On Sun, Jan 26, 2014 at 4:00 PM, Peter Chen <peter.chen@xxxxxxxxxxxxx> wrote:
> 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>
> ---
> 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);
Oh, I have not noticed spin_lock_irq, will change to usleep_range(3500, 4000)
after call unlock.
Peter
> changed = 1;
> }
> }
> --
> 1.7.8
>
>
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--
BR,
Peter Chen
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