diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 369bab1..619fa7c 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -27,6 +27,7 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/list.h>
@@ -107,6 +108,7 @@ void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
 	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 	reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
 	reg |= DWC3_GCTL_PRTCAPDIR(mode);
+	dwc->current_mode = mode;
 	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 }
 
@@ -839,6 +841,505 @@ static int dwc3_core_get_phy(struct dwc3 *dwc)
 	return 0;
 }
 
+static int dwc3_drd_start_host(struct dwc3 *dwc, int on, bool skip);
+static int dwc3_drd_start_gadget(struct dwc3 *dwc, int on);
+
+/* dwc->lock must be held */
+static void dwc3_drd_statemachine(struct dwc3 *dwc, int id, int vbus)
+{
+	enum usb_otg_state new_state;
+	int protocol;
+
+	if (id == dwc->otg_fsm.id && vbus == dwc->otg_fsm.b_sess_vld)
+		return;
+
+	dwc->otg_fsm.id = id;
+	dwc->otg_fsm.b_sess_vld = vbus;
+
+	if (!id) {
+		new_state = OTG_STATE_A_HOST;
+	} else{
+		if (vbus)
+			new_state = OTG_STATE_B_PERIPHERAL;
+		else
+			new_state = OTG_STATE_B_IDLE;
+	}
+
+	if (dwc->otg.state == new_state)
+		return;
+
+	protocol = dwc->otg_fsm.protocol;
+	switch (new_state) {
+	case OTG_STATE_B_IDLE:
+		if (protocol == PROTO_GADGET)
+			dwc3_drd_start_gadget(dwc, 0);
+		else if (protocol == PROTO_HOST)
+			dwc3_drd_start_host(dwc, 0, 0);
+		dwc->otg_fsm.protocol = PROTO_UNDEF;
+		break;
+	case OTG_STATE_B_PERIPHERAL:
+		if (protocol == PROTO_HOST)
+			dwc3_drd_start_host(dwc, 0, 0);
+
+		if (protocol != PROTO_GADGET) {
+			dwc->otg_fsm.protocol = PROTO_GADGET;
+			dwc3_drd_start_gadget(dwc, 1);
+		}
+		break;
+	case OTG_STATE_A_HOST:
+		if (protocol == PROTO_GADGET)
+			dwc3_drd_start_gadget(dwc, 0);
+
+		if (protocol != PROTO_HOST) {
+			dwc->otg_fsm.protocol = PROTO_HOST;
+			dwc3_drd_start_host(dwc, 1, 0);
+		}
+		break;
+	default:
+		dev_err(dwc->dev, "drd: invalid usb-drd state: %s\n",
+			usb_otg_state_string(new_state));
+		return;
+	}
+
+	dwc->otg.state = new_state;
+}
+
+/* dwc->lock must be held */
+static void dwc3_otg_fsm_sync(struct dwc3 *dwc)
+{
+	u32 reg;
+	int id, vbus;
+
+	/*
+	 * calling dwc3_otg_fsm_sync() during resume breaks host
+	 * if adapter was removed during suspend as xhci driver
+	 * is not prepared to see hcd removal before xhci_resume.
+	 */
+	if (dwc->otg_prevent_sync)
+		return;
+
+	reg = dwc3_readl(dwc->regs, DWC3_OSTS);
+	id = !!(reg & DWC3_OSTS_CONIDSTS);
+	vbus = !!(reg & DWC3_OSTS_BSESVLD);
+	dwc3_drd_statemachine(dwc, id, vbus);
+}
+
+static void dwc3_drd_work(struct work_struct *work)
+{
+	struct dwc3 *dwc = container_of(work, struct dwc3,
+					otg_work);
+
+	spin_lock(&dwc->lock);
+	dwc3_otg_fsm_sync(dwc);
+	spin_unlock(&dwc->lock);
+}
+
+static void dwc3_otg_disable_events(struct dwc3 *dwc, u32 disable_mask)
+{
+	dwc->oevten &= ~(disable_mask);
+	dwc3_writel(dwc->regs, DWC3_OEVTEN, dwc->oevten);
+}
+
+static void dwc3_otg_enable_events(struct dwc3 *dwc, u32 enable_mask)
