diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 5ce839137ad6..0f857e645058 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -444,7 +444,7 @@ static void hub_irq(struct urb *urb)
 static inline int
 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
 {
-	return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 			       HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
 			       tt, NULL, 0, 1000);
 }
diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index d5b65962dd36..731150d4b1d9 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -1213,7 +1213,12 @@ udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
 				tmp &= AMD_UNMASK_BIT(ep->num);
 				writel(tmp, &dev->regs->ep_irqmsk);
 			}
-		}
+		} else if (ep->in) {
+				/* enable ep irq */
+				tmp = readl(&dev->regs->ep_irqmsk);
+				tmp &= AMD_UNMASK_BIT(ep->num);
+				writel(tmp, &dev->regs->ep_irqmsk);
+			}
 
 	} else if (ep->dma) {
 
@@ -2005,18 +2010,17 @@ __acquires(dev->lock)
 {
 	int tmp;
 
-	/* empty queues and init hardware */
-	udc_basic_init(dev);
-	for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
-		empty_req_queue(&dev->ep[tmp]);
-	}
-
 	if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
 		spin_unlock(&dev->lock);
 		driver->disconnect(&dev->gadget);
 		spin_lock(&dev->lock);
 	}
-	/* init */
+
+	/* empty queues and init hardware */
+	udc_basic_init(dev);
+	for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
+		empty_req_queue(&dev->ep[tmp]);
+
 	udc_setup_endpoints(dev);
 }
 
@@ -2472,6 +2476,13 @@ static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
 				}
 			}
 
+		} else if (!use_dma && ep->in) {
+			/* disable interrupt */
+			tmp = readl(
+				&dev->regs->ep_irqmsk);
+			tmp |= AMD_BIT(ep->num);
+			writel(tmp,
+				&dev->regs->ep_irqmsk);
 		}
 	}
 	/* clear status bits */
@@ -3279,6 +3290,17 @@ static int udc_pci_probe(
 		goto finished;
 	}
 
+	spin_lock_init(&dev->lock);
+	/* udc csr registers base */
+	dev->csr = dev->virt_addr + UDC_CSR_ADDR;
+	/* dev registers base */
+	dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
+	/* ep registers base */
+	dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
+	/* fifo's base */
+	dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
+	dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
+
 	if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
 		dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
 		kfree(dev);
@@ -3331,7 +3353,6 @@ static int udc_probe(struct udc *dev)
 	udc_pollstall_timer.data = 0;
 
 	/* device struct setup */
-	spin_lock_init(&dev->lock);
 	dev->gadget.ops = &udc_ops;
 
 	dev_set_name(&dev->gadget.dev, "gadget");
@@ -3340,16 +3361,6 @@ static int udc_probe(struct udc *dev)
 	dev->gadget.name = name;
 	dev->gadget.is_dualspeed = 1;
 
-	/* udc csr registers base */
-	dev->csr = dev->virt_addr + UDC_CSR_ADDR;
-	/* dev registers base */
-	dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
-	/* ep registers base */
-	dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
-	/* fifo's base */
-	dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
-	dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
-
 	/* init registers, interrupts, ... */
 	startup_registers(dev);
 
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 9835e0713943..f5f5601701c9 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -28,6 +28,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/timer.h>
+#include <linux/ktime.h>
 #include <linux/list.h>
 #include <linux/interrupt.h>
 #include <linux/usb.h>
@@ -676,6 +677,7 @@ static int ehci_run (struct usb_hcd *hcd)
 	ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
 	msleep(5);
 	up_write(&ehci_cf_port_reset_rwsem);
+	ehci->last_periodic_enable = ktime_get_real();
 
 	temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
 	ehci_info (ehci,
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 378861b9d79a..ead5f4f2aa5a 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -111,6 +111,10 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
 	switch (pdev->vendor) {
 	case PCI_VENDOR_ID_INTEL:
 		ehci->need_io_watchdog = 0;
+		if (pdev->device == 0x27cc) {
+			ehci->broken_periodic = 1;
+			ehci_info(ehci, "using broken periodic workaround\n");
+		}
 		break;
 	case PCI_VENDOR_ID_TDI:
 		if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 00ad9ce392ed..139a2cc3f641 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -487,8 +487,20 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
 			 * we must clear the TT buffer (11.17.5).
 			 */
 			if (unlikely(last_status != -EINPROGRESS &&
-					last_status != -EREMOTEIO))
-				ehci_clear_tt_buffer(ehci, qh, urb, token);
+					last_status != -EREMOTEIO)) {
+				/* The TT's in some hubs malfunction when they
+				 * receive this request following a STALL (they
+				 * stop sending isochronous packets).  Since a
+				 * STALL can't leave the TT buffer in a busy
+				 * state (if you believe Figures 11-48 - 11-51
+				 * in the USB 2.0 spec), we won't clear the TT
+				 * buffer in this case.  Strictly speaking this
+				 * is a violation of the spec.
+				 */
+				if (last_status != -EPIPE)
+					ehci_clear_tt_buffer(ehci, qh, urb,
+							token);
+			}
 		}
 
