ENGR00169661:Remove the discharge for VBUS and DP

- VBUS discharge code should be removed from suspend_irq function
- On Arik, there is a huge capacitance(C86), even discharge VBUS,
  the Drop of VBUS is still very slow
- On Arik, the B session valid threshold is not 0.8V or 1.4V, it is
  about 2V~3V, so we can receive B session valid interrupt very soon
- No DP discharge needed, but wait for SE0 is needed
Signed-off-by: Tony LIU <junjie.liu@freescale.com>

diff --git a/drivers/usb/gadget/arcotg_udc.c b/drivers/usb/gadget/arcotg_udc.c
index 391ba58205279f6e357e752f74742ced4532587f..af27c7f1531d2f20c64565e20a9a81acc8ce2fd4 100755 (executable)
--- a/drivers/usb/gadget/arcotg_udc.c
+++ b/drivers/usb/gadget/arcotg_udc.c
@@ -2009,20 +2009,10 @@ static void port_change_irq(struct fsl_udc *udc)
 /* Process suspend interrupt */
 static void suspend_irq(struct fsl_udc *udc)
 {
-       u32 otgsc = 0;
-
        pr_debug("%s begins\n", __func__);
 
        udc->resume_state = udc->usb_state;
        udc->usb_state = USB_STATE_SUSPENDED;
-
-       /* Set discharge vbus */
-       otgsc = fsl_readl(&dr_regs->otgsc);
-       otgsc &= ~(OTGSC_INTSTS_MASK);
-       otgsc |= OTGSC_CTRL_VBUS_DISCHARGE;
-       fsl_writel(otgsc, &dr_regs->otgsc);
-
-
        /* report suspend to the driver, serial.c does not support this */
        if (udc->driver->suspend)
                udc->driver->suspend(&udc->gadget);
@@ -2107,7 +2097,7 @@ static void gadget_wait_line_to_se0(void)
                                        " your hardware design!\n");
                        break;
                }
-               msleep(10);
+               msleep(1);
        }
 }
 
@@ -2144,10 +2134,6 @@ static void fsl_gadget_disconnect_event(struct work_struct *work)
        u32 tmp;
 
        pdata = udc->pdata;
-
-       /* enable pulldown dp */
-       if (pdata->gadget_discharge_dp)
-               pdata->gadget_discharge_dp(true);
        /*
         * Some boards are very slow change line state from J to SE0 for DP,
         * So, we need to discharge DP, otherwise there is a wakeup interrupt
@@ -2155,10 +2141,6 @@ static void fsl_gadget_disconnect_event(struct work_struct *work)
         */
        gadget_wait_line_to_se0();
 
-       /* Disable pulldown dp */
-       if (pdata->gadget_discharge_dp)
-               pdata->gadget_discharge_dp(false);
-
        /*
         * Wait class drivers finish, an well-behaviour class driver should
         * call ep_disable when it is notified to be disconnected.
@@ -2216,6 +2198,7 @@ bool try_wake_up_udc(struct fsl_udc *udc)
                        fsl_writel(tmp | USB_CMD_RUN_STOP, &dr_regs->usbcmd);
                        printk(KERN_DEBUG "%s: udc out low power mode\n", __func__);
                } else {
+                       printk(KERN_INFO "USB device disconnected\n");
                        fsl_writel(tmp & ~USB_CMD_RUN_STOP, &dr_regs->usbcmd);
                        /* here we need disable B_SESSION_IRQ, after
                         * schedule_work finished, it need to be enabled again.