+{
+	dwc->oevten |= (enable_mask);
+	dwc3_writel(dwc->regs, DWC3_OEVTEN, dwc->oevten);
+}
+
+#define DWC3_OTG_ALL_EVENTS	(DWC3_OEVTEN_XHCIRUNSTPSETEN | \
+		DWC3_OEVTEN_DEVRUNSTPSETEN | DWC3_OEVTEN_HIBENTRYEN | \
+		DWC3_OEVTEN_CONIDSTSCHNGEN | DWC3_OEVTEN_HRRCONFNOTIFEN | \
+		DWC3_OEVTEN_HRRINITNOTIFEN | DWC3_OEVTEN_ADEVIDLEEN | \
+		DWC3_OEVTEN_ADEVBHOSTENDEN | DWC3_OEVTEN_ADEVHOSTEN | \
+		DWC3_OEVTEN_ADEVHNPCHNGEN | DWC3_OEVTEN_ADEVSRPDETEN | \
+		DWC3_OEVTEN_ADEVSESSENDDETEN | DWC3_OEVTEN_BDEVHOSTENDEN | \
+		DWC3_OEVTEN_BDEVHNPCHNGEN | DWC3_OEVTEN_BDEVSESSVLDDETEN | \
+		DWC3_OEVTEN_BDEVVBUSCHNGE)
+
+static irqreturn_t dwc3_otg_thread_irq(int irq, void *_dwc)
+{
+	struct dwc3 *dwc = _dwc;
+
+	spin_lock(&dwc->lock);
+	if (dwc->otg_needs_host_start) {
+		dwc3_drd_start_host(dwc, true, 1);
+		dwc->otg_needs_host_start = 0;
+	}
+
+	dwc3_otg_fsm_sync(dwc);
+	spin_unlock(&dwc->lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dwc3_otg_irq(int irq, void *_dwc)
+{
+	u32 reg;
+	struct dwc3 *dwc = _dwc;
+	irqreturn_t ret = IRQ_NONE;
+
+	reg = dwc3_readl(dwc->regs, DWC3_OEVT);
+	if (reg) {
+		if ((dwc->otg_fsm.protocol == PROTO_HOST) &&
+		    !(reg & DWC3_OEVT_DEVICEMODE))
+			dwc->otg_needs_host_start = 1;
+		dwc3_writel(dwc->regs, DWC3_OEVT, reg);
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	return ret;
+}
+
+/* --------------------- Dual-Role management ------------------------------- */
+static void dwc3_otgregs_init(struct dwc3 *dwc)
+{
+	u32 reg;
+
+	/*
+	 * Prevent host/device reset from resetting OTG core.
+	 * If we don't do this then xhci_reset (USBCMD.HCRST) will reset
+	 * the signal outputs sent to the PHY, the OTG FSM logic of the
+	 * core and also the resets to the VBUS filters inside the core.
+	 */
+	reg = dwc3_readl(dwc->regs, DWC3_OCFG);
+	reg |= DWC3_OCFG_SFTRSTMASK;
+	dwc3_writel(dwc->regs, DWC3_OCFG, reg);
+
+	/* Disable hibernation for simplicity */
+	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
+	reg &= ~DWC3_GCTL_GBLHIBERNATIONEN;
+	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
+
+	/*
+	 * Initialize OTG registers as per
+	 * Figure 11-4 OTG Driver Overall Programming Flow
+	 */
+	/* OCFG.SRPCap = 0, OCFG.HNPCap = 0 */
+	reg = dwc3_readl(dwc->regs, DWC3_OCFG);
+	reg &= ~(DWC3_OCFG_SRPCAP | DWC3_OCFG_HNPCAP);
+	dwc3_writel(dwc->regs, DWC3_OCFG, reg);
+	/* OEVT = FFFF */
+	dwc3_writel(dwc->regs, DWC3_OEVT, ~0);
+	/* OEVTEN = 0 */
+	dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
+	/* OEVTEN.ConIDStsChngEn = 1. Instead we enable all events */
+	dwc3_otg_enable_events(dwc, DWC3_OTG_ALL_EVENTS);
+	/*
+	 * OCTL.PeriMode = 1, OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0,
+	 * OCTL.HNPReq = 0
+	 */
+	reg = dwc3_readl(dwc->regs, DWC3_OCTL);
+	reg |= DWC3_OCTL_PERIMODE;
+	reg &= ~(DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN |
+		 DWC3_OCTL_HNPREQ);
+	dwc3_writel(dwc->regs, DWC3_OCTL, reg);
+}
+
+/* dwc->lock must be held */
+static int dwc3_drd_start_host(struct dwc3 *dwc, int on, bool skip)