 		/* if we're removing something not at the queue head,
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index b25cdea93a1f..a5535b5e3fe2 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -475,6 +475,8 @@ static int enable_periodic (struct ehci_hcd *ehci)
 	/* make sure ehci_work scans these */
 	ehci->next_uframe = ehci_readl(ehci, &ehci->regs->frame_index)
 		% (ehci->periodic_size << 3);
+	if (unlikely(ehci->broken_periodic))
+		ehci->last_periodic_enable = ktime_get_real();
 	return 0;
 }
 
@@ -486,6 +488,16 @@ static int disable_periodic (struct ehci_hcd *ehci)
 	if (--ehci->periodic_sched)
 		return 0;
 
+	if (unlikely(ehci->broken_periodic)) {
+		/* delay experimentally determined */
+		ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
+		ktime_t now = ktime_get_real();
+		s64 delay = ktime_us_delta(safe, now);
+
+		if (unlikely(delay > 0))
+			udelay(delay);
+	}
+
 	/* did setting PSE not take effect yet?
 	 * takes effect only at frame boundaries...
 	 */
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 064e76821ff5..2d85e21ff282 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -118,6 +118,7 @@ struct ehci_hcd {			/* one per controller */
 	unsigned		stamp;
 	unsigned		random_frame;
 	unsigned long		next_statechange;
+	ktime_t			last_periodic_enable;
 	u32			command;
 
 	/* SILICON QUIRKS */
@@ -127,6 +128,7 @@ struct ehci_hcd {			/* one per controller */
 	unsigned		big_endian_desc:1;
 	unsigned		has_amcc_usb23:1;
 	unsigned		need_io_watchdog:1;
+	unsigned		broken_periodic:1;
 
 	/* required for usb32 quirk */
 	#define OHCI_CTRL_HCFS          (3 << 6)
diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index c3577bbbae6c..ef2332a9941d 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -1442,11 +1442,6 @@ static int cppi_channel_abort(struct dma_channel *channel)
 		musb_writew(regs, MUSB_TXCSR, value);
 		musb_writew(regs, MUSB_TXCSR, value);
 
-		/* re-enable interrupt */
-		if (enabled)
-			musb_writel(tibase, DAVINCI_TXCPPI_INTENAB_REG,
-					(1 << cppi_ch->index));
-
 		/* While we scrub the TX state RAM, ensure that we clean
 		 * up any interrupt that's currently asserted:
 		 * 1. Write to completion Ptr value 0x1(bit 0 set)
@@ -1459,6 +1454,11 @@ static int cppi_channel_abort(struct dma_channel *channel)
 		cppi_reset_tx(tx_ram, 1);
 		musb_writel(&tx_ram->tx_complete, 0, 0);
 
+		/* re-enable interrupt */
+		if (enabled)
+			musb_writel(tibase, DAVINCI_TXCPPI_INTENAB_REG,
+					(1 << cppi_ch->index));
+
 		cppi_dump_tx(5, cppi_ch, " (done teardown)");
 
 		/* REVISIT tx side _should_ clean up the same way
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 3a61ddb62bd2..547e0e390726 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1450,7 +1450,7 @@ static int __init musb_core_init(u16 musb_type, struct musb *musb)
 #endif
 
 		if (hw_ep->max_packet_sz_tx) {
-			printk(KERN_DEBUG
+			DBG(1,
 				"%s: hw_ep %d%s, %smax %d\n",
 				musb_driver_name, i,
 				hw_ep->is_shared_fifo ? "shared" : "tx",
@@ -1459,7 +1459,7 @@ static int __init musb_core_init(u16 musb_type, struct musb *musb)
 				hw_ep->max_packet_sz_tx);
 		}
 		if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
-			printk(KERN_DEBUG
+			DBG(1,
 				"%s: hw_ep %d%s, %smax %d\n",
 				musb_driver_name, i,
 				"rx",
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 8b3c4e2ed7b8..74073f9a43f0 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -4,6 +4,7 @@
  * Copyright 2005 Mentor Graphics Corporation
  * Copyright (C) 2005-2006 by Texas Instruments
  * Copyright (C) 2006-2007 Nokia Corporation
+ * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -436,14 +437,6 @@ void musb_g_tx(struct musb *musb, u8 epnum)
 			csr |= MUSB_TXCSR_P_WZC_BITS;
 			csr &= ~MUSB_TXCSR_P_SENTSTALL;
 			musb_writew(epio, MUSB_TXCSR, csr);
-			if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
-				dma->status = MUSB_DMA_STATUS_CORE_ABORT;
-				musb->dma_controller->channel_abort(dma);
-			}
-
-			if (request)
-				musb_g_giveback(musb_ep, request, -EPIPE);
-
 			break;
 		}
 
