ENGR00261451-3 mx6-msl: usb: add debounce time for otgsc value

- For id/vbus value from otgsc, it needs 1ms debounce time
after the PHY enters stable.
- Delete the useless code.

Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/arch/arm/mach-mx6/usb_dr.c b/arch/arm/mach-mx6/usb_dr.c
index a843622557589e2dfafa6b259faa448bce632b34..8a80a6035497388f2b1037639a33130d5b17ba49 100644 (file)
--- a/arch/arm/mach-mx6/usb_dr.c
+++ b/arch/arm/mach-mx6/usb_dr.c
@@ -263,8 +263,14 @@ static void enter_phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata, boo
                 * it needs 10 clocks from 32Khz to normal work state, so
                 * 500us is the safe value for PHY enters stable status
                 * according to IC engineer.
+                *
+                * Besides, the digital value needs 1ms debounce time to
+                * wait the value to be stable. We have expected the
+                * value from OTGSC is correct after calling this API.
+                *
+                * So delay 2ms is a save value.
                 */
-               udelay(500);
+               mdelay(2);
 
        }
        pr_debug("DR: %s ends, enable is %d\n", __func__, enable);
@@ -537,8 +543,6 @@ static enum usb_wakeup_event _is_host_wakeup(struct fsl_usb2_platform_data *pdat
        /* if ID change sts, it is a host wakeup event */
        if (otgsc & OTGSC_IS_USB_ID) {
                pr_debug("otg host ID wakeup\n");
-               /* if host ID wakeup, we must clear the ID change sts */
-               otgsc |= OTGSC_IS_USB_ID;
                return WAKEUP_EVENT_ID;
        }
        if (wakeup_req  && (!(otgsc & OTGSC_STS_USB_ID))) {