+{
+	u32 reg;
+
+	/* switch OTG core */
+	if (on) {
+		/* As per Figure 11-10 A-Device Flow Diagram */
+		/* OCFG.HNPCap = 0, OCFG.SRPCap = 0 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCFG);
+		reg &= ~(DWC3_OCFG_SRPCAP | DWC3_OCFG_HNPCAP);
+		dwc3_writel(dwc->regs, DWC3_OCFG, reg);
+
+		/*
+		 * OCTL.PeriMode=0, OCTL.TermSelDLPulse = 0,
+		 * OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0
+		 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCTL);
+		reg &= ~(DWC3_OCTL_PERIMODE | DWC3_OCTL_TERMSELIDPULSE |
+			 DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN);
+		dwc3_writel(dwc->regs, DWC3_OCTL, reg);
+
+		/*
+		 * OCFG.DisPrtPwrCutoff = 0/1
+		 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCFG);
+		reg &= ~DWC3_OCFG_DISPWRCUTTOFF;
+		dwc3_writel(dwc->regs, DWC3_OCFG, reg);
+
+		/* start the xHCI host driver */
+		if (!skip) {
+			spin_unlock(&dwc->lock);
+			dwc3_host_init(dwc);
+			spin_lock(&dwc->lock);
+		}
+
+		/*
+		 * OCFG.SRPCap = 1, OCFG.HNPCap = GHWPARAMS6.HNP_CAP
+		 * We don't want SRP/HNP for simple dual-role so leave
+		 * these disabled.
+		 */
+
+		/*
+		 * OEVTEN.OTGADevHostEvntEn = 1
+		 * OEVTEN.OTGADevSessEndDetEvntEn = 1
+		 * We don't want HNP/role-swap so leave these disabled.
+		 */
+
+		/* GUSB2PHYCFG.ULPIAutoRes = 1/0, GUSB2PHYCFG.SusPHY = 1 */
+		if (!dwc->dis_u2_susphy_quirk) {
+			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
+			reg |= DWC3_GUSB2PHYCFG_SUSPHY;
+			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
+		}
+
+		/* Set Port Power to enable VBUS: OCTL.PrtPwrCtl = 1 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCTL);
+		reg |= DWC3_OCTL_PRTPWRCTL;
+		dwc3_writel(dwc->regs, DWC3_OCTL, reg);
+	} else {
+		/*
+		 * Exit from A-device flow as per
+		 * Figure 11-4 OTG Driver Overall Programming Flow
+		 */
+		/* stop the HCD */
+		if (!skip) {
+			spin_unlock(&dwc->lock);
+			dwc3_host_exit(dwc);
+			spin_lock(&dwc->lock);
+		}
+
+		/*
+		 * OEVTEN.OTGADevBHostEndEvntEn=0, OEVTEN.OTGADevHNPChngEvntEn=0
+		 * OEVTEN.OTGADevSessEndDetEvntEn=0,
+		 * OEVTEN.OTGADevHostEvntEn = 0
+		 * But we don't disable any OTG events
+		 */
+
+		/* OCTL.HstSetHNPEn = 0, OCTL.PrtPwrCtl=0 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCTL);
+		reg &= ~(DWC3_OCTL_HSTSETHNPEN | DWC3_OCTL_PRTPWRCTL);
+		dwc3_writel(dwc->regs, DWC3_OCTL, reg);
+
+		/* Initialize OTG registers */
+		dwc3_otgregs_init(dwc);
+	}
+
+	return 0;
+}
+
+/* dwc->lock must be held */
+static int dwc3_drd_start_gadget(struct dwc3 *dwc, int on)
+{
+	u32 reg;
+
+	if (on)
+		dwc3_event_buffers_setup(dwc);
+
+	if (on) {
+		/* As per Figure 11-20 B-Device Flow Diagram */
+
+		/*
+		 * OCFG.HNPCap = GHWPARAMS6.HNP_CAP, OCFG.SRPCap = 1
+		 * but we set them to 0 for simple dual-role operation.
+		 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCFG);
+		reg &= ~(DWC3_OCFG_SRPCAP | DWC3_OCFG_HNPCAP);
+		/* OCFG.OTGSftRstMsk = 0/1 */
+		reg |= DWC3_OCFG_SFTRSTMASK;
+		dwc3_writel(dwc->regs, DWC3_OCFG, reg);
+		/*
