1 files changed, 66 insertions, 4 deletions

diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 842ca6349a9..c2f19752c07 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -311,6 +311,7 @@ struct pch_udc_ep {
  * @registered:		driver regsitered with system
  * @suspended:		driver in suspended state
  * @connected:		gadget driver associated
+ * @vbus_session:	required vbus_session state
  * @set_cfg_not_acked:	pending acknowledgement 4 setup
  * @waiting_zlp_ack:	pending acknowledgement 4 ZLP
  * @data_requests:	DMA pool for data requests
@@ -337,6 +338,7 @@ struct pch_udc_dev {
 			registered:1,
 			suspended:1,
 			connected:1,
+			vbus_session:1,
 			set_cfg_not_acked:1,
 			waiting_zlp_ack:1;
 	struct pci_pool		*data_requests;
@@ -554,6 +556,31 @@ static void pch_udc_clear_disconnect(struct pch_udc_dev *dev)
 }
 
 /**
+ * pch_udc_reconnect() - This API initializes usb device controller,
+ *						and clear the disconnect status.
+ * @dev:		Reference to pch_udc_regs structure
+ */
+static void pch_udc_init(struct pch_udc_dev *dev);
+static void pch_udc_reconnect(struct pch_udc_dev *dev)
+{
+	pch_udc_init(dev);
+
+	/* enable device interrupts */
+	/* pch_udc_enable_interrupts() */
+	pch_udc_bit_clr(dev, UDC_DEVIRQMSK_ADDR,
+			UDC_DEVINT_UR | UDC_DEVINT_US |
+			UDC_DEVINT_ENUM |
+			UDC_DEVINT_SI | UDC_DEVINT_SC);
+
+	/* Clear the disconnect */
+	pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
+	pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_SD);
+	mdelay(1);
+	/* Resume USB signalling */
+	pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
+}
+
+/**
  * pch_udc_vbus_session() - set or clearr the disconnect status.
  * @dev:	Reference to pch_udc_regs structure
  * @is_active:	Parameter specifying the action
@@ -563,10 +590,18 @@ static void pch_udc_clear_disconnect(struct pch_udc_dev *dev)
 static inline void pch_udc_vbus_session(struct pch_udc_dev *dev,
 					  int is_active)
 {
-	if (is_active)
-		pch_udc_clear_disconnect(dev);
-	else
+	if (is_active) {
+		pch_udc_reconnect(dev);
+		dev->vbus_session = 1;
+	} else {
+		if (dev->driver && dev->driver->disconnect) {
+			spin_unlock(&dev->lock);
+			dev->driver->disconnect(&dev->gadget);
+			spin_lock(&dev->lock);
+		}
 		pch_udc_set_disconnect(dev);
+		dev->vbus_session = 0;
+	}
 }
 
 /**
@@ -1126,7 +1161,17 @@ static int pch_udc_pcd_pullup(struct usb_gadget *gadget, int is_on)
 	if (!gadget)
 		return -EINVAL;
 	dev = container_of(gadget, struct pch_udc_dev, gadget);
-	pch_udc_vbus_session(dev, is_on);
+	if (is_on) {
+		pch_udc_reconnect(dev);
+	} else {
+		if (dev->driver && dev->driver->disconnect) {
+			spin_unlock(&dev->lock);
+			dev->driver->disconnect(&dev->gadget);
+			spin_lock(&dev->lock);
+		}
+		pch_udc_set_disconnect(dev);
+	}
+
 	return 0;
 }
 
@@ -2482,6 +2527,15 @@ static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr)
 			dev->driver->suspend(&dev->gadget);
 			spin_lock(&dev->lock);
 		}
+
+		if (dev->vbus_session == 0) {
+			if (dev->driver && dev->driver->disconnect) {
+				spin_unlock(&dev->lock);
+				dev->driver->disconnect(&dev->gadget);
+				spin_lock(&dev->lock);
+			}
+			pch_udc_reconnect(dev);
+		}
 		dev_dbg(&dev->pdev->dev, "USB_SUSPEND\n");
 	}
 	/* Clear the SOF interrupt, if enabled */
@@ -2509,6 +2563,14 @@ static irqreturn_t pch_udc_isr(int irq, void *pdev)
 	dev_intr = pch_udc_read_device_interrupts(dev);
 	ep_intr = pch_udc_read_ep_interrupts(dev);
 
+	/* For a hot plug, this find that the controller is hung up. */
+	if (dev_intr == ep_intr)
+		if (dev_intr == pch_udc_readl(dev, UDC_DEVCFG_ADDR)) {
+			dev_dbg(&dev->pdev->dev, "UDC: Hung up\n");
+			/* The controller is reset */
+			pch_udc_writel(dev, UDC_SRST, UDC_SRST_ADDR);
+			return IRQ_HANDLED;
+		}
 	if (dev_intr)
 		/* Clear device interrupts */
 		pch_udc_write_device_interrupts(dev, dev_intr);