21 files changed, 321 insertions, 250 deletions

diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index 0b7f1edd9eec..c063fb042926 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -931,7 +931,7 @@ static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
 
 static int fill_buffer(struct debug_buffer *buf)
 {
-	int ret = 0;
+	int ret;
 
 	if (!buf->output_buf)
 		buf->output_buf = vmalloc(buf->alloc_size);
@@ -956,7 +956,7 @@ static ssize_t debug_output(struct file *file, char __user *user_buf,
 		size_t len, loff_t *offset)
 {
 	struct debug_buffer *buf = file->private_data;
-	int ret = 0;
+	int ret;
 
 	mutex_lock(&buf->mutex);
 	if (buf->count == 0) {
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index e87cf3a00fa4..638f03b89739 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -21,6 +21,9 @@ static const char hcd_name[] = "ehci-pci";
 /* defined here to avoid adding to pci_ids.h for single instance use */
 #define PCI_DEVICE_ID_INTEL_CE4100_USB	0x2e70
 
+#define PCI_VENDOR_ID_ASPEED		0x1a03
+#define PCI_DEVICE_ID_ASPEED_EHCI	0x2603
+
 /*-------------------------------------------------------------------------*/
 #define PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC		0x0939
 static inline bool is_intel_quark_x1000(struct pci_dev *pdev)
@@ -222,6 +225,12 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
 			ehci->has_synopsys_hc_bug = 1;
 		}
 		break;
+	case PCI_VENDOR_ID_ASPEED:
+		if (pdev->device == PCI_DEVICE_ID_ASPEED_EHCI) {
+			ehci_info(ehci, "applying Aspeed HC workaround\n");
+			ehci->is_aspeed = 1;
+		}
+		break;
 	}
 
 	/* optional debug port, normally in the first BAR */
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index c3dc906274d9..1115431a255d 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -43,7 +43,6 @@
 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
 
 #define BCM_USB_FIFO_THRESHOLD	0x00800040
-#define bcm_iproc_insnreg01	hostpc[0]
 
 struct ehci_platform_priv {
 	struct clk *clks[EHCI_MAX_CLKS];
@@ -81,7 +80,7 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
 
 	if (of_device_is_compatible(pdev->dev.of_node, "brcm,xgs-iproc-ehci"))
 		ehci_writel(ehci, BCM_USB_FIFO_THRESHOLD,
-			    &ehci->regs->bcm_iproc_insnreg01);
+			    &ehci->regs->brcm_insnreg[1]);
 
 	return 0;
 }
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 2cbf4f85bff3..a2a5c2996350 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -33,12 +33,13 @@
 
 /* fill a qtd, returning how much of the buffer we were able to queue up */
 
-static int
+static unsigned int
 qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf,
 		  size_t len, int token, int maxpacket)
 {
-	int	i, count;
+	unsigned int count;
 	u64	addr = buf;
+	int	i;
 
 	/* one buffer entry per 4K ... first might be short or unaligned */
 	qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr);
@@ -652,7 +653,7 @@ qh_urb_transaction (
 	 * and may serve as a control status ack
 	 */
 	for (;;) {
-		int this_qtd_len;
+		unsigned int this_qtd_len;
 
 		this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token,
 				maxpacket);
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 0f85aa9b2fb1..bd542b6fc46b 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1165,10 +1165,8 @@ static struct ehci_iso_sched *
 iso_sched_alloc(unsigned packets, gfp_t mem_flags)
 {
 	struct ehci_iso_sched	*iso_sched;
-	int			size = sizeof(*iso_sched);
 
-	size += packets * sizeof(struct ehci_iso_packet);
-	iso_sched = kzalloc(size, mem_flags);
+	iso_sched = kzalloc(struct_size(iso_sched, packet, packets), mem_flags);
 	if (likely(iso_sched != NULL))
 		INIT_LIST_HEAD(&iso_sched->td_list);
 
diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c
index 7af17c8e069b..c3fd375b4778 100644
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -4014,10 +4014,8 @@ static struct fotg210_iso_sched *iso_sched_alloc(unsigned packets,
 		gfp_t mem_flags)
 {
 	struct fotg210_iso_sched *iso_sched;
-	int size = sizeof(*iso_sched);
 
-	size += packets * sizeof(struct fotg210_iso_packet);
-	iso_sched = kzalloc(size, mem_flags);
+	iso_sched = kzalloc(struct_size(iso_sched, packet, packets), mem_flags);
 	if (likely(iso_sched != NULL))
 		INIT_LIST_HEAD(&iso_sched->td_list);
 
diff --git a/drivers/usb/host/ohci-dbg.c b/drivers/usb/host/ohci-dbg.c
index 4f267dc93882..76bc8d56325d 100644
--- a/drivers/usb/host/ohci-dbg.c
+++ b/drivers/usb/host/ohci-dbg.c
@@ -680,7 +680,7 @@ static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
 
 static int fill_buffer(struct debug_buffer *buf)
 {
-	int ret = 0;
+	int ret;
 
 	if (!buf->page)
 		buf->page = (char *)get_zeroed_page(GFP_KERNEL);
@@ -705,7 +705,7 @@ static ssize_t debug_output(struct file *file, char __user *user_buf,
 			size_t len, loff_t *offset)
 {
 	struct debug_buffer *buf = file->private_data;
-	int ret = 0;
+	int ret;
 
 	mutex_lock(&buf->mutex);
 	if (buf->count == 0) {
diff --git a/drivers/usb/host/oxu210hp-hcd.c b/drivers/usb/host/oxu210hp-hcd.c
index e82ff2a49672..b741670525e3 100644
--- a/drivers/usb/host/oxu210hp-hcd.c
+++ b/drivers/usb/host/oxu210hp-hcd.c
@@ -1685,7 +1685,7 @@ static struct list_head *qh_urb_transaction(struct oxu_hcd *oxu,
 		token |= (1 /* "in" */ << 8);
 	/* else it's already initted to "out" pid (0 << 8) */
 
-	maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
+	maxpacket = usb_maxpacket(urb->dev, urb->pipe, !is_input);
 
