> Yes
>
> >> reported as self powered, per port power limit is 500 mA, so the
> >> device may be configured and maybe work normal.
> >>
> >
> > I see your hub report its max power is 100 mA, so if it can report as
> > self powered, then the hub's behavior is correct, and will not be
> > rejected by kernel. And you should get an error message when the
> > device which declares its max power larger than 100mA plugs in hub's port,
> right?
>
> The external hub could be enumerated regardless of it's reported to linux as
> self-powered or bus-powered.
> The difference is that when it's reported as self-powered / bus-powered,
> driver will set the per port power limit to 500 mA / 100 mA. When a usb device
> is attached to one port of the hub, driver will compare the MaxPower of the
> configuration of the device with the hub port power limit, if the MaxPower is
> greater than the port power limit, the configuration will be rejected.
>
> >> But will it cause a runtime error? Say I have a embeded usb host
> >> which can supply 500 mA at most, when the hub reported as self
> >> powered and attached with two devices both with max power equals to
> >> 250 mA. Both device can be configured, but if they are both working
> >> at the most power requirement at the same time, there should be some
> power problem, right?
> >>
So, the current hub code is correct, the Lab will use the well-behavior hub, it should
no problem for this test item, right?
Peter
��.n��������+%������w��{.n�����{���)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
