ENGR00234722 USB: fix Kernel dump issue after USB driver loadable

- It is better to disable otgsc and wake up interrupt to avoid an
  abnormal interrupt happen during USB driver being removed.
- If the USB host is already at low power mode, only need turn on
  the clock, no need turn off the clock.
- Need discharge dp and dm during USB driver being removed ,in order
  to avoid a wakeup interrupt happen. And if the USB otg is in host
  mode, we should clear discharge dp and dm in fsl_otg_set_host()
  during system boot up.

Signed-off-by: make shi <b15407@freescale.com>

drivers/usb/gadget/arcotg_udc.c

@@ -3248,7 +3248,7 @@ static int __devinit fsl_udc_probe(struct platform_device *pdev)
 static int  fsl_udc_remove(struct platform_device *pdev)
 {
 	struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
-
+	u32 temp;
 	DECLARE_COMPLETION(done);
 
 	if (!udc_controller)
@@ -3258,6 +3258,13 @@ static int  fsl_udc_remove(struct platform_device *pdev)
 	if (udc_controller->stopped)
 		dr_clk_gate(true);
 
+	/* disable wake up and otgsc interrupt for safely remove udc driver*/
+	temp = fsl_readl(&dr_regs->otgsc);
+	temp &= ~(0x7f << 24);
+	fsl_writel(temp, &dr_regs->otgsc);
+	dr_wake_up_enable(udc_controller, false);
+
+	dr_discharge_line(pdata, true);
 	/* DR has been stopped in usb_gadget_unregister_driver() */
 	remove_proc_file();
 

drivers/usb/host/ehci-arc.c

@@ -339,14 +339,14 @@ static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
 		if (pdata->usb_clock_for_pm)
 			pdata->usb_clock_for_pm(true);
 
+		/*disable the wakeup to avoid an abnormal wakeup interrupt*/
+		usb_host_set_wakeup(hcd->self.controller, false);
+
 		tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);
 		if (tmp & PORT_PTS_PHCD) {
 			tmp &= ~PORT_PTS_PHCD;
 			ehci_writel(ehci, tmp, &ehci->regs->port_status[0]);
 			msleep(100);
-
-			if (pdata->usb_clock_for_pm)
-				pdata->usb_clock_for_pm(false);
 		}
 	}
 

drivers/usb/otg/fsl_otg.c

@@ -607,6 +607,9 @@ int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
 static int fsl_otg_set_host(struct otg_transceiver *otg_p, struct usb_bus *host)
 {
 	struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);
+	struct fsl_usb2_platform_data *pdata;
+
+	pdata = otg_dev->otg.dev->platform_data;
 
 	if (!otg_p || otg_dev != fsl_otg_dev)
 		return -ENODEV;
@@ -633,6 +636,8 @@ static int fsl_otg_set_host(struct otg_transceiver *otg_p, struct usb_bus *host)
 		else {
 			/* if the device is already at the port */
 			otg_drv_vbus(&otg_dev->fsm, 1);
+			if (pdata->dr_discharge_line)
+				pdata->dr_discharge_line(false);
 			fsl_otg_wait_stable_vbus(true);
 			b_session_irq_enable(false);
 			fsl_otg_start_host(&otg_dev->fsm, 1);