If the high-speed device does not enter full-speed idle after wakeup on disconnect logic has effected, there will be an unexpected disconnect wakeup interrupt due to the bus is still SE0.
Signed-off-by: Peter Chen <[email protected]> --- drivers/usb/host/ehci-hub.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 47b858f..d14827d 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -301,6 +301,15 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) if (t1 != t2) { ehci_writel(ehci, t2, reg); + if ((t2 & PORT_WKDISC_E) + && (ehci_port_speed(ehci, t2) == + USB_PORT_STAT_HIGH_SPEED)) + /* + * If the high-speed device has not switched + * to full-speed idle before WKDISC_E has + * effected, there will be a WKDISC event. + */ + mdelay(4); changed = 1; } } -- 1.7.8 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
