forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

dmaengine: dw: return immediately from IRQ when DMA isn't in use

Browse source 
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>
This commit is contained in:
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
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) 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;
/* /*