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SubjectRe: [RFC/RFT] OHCI: Fix for regression in 2.6.37-rc1 since commit 3df7169e7
Alan,

The box with the problem has been repaired, and I am trying to debug it.

What I have learned so far:

The "unable to enumerate" message is triggered because PORT_OWNER is not set in
the status register.

So far, I have found that this bit is set in only 4 places:

1. set_owner()
2. store_companion()
3. ehci_hub_control()
4. ehci_relinquish_port()
5. check_reset_complete()

Of these, only #5 is called before the first enumeration message is logged, but
it is only called with arguments that never set the PORT_OWNED bit in the status.

At this point I'm at a loss. Could you please give me ideas on where I might look.

The logged data leading up to the first message are:

[ 3.002762] hub 4-0:1.0: USB hub found
[ 3.002780] hub 4-0:1.0: 5 ports detected
[ 3.088286] ehci_hcd 0000:00:02.1: usb: Entered check_reset_complete with
port_status 0x1005
[ 3.088433] ehci_hcd 0000:00:02.1: port 4 high speed
[ 3.144061] usb 1-4: new high speed USB device using ehci_hcd and address 2
[ 3.200286] ehci_hcd 0000:00:02.1: usb: Entered check_reset_complete with
port_status 0x1005
[ 3.200437] ehci_hcd 0000:00:02.1: port 4 high speed
[ 3.352298] ehci_hcd 0000:00:02.1: usb: Entered check_reset_complete with
port_status 0x1005
[ 3.352304] ehci_hcd 0000:00:02.1: port 5 high speed
[ 3.408071] usb 1-5: new high speed USB device using ehci_hcd and address 3
[ 3.454449] PM: Starting manual resume from disk
[ 3.464305] ehci_hcd 0000:00:02.1: usb: Entered check_reset_complete with
port_status 0x1005
[ 3.464449] ehci_hcd 0000:00:02.1: port 5 high speed
[ 3.600052] ehci_hcd 0000:00:04.1: usb: Entered check_reset_complete with
port_status 0x1001
[ 3.600202] ehci_hcd 0000:00:04.1: port 5 full speed --> companion
[ 3.600307] ehci_hcd 0000:00:04.1: Wrote 0x3001 to status reg
[ 3.656089] hub 2-0:1.0: unable to enumerate USB device on port 5
[ 3.656203] ehci_hcd 0000:00:04.1: In ehci_relinquish_port
[ 3.656295] ehci_hcd 0000:00:04.1: In set_owner
Thanks,

Larry


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