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    SubjectRe: device plugged into xhci port not detected after a resume
    Hey,

    Op 15-06-11 18:58, Sarah Sharp schreef:
    > On Wed, Jun 15, 2011 at 09:07:11AM +0200, Maarten Lankhorst wrote:
    >> I plugged a simple usb mouse in xhci that isn't found after a resume.
    >>
    >> It's with the same lovely controller as I used with the previous bug.
    >> Plugging in the controller to the same port doesn't cause it to be
    >> detected again, I need to remodprobe xhci-hcd
    > I will have to look at the log closely to be sure that this isn't a
    > software issue, but it seems like the host controller just died after
    > being suspended.
    That's what I gathered as well.
    >> [ 505.821216] xhci_hcd 0000:04:00.0: Queueing ctrl tx for slot id 1, ep 0
    > ...
    >> [ 510.805001] xhci_hcd 0000:04:00.0: Cancel URB ffff8801c7a0ae40
    > The xHCI driver submits a control transfer (probably to read the
    > descriptor from your mouse) and the host doesn't give it back. It times
    > out, so the xHCI driver issues a Stop Endpoint command to allow the
    > driver to take the control transfer off the endpoint ring.
    >
    >> [ 515.794819] xhci_hcd 0000:04:00.0: xHCI host not responding to stop endpoint command.
    > But the host doesn't respond to that command, so the xHCI driver assumes
    > the hardware is hosed:
    >
    >> [ 515.794823] xhci_hcd 0000:04:00.0: Assuming host is dying, halting host.
    >> [ 515.794830] xhci_hcd 0000:04:00.0: // Halt the HC
    >> [ 515.794840] xhci_hcd 0000:04:00.0: Killing URBs for slot ID 1, ep index 0
    >> [ 515.794847] xhci_hcd 0000:04:00.0: Killing URBs for slot ID 1, ep index 2
    >> [ 515.794850] xhci_hcd 0000:04:00.0: Killing URBs for slot ID 1, ep index 4
    >> [ 515.794854] xhci_hcd 0000:04:00.0: Calling usb_hc_died()
    >> [ 515.794856] xhci_hcd 0000:04:00.0: HC died; cleaning up
    >> [ 515.794860] xhci_hcd 0000:04:00.0: xHCI host controller is dead.
    > Does the host controller work when you don't have any devices plugged
    > in during resume? I.e. unplug the mouse and then re-plug it in on
    > resume. Does suspend work when other devices are left plugged in?
    Yikes, it doesn't seem to work even without any devices plugged in.
    It's frozen. This is with suspend-to-ram, not to disk.

    > Does hibernate work, either with no devices plugged in, or the mouse
    > plugged in? If it does work, the host controller may not be able to
    > handle the context save and restore during suspend/resume, and we may
    > need to unconditionally tell the USB core that the host lost power
    > across suspend.
    It works after a resume from suspend-to-disk.

    ~Maarten


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