Revert "usb: dwc3: dwc3-omap: Disable/Enable only wrapper interrupts in prepare/complete"

This reverts commit 02dae36aa6.

That commit is bogus in two ways:

1) There's no way dwc3-omap's ->suspend() can cause any effect
	on xhci's ->suspend(). Linux device driver model guarantees
	that a parent's ->suspend() will only be called after all
	children are suspended. dwc3-omap is the parent of the
	parent of xhci.

2) When implementing Deep Sleep states where context is lost,
	USBOTGSS_IRQ0 register, well, looses context so we
	_must_ rewrite it otherwise core IRQs will never be
	reenabled and USB will appear to be dead.

Fixes: 02dae36 (usb: dwc3: dwc3-omap: Disable/Enable only
	wrapper interrupts in prepare/complete)
Cc: <stable@vger.kernel.org> # v3.17
Cc: George Cherian <george.cherian@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/dwc3-omap.c

@@ -597,7 +597,7 @@ static int dwc3_omap_prepare(struct device *dev)
 {
 	struct dwc3_omap	*omap = dev_get_drvdata(dev);
 
-	dwc3_omap_write_irqmisc_set(omap, 0x00);
+	dwc3_omap_disable_irqs(omap);
 
 	return 0;
 }
@@ -605,19 +605,8 @@ static int dwc3_omap_prepare(struct device *dev)
 static void dwc3_omap_complete(struct device *dev)
 {
 	struct dwc3_omap	*omap = dev_get_drvdata(dev);
-	u32			reg;
 
-	reg = (USBOTGSS_IRQMISC_OEVT |
-			USBOTGSS_IRQMISC_DRVVBUS_RISE |
-			USBOTGSS_IRQMISC_CHRGVBUS_RISE |
-			USBOTGSS_IRQMISC_DISCHRGVBUS_RISE |
-			USBOTGSS_IRQMISC_IDPULLUP_RISE |
-			USBOTGSS_IRQMISC_DRVVBUS_FALL |
-			USBOTGSS_IRQMISC_CHRGVBUS_FALL |
-			USBOTGSS_IRQMISC_DISCHRGVBUS_FALL |
-			USBOTGSS_IRQMISC_IDPULLUP_FALL);
-
-	dwc3_omap_write_irqmisc_set(omap, reg);
+	dwc3_omap_enable_irqs(omap);
 }
 
 static int dwc3_omap_suspend(struct device *dev)