On Tue, 29 Jan 2013, Vivek Gautam wrote:
> This change de-asserts vbus_gpio on suspend and
> re-asserts on resume in order to save power.
> NOTE, this change means no USB charging in suspend
> mode.
Doing this would mean USB devices could not wake up the system. This
would be unacceptable.
However, turning off VBUS power is okay provided:
no root-hub ports are enabled, and
the root hub is not enabled for wakeup.
Under those circumstances there can't be any wakeup-enabled USB devices
on the bus, and the root hub itself would not need to detect new
connections and disconnections.
Alan Stern
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