Re: About current state of supporting USB selective suspend feature

Our device's enumeration has four phases:
1,report vid/pid 0xaaaa/0xbbbb
2,broken from host after 10 seconds
3,report vid/pid 0xcccc/0xdddd
4,working now
In fedora 7, our device stoped at phase 1. I don't know why.


Abei





>From: David Brownell <[email protected]>
>To: [email protected]
>CC: "gutian abei" <[email protected]>
>Subject: Re: [linux-usb-devel] About current state of supporting USB 
selective suspend feature
>Date: Fri, 3 Aug 2007 07:17:55 -0700
>
>On Friday 03 August 2007, gutian abei wrote:
> > I am trying to develop a USB device driver in Linux platform.
> > Our device has the ability of re-enumeration.
>
>Like the Cypress chips, which use one device ID before the
>firmware is loaded and then another one later after it restarts
>with that new firmware?  The "fxload" tool can be used to put
>new firmware into those devices.
>
>
> > That is when our device plug
> > into host PC it reports a vid/pid, for example 0xaaaa/0xbbbb, after 10 
?> > seconds it ?changes the state of D+ and D- ?to let PC enumerate 
it
> > again, and it reports a new vid/pid, for example 0xcccc/0xdddd.
> > Then our device uses 0xcccc/0xdddd to play with host PC.
>
>So the question is:  Why doesn't it come up as cccc/dddd in
>the first place?  If it just randomly decides to switch IDs,
>it sounds like "broken by design" hardware.  But I suspect
>there's actually a purpose to it ... one which you don't yet
>understand.
>
>
> > But in my Fedora 7 system(I install it today, not update yet!), it 
doesn't
> > enumerate the second vid/pid. It just enumerate the first
> > vid/pid(0xaaaa/0xbbbb). I use usbview tool to test my device.
> > Does anyone have experience to resolve it?
>
>So this question doesn't have even the least bit to do with
>selective suspend, then.  Use accurate $SUBJECT lines.

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