+		 * OCTL.PeriMode = 1
+		 * OCTL.TermSelDLPulse = 0/1, OCTL.HNPReq = 0
+		 * OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0
+		 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCTL);
+		reg |= DWC3_OCTL_PERIMODE;
+		reg &= ~(DWC3_OCTL_TERMSELIDPULSE | DWC3_OCTL_HNPREQ |
+			 DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN);
+		dwc3_writel(dwc->regs, DWC3_OCTL, reg);
+		/* OEVTEN.OTGBDevSesVldDetEvntEn = 1 */
+		dwc3_otg_enable_events(dwc, DWC3_OEVT_BDEVSESSVLDDET);
+		/* GUSB2PHYCFG.ULPIAutoRes = 0, GUSB2PHYCFG0.SusPHY = 1 */
+		if (!dwc->dis_u2_susphy_quirk) {
+			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
+			reg |= DWC3_GUSB2PHYCFG_SUSPHY;
+			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
+		}
+		/* GCTL.GblHibernationEn = 0 */
+		reg = dwc3_readl(dwc->regs, DWC3_GCTL);
+		reg &= ~DWC3_GCTL_GBLHIBERNATIONEN;
+		dwc3_writel(dwc->regs, DWC3_GCTL, reg);
+
+		/* start the Peripheral driver  */
+		if (dwc->gadget_driver) {
+			__dwc3_gadget_start(dwc);
+			if (dwc->gadget_pullup)
+				dwc3_gadget_run_stop(dwc, true, false);
+		}
+	} else {
+		/*
+		 * Exit from B-device flow as per
+		 * Figure 11-4 OTG Driver Overall Programming Flow
+		 */
+		/* stop the Peripheral driver */
+		if (dwc->gadget_driver) {
+			if (dwc->gadget_pullup)
+				dwc3_gadget_run_stop(dwc, false, false);
+			spin_unlock(&dwc->lock);
+			if (dwc->gadget_driver->disconnect)
+				dwc->gadget_driver->disconnect(&dwc->gadget);
+			spin_lock(&dwc->lock);
+			__dwc3_gadget_stop(dwc);
+		}
+
+		/*
+		 * OEVTEN.OTGBDevHNPChngEvntEn = 0
+		 * OEVTEN.OTGBDevVBusChngEvntEn = 0
+		 * OEVTEN.OTGBDevBHostEndEvntEn = 0
+		 */
+		reg = dwc3_readl(dwc->regs, DWC3_OEVTEN);
+		reg &= ~(DWC3_OEVT_BDEVHNPCHNG | DWC3_OEVT_BDEVVBUSCHNG |
+			 DWC3_OEVT_BDEVBHOSTEND);
+		dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
+
+		/* OCTL.DevSetHNPEn = 0, OCTL.HNPReq = 0, OCTL.PeriMode=1 */
+		reg = dwc3_readl(dwc->regs, DWC3_OCTL);
+		reg &= ~(DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HNPREQ);
+		reg |= DWC3_OCTL_PERIMODE;
+		dwc3_writel(dwc->regs, DWC3_OCTL, reg);
+
+		/* Initialize OTG registers */
+		dwc3_otgregs_init(dwc);
+	}
+
+	return 0;
+}
+
+static int dwc3_otg_get_irq(struct dwc3 *dwc)
+{
+	struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
+	int irq;
+
+	irq = platform_get_irq_byname(dwc3_pdev, "otg");
+	if (irq > 0)
+		goto out;
+
+	if (irq == -EPROBE_DEFER)
+		goto out;
+
+	irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
+	if (irq > 0)
+		goto out;
+
+	if (irq == -EPROBE_DEFER)
+		goto out;
+
+	irq = platform_get_irq(dwc3_pdev, 0);
+	if (irq > 0)
+		goto out;
+
+	if (irq != -EPROBE_DEFER)
+		dev_err(dwc->dev, "missing otg IRQ\n");
+
+	if (!irq)
+		irq = -EINVAL;
+
+out:
+	return irq;
+}
+
+/* dwc->lock must be held */
+static void dwc3_otg_core_init(struct dwc3 *dwc)
+{
+	u32 reg;
+
+	/*
+	 * As per Figure 11-4 OTG Driver Overall Programming Flow,
+	 * block "Initialize GCTL for OTG operation".
+	 */
+	/* GCTL.PrtCapDir=2'b11 */
+	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
