Commit 02a21b79 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Rafael J. Wysocki

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
...@@ -622,12 +622,17 @@ static void dw_dma_tasklet(unsigned long data) ...@@ -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;
/* /*
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment