Re: kernel does not receive any USB3.0 plug/unplug events from the Renesas upd720202 chipset

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Hello.
lspci -vvv show irq 11 for the device but cat/proc/interrupts show
interrupts 16 and 17 for xhci_hcd but my pc only has interrupts 0 to
15
Can that be the mistake?

cat /proc/interrupts
           CPU0
  0:      32949    XT-PIC      timer
  1:        433    XT-PIC      i8042
  2:          0    XT-PIC      cascade
  4:          1    XT-PIC      uhci_hcd:usb1, enp0s9
  6:          3    XT-PIC      floppy
  8:          0    XT-PIC      rtc0
  9:          0    XT-PIC      acpi
 10:       1633    XT-PIC      radeon
 12:      27377    XT-PIC      i8042
 14:        798    XT-PIC      ata_piix
 15:      76817    XT-PIC      ata_piix, pata_pdc2027x[0000:00:0e.0], enp0s10
 16:          0   PCI-MSI 1048576-edge      xhci_hcd
 17:          0   PCI-MSI 1048577-edge      xhci_hcd
NMI:         97   Non-maskable interrupts
LOC:      66408   Local timer interrupts
SPU:          0   Spurious interrupts
PMI:         97   Performance monitoring interrupts
IWI:          3   IRQ work interrupts
RTR:          0   APIC ICR read retries
RES:          0   Rescheduling interrupts
CAL:          0   Function call interrupts
TLB:          0   TLB shootdowns
TRM:          0   Thermal event interrupts
THR:          0   Threshold APIC interrupts
DFR:          0   Deferred Error APIC interrupts
MCE:          0   Machine check exceptions
MCP:          3   Machine check polls
ERR:          0
MIS:          0
PIN:          0   Posted-interrupt notification event
PIW:          0   Posted-interrupt wakeup event


lspci

02:00.0 USB controller: Renesas Technology Corp. uPD720202 USB 3.0
Host Controller (rev 02) (prog-if 30 [XHCI])
    Subsystem: Renesas Technology Corp. uPD720202 USB 3.0 Host Controller
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 32 bytes
    Interrupt: pin A routed to IRQ 11
    Region 0: Memory at b5000000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: [50] Power Management version 3
        Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
        Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
        Address: 0000000000000000  Data: 0000
    Capabilities: [90] MSI-X: Enable+ Count=8 Masked-
        Vector table: BAR=0 offset=00001000
        PBA: BAR=0 offset=00001080
    Capabilities: [a0] Express (v2) Endpoint, MSI 00
        DevCap:    MaxPayload 128 bytes, PhantFunc 0, Latency L0s
unlimited, L1 unlimited
            ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
        DevCtl:    Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
            RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
            MaxPayload 128 bytes, MaxReadReq 512 bytes
        DevSta:    CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
        LnkCap:    Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Exit
Latency L0s <4us, L1 unlimited
            ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
        LnkCtl:    ASPM Disabled; RCB 64 bytes Disabled- CommClk-
            ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta:    Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
        DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR+,
OBFF Not Supported
        DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
        LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
             Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
             Compliance De-emphasis: -6dB
        LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete-, EqualizationPhase1-
             EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
    Kernel driver in use: xhci_hcd































2017-05-23 12:55 GMT+02:00 Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>:
> On 22.05.2017 21:24, Xavier . wrote:
>>
>> Hello and thanks
>>
>> dmesg.4.12-rc1.with_dyndbg_pendrive_connected_at_boot_1r.txt (1r and
>> 2n are very different on xhci)
>>
>>
>> [    0.000000] Linux version 4.12.0-041200rc1-generic (kernel@gomeisa)
>> (gcc version 6.3.0 20170510 (Ubuntu 6.3.0-17ubuntu1) ) #201705131731
>> SMP Sat May 13 21:48:41 UTC 2017
>
> ...
