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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>
This commit is contained in:
Andy Shevchenko 2013-07-15 15:04:39 +03:00 committed by Vinod Koul
parent 78f3c9d2e0
commit 3783cef876
1 changed files with 8 additions and 5 deletions
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13
drivers/dma/dw/core.c
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@ -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;