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    SubjectRe: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe


    Yinghai Lu wrote:
    > On Fri, Apr 20, 2012 at 5:09 PM, Yinghai Lu <yinghai@kernel.org> wrote:
    >>> What do you mean "strange power state"? The only PCI power states the
    >>> xHCI driver will use is D0 or D3hot. D3hot is entered automatically by
    >>> the USB core runtime PM system when all USB devices are disconnected or
    >>> suspended. So what strange power state are we talking about?
    >>
    >> that's helpful. Can that feature to be disabled?
    >
    > please check and set
    > /sys/bus/pci/devices/0000:11:00.0/power/control
    > /sys/bus/pci/devices/0000:11:00.0/usb?/power/control
    > from auto to on

    I inserted the card, it was detected:

    [33335.295737] pci 0000:11:00.0: [1033:0194] type 00 class 0x0c0330
    [33335.295789] pci 0000:11:00.0: reg 10: [mem 0x00000000-0x00001fff 64bit]
    [33335.296043] pci 0000:11:00.0: PME# supported from D0 D3hot
    [33335.315688] pci 0000:11:00.0: BAR 0: assigned [mem 0xf6c00000-0xf6c01fff 64bit]
    [33335.315796] xhci_hcd 0000:11:00.0: enabling device (0100 -> 0102)
    [33335.315893] xhci_hcd 0000:11:00.0: xHCI Host Controller
    [33335.315897] xhci_hcd 0000:11:00.0: new USB bus registered, assigned bus number 5
    [33335.316178] xhci_hcd 0000:11:00.0: irq 19, io mem 0xf6c00000
    [33335.316281] xhci_hcd 0000:11:00.0: irq 53 for MSI/MSI-X
    [33335.316285] xhci_hcd 0000:11:00.0: irq 54 for MSI/MSI-X
    [33335.316288] xhci_hcd 0000:11:00.0: irq 55 for MSI/MSI-X
    [33335.316292] xhci_hcd 0000:11:00.0: irq 56 for MSI/MSI-X
    [33335.316296] xhci_hcd 0000:11:00.0: irq 57 for MSI/MSI-X
    [33335.316447] usb usb5: New USB device found, idVendor=1d6b, idProduct=0002
    [33335.316448] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
    [33335.316450] usb usb5: Product: xHCI Host Controller
    [33335.316451] usb usb5: Manufacturer: Linux 3.4.0-rc3-default xhci_hcd
    [33335.316452] usb usb5: SerialNumber: 0000:11:00.0
    [33335.316574] xHCI xhci_add_endpoint called for root hub
    [33335.316575] xHCI xhci_check_bandwidth called for root hub
    [33335.316597] hub 5-0:1.0: USB hub found
    [33335.316609] hub 5-0:1.0: 2 ports detected
    [33335.316680] xhci_hcd 0000:11:00.0: xHCI Host Controller
    [33335.316683] xhci_hcd 0000:11:00.0: new USB bus registered, assigned bus number 6
    [33335.319424] usb usb6: New USB device found, idVendor=1d6b, idProduct=0003
    [33335.319426] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
    [33335.319428] usb usb6: Product: xHCI Host Controller
    [33335.319429] usb usb6: Manufacturer: Linux 3.4.0-rc3-default xhci_hcd
    [33335.319430] usb usb6: SerialNumber: 0000:11:00.0
    [33335.319560] xHCI xhci_add_endpoint called for root hub
    [33335.319562] xHCI xhci_check_bandwidth called for root hub
    [33335.319584] hub 6-0:1.0: USB hub found
    [33335.319602] hub 6-0:1.0: 2 ports detected

    # cat /sys/bus/pci/devices/0000:11:00.0/power/control
    on
    # cat /sys/bus/pci/devices/0000:11:00.0/usb?/power/control
    auto
    auto
    # echo on > /sys/bus/pci/devices/0000:11:00.0/usb5/power/control
    # echo on > /sys/bus/pci/devices/0000:11:00.0/usb6/power/control
    #

    I removed the card and it was NOT detected.

    Note: I did the test with the running instance of kernel booted WITH pcie_aspm=off.
    Will reboot without tha option and re-try.

    Martin


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