>>
>> [    4.281409] xhci_hcd 0000:02:00.0: xHCI Host Controller
>>
>> [    4.281431] xhci_hcd 0000:02:00.0: new USB bus registered, assigned
>> bus number 2
>> [    4.281466] xhci_hcd 0000:02:00.0: xHCI capability registers at
>> f8452000:
>> [    4.281473] xhci_hcd 0000:02:00.0: CAPLENGTH AND HCIVERSION 0x1000020:
>> [    4.281477] xhci_hcd 0000:02:00.0: CAPLENGTH: 0x20
>> [    4.281482] xhci_hcd 0000:02:00.0: HCIVERSION: 0x100
>> [    4.281489] xhci_hcd 0000:02:00.0: HCSPARAMS 1: 0x4000820
>> [    4.281493] xhci_hcd 0000:02:00.0:   Max device slots: 32
>> [    4.281498] xhci_hcd 0000:02:00.0:   Max interrupters: 8
>> [    4.281502] xhci_hcd 0000:02:00.0:   Max ports: 4
>> [    4.281509] xhci_hcd 0000:02:00.0: HCSPARAMS 2: 0x24000011
>> [    4.281513] xhci_hcd 0000:02:00.0:   Isoc scheduling threshold: 1
>> [    4.281518] xhci_hcd 0000:02:00.0:   Maximum allowed segments in
>> event ring: 1
>> [    4.281524] xhci_hcd 0000:02:00.0: HCSPARAMS 3 0x0:
>> [    4.281529] xhci_hcd 0000:02:00.0:   Worst case U1 device exit latency:
>> 0
>> [    4.281533] xhci_hcd 0000:02:00.0:   Worst case U2 device exit latency:
>> 0
>> [    4.281540] xhci_hcd 0000:02:00.0: HCC PARAMS 0x14051cf:
>> [    4.281545] xhci_hcd 0000:02:00.0:   HC generates 64 bit addresses
>> [    4.281549] xhci_hcd 0000:02:00.0:   HC hasn't Contiguous Frame ID
>> Capability
>> [    4.281554] xhci_hcd 0000:02:00.0:   HC can't generate Stopped -
>> Short Package event
>> [    4.281558] xhci_hcd 0000:02:00.0:   FIXME: more HCCPARAMS debugging
>> [    4.281565] xhci_hcd 0000:02:00.0: RTSOFF 0x600:
>> [    4.281570] xhci_hcd 0000:02:00.0: xHCI operational registers at
>> f8452020:
>> [    4.281576] xhci_hcd 0000:02:00.0: USBCMD 0x0:
>> [    4.281581] xhci_hcd 0000:02:00.0:   HC is being stopped
>> [    4.281585] xhci_hcd 0000:02:00.0:   HC has finished hard reset
>> [    4.281589] xhci_hcd 0000:02:00.0:   Event Interrupts disabled
>> [    4.281594] xhci_hcd 0000:02:00.0:   Host System Error Interrupts
>> disabled
>> [    4.281598] xhci_hcd 0000:02:00.0:   HC has finished light reset
>> [    4.281605] xhci_hcd 0000:02:00.0: USBSTS 0x1:
>> [    4.281609] xhci_hcd 0000:02:00.0:   Event ring is empty
>> [    4.281613] xhci_hcd 0000:02:00.0:   No Host System Error
>> [    4.281617] xhci_hcd 0000:02:00.0:   HC is halted
>> [    4.281625] xhci_hcd 0000:02:00.0: f8452420 port status reg = 0x80
>> [    4.281632] xhci_hcd 0000:02:00.0: f8452424 port power reg = 0x0
>> [    4.281640] xhci_hcd 0000:02:00.0: f8452428 port link reg = 0x0
>> [    4.281647] xhci_hcd 0000:02:00.0: f845242c port reserved reg = 0x0
>> [    4.281654] xhci_hcd 0000:02:00.0: f8452430 port status reg = 0x80
>> [    4.281661] xhci_hcd 0000:02:00.0: f8452434 port power reg = 0x0
>> [    4.281668] xhci_hcd 0000:02:00.0: f8452438 port link reg = 0x0
>> [    4.281676] xhci_hcd 0000:02:00.0: f845243c port reserved reg = 0x0
>> [    4.281683] xhci_hcd 0000:02:00.0: f8452440 port status reg = 0x80
>> [    4.281690] xhci_hcd 0000:02:00.0: f8452444 port power reg = 0x0
>> [    4.281697] xhci_hcd 0000:02:00.0: f8452448 port link reg = 0x0
