usb: dwc3: move generic dwc3 code from gadget into core

A few inits like the scale value or the removal of the DISSCRAMBLE is
done in the gadget code however it touches a general register.
Move this piece to the core.c file since it is likely to be requied by
both, parts of the core (device and host).

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -349,6 +349,29 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
 
 	dwc3_cache_hwparams(dwc);
 
+	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
+	reg &= ~DWC3_GCTL_SCALEDOWN(3);
+	reg &= ~DWC3_GCTL_DISSCRAMBLE;
+
+	switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams0)) {
+	case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
+		reg &= ~DWC3_GCTL_DSBLCLKGTNG;
+		break;
+	default:
+		dev_dbg(dwc->dev, "No power optimization available\n");
+	}
+
+	/*
+	 * WORKAROUND: DWC3 revisions <1.90a have a bug
+	 * when The device fails to connect at SuperSpeed
+	 * and falls back to high-speed mode which causes
+	 * the device to enter in a Connect/Disconnect loop
+	 */
+	if (dwc->revision < DWC3_REVISION_190A)
+		reg |= DWC3_GCTL_U2RSTECN;
+
+	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
+
 	ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
 	if (ret) {
 		dev_err(dwc->dev, "failed to allocate event buffers\n");

drivers/usb/dwc3/gadget.c

@@ -1155,30 +1155,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 	dwc->gadget_driver	= driver;
 	dwc->gadget.dev.driver	= &driver->driver;
 
-	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
-
-	reg &= ~DWC3_GCTL_SCALEDOWN(3);
-	reg &= ~DWC3_GCTL_DISSCRAMBLE;
-
-	switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams0)) {
-	case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
-		reg &= ~DWC3_GCTL_DSBLCLKGTNG;
-		break;
-	default:
-		dev_dbg(dwc->dev, "No power optimization available\n");
-	}
-
-	/*
-	 * WORKAROUND: DWC3 revisions <1.90a have a bug
-	 * when The device fails to connect at SuperSpeed
-	 * and falls back to high-speed mode which causes
-	 * the device to enter in a Connect/Disconnect loop
-	 */
-	if (dwc->revision < DWC3_REVISION_190A)
-		reg |= DWC3_GCTL_U2RSTECN;
-
-	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
-
 	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 	reg &= ~(DWC3_DCFG_SPEED_MASK);
 	reg |= dwc->maximum_speed;