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Commit 3783cef8 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 78f3c9d2

drivers/dma/dw/core.c

+8 −5
Original line number Diff line number Diff line
@@ -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;