>> [    4.281704] xhci_hcd 0000:02:00.0: f845244c port reserved reg = 0x0
>> [    4.281711] xhci_hcd 0000:02:00.0: f8452450 port status reg = 0x80
>> [    4.281718] xhci_hcd 0000:02:00.0: f8452454 port power reg = 0x0
>> [    4.281725] xhci_hcd 0000:02:00.0: f8452458 port link reg = 0x0
>> [    4.281732] xhci_hcd 0000:02:00.0: f845245c port reserved reg = 0x0
>> [    4.281738] xhci_hcd 0000:02:00.0: QUIRK: Resetting on resume
>> [    4.281743] xhci_hcd 0000:02:00.0: // Halt the HC
>> [    4.281755] xhci_hcd 0000:02:00.0: Resetting HCD
>> [    4.281762] xhci_hcd 0000:02:00.0: // Reset the HC
>> [    4.286927] xhci_hcd 0000:02:00.0: Wait for controller to be ready
>> for doorbell rings
>> [    4.286934] xhci_hcd 0000:02:00.0: Reset complete
>> [    4.286940] xhci_hcd 0000:02:00.0: Enabling 64-bit DMA addresses.
>> [    4.286944] xhci_hcd 0000:02:00.0: Calling HCD init
>> [    4.286949] xhci_hcd 0000:02:00.0: xhci_init
>> [    4.286953] xhci_hcd 0000:02:00.0: xHCI doesn't need link TRB QUIRK
>> [    4.286960] xhci_hcd 0000:02:00.0: Supported page size register = 0x1
>> [    4.286965] xhci_hcd 0000:02:00.0: Supported page size of 4K
>> [    4.286969] xhci_hcd 0000:02:00.0: HCD page size set to 4K
>> [    4.286976] xhci_hcd 0000:02:00.0: // xHC can handle at most 32 device
>> slots.
>> [    4.286982] xhci_hcd 0000:02:00.0: // Setting Max device slots reg =
>> 0x20.
>> [    4.287128] ata2: port disabled--ignoring
>> [    4.287171] xhci_hcd 0000:02:00.0: // Device context base array
>> address = 0x35617000 (DMA), f5617000 (virt)
>> [    4.287194] xhci_hcd 0000:02:00.0: Allocated command ring at f5615840
>> [    4.287198] xhci_hcd 0000:02:00.0: First segment DMA is 0x35620000
>> [    4.287207] xhci_hcd 0000:02:00.0: // Setting command ring address
>> to 0x0000000035620001
>> [    4.287216] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr low
>> bits + flags = @00000000
>> [    4.287221] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr high
>> bits = @00000000
>> [    4.287239] xhci_hcd 0000:02:00.0: // Doorbell array is located at
>> offset 0x800 from cap regs base addr
>> [    4.287244] xhci_hcd 0000:02:00.0: // xHCI capability registers at
>> f8452000:
>> [    4.287251] xhci_hcd 0000:02:00.0: // @f8452000 = 0x1000020
>> (CAPLENGTH AND HCIVERSION)
>> [    4.287255] xhci_hcd 0000:02:00.0: //   CAPLENGTH: 0x20
>> [    4.287260] xhci_hcd 0000:02:00.0: //   HCIVERSION: 0x100
>> [    4.287265] xhci_hcd 0000:02:00.0: // xHCI operational registers at
>> f8452020:
>> [    4.287271] xhci_hcd 0000:02:00.0: // @f8452018 = 0x600 RTSOFF
>> [    4.287276] xhci_hcd 0000:02:00.0: // xHCI runtime registers at
>> f8452600:
>> [    4.287282] xhci_hcd 0000:02:00.0: // @f8452014 = 0x800 DBOFF
>> [    4.287286] xhci_hcd 0000:02:00.0: // Doorbell array at f8452800:
>> [    4.287291] xhci_hcd 0000:02:00.0: xHCI runtime registers at f8452600:
>> [    4.287297] xhci_hcd 0000:02:00.0:   f8452600: Microframe index = 0x0
>> [    4.287313] xhci_hcd 0000:02:00.0: // Allocating event ring
>> [    4.287336] xhci_hcd 0000:02:00.0: TRB math tests passed.
