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Subject[PATCH 4/6] dma: dw: allow shared interrupts
Date
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>
---
drivers/dma/dw/core.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index a0aa6f9..f70c6b4 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
@@ -1567,8 +1570,8 @@ 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;

--
1.8.3.2


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