 	/*
 	 * buffer gets wrapped in one or more qtds;
diff --git a/drivers/usb/host/xen-hcd.c b/drivers/usb/host/xen-hcd.c
index 19b8c7ed74cb..210f91bf661c 100644
--- a/drivers/usb/host/xen-hcd.c
+++ b/drivers/usb/host/xen-hcd.c
@@ -51,6 +51,7 @@ struct vdevice_status {
 struct usb_shadow {
 	struct xenusb_urb_request req;
 	struct urb *urb;
+	bool in_flight;
 };
 
 struct xenhcd_info {
@@ -589,14 +590,12 @@ static void xenhcd_gnttab_map(struct xenhcd_info *info, void *addr, int length,
 			      int nr_pages, int flags)
 {
 	grant_ref_t ref;
-	unsigned long buffer_mfn;
 	unsigned int offset;
 	unsigned int len = length;
 	unsigned int bytes;
 	int i;
 
 	for (i = 0; i < nr_pages; i++) {
-		buffer_mfn = PFN_DOWN(arbitrary_virt_to_machine(addr).maddr);
 		offset = offset_in_page(addr);
 
 		bytes = PAGE_SIZE - offset;
@@ -605,7 +604,7 @@ static void xenhcd_gnttab_map(struct xenhcd_info *info, void *addr, int length,
 
 		ref = gnttab_claim_grant_reference(gref_head);
 		gnttab_grant_foreign_access_ref(ref, info->xbdev->otherend_id,
-						buffer_mfn, flags);
+						virt_to_gfn(addr), flags);
 		seg[i].gref = ref;
 		seg[i].offset = (__u16)offset;
 		seg[i].length = (__u16)bytes;
@@ -722,6 +721,12 @@ static void xenhcd_gnttab_done(struct xenhcd_info *info, unsigned int id)
 	int nr_segs = 0;
 	int i;
 
+	if (!shadow->in_flight) {
+		xenhcd_set_error(info, "Illegal request id");
+		return;
+	}
+	shadow->in_flight = false;
+
 	nr_segs = shadow->req.nr_buffer_segs;
 
 	if (xenusb_pipeisoc(shadow->req.pipe))
@@ -805,6 +810,7 @@ static int xenhcd_do_request(struct xenhcd_info *info, struct urb_priv *urbp)
 
 	info->urb_ring.req_prod_pvt++;
 	info->shadow[id].urb = urb;
+	info->shadow[id].in_flight = true;
 
 	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&info->urb_ring, notify);
 	if (notify)
@@ -933,10 +939,27 @@ static int xenhcd_unlink_urb(struct xenhcd_info *info, struct urb_priv *urbp)
 	return ret;
 }
 
-static int xenhcd_urb_request_done(struct xenhcd_info *info)
+static void xenhcd_res_to_urb(struct xenhcd_info *info,
+			      struct xenusb_urb_response *res, struct urb *urb)
+{
+	if (unlikely(!urb))
+		return;
+
+	if (res->actual_length > urb->transfer_buffer_length)
+		urb->actual_length = urb->transfer_buffer_length;
+	else if (res->actual_length < 0)
+		urb->actual_length = 0;
+	else
+		urb->actual_length = res->actual_length;
+	urb->error_count = res->error_count;
+	urb->start_frame = res->start_frame;
+	xenhcd_giveback_urb(info, urb, res->status);
+}
+
+static int xenhcd_urb_request_done(struct xenhcd_info *info,
+				   unsigned int *eoiflag)
 {
 	struct xenusb_urb_response res;
-	struct urb *urb;
 	RING_IDX i, rp;
 	__u16 id;
 	int more_to_do = 0;
@@ -963,16 +986,12 @@ static int xenhcd_urb_request_done(struct xenhcd_info *info)
 			xenhcd_gnttab_done(info, id);
 			if (info->error)
 				goto err;
-			urb = info->shadow[id].urb;
-			if (likely(urb)) {
-				urb->actual_length = res.actual_length;
-				urb->error_count = res.error_count;
-				urb->start_frame = res.start_frame;
-				xenhcd_giveback_urb(info, urb, res.status);
-			}
+			xenhcd_res_to_urb(info, &res, info->shadow[id].urb);
 		}
 
 		xenhcd_add_id_to_freelist(info, id);
+
+		*eoiflag = 0;
 	}
 	info->urb_ring.rsp_cons = i;
 
@@ -990,7 +1009,7 @@ static int xenhcd_urb_request_done(struct xenhcd_info *info)
 	return 0;
 }
 
-static int xenhcd_conn_notify(struct xenhcd_info *info)
+static int xenhcd_conn_notify(struct xenhcd_info *info, unsigned int *eoiflag)
 {
 	struct xenusb_conn_response res;
 	struct xenusb_conn_request *req;
@@ -1035,6 +1054,8 @@ static int xenhcd_conn_notify(struct xenhcd_info *info)
 				       info->conn_ring.req_prod_pvt);
 		req->id = id;
 		info->conn_ring.req_prod_pvt++;
+
+		*eoiflag = 0;
 	}
 
 	if (rc != info->conn_ring.req_prod_pvt)
@@ -1057,14 +1078,19 @@ static int xenhcd_conn_notify(struct xenhcd_info *info)
 static irqreturn_t xenhcd_int(int irq, void *dev_id)
 {
 	struct xenhcd_info *info = (struct xenhcd_info *)dev_id;
+	unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS;
 
-	if (unlikely(info->error))
+	if (unlikely(info->error)) {
+		xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
 		return IRQ_HANDLED;
+	}
 
-	while (xenhcd_urb_request_done(info) | xenhcd_conn_notify(info))
+	while (xenhcd_urb_request_done(info, &eoiflag) |
+	       xenhcd_conn_notify(info, &eoiflag))
 		/* Yield point for this unbounded loop. */
 		cond_resched();
 
+	xen_irq_lateeoi(irq, eoiflag);
 	return IRQ_HANDLED;
 }
 
@@ -1141,9 +1167,9 @@ static int xenhcd_setup_rings(struct xenbus_device *dev,
 		goto fail;
 	}
 
-	err = bind_evtchn_to_irq(info->evtchn);
+	err = bind_evtchn_to_irq_lateeoi(info->evtchn);
 	if (err <= 0) {
-		xenbus_dev_fatal(dev, err, "bind_evtchn_to_irq");
+		xenbus_dev_fatal(dev, err, "bind_evtchn_to_irq_lateeoi");
 		goto fail;
 	}
 
@@ -1496,6 +1522,7 @@ static struct usb_hcd *xenhcd_create_hcd(struct xenbus_device *dev)
 	for (i = 0; i < XENUSB_URB_RING_SIZE; i++) {
 		info->shadow[i].req.id = i + 1;
 		info->shadow[i].urb = NULL;
+		info->shadow[i].in_flight = false;
 	}
 	info->shadow[XENUSB_URB_RING_SIZE - 1].req.id = 0x0fff;
 
diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index ccb0156fcebe..e61155fa6379 100644
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -914,59 +914,6 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 	mod_delayed_work(system_wq, &dbc->event_work, 1);
 }
 