>> [    4.287343] xhci_hcd 0000:02:00.0: // Allocated event ring segment
>> table at 0x35623000
>> [    4.287349] xhci_hcd 0000:02:00.0: Set ERST to 0; private num segs
>> = 1, virt addr = f5623000, dma addr = 0x35623000
>> [    4.287355] xhci_hcd 0000:02:00.0: // Write ERST size = 1 to ir_set
>> 0 (some bits preserved)
>> [    4.287360] xhci_hcd 0000:02:00.0: // Set ERST entries to point to
>> event ring.
>> [    4.287365] xhci_hcd 0000:02:00.0: // Set ERST base address for
>> ir_set 0 = 0x35623000
>> [    4.287377] xhci_hcd 0000:02:00.0: // Write event ring dequeue
>> pointer, preserving EHB bit
>> [    4.287381] xhci_hcd 0000:02:00.0: Wrote ERST address to ir_set 0.
>> [    4.287389] xhci_hcd 0000:02:00.0: Allocating 4 scratchpad buffers
>> [    4.287452] xhci_hcd 0000:02:00.0: Ext Cap f8452510, port offset =
>> 1, count = 2, revision = 0x3
>> [    4.287466] xhci_hcd 0000:02:00.0: Ext Cap f8452524, port offset =
>> 3, count = 2, revision = 0x2
>> [    4.287470] xhci_hcd 0000:02:00.0: xHCI 1.0: support USB2 software lpm
>> [    4.287475] xhci_hcd 0000:02:00.0: Found 2 USB 2.0 ports and 2 USB 3.0
>> ports.
>> [    4.287481] xhci_hcd 0000:02:00.0: USB 2.0 port at index 2, addr =
>> f8452440
>> [    4.287486] xhci_hcd 0000:02:00.0: USB 2.0 port at index 3, addr =
>> f8452450
>> [    4.287491] xhci_hcd 0000:02:00.0: USB 3.0 port at index 0, addr =
>> f8452420
>> [    4.287496] xhci_hcd 0000:02:00.0: USB 3.0 port at index 1, addr =
>> f8452430
>> [    4.287502] xhci_hcd 0000:02:00.0: Finished xhci_init
>> [    4.287508] xhci_hcd 0000:02:00.0: Called HCD init
>> [    4.287514] xhci_hcd 0000:02:00.0: hcc params 0x014051cf hci
>> version 0x100 quirks 0x00000090
>> [    4.287528] xhci_hcd 0000:02:00.0: xhci_run
>> [    4.287743] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr low
>> bits + flags = @00000000
>> [    4.287748] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr high
>> bits = @00000000
>> [    4.287752] xhci_hcd 0000:02:00.0: ERST memory map follows:
>> [    4.287759] xhci_hcd 0000:02:00.0: @0000000035623000 35622000
>> 00000000 00000100 00000000
>> [    4.287767] xhci_hcd 0000:02:00.0: ERST deq = 64'h35622000
>> [    4.287772] xhci_hcd 0000:02:00.0: // Set the interrupt modulation
>> register
>> [    4.287780] xhci_hcd 0000:02:00.0: // Enable interrupts, cmd = 0x4.
