Felipe Balbi fc8bb91bc8
usb: dwc3: implement runtime PM ...
this patch implements the most basic pm_runtime
support for dwc3. Whenever USB cable is dettached,
then we will allow core to runtime_suspend.
Runtime suspending will involve completely tearing
down event buffers and require a full soft-reset of
the IP.
Note that a further optimization could be
implemented once we decide to support hibernation,
which is to allow runtime_suspend with cable
connected when bus is in U3. That's subject to a
separate patch, however.
Tested-by: Baolin Wang <baolin.wang@linaro.org >
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com >
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