On Sun, Aug 5, 2012 at 5:36 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > Build a kernel with CONFIG_USB_DEBUG enabled (and also > CONFIG_DEBUG_FS). When the hang occurs, go into the subdirectory of > /sys/kernel/debug/usb/ohci/ corresponding to the bus the device is > plugged into (0000:00:04.0 if your setup hasn't changed), and post > copies of the "registers" and "async" files. Thanks for the input, Alan. Here's the "registers", before plugging my device in: ----------------------------------------------------- bus pci, device 0000:00:04.0 OHCI Host Controller ohci_hcd OHCI 1.0, NO legacy support registers, rh state running control 0x68f RWE RWC HCFS=operational IE PLE CBSR=3 cmdstatus 0x00000 SOC=0 intrstatus 0x00000024 FNO SF intrenable 0x8000005a MIE RHSC UE RD WDH ed_controlhead c781f000 hcca frame 0xcca2 fmintvl 0xa7782edf FIT FSMPS=0xa778 FI=0x2edf fmremaining 0x80001500 FRT FR=0x1500 periodicstart 0x2a2f lsthresh 0x0700 hub poll timer off roothub.a 01001206 POTPGT=1 NOCP NPS NDP=6(6) roothub.b 00000000 PPCM=0000 DR=0000 roothub.status 00008000 DRWE roothub.portstatus [0] 0x00000100 PPS roothub.portstatus [1] 0x00000100 PPS roothub.portstatus [2] 0x00000303 LSDA PPS PES CCS roothub.portstatus [3] 0x00000100 PPS roothub.portstatus [4] 0x00000100 PPS roothub.portstatus [5] 0x00000100 PPS ----------------------------------------------------- Here's after plugging in, but before the hang: ----------------------------------------------------- bus pci, device 0000:00:04.0 OHCI Host Controller ohci_hcd OHCI 1.0, NO legacy support registers, rh state running control 0x68f RWE RWC HCFS=operational IE PLE CBSR=3 cmdstatus 0x00000 SOC=0 intrstatus 0x00000024 FNO SF intrenable 0x8000005a MIE RHSC UE RD WDH ed_controlhead c781f0a0 hcca frame 0x0db6 fmintvl 0xa7782edf FIT FSMPS=0xa778 FI=0x2edf fmremaining 0x80000296 FRT FR=0x0296 periodicstart 0x2a2f lsthresh 0x0700 hub poll timer off roothub.a 01001206 POTPGT=1 NOCP NPS NDP=6(6) roothub.b 00000000 PPCM=0000 DR=0000 roothub.status 00008000 DRWE roothub.portstatus [0] 0x00000100 PPS roothub.portstatus [1] 0x00000103 PPS PES CCS roothub.portstatus [2] 0x00000303 LSDA PPS PES CCS roothub.portstatus [3] 0x00000100 PPS roothub.portstatus [4] 0x00000100 PPS roothub.portstatus [5] 0x00000100 PPS ----------------------------------------------------- And finally the one after the USB is hung: ----------------------------------------------------- bus pci, device 0000:00:04.0 OHCI Host Controller ohci_hcd OHCI 1.0, NO legacy support registers, rh state running control 0x68f RWE RWC HCFS=operational IE PLE CBSR=3 cmdstatus 0x00000 SOC=0 intrstatus 0x00000020 FNO intrenable 0x8000005e MIE RHSC UE RD SF WDH ed_controlhead c781f0a0 ed_bulkhead c781f140 hcca frame 0x2b5d fmintvl 0xa7782edf FIT FSMPS=0xa778 FI=0x2edf fmremaining 0x800024e2 FRT FR=0x24e2 periodicstart 0x2a2f lsthresh 0x0700 hub poll timer off roothub.a 01001206 POTPGT=1 NOCP NPS NDP=6(6) roothub.b 00000000 PPCM=0000 DR=0000 roothub.status 00008000 DRWE roothub.portstatus [0] 0x00000100 PPS roothub.portstatus [1] 0x00000103 PPS PES CCS roothub.portstatus [2] 0x00000303 LSDA PPS PES CCS roothub.portstatus [3] 0x00000100 PPS roothub.portstatus [4] 0x00000100 PPS roothub.portstatus [5] 0x00000100 PPS ----------------------------------------------------- The "async" pseudofile yields nothing, every time . -- Tomas J. Sokorai Sch. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
