Re: PCI not restored correctly after suspend to ram

[Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

On Thu, 2004-03-18 at 03:35, Stefan Dösinger wrote:
...
> I can get most devices devies to work by setting the pci registers with setpci 
> after resume. I use the attached fixpci.sh script to do so. I can get my 
> soundcard, the ethernet card(02:02.0) and the wireless(02:04.0) to work. I 
> have not tested firewire(02:07.0). The secound Cardbus bride(02:06.1) seems 
> to have more problems, it's not even listed correctly.
> The file "lspci_after_suspend_fix" contains the output of lspci -vvx after 
> running fixpci.sh
> 
> Restoring the pci registers is a workaround, but I'd like the kernel to handle 
> this so I don't have to unload and reload all modules, especially the 
> soundcard driver.
> 
> It this a acpi bug, a bug in the pci driver or a bug in the drivers for the 
> devices?

Stefan,
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...

cheers,
-Len




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