+	/* GUSB2PHYCFG0.SusPHY=0 */
+	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
+	reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
+	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
+
+	/* Initialize OTG registers */
+	dwc3_otgregs_init(dwc);
+
+	/* force drd state machine update the first time */
+	dwc->otg_fsm.b_sess_vld = -1;
+	dwc->otg_fsm.id = -1;
+}
+
+/* dwc->lock must be held */
+static void dwc3_otg_core_exit(struct dwc3 *dwc)
+{
+	/* disable all otg irqs */
+	dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
+	/* clear all events */
+	dwc3_writel(dwc->regs, DWC3_OEVT, ~0);
+}
+
+static int dwc3_drd_init(struct dwc3 *dwc)
+{
+	int ret, irq;
+	unsigned long flags;
+
+	INIT_WORK(&dwc->otg_work, dwc3_drd_work);
+
+	irq = dwc3_otg_get_irq(dwc);
+	if (irq < 0)
+		return irq;
+
+	dwc->otg_irq = irq;
+
+	/* disable all otg irqs */
+	dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
+	/* clear all events */
+	dwc3_writel(dwc->regs, DWC3_OEVT, ~0);
+
+	irq_set_status_flags(dwc->otg_irq, IRQ_NOAUTOEN);
+	ret = request_threaded_irq(dwc->otg_irq, dwc3_otg_irq,
+				   dwc3_otg_thread_irq,
+				   IRQF_SHARED, "dwc3-otg", dwc);
+	if (ret) {
+		dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
+			dwc->otg_irq, ret);
+		ret = -ENODEV;
+		return ret;
+	}
+
+	ret = dwc3_gadget_init(dwc);
+	if (ret) {
+		free_irq(dwc->otg_irq, dwc);
+		return ret;
+	}
+
+	spin_lock_irqsave(&dwc->lock, flags);
+	dwc3_otg_core_init(dwc);
+	spin_unlock_irqrestore(&dwc->lock, flags);
+	queue_work(system_power_efficient_wq, &dwc->otg_work);
+
+	return 0;
+}
+
+static void dwc3_drd_exit(struct dwc3 *dwc)
+{
+	unsigned long flags;
+
+	cancel_work_sync(&dwc->otg_work);
+	spin_lock_irqsave(&dwc->lock, flags);
+	dwc3_otg_core_exit(dwc);
+	if (dwc->otg_fsm.protocol == PROTO_HOST)
+		dwc3_drd_start_host(dwc, 0, 0);
+	dwc->otg_fsm.protocol = PROTO_UNDEF;
+	free_irq(dwc->otg_irq, dwc);
+	spin_unlock_irqrestore(&dwc->lock, flags);
+
+	dwc3_gadget_exit(dwc);
+}
+
+/* -------------------------------------------------------------------------- */
+
 static int dwc3_core_init_mode(struct dwc3 *dwc)
 {
 	struct device *dev = dwc->dev;
@@ -862,17 +1363,10 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 		}
 		break;
 	case USB_DR_MODE_OTG:
-		ret = dwc3_host_init(dwc);
-		if (ret) {
-			if (ret != -EPROBE_DEFER)
-				dev_err(dev, "failed to initialize host\n");
-			return ret;
-		}
-
-		ret = dwc3_gadget_init(dwc);
+		ret = dwc3_drd_init(dwc);
 		if (ret) {
 			if (ret != -EPROBE_DEFER)
-				dev_err(dev, "failed to initialize gadget\n");
+				dev_err(dev, "failed to initialize dual-role\n");
 			return ret;
 		}
 		break;
@@ -894,8 +1388,7 @@ static void dwc3_core_exit_mode(struct dwc3 *dwc)
 		dwc3_host_exit(dwc);
 		break;
 	case USB_DR_MODE_OTG:
-		dwc3_host_exit(dwc);
-		dwc3_gadget_exit(dwc);
+		dwc3_drd_exit(dwc);
 		break;
 	default:
 		/* do nothing */
@@ -1207,19 +1700,35 @@ static int dwc3_suspend_common(struct dwc3 *dwc)
 {
 	unsigned long	flags;
 