-static void xhci_do_dbc_exit(struct xhci_hcd *xhci)
-{
-	unsigned long		flags;
-
-	spin_lock_irqsave(&xhci->lock, flags);
-	kfree(xhci->dbc);
-	xhci->dbc = NULL;
-	spin_unlock_irqrestore(&xhci->lock, flags);
-}
-
-static int xhci_do_dbc_init(struct xhci_hcd *xhci)
-{
-	u32			reg;
-	struct xhci_dbc		*dbc;
-	unsigned long		flags;
-	void __iomem		*base;
-	int			dbc_cap_offs;
-
-	base = &xhci->cap_regs->hc_capbase;
-	dbc_cap_offs = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_DEBUG);
-	if (!dbc_cap_offs)
-		return -ENODEV;
-
-	dbc = kzalloc(sizeof(*dbc), GFP_KERNEL);
-	if (!dbc)
-		return -ENOMEM;
-
-	dbc->regs = base + dbc_cap_offs;
-
-	/* We will avoid using DbC in xhci driver if it's in use. */
-	reg = readl(&dbc->regs->control);
-	if (reg & DBC_CTRL_DBC_ENABLE) {
-		kfree(dbc);
-		return -EBUSY;
-	}
-
-	spin_lock_irqsave(&xhci->lock, flags);
-	if (xhci->dbc) {
-		spin_unlock_irqrestore(&xhci->lock, flags);
-		kfree(dbc);
-		return -EBUSY;
-	}
-	xhci->dbc = dbc;
-	spin_unlock_irqrestore(&xhci->lock, flags);
-
-	dbc->xhci = xhci;
-	dbc->dev = xhci_to_hcd(xhci)->self.sysdev;
-	INIT_DELAYED_WORK(&dbc->event_work, xhci_dbc_handle_events);
-	spin_lock_init(&dbc->lock);
-
-	return 0;
-}
-
 static ssize_t dbc_show(struct device *dev,
 			struct device_attribute *attr,
 			char *buf)
@@ -1026,44 +973,86 @@ static ssize_t dbc_store(struct device *dev,
 
 static DEVICE_ATTR_RW(dbc);
 
-int xhci_dbc_init(struct xhci_hcd *xhci)
+struct xhci_dbc *
+xhci_alloc_dbc(struct device *dev, void __iomem *base, const struct dbc_driver *driver)
 {
+	struct xhci_dbc		*dbc;
 	int			ret;
-	struct device		*dev = xhci_to_hcd(xhci)->self.controller;
 
-	ret = xhci_do_dbc_init(xhci);
-	if (ret)
-		goto init_err3;
+	dbc = kzalloc(sizeof(*dbc), GFP_KERNEL);
+	if (!dbc)
+		return NULL;
 
-	ret = xhci_dbc_tty_probe(xhci);
-	if (ret)
-		goto init_err2;
+	dbc->regs = base;
+	dbc->dev = dev;
+	dbc->driver = driver;
+
+	if (readl(&dbc->regs->control) & DBC_CTRL_DBC_ENABLE)
+		return NULL;
+
+	INIT_DELAYED_WORK(&dbc->event_work, xhci_dbc_handle_events);
+	spin_lock_init(&dbc->lock);
 
 	ret = device_create_file(dev, &dev_attr_dbc);
 	if (ret)
-		goto init_err1;
+		goto err;
 
-	return 0;
+	return dbc;
+err:
+	kfree(dbc);
+	return NULL;
+}
+
+/* undo what xhci_alloc_dbc() did */
+void xhci_dbc_remove(struct xhci_dbc *dbc)
+{
+	if (!dbc)
+		return;
+	/* stop hw, stop wq and call dbc->ops->stop() */
+	xhci_dbc_stop(dbc);
+
+	/* remove sysfs files */
+	device_remove_file(dbc->dev, &dev_attr_dbc);
+
+	kfree(dbc);
+}
+
+
+int xhci_create_dbc_dev(struct xhci_hcd *xhci)
+{
+	struct device		*dev;
+	void __iomem		*base;
+	int			ret;
+	int			dbc_cap_offs;
+
+	/* create all parameters needed resembling a dbc device */
+	dev = xhci_to_hcd(xhci)->self.controller;
+	base = &xhci->cap_regs->hc_capbase;
+
+	dbc_cap_offs = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_DEBUG);
+	if (!dbc_cap_offs)
+		return -ENODEV;
+
+	/* already allocated and in use */
+	if (xhci->dbc)
+		return -EBUSY;
+
+	ret = xhci_dbc_tty_probe(dev, base + dbc_cap_offs, xhci);
 
-init_err1:
-	xhci_dbc_tty_remove(xhci->dbc);
-init_err2:
-	xhci_do_dbc_exit(xhci);
-init_err3:
 	return ret;
 }
 
-void xhci_dbc_exit(struct xhci_hcd *xhci)
+void xhci_remove_dbc_dev(struct xhci_hcd *xhci)
 {
-	struct device		*dev = xhci_to_hcd(xhci)->self.controller;
+	unsigned long		flags;
 
 	if (!xhci->dbc)
 		return;
 
-	device_remove_file(dev, &dev_attr_dbc);
 	xhci_dbc_tty_remove(xhci->dbc);
-	xhci_dbc_stop(xhci->dbc);
-	xhci_do_dbc_exit(xhci);
+	spin_lock_irqsave(&xhci->lock, flags);
+	xhci->dbc = NULL;
+	spin_unlock_irqrestore(&xhci->lock, flags);
 }
 
 #ifdef CONFIG_PM
@@ -1098,3 +1087,13 @@ int xhci_dbc_resume(struct xhci_hcd *xhci)
 	return ret;
 }
 #endif /* CONFIG_PM */
+
+int xhci_dbc_init(void)
+{
+	return dbc_tty_init();
+}
+
+void xhci_dbc_exit(void)
+{
+	dbc_tty_exit();
+}
diff --git a/drivers/usb/host/xhci-dbgcap.h b/drivers/usb/host/xhci-dbgcap.h
index c70b78d504eb..ca04192fdab1 100644
--- a/drivers/usb/host/xhci-dbgcap.h
+++ b/drivers/usb/host/xhci-dbgcap.h
@@ -100,6 +100,7 @@ struct dbc_ep {
 struct dbc_port {
 	struct tty_port			port;
 	spinlock_t			port_lock;	/* port access */
+	int				minor;
 
 	struct list_head		read_pool;
 	struct list_head		read_queue;
@@ -194,10 +195,17 @@ static inline struct dbc_ep *get_out_ep(struct xhci_dbc *dbc)
 }
 
 #ifdef CONFIG_USB_XHCI_DBGCAP
-int xhci_dbc_init(struct xhci_hcd *xhci);
-void xhci_dbc_exit(struct xhci_hcd *xhci);
-int xhci_dbc_tty_probe(struct xhci_hcd *xhci);
+int xhci_create_dbc_dev(struct xhci_hcd *xhci);
+void xhci_remove_dbc_dev(struct xhci_hcd *xhci);
+int xhci_dbc_init(void);
+void xhci_dbc_exit(void);
+int dbc_tty_init(void);
+void dbc_tty_exit(void);
+int xhci_dbc_tty_probe(struct device *dev, void __iomem *res, struct xhci_hcd *xhci);
 void xhci_dbc_tty_remove(struct xhci_dbc *dbc);
+struct xhci_dbc *xhci_alloc_dbc(struct device *dev, void __iomem *res,
+				 const struct dbc_driver *driver);
+void xhci_dbc_remove(struct xhci_dbc *dbc);
 struct dbc_request *dbc_alloc_request(struct xhci_dbc *dbc,
 				      unsigned int direction,
 				      gfp_t flags);
@@ -208,15 +216,21 @@ int xhci_dbc_suspend(struct xhci_hcd *xhci);
 int xhci_dbc_resume(struct xhci_hcd *xhci);
 #endif /* CONFIG_PM */
 #else
-static inline int xhci_dbc_init(struct xhci_hcd *xhci)
+static inline int xhci_create_dbc_dev(struct xhci_hcd *xhci)
 {
 	return 0;
 }
 
