Re: Resuming rt73usb wireless network dongle: ep0in 3strikes

On Mon, 2007-09-03 at 11:43 -0400, Alan Stern wrote:
> I counted about 500 occurrences!  That seems a little extreme.  If the 
> transfer doesn't succeed after a couple of retries, it hardly seems 
> likely that another 498 will help.  Don't you think that could be cut 
> down a bit?

Sure, the resume handler should error out properly, this needs to be
fixed.

> 
> > So what's the problem here? Is this a know problem? Is the resume
> > handler incorrect? Or maybe the device cannot resume properly and needs
> > to be blacklisted? All comments and suggestions welcome.
> 
> The problem is that either your device or else the EHCI controller it 
> is attached to dropped the USB connection during the suspend.  The 
> same thing happened to the Alcor Micro mass storage device attached to 
> the same controller, which suggests the problem lies in the controller.  
> Or maybe it lies in the BIOS, which could reset the controller during 
> the initial stages of resuming.

Just for my understanding: Do you mean the system BIOS or some firmware
in the ICH8? Note that I'm *not* doing a complete software-suspend
cycle, but only a test run (cause I write "test" to /sys/power/disk).
How could the system BIOS be involved when the EHCI controller
suspends/resumes without actually rebooting the machine?

Another question: If the controller drops the connection, shouldn't the
ehci driver just do a reconnect instead of trying to resume the
interface driver? And how does CONFIG_USB_PERSIST relate to all that?

> The fact that the device survived the first round of tests indicates 
> your driver is basically OK.
> 
> You might try connecting the device to your other EHCI controller, the 
> one on the add-on PCI card.  The BIOS is less likely to interfere with 
> that one since it isn't built into the motherboard.

Yeah, we're already running tests on different chipsets/motherboards.
Note that my other EHCI is also part of the same ICH8. I'll try, but I
doubt I'll get different results.

Mattias


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