[PATCH v7 1/5] usb: dwc3: omap: use request_threaded_irq()

[Roger Quadros]

We intend to share this interrupt with the OTG driver an to ensure
that irqflags match for the shared interrupt handlers we use
request_threaded_irq()

If we don't use request_treaded_irq() then forced threaded irq will
set IRQF_ONESHOT and this won't match with the OTG IRQ handler's
IRQ flags.

NOTE: OTG IRQ handler is yet to be added. This is a preparatory step.

Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
 drivers/usb/dwc3/dwc3-omap.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index 59ea35f..6504e94 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -272,16 +272,22 @@ static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
 {
 	struct dwc3_omap	*omap = _omap;
 	u32			reg;
+	int			ret = IRQ_NONE;
 
 	reg = dwc3_omap_read_irqmisc_status(omap);
 
+	if (reg)
+		ret = IRQ_HANDLED;
+
 	dwc3_omap_write_irqmisc_status(omap, reg);
 
 	reg = dwc3_omap_read_irq0_status(omap);
+	if (reg)
+		ret = IRQ_HANDLED;
 
 	dwc3_omap_write_irq0_status(omap, reg);
 
-	return IRQ_HANDLED;
+	return ret;
 }
 
 static void dwc3_omap_enable_irqs(struct dwc3_omap *omap)
@@ -497,8 +503,8 @@ static int dwc3_omap_probe(struct platform_device *pdev)
 	/* check the DMA Status */
 	reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
 
-	ret = devm_request_irq(dev, omap->irq, dwc3_omap_interrupt, 0,
-			"dwc3-omap", omap);
+	ret = devm_request_threaded_irq(dev, omap->irq, dwc3_omap_interrupt,
+					NULL, 0, "dwc3-omap", omap);
 	if (ret) {
 		dev_err(dev, "failed to request IRQ #%d --> %d\n",
 				omap->irq, ret);
-- 
2.7.4