>> [    4.287787] xhci_hcd 0000:02:00.0: // Enabling event ring
>> interrupter f8452620 by writing 0x2 to irq_pending
>> [    4.287794] xhci_hcd 0000:02:00.0:   f8452620: ir_set[0]
>> [    4.287799] xhci_hcd 0000:02:00.0:   f8452620: ir_set.pending = 0x2
>> [    4.287806] xhci_hcd 0000:02:00.0:   f8452624: ir_set.control = 0xa0
>> [    4.287812] xhci_hcd 0000:02:00.0:   f8452628: ir_set.erst_size = 0x1
>> [    4.287822] xhci_hcd 0000:02:00.0:   f8452630: ir_set.erst_base =
>> @35623000
>> [    4.287831] xhci_hcd 0000:02:00.0:   f8452638: ir_set.erst_dequeue
>> = @35622000
>> [    4.287835] xhci_hcd 0000:02:00.0: Finished xhci_run for USB2 roothub
>> [    4.287996] usb usb2: New USB device found, idVendor=1d6b,
>> idProduct=0002
>> [    4.288002] usb usb2: New USB device strings: Mfr=3, Product=2,
>> SerialNumber=1
>> [    4.288007] usb usb2: Product: xHCI Host Controller
>> [    4.288011] usb usb2: Manufacturer: Linux 4.12.0-041200rc1-generic
>> xhci-hcd
>> [    4.288015] usb usb2: SerialNumber: 0000:02:00.0
>> [    4.288369] xHCI xhci_add_endpoint called for root hub
>> [    4.288374] xHCI xhci_check_bandwidth called for root hub
>> [    4.288383] xhci_hcd 0000:02:00.0: Endpoint 0x81 ep reset callback
>> called
>> [    4.288493] hub 2-0:1.0: USB hub found
>> [    4.288526] hub 2-0:1.0: 2 ports detected
>> [    4.288703] xhci_hcd 0000:02:00.0: set port power, actual port 0
>> status  = 0x2a0
>> [    4.288731] xhci_hcd 0000:02:00.0: set port power, actual port 1
>> status  = 0x2a0
>> [    4.288899] xhci_hcd 0000:02:00.0: xHCI Host Controller
>> [    4.288915] xhci_hcd 0000:02:00.0: new USB bus registered, assigned
>> bus number 3
>> [    4.288931] xhci_hcd 0000:02:00.0: // Turn on HC, cmd = 0x5.
>> [    4.290521] xhci_hcd 0000:02:00.0: Finished xhci_run for USB3 roothub
>> [    4.290573] usb usb3: We don't know the algorithms for LPM for this
>> host, disabling LPM.
>> [    4.290759] usb usb3: New USB device found, idVendor=1d6b,
>> idProduct=0003
>> [    4.290765] usb usb3: New USB device strings: Mfr=3, Product=2,
>> SerialNumber=1
>> [    4.290769] usb usb3: Product: xHCI Host Controller
>> [    4.290774] usb usb3: Manufacturer: Linux 4.12.0-041200rc1-generic
>> xhci-hcd
>> [    4.290778] usb usb3: SerialNumber: 0000:02:00.0
>> [    4.291049] xHCI xhci_add_endpoint called for root hub
>> [    4.291053] xHCI xhci_check_bandwidth called for root hub
>> [    4.291060] xhci_hcd 0000:02:00.0: Endpoint 0x81 ep reset callback
>> called
>> [    4.291176] hub 3-0:1.0: USB hub found
>> [    4.291204] hub 3-0:1.0: 2 ports detected
>> [    4.291401] xhci_hcd 0000:02:00.0: set port power, actual port 0
>> status  = 0x2a0
>> [    4.291430] xhci_hcd 0000:02:00.0: set port power, actual port 1
>> status  = 0x2a0
>
>
> ...
>
>> [    4.390793] xhci_hcd 0000:02:00.0: get port status, actual port 0
>> status  = 0x2a0
>> [    4.390800] xhci_hcd 0000:02:00.0: Get port status returned 0x100
>> [    4.390838] xhci_hcd 0000:02:00.0: get port status, actual port 1
>> status  = 0x202e1
>> [    4.390843] xhci_hcd 0000:02:00.0: Get port status returned 0x10101
>> [    4.390873] xhci_hcd 0000:02:00.0: clear port connect change,
>> actual port 1 status  = 0x2e1
>> [    4.394856] xhci_hcd 0000:02:00.0: get port status, actual port 0
>> status  = 0x2a0
>> [    4.394865] xhci_hcd 0000:02:00.0: Get port status returned 0x2a0
>> [    4.394932] xhci_hcd 0000:02:00.0: get port status, actual port 1
>> status  = 0x2a0
>> [    4.394937] xhci_hcd 0000:02:00.0: Get port status returned 0x2a0
>> [    4.395004] xhci_hcd 0000:02:00.0: set port remote wake mask,
>> actual port 0 status  = 0xe0002a0
>> [    4.395037] xhci_hcd 0000:02:00.0: set port remote wake mask,
>> actual port 1 status  = 0xe0002a0
>> [    4.395090] xhci_hcd 0000:02:00.0: xhci_hub_status_data: stopping
>> port polling.
