pci bridge suspend/resume (Re: PCI not restored correctly after suspend to ram)

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

Linux PCI list,

Stefan noticed bits changing in the config space for
his PCI/PCI bridge across a C3 suspend/resume.

Is there any software in Linux responsible for preserving
and restoring the PCI config space for PCI/PCI bridges
across a suspend/resume?

thanks,
-Len


--------
> 00:1e.0 PCI bridge: Intel Corp. 82801BAM/CAM PCI Bridge (rev 83)
(prog-if 00 [Normal decode])

- 00: 86 80 48 24 07 01 80 88 83 00 04 06 00 00 01 00
+ 00: 86 80 48 24 05 01 80 80 83 00 04 06 00 00 01 00

byte 4 bit 1 is memory access enable.
I suspect it is a bug that this went away across suspend/resume.

byte 7 bit2 is Target abort in the status register --
benign I think -- we can't set this bit anyway.

- 10: 00 00 00 00 00 00 00 00 00 02 02 40 40 40 80 32
+ 10: 00 00 00 00 00 00 00 00 00 02 02 40 40 40 80 22

byte 31 bit 4 is bit 12 of the bridge secondary status register --
target abort -- which we can't set and is 0 after reset,
so this one looks benign also.





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