-static inline void xhci_dbc_exit(struct xhci_hcd *xhci)
+static inline void xhci_remove_dbc_dev(struct xhci_hcd *xhci)
+{
+}
+static inline int xhci_dbc_init(void)
+{
+	return 0;
+}
+static inline void xhci_dbc_exit(void)
 {
 }
-
 static inline int xhci_dbc_suspend(struct xhci_hcd *xhci)
 {
 	return 0;
diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c
index eb46e642e87a..d3acc0829ee5 100644
--- a/drivers/usb/host/xhci-dbgtty.c
+++ b/drivers/usb/host/xhci-dbgtty.c
@@ -10,14 +10,14 @@
 #include <linux/slab.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
+#include <linux/idr.h>
 
 #include "xhci.h"
 #include "xhci-dbgcap.h"
 
-static int dbc_tty_init(void);
-static void dbc_tty_exit(void);
-
 static struct tty_driver *dbc_tty_driver;
+static struct idr dbc_tty_minors;
+static DEFINE_MUTEX(dbc_tty_minors_lock);
 
 static inline struct dbc_port *dbc_to_port(struct xhci_dbc *dbc)
 {
@@ -180,7 +180,14 @@ xhci_dbc_free_requests(struct list_head *head)
 
 static int dbc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 {
-	struct dbc_port		*port = driver->driver_state;
+	struct dbc_port		*port;
+
+	mutex_lock(&dbc_tty_minors_lock);
+	port = idr_find(&dbc_tty_minors, tty->index);
+	mutex_unlock(&dbc_tty_minors_lock);
+
+	if (!port)
+		return -ENXIO;
 
 	tty->driver_data = port;
 
@@ -409,6 +416,15 @@ static int xhci_dbc_tty_register_device(struct xhci_dbc *dbc)
 
 	xhci_dbc_tty_init_port(dbc, port);
 
+	mutex_lock(&dbc_tty_minors_lock);
+	port->minor = idr_alloc(&dbc_tty_minors, port, 0, 64, GFP_KERNEL);
+	mutex_unlock(&dbc_tty_minors_lock);
+
+	if (port->minor < 0) {
+		ret = port->minor;
+		goto err_idr;
+	}
+
 	ret = kfifo_alloc(&port->write_fifo, DBC_WRITE_BUF_SIZE, GFP_KERNEL);
 	if (ret)
 		goto err_exit_port;
@@ -424,7 +440,7 @@ static int xhci_dbc_tty_register_device(struct xhci_dbc *dbc)
 		goto err_free_requests;
 
 	tty_dev = tty_port_register_device(&port->port,
-					   dbc_tty_driver, 0, NULL);
+					   dbc_tty_driver, port->minor, NULL);
 	if (IS_ERR(tty_dev)) {
 		ret = PTR_ERR(tty_dev);
 		goto err_free_requests;
@@ -440,6 +456,8 @@ err_free_requests:
 err_free_fifo:
 	kfifo_free(&port->write_fifo);
 err_exit_port:
+	idr_remove(&dbc_tty_minors, port->minor);
+err_idr:
 	xhci_dbc_tty_exit_port(port);
 
 	dev_err(dbc->dev, "can't register tty port, err %d\n", ret);
@@ -453,10 +471,14 @@ static void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
 
 	if (!port->registered)
 		return;
-	tty_unregister_device(dbc_tty_driver, 0);
+	tty_unregister_device(dbc_tty_driver, port->minor);
 	xhci_dbc_tty_exit_port(port);
 	port->registered = false;
 
+	mutex_lock(&dbc_tty_minors_lock);
+	idr_remove(&dbc_tty_minors, port->minor);
+	mutex_unlock(&dbc_tty_minors_lock);
+
 	kfifo_free(&port->write_fifo);
 	xhci_dbc_free_requests(&port->read_pool);
 	xhci_dbc_free_requests(&port->read_queue);
@@ -468,33 +490,35 @@ static const struct dbc_driver dbc_driver = {
 	.disconnect		= xhci_dbc_tty_unregister_device,
 };
 
-int xhci_dbc_tty_probe(struct xhci_hcd *xhci)
+int xhci_dbc_tty_probe(struct device *dev, void __iomem *base, struct xhci_hcd *xhci)
 {
-	struct xhci_dbc		*dbc = xhci->dbc;
+	struct xhci_dbc		*dbc;
 	struct dbc_port		*port;
 	int			status;
 
-	/* dbc_tty_init will be called by module init() in the future */
-	status = dbc_tty_init();
-	if (status)
-		return status;
+	if (!dbc_tty_driver)
+		return -ENODEV;
 
 	port = kzalloc(sizeof(*port), GFP_KERNEL);
-	if (!port) {
+	if (!port)
+		return -ENOMEM;
+
+	dbc = xhci_alloc_dbc(dev, base, &dbc_driver);
+
+	if (!dbc) {
 		status = -ENOMEM;
-		goto out;
+		goto out2;
 	}
 
-	dbc->driver = &dbc_driver;
 	dbc->priv = port;
 
-
-	dbc_tty_driver->driver_state = port;
+	/* get rid of xhci once this is a real driver binding to a device */
+	xhci->dbc = dbc;
 
 	return 0;
-out:
-	/* dbc_tty_exit will be called by module_exit() in the future */
-	dbc_tty_exit();
+out2:
+	kfree(port);
+
 	return status;
 }
 
@@ -506,22 +530,22 @@ void xhci_dbc_tty_remove(struct xhci_dbc *dbc)
 {
 	struct dbc_port         *port = dbc_to_port(dbc);
 
-	dbc->driver = NULL;
-	dbc->priv = NULL;
+	xhci_dbc_remove(dbc);
 	kfree(port);
-
-	/* dbc_tty_exit will be called by  module_exit() in the future */
-	dbc_tty_exit();
 }
 
-static int dbc_tty_init(void)
+int dbc_tty_init(void)
 {
 	int		ret;
 