>
>
>> [    4.494950] xhci_hcd 0000:02:00.0: get port status, actual port 1
>> status  = 0x2e1
>> [    4.494959] xhci_hcd 0000:02:00.0: Get port status returned 0x101
>> [    4.495012] xhci_hcd 0000:02:00.0: // Ding dong!
>
>
> Queued the first enable slot command and wait for it to complete
> Everything looks good so far.
>
>> [    9.698731] xhci_hcd 0000:02:00.0: Command timeout
>> [    9.698736] xhci_hcd 0000:02:00.0: Abort command ring
>> [   11.714714] xhci_hcd 0000:02:00.0: No stop event for abort, ring start
>> fail?
>> [   11.714732] xhci_hcd 0000:02:00.0: Error while assigning device slot ID
>
>
> 5 seconds later driver times out on the command.
> To me this looks like we never get the command completiong interrupt
>
> Actually this looks like interupts are not working for xhci at all.
>
> Are there any interrupts for xhci? does /proc/interrupts show
> 0 interrupts for xhci for 4.12-rc1
>
>
>> [   11.714923] xhci_hcd 0000:02:00.0: Max number of devices this xHCI
>> host supports is 32.
>> [   11.715132] usb usb2-port2: couldn't allocate usb_device
>> [   11.715290] xhci_hcd 0000:02:00.0: disable port, actual port 1
>> status  = 0x2e1
>> [   11.715381] xhci_hcd 0000:02:00.0: xhci_hub_status_data: stopping
>> port polling.
>>
>> **********************************************************************************************************************
>>
>> dmesg.4.12-rc1.with_dyndbg_pendrive_connected_at_boot_2n
>>
>> [    0.000000] Linux version 4.12.0-041200rc1-generic (kernel@gomeisa)
>> (gcc version 6.3.0 20170510 (Ubuntu 6.3.0-17ubuntu1) ) #201705131731
>> SMP Sat May 13 21:48:41 UTC 2017
>
>
>> [    4.097413] xhci_hcd 0000:02:00.0: xHCI Host Controller
>> [    4.097433] xhci_hcd 0000:02:00.0: new USB bus registered, assigned
>> bus number 2
>> [    4.178095] xhci_hcd 0000:02:00.0: xHCI capability registers at
>> f8452000:
>> [    4.188170] xhci_hcd 0000:02:00.0: CAPLENGTH AND HCIVERSION 0xffffffff:
>> [    4.188175] xhci_hcd 0000:02:00.0: CAPLENGTH: 0xff
>> [    4.188180] xhci_hcd 0000:02:00.0: HCIVERSION: 0xffff
>> [    4.198256] xhci_hcd 0000:02:00.0: HCSPARAMS 1: 0xffffffff
>> [    4.198261] xhci_hcd 0000:02:00.0:   Max device slots: 255
>> [    4.198265] xhci_hcd 0000:02:00.0:   Max interrupters: 2047
>> [    4.198270] xhci_hcd 0000:02:00.0:   Max ports: 127
>> [    4.208346] xhci_hcd 0000:02:00.0: HCSPARAMS 2: 0xffffffff
>
>
> Ok this second case we fail completely to read any xhci register, they all
> return 0xffffffff
> This is what it would look it xhci controller disappeared completely from
> PCI bus
>
> So first case looks like messed up PCI interrupts (MSI/MSI-X) and second one
> looks
> like reading registers fail completely for this PCI device.
>
> -Mathias
>
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