@@ -582,15 +575,25 @@ void musb_g_tx(struct musb *musb, u8 epnum)
  */
 static void rxstate(struct musb *musb, struct musb_request *req)
 {
-	u16			csr = 0;
 	const u8		epnum = req->epnum;
 	struct usb_request	*request = &req->request;
 	struct musb_ep		*musb_ep = &musb->endpoints[epnum].ep_out;
 	void __iomem		*epio = musb->endpoints[epnum].regs;
 	unsigned		fifo_count = 0;
 	u16			len = musb_ep->packet_sz;
+	u16			csr = musb_readw(epio, MUSB_RXCSR);
 
-	csr = musb_readw(epio, MUSB_RXCSR);
+	/* We shouldn't get here while DMA is active, but we do... */
+	if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
+		DBG(4, "DMA pending...\n");
+		return;
+	}
+
+	if (csr & MUSB_RXCSR_P_SENDSTALL) {
+		DBG(5, "%s stalling, RXCSR %04x\n",
+		    musb_ep->end_point.name, csr);
+		return;
+	}
 
 	if (is_cppi_enabled() && musb_ep->dma) {
 		struct dma_controller	*c = musb->dma_controller;
@@ -761,19 +764,10 @@ void musb_g_rx(struct musb *musb, u8 epnum)
 			csr, dma ? " (dma)" : "", request);
 
 	if (csr & MUSB_RXCSR_P_SENTSTALL) {
-		if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
-			dma->status = MUSB_DMA_STATUS_CORE_ABORT;
-			(void) musb->dma_controller->channel_abort(dma);
-			request->actual += musb_ep->dma->actual_len;
-		}
-
 		csr |= MUSB_RXCSR_P_WZC_BITS;
 		csr &= ~MUSB_RXCSR_P_SENTSTALL;
 		musb_writew(epio, MUSB_RXCSR, csr);
-
-		if (request)
-			musb_g_giveback(musb_ep, request, -EPIPE);
-		goto done;
+		return;
 	}
 
 	if (csr & MUSB_RXCSR_P_OVERRUN) {
@@ -795,7 +789,7 @@ void musb_g_rx(struct musb *musb, u8 epnum)
 		DBG((csr & MUSB_RXCSR_DMAENAB) ? 4 : 1,
 			"%s busy, csr %04x\n",
 			musb_ep->end_point.name, csr);
-		goto done;
+		return;
 	}
 
 	if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
@@ -826,22 +820,15 @@ void musb_g_rx(struct musb *musb, u8 epnum)
 		if ((request->actual < request->length)
 				&& (musb_ep->dma->actual_len
 					== musb_ep->packet_sz))
-			goto done;
+			return;
 #endif
 		musb_g_giveback(musb_ep, request, 0);
 
 		request = next_request(musb_ep);
 		if (!request)
-			goto done;
-
-		/* don't start more i/o till the stall clears */
-		musb_ep_select(mbase, epnum);
-		csr = musb_readw(epio, MUSB_RXCSR);
-		if (csr & MUSB_RXCSR_P_SENDSTALL)
-			goto done;
+			return;
 	}
 
-
 	/* analyze request if the ep is hot */
 	if (request)
 		rxstate(musb, to_musb_request(request));
@@ -849,8 +836,6 @@ void musb_g_rx(struct musb *musb, u8 epnum)
 		DBG(3, "packet waiting for %s%s request\n",
 				musb_ep->desc ? "" : "inactive ",
 				musb_ep->end_point.name);
-
-done:
 	return;
 }
 
@@ -1244,7 +1229,7 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
 	void __iomem		*mbase;
 	unsigned long		flags;
 	u16			csr;
-	struct musb_request	*request = NULL;
+	struct musb_request	*request;
 	int			status = 0;
 
 	if (!ep)
@@ -1260,24 +1245,29 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
 
 	musb_ep_select(mbase, epnum);
 
