On Fri, Oct 12, 2012 at 11:04:25AM -0400, Alan Stern wrote:
> On Fri, 12 Oct 2012, Peter Chen wrote:
>
> > Taking EHCI controller as an example, it just needs to change
> > ehci_bus_resume,
> > if there is any enabled, unsuspended port, set
> > hcd->unsuspended_device_on_port
>
> We don't need to do that. See below.
>
> > > usb_bus_resume() can poll the port statuses to see if there are any
> > > enabled, unsuspended ports. If there aren't any, the delay can be
> > > skipped.
> > Taking EHCI controller as an example, you mean:
> >
> > - Change hcd_bus_resume like below:
> >
> > status = hcd->driver->bus_resume(hcd);
> > clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
> > if (status == 0) {
> > char buffer[6];
> >
> > status = hcd->driver->hub_status_data(hcd, buffer);
> > if (status != 0) {
> > /* There are any enabled unsuspended ports */
> > /* TRSMRCY = 10 msec */
> > msleep(10);
> > spin_lock_irq(&hcd_root_hub_lock);
> > - Add get any enabled, unsuspended port as port change condition at
> > ehci_hub_status_data.
>
> No, like this:
>
> --- usb-3.6.orig/drivers/usb/core/hcd.c
> +++ usb-3.6/drivers/usb/core/hcd.c
> @@ -2023,6 +2023,7 @@ int hcd_bus_resume(struct usb_device *rh
> struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
> int status;
> int old_state = hcd->state;
> + int port1;
>
> dev_dbg(&rhdev->dev, "usb %sresume\n",
> (PMSG_IS_AUTO(msg) ? "auto-" : ""));
> @@ -2039,8 +2040,6 @@ int hcd_bus_resume(struct usb_device *rh
> status = hcd->driver->bus_resume(hcd);
> clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
> if (status == 0) {
> - /* TRSMRCY = 10 msec */
> - msleep(10);
> spin_lock_irq(&hcd_root_hub_lock);
> if (!HCD_DEAD(hcd)) {
> usb_set_device_state(rhdev, rhdev->actconfig
> @@ -2050,6 +2049,22 @@ int hcd_bus_resume(struct usb_device *rh
> hcd->state = HC_STATE_RUNNING;
> }
> spin_unlock_irq(&hcd_root_hub_lock);
> +
> + /* Any enabled non-suspended port requires TRSMRCY delay */
> + for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
> + __le16 buf[2];
> + unsigned pstatus;
> +
> + buf[0] = 0;
> + hcd->driver->hub_control(hcd, USB_DIR_IN | USB_RT_PORT,
> + 0, port1, (char *) buf, 4);
> + pstatus = le16_to_cpu(buf[0]);
> + if ((pstatus & USB_PORT_STAT_ENABLE) &&
> + !(pstatus & USB_PORT_STAT_SUSPEND)) {
> + msleep(10); /* TRSMRCY */
> + break;
> + }
> + }
> } else {
> hcd->state = old_state;
> dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
>
> I haven't tested this, just compiled it.
I have tested it at Freescale i.mx6Q sabrelite board, your patch is ok.
Will you post a patch or I do it for you?
>
> Alan Stern
>
>
--
Best Regards,
Peter Chen
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