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    SubjectRe: Suspending and resuming a single PCI device (and bridge)
    I've got a wireless card (atheros 5418 on a MacBookPro3,1) which is
    (kind-of) supported by the madwifi driver (from head), however
    occasionally it gets stuck (long outstanding bug with lots of
    comments, but no fixes) - I've noticed that a suspend to ram and
    resume (almost?) always fixes the problem.

    Thus, I'm wondering if there is a way to cause a pci device (and
    possibly the pci bridge/port it's connected to) to suspend/resume
    manually (or naturally, any other solution to the problem)...

    The hardware in question:

    # lspci -t | egrep 0b; lspci -vvnn -s 00:1c.4; lspci -vvnn -s 0b:00.0

    +-1c.4-[0000:0b]----00.0

    00:1c.4 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI
    Express Port 5 [8086:2847] (rev 03) (prog-if 00 [Normal decode])
    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: 256 bytes
    Bus: primary=00, secondary=0b, subordinate=0b, sec-latency=0
    Memory behind bridge: d7300000-d73fffff
    Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
    <TAbort- <MAbort- <SERR- <PERR-
    BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
    PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
    Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
    DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
    unlimited, L1 unlimited
    ExtTag- RBE+ FLReset-
    DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
    Unsupported-
    RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
    MaxPayload 128 bytes, MaxReadReq 128 bytes
    DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
    AuxPwr+ TransPend-
    LnkCap: Port #5, Speed 2.5GT/s, Width x1, ASPM L0s L1,
    Latency L0 <256ns, L1 <4us
    ClockPM- Suprise- LLActRep+ BwNot-
    LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled-
    Retrain- CommClk+
    ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
    LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train-
    SlotClk+ DLActive+ BWMgmt- ABWMgmt-
    SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
    HotPlug+ Surpise+
    Slot # 4, PowerLimit 6.500000; Interlock- NoCompl-
    SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet-
    CmdCplt- HPIrq- LinkChg-
    Control: AttnInd Unknown, PwrInd Unknown,
    Power- Interlock-
    SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt-
    PresDet+ Interlock-
    Changed: MRL- PresDet+ LinkState+
    RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
    PMEIntEna- CRSVisible-
    RootCap: CRSVisible-
    RootSta: PME ReqID 0000, PMEStatus- PMEPending-
    Capabilities: [80] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/0 Enable-
    Address: fee0300c Data: 4179
    Capabilities: [90] Subsystem: Gammagraphx, Inc. Unknown device
    [0000:0000]
    Capabilities: [a0] Power Management version 2
    Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
    PME(D0+,D1-,D2-,D3hot+,D3cold+)
    Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    Kernel driver in use: pcieport-driver
    Kernel modules: shpchp

    0b:00.0 Network controller [0280]: Atheros Communications, Inc. AR5418
    802.11abgn Wireless PCI Express Adapter [168c:0024] (rev 01)
    Subsystem: Apple Computer Inc. Unknown device [106b:0087]
    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: 256 bytes
    Interrupt: pin A routed to IRQ 16
    Region 0: Memory at d7300000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: [40] Power Management version 2
    Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA
    PME(D0+,D1+,D2-,D3hot+,D3cold-)
    Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [50] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/0 Enable-
    Address: 00000000 Data: 0000
    Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00
    DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
    <512ns, L1 <64us
    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 2.5GT/s, Width x1, ASPM L0s L1,
    Latency L0 <512ns, L1 <64us
    ClockPM- Suprise- LLActRep- BwNot-
    LnkCtl: ASPM L1 Enabled; RCB 128 bytes Disabled-
    Retrain- CommClk+
    ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
    LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train-
    SlotClk+ DLActive- BWMgmt- ABWMgmt-
    Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
    Vector table: BAR=0 offset=00000000
    PBA: BAR=0 offset=00000000
    Kernel driver in use: ath_pci
    Kernel modules: ath5k, ath_pci

    When the problem happens, the kernel driver reports:
    kernel: wifi0: ath_rxorn_tasklet: Receive FIFO overrun; resetting.
    kernel:last message repeated 92 times

    I've noticed this seems to be correlated to <MAbort+ being asserted on
    the pci port (00:1c.4) and on the device itself (0b:00.0) - thus I
    think the above message is more of a symptom, than an actual
    problem...

    Does anyone have any ideas (for example how [else] to clear MAbort)?

    This is on kernel 2.6.24.4-74.fc8 from koji for fedora core 8 (also
    present on 2.6.24.3-*.fc8), but people have reported issues on pretty
    much everything (ubuntu, etc), any desired futher information
    available by request...

    Not currently subscribed so please keep me CC'ed.

    Thanks,
    Maciej


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