DWC3_GUCTL3
reg = dwc3_readl(dwc, DWC3_GUCTL3);
dwc3_writel(dwc, DWC3_GUCTL3, reg);
reg = dwc3_readl(dwc, DWC3_GUCTL3);
dwc3_writel(dwc, DWC3_GUCTL3, reg);
reg = dwc3_readl(dwc, DWC3_GUCTL3);
dwc3_writel(dwc, DWC3_GUCTL3, reg);