usb: dwc3: implement runtime PM

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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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This commit is contained in:

Felipe Balbi 2016-05-16 13:14:48 +03:00

parent 4cb4221764

commit fc8bb91bc8

3 changed files with 174 additions and 15 deletions

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160

drivers/usb/dwc3/core.c

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9

drivers/usb/dwc3/core.h

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32

drivers/usb/dwc3/gadget.c

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