadlinux-02a21b79acdb48b312f1351fd7cc728e66e81149.tar.bz2
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: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dw/core.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 7067b6ddc1db..8b20930ade98 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -622,12 +622,17 @@ static void dw_dma_tasklet(unsigned long data)
static irqreturn_t dw_dma_interrupt(int irq, void *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);
/* Check if we have any interrupt from the DMAC */
- if (!status || !dw->in_use)
+ if (!status)
return IRQ_NONE;
/*