-	dbc_tty_driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW |
+	idr_init(&dbc_tty_minors);
+
+	dbc_tty_driver = tty_alloc_driver(64, TTY_DRIVER_REAL_RAW |
 					  TTY_DRIVER_DYNAMIC_DEV);
-	if (IS_ERR(dbc_tty_driver))
+	if (IS_ERR(dbc_tty_driver)) {
+		idr_destroy(&dbc_tty_minors);
 		return PTR_ERR(dbc_tty_driver);
+	}
 
 	dbc_tty_driver->driver_name = "dbc_serial";
 	dbc_tty_driver->name = "ttyDBC";
@@ -540,15 +564,19 @@ static int dbc_tty_init(void)
 	if (ret) {
 		pr_err("Can't register dbc tty driver\n");
 		tty_driver_kref_put(dbc_tty_driver);
+		idr_destroy(&dbc_tty_minors);
 	}
+
 	return ret;
 }
 
-static void dbc_tty_exit(void)
+void dbc_tty_exit(void)
 {
 	if (dbc_tty_driver) {
 		tty_unregister_driver(dbc_tty_driver);
 		tty_driver_kref_put(dbc_tty_driver);
 		dbc_tty_driver = NULL;
 	}
+
+	idr_destroy(&dbc_tty_minors);
 }
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index df3522dab31b..1e7dc130c39a 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -762,7 +762,7 @@ static int xhci_exit_test_mode(struct xhci_hcd *xhci)
 	}
 	pm_runtime_allow(xhci_to_hcd(xhci)->self.controller);
 	xhci->test_mode = 0;
-	return xhci_reset(xhci);
+	return xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 }
 
 void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,
@@ -1088,6 +1088,9 @@ static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
 		if (link_state == XDEV_U2)
 			*status |= USB_PORT_STAT_L1;
 		if (link_state == XDEV_U0) {
+			if (bus_state->resume_done[portnum])
+				usb_hcd_end_port_resume(&port->rhub->hcd->self,
+							portnum);
 			bus_state->resume_done[portnum] = 0;
 			clear_bit(portnum, &bus_state->resuming_ports);
 			if (bus_state->suspended_ports & (1 << portnum)) {
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 0e312066c5c6..bbb27ee2c6a3 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -57,7 +57,7 @@ static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci,
 	/* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */
 	if (cycle_state == 0) {
 		for (i = 0; i < TRBS_PER_SEGMENT; i++)
-			seg->trbs[i].link.control |= cpu_to_le32(TRB_CYCLE);
+			seg->trbs[i].link.control = cpu_to_le32(TRB_CYCLE);
 	}
 	seg->dma = dma;
 	seg->next = NULL;
@@ -433,8 +433,7 @@ int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
 				(TRBS_PER_SEGMENT - 1);
 
 	/* Allocate number of segments we needed, or double the ring size */
-	num_segs = ring->num_segs > num_segs_needed ?
-			ring->num_segs : num_segs_needed;
+	num_segs = max(ring->num_segs, num_segs_needed);
 
 	ret = xhci_alloc_segments_for_ring(xhci, &first, &last,
 			num_segs, ring->cycle_state, ring->type,
@@ -1846,9 +1845,6 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
 	xhci->event_ring = NULL;
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed event ring");
 
-	if (xhci->lpm_command)
-		xhci_free_command(xhci, xhci->lpm_command);
-	xhci->lpm_command = NULL;
 	if (xhci->cmd_ring)
 		xhci_ring_free(xhci, xhci->cmd_ring);
 	xhci->cmd_ring = NULL;
@@ -2395,11 +2391,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 	page_size = readl(&xhci->op_regs->page_size);
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 			"Supported page size register = 0x%x", page_size);
-	for (i = 0; i < 16; i++) {
-		if ((0x1 & page_size) != 0)
-			break;
-		page_size = page_size >> 1;
-	}
+	i = ffs(page_size);
 	if (i < 16)
 		xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 			"Supported page size of %iK", (1 << (i+12)) / 1024);
@@ -2425,7 +2417,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 	writel(val, &xhci->op_regs->config_reg);
 
 	/*
-	 * xHCI section 5.4.6 - doorbell array must be
+	 * xHCI section 5.4.6 - Device Context array must be
 	 * "physically contiguous and 64-byte (cache line) aligned".
 	 */
 	xhci->dcbaa = dma_alloc_coherent(dev, sizeof(*xhci->dcbaa), &dma,
@@ -2488,10 +2480,6 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 			"// Setting command ring address to 0x%016llx", val_64);
 	xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
 
-	xhci->lpm_command = xhci_alloc_command_with_ctx(xhci, true, flags);
-	if (!xhci->lpm_command)
-		goto fail;
-
 	/* Reserve one command ring TRB for disabling LPM.
 	 * Since the USB core grabs the shared usb_bus bandwidth mutex before
 	 * disabling LPM, we only need to reserve one TRB for all devices.
@@ -2583,7 +2571,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 
 fail:
 	xhci_halt(xhci);
-	xhci_reset(xhci);
+	xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 	xhci_mem_cleanup(xhci);
 	return -ENOMEM;
 }
diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index edbfa82c6565..f3139ce7b0a9 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -248,7 +248,6 @@ create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
 	struct mu3h_sch_bw_info *bw_info;
 	struct mu3h_sch_tt *tt = NULL;
 	u32 len_bw_budget_table;
-	size_t mem_size;
 
 	bw_info = get_bw_info(mtk, udev, ep);
 	if (!bw_info)
@@ -262,9 +261,9 @@ create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
 	else
 		len_bw_budget_table = 1;
 
-	mem_size = sizeof(struct mu3h_sch_ep_info) +
-			len_bw_budget_table * sizeof(u32);
-	sch_ep = kzalloc(mem_size, GFP_KERNEL);
+	sch_ep = kzalloc(struct_size(sch_ep, bw_budget_table,
+				     len_bw_budget_table),
+			 GFP_KERNEL);
 	if (!sch_ep)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 91738af0ab14..b1045f534a4b 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -95,6 +95,19 @@
 #define WC0_SSUSB0_CDEN		BIT(6)
 #define WC0_IS_SPM_EN		BIT(1)
 
+/* mt8195 */
+#define PERI_WK_CTRL0_8195	0x04
+#define WC0_IS_P_95		BIT(30)	/* polarity */
+#define WC0_IS_C_95(x)		((u32)(((x) & 0x7) << 27))
+#define WC0_IS_EN_P3_95		BIT(26)
+#define WC0_IS_EN_P2_95		BIT(25)
+#define WC0_IS_EN_P1_95		BIT(24)
+
+#define PERI_WK_CTRL1_8195	0x20
+#define WC1_IS_C_95(x)		((u32)(((x) & 0xf) << 28))
+#define WC1_IS_P_95		BIT(12)
+#define WC1_IS_EN_P0_95		BIT(6)
+
 /* mt2712 etc */
 #define PERI_SSUSB_SPM_CTRL	0x0
 #define SSC_IP_SLEEP_EN	BIT(4)
@@ -105,6 +118,10 @@ enum ssusb_uwk_vers {
 	SSUSB_UWK_V2,
 	SSUSB_UWK_V1_1 = 101,	/* specific revision 1.01 */
 	SSUSB_UWK_V1_2,		/* specific revision 1.2 */
+	SSUSB_UWK_V1_3,		/* mt8195 IP0 */
+	SSUSB_UWK_V1_4,		/* mt8195 IP1 */
+	SSUSB_UWK_V1_5,		/* mt8195 IP2 */
+	SSUSB_UWK_V1_6,		/* mt8195 IP3 */
 };
 