+	spin_lock_irqsave(&dwc->lock, flags);
+
 	switch (dwc->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
-	case USB_DR_MODE_OTG:
-		spin_lock_irqsave(&dwc->lock, flags);
 		dwc3_gadget_suspend(dwc);
-		spin_unlock_irqrestore(&dwc->lock, flags);
+		break;
+	case USB_DR_MODE_OTG:
+		switch (dwc->otg_fsm.protocol) {
+		case PROTO_GADGET:
+			dwc3_gadget_suspend(dwc);
+			break;
+		case PROTO_HOST:
+		case PROTO_UNDEF:
+		default:
+			/* nothing */
+			break;
+		}
 		break;
 	case USB_DR_MODE_HOST:
+	case USB_DR_MODE_UNKNOWN:
 	default:
 		/* do nothing */
 		break;
 	}
 
+	if (dwc->dr_mode == USB_DR_MODE_OTG)
+		dwc3_otg_core_exit(dwc);
+
+	spin_unlock_irqrestore(&dwc->lock, flags);
 	dwc3_core_exit(dwc);
 
 	return 0;
@@ -1234,19 +1743,40 @@ static int dwc3_resume_common(struct dwc3 *dwc)
 	if (ret)
 		return ret;
 
+	spin_lock_irqsave(&dwc->lock, flags);
+
 	switch (dwc->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
-	case USB_DR_MODE_OTG:
-		spin_lock_irqsave(&dwc->lock, flags);
 		dwc3_gadget_resume(dwc);
-		spin_unlock_irqrestore(&dwc->lock, flags);
-		/* FALLTHROUGH */
+		break;
+	case USB_DR_MODE_OTG:
+		switch (dwc->otg_fsm.protocol) {
+		case PROTO_GADGET:
+			dwc3_gadget_resume(dwc);
+			break;
+		case PROTO_HOST:
+			break;
+		case PROTO_UNDEF:
+		default:
+			/* nothing */
+			break;
+		}
+		break;
 	case USB_DR_MODE_HOST:
+	case USB_DR_MODE_UNKNOWN:
 	default:
 		/* do nothing */
 		break;
 	}
 
+	if (dwc->dr_mode == USB_DR_MODE_OTG) {
+		dwc3_otg_core_init(dwc);
+		if (dwc->otg_fsm.protocol == PROTO_HOST)
+			dwc3_drd_start_host(dwc, true, 1);
+	}
+
+	spin_unlock_irqrestore(&dwc->lock, flags);
+
 	return 0;
 }
 
