Re: [PATCH] xhci: Fix USB 3.1 enumeration issues by increasing roothub power-on-good delay

[Walt Jr. Brake]

On 6/11/2021 00:09, Mathias Nyman wrote:
> On 5.11.2021 18.00, Mathias Nyman wrote:
> > Some USB 3.1 enumeration issues were reported after the hub driver removed
> > the minimum 100ms limit for the power-on-good delay.
> >
> > Since commit 90d28fb53d4a ("usb: core: reduce power-on-good delay time of
> > root hub") the hub driver sets the power-on-delay based on the
> > bPwrOn2PwrGood value in the hub descriptor.
> >
> > xhci driver has a 20ms bPwrOn2PwrGood value for both roothubs based
> > on xhci spec section 5.4.8, but it's clearly not enough for the
> > USB 3.1 devices, causing enumeration issues.
> >
> > Tests indicate full 100ms delay is needed.
> >
> > Reported-by: Walt Jr. Brake <mr.yming81@xxxxxxxxx>
> > Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
> Walt Jr Brake, just to be sure could you test this one as well?
>
> As Alan suggested this sets 100ms for the USB 3 roothub but
> keeps the 20ms for the USB 2 roothub.
>
> Thanks
> -Mathias

Yes I tested, it works too.