 /*
@@ -308,6 +325,26 @@ static void usb_wakeup_ip_sleep_set(struct xhci_hcd_mtk *mtk, bool enable)
 		msk = WC0_SSUSB0_CDEN | WC0_IS_SPM_EN;
 		val = enable ? msk : 0;
 		break;
+	case SSUSB_UWK_V1_3:
+		reg = mtk->uwk_reg_base + PERI_WK_CTRL1_8195;
+		msk = WC1_IS_EN_P0_95 | WC1_IS_C_95(0xf) | WC1_IS_P_95;
+		val = enable ? (WC1_IS_EN_P0_95 | WC1_IS_C_95(0x1)) : 0;
+		break;
+	case SSUSB_UWK_V1_4:
+		reg = mtk->uwk_reg_base + PERI_WK_CTRL0_8195;
+		msk = WC0_IS_EN_P1_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95;
+		val = enable ? (WC0_IS_EN_P1_95 | WC0_IS_C_95(0x1)) : 0;
+		break;
+	case SSUSB_UWK_V1_5:
+		reg = mtk->uwk_reg_base + PERI_WK_CTRL0_8195;
+		msk = WC0_IS_EN_P2_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95;
+		val = enable ? (WC0_IS_EN_P2_95 | WC0_IS_C_95(0x1)) : 0;
+		break;
+	case SSUSB_UWK_V1_6:
+		reg = mtk->uwk_reg_base + PERI_WK_CTRL0_8195;
+		msk = WC0_IS_EN_P3_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95;
+		val = enable ? (WC0_IS_EN_P3_95 | WC0_IS_C_95(0x1)) : 0;
+		break;
 	case SSUSB_UWK_V2:
 		reg = mtk->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
 		msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;
@@ -364,29 +401,14 @@ static int xhci_mtk_clks_get(struct xhci_hcd_mtk *mtk)
 	return devm_clk_bulk_get_optional(mtk->dev, BULK_CLKS_NUM, clks);
 }
 
-static int xhci_mtk_ldos_enable(struct xhci_hcd_mtk *mtk)
+static int xhci_mtk_vregs_get(struct xhci_hcd_mtk *mtk)
 {
-	int ret;
+	struct regulator_bulk_data *supplies = mtk->supplies;
 
-	ret = regulator_enable(mtk->vbus);
-	if (ret) {
-		dev_err(mtk->dev, "failed to enable vbus\n");
-		return ret;
-	}
+	supplies[0].supply = "vbus";
+	supplies[1].supply = "vusb33";
 
-	ret = regulator_enable(mtk->vusb33);
-	if (ret) {
-		dev_err(mtk->dev, "failed to enable vusb33\n");
-		regulator_disable(mtk->vbus);
-		return ret;
-	}
-	return 0;
-}
-
-static void xhci_mtk_ldos_disable(struct xhci_hcd_mtk *mtk)
-{
-	regulator_disable(mtk->vbus);
-	regulator_disable(mtk->vusb33);
+	return devm_regulator_bulk_get(mtk->dev, BULK_VREGS_NUM, supplies);
 }
 
 static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
@@ -476,17 +498,10 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	mtk->dev = dev;
-	mtk->vbus = devm_regulator_get(dev, "vbus");
-	if (IS_ERR(mtk->vbus)) {
-		dev_err(dev, "fail to get vbus\n");
-		return PTR_ERR(mtk->vbus);
-	}
 
-	mtk->vusb33 = devm_regulator_get(dev, "vusb33");
-	if (IS_ERR(mtk->vusb33)) {
-		dev_err(dev, "fail to get vusb33\n");
-		return PTR_ERR(mtk->vusb33);
-	}
+	ret = xhci_mtk_vregs_get(mtk);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
 
 	ret = xhci_mtk_clks_get(mtk);
 	if (ret)
@@ -527,7 +542,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
 
-	ret = xhci_mtk_ldos_enable(mtk);
+	ret = regulator_bulk_enable(BULK_VREGS_NUM, mtk->supplies);
 	if (ret)
 		goto disable_pm;
 
@@ -636,7 +651,7 @@ disable_clk:
 	clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
 
 disable_ldos:
-	xhci_mtk_ldos_disable(mtk);
+	regulator_bulk_disable(BULK_VREGS_NUM, mtk->supplies);
 
 disable_pm:
 	pm_runtime_put_noidle(dev);
@@ -664,7 +679,7 @@ static int xhci_mtk_remove(struct platform_device *pdev)
 	usb_put_hcd(hcd);
 	xhci_mtk_sch_exit(mtk);
 	clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
-	xhci_mtk_ldos_disable(mtk);
+	regulator_bulk_disable(BULK_VREGS_NUM, mtk->supplies);
 
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
index 4b1ea89f959a..ffd4b493b4ba 100644
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -11,10 +11,12 @@
 
 #include <linux/clk.h>
 #include <linux/hashtable.h>
+#include <linux/regulator/consumer.h>
 
 #include "xhci.h"
 
 #define BULK_CLKS_NUM	5
+#define BULK_VREGS_NUM	2
 
 /* support at most 64 ep, use 32 size hash table */
 #define SCH_EP_HASH_BITS	5
@@ -150,9 +152,8 @@ struct xhci_hcd_mtk {
 	int num_u3_ports;
 	int u2p_dis_msk;
 	int u3p_dis_msk;
-	struct regulator *vusb33;
-	struct regulator *vbus;
 	struct clk_bulk_data clks[BULK_CLKS_NUM];
+	struct regulator_bulk_data supplies[BULK_VREGS_NUM];
 	unsigned int has_ippc:1;
 	unsigned int lpm_support:1;
 	unsigned int u2_lpm_disable:1;
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index dc570ce4e831..8094da34825e 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -226,20 +226,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (!sysdev)
 		sysdev = &pdev->dev;
 
-	/* Try to set 64-bit DMA first */
 	if (WARN_ON(!sysdev->dma_mask))
 		/* Platform did not initialize dma_mask */
-		ret = dma_coerce_mask_and_coherent(sysdev,
-						   DMA_BIT_MASK(64));
+		ret = dma_coerce_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
 	else
 		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
-
-	/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
-	if (ret) {
-		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(32));
-		if (ret)
-			return ret;
-	}
+	if (ret)
+		return ret;
 