-	/* cannot portably stall with non-empty FIFO */
 	request = to_musb_request(next_request(musb_ep));
-	if (value && musb_ep->is_in) {
-		csr = musb_readw(epio, MUSB_TXCSR);
-		if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
-			DBG(3, "%s fifo busy, cannot halt\n", ep->name);
-			spin_unlock_irqrestore(&musb->lock, flags);
-			return -EAGAIN;
+	if (value) {
+		if (request) {
+			DBG(3, "request in progress, cannot halt %s\n",
+			    ep->name);
+			status = -EAGAIN;
+			goto done;
+		}
+		/* Cannot portably stall with non-empty FIFO */
+		if (musb_ep->is_in) {
+			csr = musb_readw(epio, MUSB_TXCSR);
+			if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
+				DBG(3, "FIFO busy, cannot halt %s\n", ep->name);
+				status = -EAGAIN;
+				goto done;
+			}
 		}
-
 	}
 
 	/* set/clear the stall and toggle bits */
 	DBG(2, "%s: %s stall\n", ep->name, value ? "set" : "clear");
 	if (musb_ep->is_in) {
 		csr = musb_readw(epio, MUSB_TXCSR);
-		if (csr & MUSB_TXCSR_FIFONOTEMPTY)
-			csr |= MUSB_TXCSR_FLUSHFIFO;
 		csr |= MUSB_TXCSR_P_WZC_BITS
 			| MUSB_TXCSR_CLRDATATOG;
 		if (value)
@@ -1300,14 +1290,13 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
 		musb_writew(epio, MUSB_RXCSR, csr);
 	}
 
-done:
-
 	/* maybe start the first request in the queue */
 	if (!musb_ep->busy && !value && request) {
 		DBG(3, "restarting the request\n");
 		musb_ep_restart(musb, request);
 	}
 
+done:
 	spin_unlock_irqrestore(&musb->lock, flags);
 	return status;
 }
diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index 7a6778675ad3..522efb31b56b 100644
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -511,7 +511,8 @@ static void ep0_txstate(struct musb *musb)
 
 	/* update the flags */
 	if (fifo_count < MUSB_MAX_END0_PACKET
-			|| request->actual == request->length) {
+			|| (request->actual == request->length
+				&& !request->zero)) {
 		musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
 		csr |= MUSB_CSR0_P_DATAEND;
 	} else
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index cf94511485f2..e3ab40a966eb 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1301,8 +1301,11 @@ void musb_host_tx(struct musb *musb, u8 epnum)
 		return;
 	} else	if (usb_pipeisoc(pipe) && dma) {
 		if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
-				offset, length))
+				offset, length)) {
+			if (is_cppi_enabled() || tusb_dma_omap())
+				musb_h_tx_dma_start(hw_ep);
 			return;
+		}
 	} else	if (tx_csr & MUSB_TXCSR_DMAENAB) {
 		DBG(1, "not complete, but DMA enabled?\n");
 		return;
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 9c60d6d4908a..ebcc6d0e2e91 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1937,7 +1937,7 @@ static void ftdi_write_bulk_callback(struct urb *urb)
 		return;
 	}
 	/* account for transferred data */
-	countback = urb->actual_length;
+	countback = urb->transfer_buffer_length;
 	data_offset = priv->write_offset;
 	if (data_offset > 0) {
 		/* Subtract the control bytes */
@@ -1950,7 +1950,6 @@ static void ftdi_write_bulk_callback(struct urb *urb)
 
 	if (status) {
 		dbg("nonzero write bulk status received: %d", status);
-		return;
 	}
 
 	usb_serial_port_softint(port);
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 319aaf9725b3..0577e4b61114 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -336,6 +336,10 @@ static int  option_resume(struct usb_serial *serial);
 #define AIRPLUS_VENDOR_ID			0x1011
 #define AIRPLUS_PRODUCT_MCD650			0x3198
 
+/* 4G Systems products */
+#define FOUR_G_SYSTEMS_VENDOR_ID		0x1c9e
+#define FOUR_G_SYSTEMS_PRODUCT_W14		0x9603
+
 static struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
 	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
@@ -599,6 +603,7 @@ static struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_X060S) },
 	{ USB_DEVICE(AIRPLUS_VENDOR_ID, AIRPLUS_PRODUCT_MCD650) },
 	{ USB_DEVICE(TLAYTECH_VENDOR_ID, TLAYTECH_PRODUCT_TEU800) },
+	{ USB_DEVICE(FOUR_G_SYSTEMS_VENDOR_ID, FOUR_G_SYSTEMS_PRODUCT_W14) },
 	{ } /* Terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, option_ids);