Re: [linux-pm] [RFC PATCH 2/3] PCI: parallel resume for pci devices on bus 0

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On Fri, 2008-12-19 at 23:09 +0800, Alan Stern wrote:
> On Fri, 19 Dec 2008, Zhang Rui wrote:
> 
> > device parallel resume support for PCI devices
> 
> There are some PCI devices which won't work right if they are resumed
> in parallel.  The example I have in mind is a USB host controller
> device with both a high-speed EHCI controller function and some
> companion low/full-speed UHCI or OHCI controller functions.  The EHCI
> driver relies on the fact that the EHCI controller has a higher
> function number and therefore is resumed _after_ the companion
> controllers.
> 
well, I never got this problem before.
is this normal? does this exist on the Intel hardware?
I'd like to do some test if I have chance.

> We need a way to express dependencies like this between devices.  Or at 
> least, there has to be a way to prevent certain devices from resuming 
> in parallel.
> 
agree.
Just like the case above, can you give me a lspci output and show me
what exactly the dependency is?

thanks,
rui

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