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index 9888ba7d85b6..aef0258a7160 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -82,7 +82,7 @@ static const struct soc_device_attribute rcar_quirks_match[]  = {
 		.soc_id = "r8a7795", .revision = "ES1.*",
 		.data = (void *)RCAR_XHCI_FIRMWARE_V2,
 	},
-	{ /* sentinel */ },
+	{ /* sentinel */ }
 };
 
 static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 2d378543bc3a..642610c78f58 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -65,7 +65,7 @@ static bool td_on_ring(struct xhci_td *td, struct xhci_ring *ring)
  * handshake done).  There are two failure modes:  "usec" have passed (major
  * hardware flakeout), or the register reads as all-ones (hardware removed).
  */
-int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
+int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, u64 timeout_us)
 {
 	u32	result;
 	int	ret;
@@ -73,7 +73,7 @@ int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
 	ret = readl_poll_timeout_atomic(ptr, result,
 					(result & mask) == done ||
 					result == U32_MAX,
-					1, usec);
+					1, timeout_us);
 	if (result == U32_MAX)		/* card removed */
 		return -ENODEV;
 
@@ -110,6 +110,7 @@ void xhci_quiesce(struct xhci_hcd *xhci)
 int xhci_halt(struct xhci_hcd *xhci)
 {
 	int ret;
+
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Halt the HC");
 	xhci_quiesce(xhci);
 
@@ -119,8 +120,10 @@ int xhci_halt(struct xhci_hcd *xhci)
 		xhci_warn(xhci, "Host halt failed, %d\n", ret);
 		return ret;
 	}
+
 	xhci->xhc_state |= XHCI_STATE_HALTED;
 	xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
+
 	return ret;
 }
 
@@ -162,7 +165,7 @@ int xhci_start(struct xhci_hcd *xhci)
  * Transactions will be terminated immediately, and operational registers
  * will be set to their defaults.
  */
-int xhci_reset(struct xhci_hcd *xhci)
+int xhci_reset(struct xhci_hcd *xhci, u64 timeout_us)
 {
 	u32 command;
 	u32 state;
@@ -195,8 +198,7 @@ int xhci_reset(struct xhci_hcd *xhci)
 	if (xhci->quirks & XHCI_INTEL_HOST)
 		udelay(1000);
 
-	ret = xhci_handshake(&xhci->op_regs->command,
-			CMD_RESET, 0, 10 * 1000 * 1000);
+	ret = xhci_handshake(&xhci->op_regs->command, CMD_RESET, 0, timeout_us);
 	if (ret)
 		return ret;
 
@@ -209,8 +211,7 @@ int xhci_reset(struct xhci_hcd *xhci)
 	 * xHCI cannot write to any doorbells or operational registers other
 	 * than status until the "Controller Not Ready" flag is cleared.
 	 */
-	ret = xhci_handshake(&xhci->op_regs->status,
-			STS_CNR, 0, 10 * 1000 * 1000);
+	ret = xhci_handshake(&xhci->op_regs->status, STS_CNR, 0, timeout_us);
 
 	xhci->usb2_rhub.bus_state.port_c_suspend = 0;
 	xhci->usb2_rhub.bus_state.suspended_ports = 0;
@@ -324,7 +325,7 @@ static int xhci_setup_msi(struct xhci_hcd *xhci)
  */
 static int xhci_setup_msix(struct xhci_hcd *xhci)
 {
-	int i, ret = 0;
+	int i, ret;
 	struct usb_hcd *hcd = xhci_to_hcd(xhci);
 	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
 
@@ -578,7 +579,7 @@ static int xhci_all_ports_seen_u0(struct xhci_hcd *xhci)
 static int xhci_init(struct usb_hcd *hcd)
 {
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
-	int retval = 0;
+	int retval;
 
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "xhci_init");
 	spin_lock_init(&xhci->lock);
@@ -695,7 +696,7 @@ int xhci_run(struct usb_hcd *hcd)
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 			"Finished xhci_run for USB2 roothub");
 
-	xhci_dbc_init(xhci);
+	xhci_create_dbc_dev(xhci);
 
 	xhci_debugfs_init(xhci);
 
@@ -725,13 +726,13 @@ static void xhci_stop(struct usb_hcd *hcd)
 		return;
 	}
 
-	xhci_dbc_exit(xhci);
+	xhci_remove_dbc_dev(xhci);
 
 	spin_lock_irq(&xhci->lock);
 	xhci->xhc_state |= XHCI_STATE_HALTED;
 	xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
 	xhci_halt(xhci);
-	xhci_reset(xhci);
+	xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 	spin_unlock_irq(&xhci->lock);
 
 	xhci_cleanup_msix(xhci);
@@ -784,7 +785,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
 	xhci_halt(xhci);
 	/* Workaround for spurious wakeups at shutdown with HSW */
 	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
-		xhci_reset(xhci);
+		xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 	spin_unlock_irq(&xhci->lock);
 
 	xhci_cleanup_msix(xhci);
@@ -1170,7 +1171,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 		xhci_dbg(xhci, "Stop HCD\n");
 		xhci_halt(xhci);
 		xhci_zero_64b_regs(xhci);
-		retval = xhci_reset(xhci);
+		retval = xhci_reset(xhci, XHCI_RESET_LONG_USEC);
 		spin_unlock_irq(&xhci->lock);
 		if (retval)
 			return retval;
@@ -3160,8 +3161,6 @@ rescan:
 
 	ep_index = xhci_get_endpoint_index(&host_ep->desc);
 	ep = &vdev->eps[ep_index];
-	if (!ep)
-		goto done;
 
 	/* wait for hub_tt_work to finish clearing hub TT */
 	if (ep->ep_state & EP_CLEARING_TT) {
@@ -3219,8 +3218,6 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
 		return;
 	ep_index = xhci_get_endpoint_index(&host_ep->desc);
 	ep = &vdev->eps[ep_index];
-	if (!ep)
-		return;
 
 	/* Bail out if toggle is already being cleared by a endpoint reset */
 	spin_lock_irqsave(&xhci->lock, flags);
@@ -3978,7 +3975,7 @@ int xhci_disable_slot(struct xhci_hcd *xhci, u32 slot_id)
 	struct xhci_command *command;
 	unsigned long flags;
 	u32 state;
-	int ret = 0;
+	int ret;
 
 	command = xhci_alloc_command(xhci, true, GFP_KERNEL);
 	if (!command)
@@ -4014,7 +4011,7 @@ int xhci_disable_slot(struct xhci_hcd *xhci, u32 slot_id)
 
 	xhci_free_command(xhci, command);
 
-	return ret;
+	return 0;
 }
 
 /*
@@ -4354,6 +4351,10 @@ static int __maybe_unused xhci_change_max_exit_latency(struct xhci_hcd *xhci,
 	unsigned long flags;
 	int ret;
 
