[U-Boot] [PATCH 2/7] usb: hub: Conditionally power on usb's root-hub ports

[Marek Vasut]

Dear Vivek Gautam,

> Power on root hubs' ports only when they are not yet powered on.
> Its seen with USB 3.0 ports that they are powered on after
> a H/W reset, as also reflected in XHCI spec (sec 4.3):
> "After a Chip Hardware Reset, HCRST, or commanded to the
> PLS = RxDetect state, all Root Hub ports shall be in Disconnected
> state, i.e. the port is powered on (PP = 1)"
> 
> Signed-off-by: Amar <amarendra.xt at samsung.com>
> Signed-off-by: Vivek Gautam <gautam.vivek at samsung.com>

Just wondering if we shouldn't power-cycle all the ports instead -- aka. turn 
them off and then turn all of them on again.

Best regards,
Marek Vasut