diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2013-07-15 14:04:39 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-08-05 06:02:26 +0200 |
| commit | 3783cef876e0f24e93a11f1a76cc0b3fe7ea8d94 (patch) | |
| tree | 372cc51611c816f4b5265fbb7674492183397d65 /drivers/dma | |
| parent | dma: dw: improve comparison with ~0 (diff) | |
| download | linux-3783cef876e0f24e93a11f1a76cc0b3fe7ea8d94.tar.xz linux-3783cef876e0f24e93a11f1a76cc0b3fe7ea8d94.zip | |
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')
| -rw-r--r-- | drivers/dma/dw/core.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index 1ed9a9c9194a..6932645ca1f8 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; |