USB: DWC3: Put 100 ms delay for phy to be stable

Before taking core out of reset phy must be stable. So wait for 100ms
after clear phy reset.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -148,6 +148,8 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
 	reg &= ~DWC3_GUSB2PHYCFG_PHYSOFTRST;
 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
+	mdelay(100);
+
 	/* After PHYs are stable we can take Core out of reset state */
 	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 	reg &= ~DWC3_GCTL_CORESOFTRESET;