@@ -1301,6 +1831,7 @@ static int dwc3_runtime_resume(struct device *dev)
 		dwc3_gadget_process_pending_events(dwc);
 		break;
 	case USB_DR_MODE_HOST:
+	case USB_DR_MODE_UNKNOWN:
 	default:
 		/* do nothing */
 		break;
@@ -1336,6 +1867,30 @@ static int dwc3_runtime_idle(struct device *dev)
 #endif /* CONFIG_PM */
 
 #ifdef CONFIG_PM_SLEEP
+static int dwc3_prepare(struct device *dev)
+{
+	struct dwc3	*dwc = dev_get_drvdata(dev);
+	unsigned long	flags;
+
+	spin_lock_irqsave(&dwc->lock, flags);
+	dwc->otg_prevent_sync = true;
+	spin_unlock_irqrestore(&dwc->lock, flags);
+
+	return 0;
+}
+
+static void dwc3_complete(struct device *dev)
+{
+	struct dwc3	*dwc = dev_get_drvdata(dev);
+	unsigned long	flags;
+
+	spin_lock_irqsave(&dwc->lock, flags);
+	dwc->otg_prevent_sync = false;
+	spin_unlock_irqrestore(&dwc->lock, flags);
+	if (dwc->dr_mode == USB_DR_MODE_OTG)
+		queue_work(system_power_efficient_wq, &dwc->otg_work);
+}
+
 static int dwc3_suspend(struct device *dev)
 {
 	struct dwc3	*dwc = dev_get_drvdata(dev);
@@ -1373,6 +1928,10 @@ static const struct dev_pm_ops dwc3_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
 	SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
 			dwc3_runtime_idle)
+#ifdef CONFIG_PM_SLEEP
+	.prepare = dwc3_prepare,
+	.complete = dwc3_complete,
+#endif
 };
 
 #ifdef CONFIG_OF
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index fc82d2e..bf8951d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -35,6 +35,11 @@
 
 #include <linux/phy/phy.h>
 
+#include <linux/usb/otg.h>
+#include <linux/usb/otg-fsm.h>
+
+#include <linux/workqueue.h>
+
 #define DWC3_MSG_MAX	500
 
 /* Global constants */
@@ -854,15 +859,23 @@ struct dwc3_scratchpad_array {
  * @event_buffer_list: a list of event buffers
  * @gadget: device side representation of the peripheral controller
  * @gadget_driver: pointer to the gadget driver
+ * @gadget_pullup: gadget driver's pullup request flag
  * @regs: base address for our registers
  * @regs_size: address space size
+ * @dr_mode: requested mode of operation
+ * @otg: usb otg data structure
+ * @otg-fsm: usb otg fsm data structure
+ * @otg_prevent_sync: flag to block events to otg fsm
+ * @current_mode: current mode of operation written to PRTCAPDIR
+ * @otg_work: work struct for otg/dual-role
+ * @otg_needs_host_start: flag that OTG controller needs to start host
  * @fladj: frame length adjustment
  * @irq_gadget: peripheral controller's IRQ number
+ * @otg_irq: IRQ number for OTG IRQs
  * @nr_scratch: number of scratch buffers
  * @u1u2: only used on revisions <1.83a for workaround
  * @maximum_speed: maximum speed requested (mainly for testing purposes)
  * @revision: revision register contents
- * @dr_mode: requested mode of operation
  * @hsphy_mode: UTMI phy mode, one of following:
  *		- USBPHY_INTERFACE_MODE_UTMI
  *		- USBPHY_INTERFACE_MODE_UTMIW
@@ -873,6 +886,9 @@ struct dwc3_scratchpad_array {
  * @ulpi: pointer to ulpi interface
  * @dcfg: saved contents of DCFG register
  * @gctl: saved contents of GCTL register
+ * @ocfg: saved contents of OCFG register
+ * @octl: saved contents of OCTL register
+ * @oevten: saved contents of OEVTEN register
  * @isoch_delay: wValue from Set Isochronous Delay request;
  * @u2sel: parameter from Set SEL request.
  * @u2pel: parameter from Set SEL request.
@@ -964,6 +980,7 @@ struct dwc3 {
 
 	struct usb_gadget	gadget;
 	struct usb_gadget_driver *gadget_driver;
+	bool			gadget_pullup;
 
 	struct usb_phy		*usb2_phy;
 	struct usb_phy		*usb3_phy;
@@ -973,14 +990,30 @@ struct dwc3 {
 
 	struct ulpi		*ulpi;
 