+	command = xhci_alloc_command_with_ctx(xhci, true, GFP_KERNEL);
+	if (!command)
+		return -ENOMEM;
+
 	spin_lock_irqsave(&xhci->lock, flags);
 
 	virt_dev = xhci->devs[udev->slot_id];
@@ -4370,10 +4371,10 @@ static int __maybe_unused xhci_change_max_exit_latency(struct xhci_hcd *xhci,
 	}
 
 	/* Attempt to issue an Evaluate Context command to change the MEL. */
-	command = xhci->lpm_command;
 	ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx);
 	if (!ctrl_ctx) {
 		spin_unlock_irqrestore(&xhci->lock, flags);
+		xhci_free_command(xhci, command);
 		xhci_warn(xhci, "%s: Could not get input context, bad type.\n",
 				__func__);
 		return -ENOMEM;
@@ -4400,6 +4401,9 @@ static int __maybe_unused xhci_change_max_exit_latency(struct xhci_hcd *xhci,
 		virt_dev->current_mel = max_exit_latency;
 		spin_unlock_irqrestore(&xhci->lock, flags);
 	}
+
+	xhci_free_command(xhci, command);
+
 	return ret;
 }
 
@@ -4520,18 +4524,8 @@ static int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
 			exit_latency = xhci_besl_encoding[hird];
 			spin_unlock_irqrestore(&xhci->lock, flags);
 
-			/* USB 3.0 code dedicate one xhci->lpm_command->in_ctx
-			 * input context for link powermanagement evaluate
-			 * context commands. It is protected by hcd->bandwidth
-			 * mutex and is shared by all devices. We need to set
-			 * the max ext latency in USB 2 BESL LPM as well, so
-			 * use the same mutex and xhci_change_max_exit_latency()
-			 */
-			mutex_lock(hcd->bandwidth_mutex);
 			ret = xhci_change_max_exit_latency(xhci, udev,
 							   exit_latency);
-			mutex_unlock(hcd->bandwidth_mutex);
-
 			if (ret < 0)
 				return ret;
 			spin_lock_irqsave(&xhci->lock, flags);
@@ -4559,9 +4553,7 @@ static int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
 		readl(pm_addr);
 		if (udev->usb2_hw_lpm_besl_capable) {
 			spin_unlock_irqrestore(&xhci->lock, flags);
-			mutex_lock(hcd->bandwidth_mutex);
 			xhci_change_max_exit_latency(xhci, udev, 0);
-			mutex_unlock(hcd->bandwidth_mutex);
 			readl_poll_timeout(ports[port_num]->addr, pm_val,
 					   (pm_val & PORT_PLS_MASK) == XDEV_U0,
 					   100, 10000);
@@ -5290,8 +5282,7 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
 	xhci->hcs_params1 = readl(&xhci->cap_regs->hcs_params1);
 	xhci->hcs_params2 = readl(&xhci->cap_regs->hcs_params2);
 	xhci->hcs_params3 = readl(&xhci->cap_regs->hcs_params3);
-	xhci->hcc_params = readl(&xhci->cap_regs->hc_capbase);
-	xhci->hci_version = HC_VERSION(xhci->hcc_params);
+	xhci->hci_version = HC_VERSION(readl(&xhci->cap_regs->hc_capbase));
 	xhci->hcc_params = readl(&xhci->cap_regs->hcc_params);
 	if (xhci->hci_version > 0x100)
 		xhci->hcc_params2 = readl(&xhci->cap_regs->hcc_params2);
@@ -5316,7 +5307,7 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
 
 	xhci_dbg(xhci, "Resetting HCD\n");
 	/* Reset the internal HC memory state and registers. */
-	retval = xhci_reset(xhci);
+	retval = xhci_reset(xhci, XHCI_RESET_LONG_USEC);
 	if (retval)
 		return retval;
 	xhci_dbg(xhci, "Reset complete\n");
@@ -5505,6 +5496,7 @@ static int __init xhci_hcd_init(void)
 		return -ENODEV;
 
 	xhci_debugfs_create_root();
+	xhci_dbc_init();
 
 	return 0;
 }
@@ -5516,6 +5508,7 @@ static int __init xhci_hcd_init(void)
 static void __exit xhci_hcd_fini(void)
 {
 	xhci_debugfs_remove_root();
+	xhci_dbc_exit();
 }
 
 module_init(xhci_hcd_init);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 5a75fe563123..473a33ce299e 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -229,6 +229,9 @@ struct xhci_op_regs {
 #define CMD_ETE		(1 << 14)
 /* bits 15:31 are reserved (and should be preserved on writes). */
 
+#define XHCI_RESET_LONG_USEC		(10 * 1000 * 1000)
+#define XHCI_RESET_SHORT_USEC		(250 * 1000)
+
 /* IMAN - Interrupt Management Register */
 #define IMAN_IE		(1 << 1)
 #define IMAN_IP		(1 << 0)
@@ -1812,8 +1815,6 @@ struct xhci_hcd {
 	/* slot enabling and address device helpers */
 	/* these are not thread safe so use mutex */
 	struct mutex mutex;
-	/* For USB 3.0 LPM enable/disable. */
-	struct xhci_command		*lpm_command;
 	/* Internal mirror of the HW's dcbaa */
 	struct xhci_virt_device	*devs[MAX_HC_SLOTS];
 	/* For keeping track of bandwidth domains per roothub. */
@@ -2083,11 +2084,11 @@ void xhci_free_container_ctx(struct xhci_hcd *xhci,
 
 /* xHCI host controller glue */
 typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);
-int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec);
+int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, u64 timeout_us);
 void xhci_quiesce(struct xhci_hcd *xhci);
 int xhci_halt(struct xhci_hcd *xhci);
 int xhci_start(struct xhci_hcd *xhci);
-int xhci_reset(struct xhci_hcd *xhci);
+int xhci_reset(struct xhci_hcd *xhci, u64 timeout_us);
 int xhci_run(struct usb_hcd *hcd);
 int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);
 void xhci_shutdown(struct usb_hcd *hcd);
@@ -2467,6 +2468,8 @@ static inline const char *xhci_decode_ctrl_ctx(char *str,
 	unsigned int	bit;
 	int		ret = 0;
 
+	str[0] = '\0';
+
 	if (drop) {
 		ret = sprintf(str, "Drop:");
 		for_each_set_bit(bit, &drop, 32)
@@ -2624,8 +2627,11 @@ static inline const char *xhci_decode_usbsts(char *str, u32 usbsts)
 {
 	int ret = 0;
 
+	ret = sprintf(str, " 0x%08x", usbsts);
+
 	if (usbsts == ~(u32)0)
-		return " 0xffffffff";
+		return str;
+
 	if (usbsts & STS_HALT)
 		ret += sprintf(str + ret, " HCHalted");
 	if (usbsts & STS_FATAL)