redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
hifive-unleashed-5.1
Andy Shevchenko 2015-12-04 23:49:24 +02:00 committed by Rafael J. Wysocki
parent 3214658855
commit 02a21b79ac
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/dma/dw/core.c
View File

@ -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;
/*