> On Tue, Feb 23, 2016 at 10:20 PM, Peter Chen <[email protected]>
> wrote:
>
> > Oh, you said it is called before.
> >
> > http://www.spinics.net/lists/linux-usb/msg136714.html
>
> Yes, I have enabled runtime pm previously. Sorry for the confusion.
>
> > If you make sure the neither .runtime_suspend at chipidea driver nor
> > mxs_phy_suspend at mxs driver are called, it means the USB HUB can
> > never be suspended, then the kernel command line is the only way.
>
> Yes, passing 'usbcore.autosuspend=-1' is the only reliable method I see so
> far.
>
> > Care to test external USB HUB with i.mx28 evk? I would like to know if
> > it is the HUB's issue. Afaik, i.mx28 has no such bug when the bus is
> > suspended but the PHY is still active.
>
> How do I test this?
Just plug in an external USB HUB at i.mx28 evk host port without pass
''usbcore.autosuspend=-1' at bootargs to see if it works.
Peter
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