EHCI / pci power state / suspend annoying interactions

[Olivier Galibert]

The EHCI on the latitude x300 does not have D2 capability:

00:1d.7 USB Controller: Intel Corp. 82801DB (ICH4) USB2 EHCI Controller (rev 01) (prog-if 20 [EHCI])
        Subsystem: Dell Computer Corporation: Unknown device 014f
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin D routed to IRQ 10
        Region 0: Memory at e0100000 (32-bit, non-prefetchable)
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
   

That fails suspend-to-ram because dev->suspend which is
usb_hcd_pci_suspend calls pci_set_power_state to request level D2,
which fails with -EIO.  The error is propagated back and the suspend
aborts.  What should actually happen in that case?

  OG.
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