Re: PCI not restored correctly after suspend to ram

["Stefan Dösinger" <stefandoesinger-RbZlAiThDcE@public.gmane.org>]

Hi,
> Bruno is correct, the PCI config space should be saved and restored by
> the driver's suspend and resume routines.  suspend/resume routines
> typically do other hardware dependent stuff, but your debugging suggests
> that at least for some of these devices, simply saving and restoring pci
> config space (pci_save_state()/pci_restore_state()) may be sufficient.
>
> Time to take a look at the drivers for those devices...

Thank you very much, now the broadcom ethernet card(b44) and the first pcmcia 
bridge resume properly.
I don't need firewire, the ipw2100 driver has no card specific resume code 
right now(the pci part works fine), and the modem only has a closed driver. 
So I'm content with everything except the sound card.

The last remaining problem is the sound card(Intel Corp. 82801DB (ICH4) AC'97 
Audio Controller (rev 03), i810_audio): Any call to pci_enable_device(), 
pci_restore_state() or pci_write_config_X() crashes.

I can revive the card from user mode with setpci. To make pci_enable_device 
succeed, I have to change 3 registers:

#setpci -s 00:1f.5 11.b=0x1c
#setpci -s 00:1f.5 14.b=0xc1
#setpci -s 00:1f.5 15.b=0x18

Calling pci_write_config_byte() from the resume function of the driver caueses 
a lockup. 

What's the function of these registers(11, 14, 15), and why doesn't setpci 
crash?

Thank you very much so far, and I hope you can help me here too.

Cheers,
Stefan

Here's again the pci configuration of the soundcard:

Before suspend:
00:1f.5 Multimedia audio controller: Intel Corp. 82801DB (ICH4) AC'97 Audio 
Controller (rev 03)
	Subsystem: Acer Incorporated [ALI]: Unknown device 001f
	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 B routed to IRQ 10
	Region 0: I/O ports at 1c00 [size=256]
	Region 1: I/O ports at 18c0 [size=64]
	Region 2: Memory at d0000c00 (32-bit, non-prefetchable) [size=512]
	Region 3: Memory at d0000800 (32-bit, non-prefetchable) [size=256]
	Capabilities: [50] 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-
00: 86 80 c5 24 07 00 90 02 03 00 01 04 00 00 00 00
10: 01 1c 00 00 c1 18 00 00 00 0c 00 d0 00 08 00 d0
20: 00 00 00 00 00 00 00 00 00 00 00 00 25 10 1f 00
30: 00 00 00 00 50 00 00 00 00 00 00 00 0a 02 00 00

After suspend:
00:1f.5 Multimedia audio controller: Intel Corp. 82801DB (ICH4) AC'97 Audio 
Controller (rev 03)
	Subsystem: Acer Incorporated [ALI]: Unknown device 001f
	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-
	Interrupt: pin B routed to IRQ 10
	Region 0: I/O ports at 1c00 [disabled] [size=256]
	Region 1: I/O ports at 18c0 [disabled] [size=64]
	Region 2: [virtual] Memory at d0000c00 (32-bit, non-prefetchable) [disabled] 
[size=512]
	Region 3: [virtual] Memory at d0000800 (32-bit, non-prefetchable) [disabled] 
[size=256]
	Capabilities: [50] 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-
00: 86 80 c5 24 00 00 90 02 03 00 01 04 00 00 00 00
10: 01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 25 10 1f 00
30: 00 00 00 00 50 00 00 00 00 00 00 00 00 02 00 00


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