+	/* used for suspend/resume */
+	u32			dcfg;
+	u32			gctl;
+	u32			ocfg;
+	u32			octl;
+	u32			oevten;
+
 	void __iomem		*regs;
 	size_t			regs_size;
 
 	enum usb_dr_mode	dr_mode;
+	struct usb_otg		otg;
+	struct otg_fsm		otg_fsm;
+	bool			otg_prevent_sync;
+	u32			current_mode;
+	struct work_struct	otg_work;
+	bool			otg_needs_host_start;
+
 	enum usb_phy_interface	hsphy_mode;
 
 	u32			fladj;
 	u32			irq_gadget;
+	int			otg_irq;
+
 	u32			nr_scratch;
 	u32			u1u2;
 	u32			maximum_speed;
@@ -1277,6 +1310,9 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state);
 int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
 		struct dwc3_gadget_ep_cmd_params *params);
 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param);
+int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend);
+int __dwc3_gadget_start(struct dwc3 *dwc);
+void __dwc3_gadget_stop(struct dwc3 *dwc);
 #else
 static inline int dwc3_gadget_init(struct dwc3 *dwc)
 { return 0; }
@@ -1296,6 +1332,12 @@ static inline int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
 static inline int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
 		int cmd, u32 param)
 { return 0; }
+static inline int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
+{ return 0; }
+static inline int __dwc3_gadget_start(struct dwc3 *dwc)
+{ return 0; }
+static inline void __dwc3_gadget_stop(struct dwc3 *dwc)
+{ }
 #endif
 
 /* power management interface */
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1341ed4..68a0e99 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1534,7 +1534,7 @@ static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
 	return 0;
 }
 
-static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
+int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
 {
 	u32			reg;
 	u32			timeout = 500;
@@ -1542,6 +1542,10 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
 	if (pm_runtime_suspended(dwc->dev))
 		return 0;
 
+	if (dwc->dr_mode == USB_DR_MODE_OTG &&
+	    dwc->otg_fsm.protocol != PROTO_GADGET)
+		return 0;
+
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	if (is_on) {
 		if (dwc->revision <= DWC3_REVISION_187A) {
@@ -1603,6 +1607,7 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
 	}
 
 	spin_lock_irqsave(&dwc->lock, flags);
+	dwc->gadget_pullup = is_on;
 	ret = dwc3_gadget_run_stop(dwc, is_on, false);
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
@@ -1679,7 +1684,7 @@ static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
 	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 }
 
-static int __dwc3_gadget_start(struct dwc3 *dwc)
+int __dwc3_gadget_start(struct dwc3 *dwc)
 {
 	struct dwc3_ep		*dep;
 	int			ret = 0;
@@ -1812,8 +1817,11 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 
 	dwc->gadget_driver	= driver;
 
-	if (pm_runtime_active(dwc->dev))
-		__dwc3_gadget_start(dwc);
+	if (pm_runtime_active(dwc->dev)) {
+		if (!(dwc->dr_mode == USB_DR_MODE_OTG &&
+		      dwc->otg_fsm.protocol != PROTO_GADGET))
+			__dwc3_gadget_start(dwc);
+	}
 
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
@@ -1827,7 +1835,7 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 	return ret;
 }
 
-static void __dwc3_gadget_stop(struct dwc3 *dwc)
+void __dwc3_gadget_stop(struct dwc3 *dwc)
 {
 	dwc3_gadget_disable_irq(dwc);
 	__dwc3_gadget_ep_disable(dwc->eps[0]);
