[U-Boot] USB power is not enabled fro BeagleBone Black

[Sergey Manucharian <sm@ara-ler.com>]

New findings:

The problem is different, it happens only with USB 3 flash drives, USB 2
devices are powered properly. I don't have real statistics, but the
newest SanDisk's drives won't work.

However, it's hard to believe that a tiny USB drive requests more than
500mA to assume that the controller and/or u-boot decide to not provide
power to it.

Sergey

Excerpts from Lokesh Vutla's message from Mon 10-Jul-17 18:47:
> 
> 
> On 7/8/2017 8:50 AM, Sergey Manucharian wrote:
> > (sorry for top posting, sending from a phone)
> > 
> > I would agree it's intentional at the first stage: we don't want to power external devices which we may not need, however, the "usb start" command must enable it, otherwise it's useless...
> 
> Right. Any chance you bisected to the commit which caused the issue?
> 
> Thanks and regards,
> Lokesh
> 
> > 
> > -S.
> >   Original Message  
> > From: Tom Rini
> > Sent: Friday, July 7, 2017 18:41
> > To: sm; Lokesh Vutla
> > Cc: u-boot at lists.denx.de
> > Subject: Re: [U-Boot] USB power is not enabled fro BeagleBone Black
> > 
> > On Sat, Jul 01, 2017 at 12:51:41PM -0700, sm wrote:
> > 
> >> Hi all,
> >>
> >> The latest git version does not turn on USB power on BeagleBone Black:
> >> "usb start" reports that the port is not accessible, but with external
> >> power provided it detects the plugged in device.
> > 
> > Yes, I think this may be intentional?
> >