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SubjectRe: Missing USB XHCI and EHCI reset for kexec
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Am Montag, den 14.04.2014, 13:58 -0400 schrieb Alan Stern:
> On Mon, 14 Apr 2014, Stefani Seibold wrote:
>
> > > > An other PowerPC device which is nearly eactly the same HW but without
> > > > this USB HUB works perfectly.
> > >
> > > Maybe you should replace that hub with a different brand.
> > >
> >
> > Thats not possible, because the Hub is soldered on the board. And it is
> > also not a HW issue, since the Hub works perfectly which all previous
> > kernels including 3.4.
>
> One other thing you can try is to increase the reset timeout in
> drivers/usb/host/ehci-hub.c. This is under the USB_PORT_FEAT_RESET
> case in ehci_hub_control(), around line 1225:
>
> /*
> * caller must wait, then call GetPortStatus
> * usb 2.0 spec says 50 ms resets on root
> */
> ehci->reset_done [wIndex] = jiffies
> + msecs_to_jiffies (50);
>
> Increasing the 50 to 100 or more might help.
>
> Alan Stern
>

I tried this, when i increase the value to 1000, the reset and
enumeration process will be faster after a kexec: 28 Seconds vs. 162
Seconds.

- Stefani



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