EHCI / pci power state / suspend annoying interactions
From: Olivier Galibert (galibert_at_pobox.com)
Date: 07/31/04
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Date: Sat, 31 Jul 2004 14:19:44 +0200 To: "Hack inc." <linux-kernel@vger.kernel.org>
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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