usb: dwc3: core: add power management support
Add support for basic power management on the dwc3 driver. While there is still lots to improve for full PM support, this minimal patch will already make sure that we survive suspend-to-ram and suspend-to-disk without major issues. Cc: Vikas C Sajjan <vikas.sajjan@linaro.org> Tested-by: NVivek Gautam <gautam.vivek@samsung.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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