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 <peter.chen@xxxxxxxxxxxxx>
---
Changes for v2:
Using usleep_range instead of mdelay
drivers/usb/host/ehci-hub.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 47b858f..976294c 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -301,6 +301,18 @@ 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.
+ */
+ spin_unlock_irq(&ehci->lock);
+ usleep_range(3500, 4000);
+ spin_lock_irq(&ehci->lock);
+ }
changed = 1;
}
}
--
1.7.8
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