Date:	Sat, 21 Apr 2012 11:01:59 +0200
From:	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	linux-pci@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: Re: 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@...nel.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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