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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2013-07-15 15:04:39 +0300
committerVinod Koul <vinod.koul@intel.com>2013-08-05 09:32:26 +0530
commit3783cef876e0f24e93a11f1a76cc0b3fe7ea8d94 (patch)
tree372cc51611c816f4b5265fbb7674492183397d65 /drivers/dma/dw
parent78f3c9d2e0e8c695c7379ed1ed53ea8eaf1da8e6 (diff)
downloadop-kernel-dev-3783cef876e0f24e93a11f1a76cc0b3fe7ea8d94.zip
op-kernel-dev-3783cef876e0f24e93a11f1a76cc0b3fe7ea8d94.tar.gz
dma: dw: allow shared interrupts
In the PC world is quite possible that devices are sharing the same interrupt line. The patch prepares dw_dmac driver to such cases. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/dw')
-rw-r--r--drivers/dma/dw/core.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 1ed9a9c..6932645 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -650,10 +650,13 @@ 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;
+ u32 status = dma_readl(dw, STATUS_INT);
- dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__,
- 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)
+ return IRQ_NONE;
/*
* Just disable the interrupts. We'll turn them back on in the
@@ -1566,8 +1569,8 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
/* Disable BLOCK interrupts as well */
channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);
- err = devm_request_irq(chip->dev, chip->irq, dw_dma_interrupt, 0,
- "dw_dmac", dw);
+ err = devm_request_irq(chip->dev, chip->irq, dw_dma_interrupt,
+ IRQF_SHARED, "dw_dmac", dw);
if (err)
return err;
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