[RFC][PATCH 0/3] DWC2 fixes and hacks to make things work on HiKey

[John Stultz]

Hey folks,
  I wanted to send out these patches again for comment.
These three patches are basically required to get otg/gadget
mode working reliably on HiKey.

I admit they do feel a bit hackish, but without them we run
into a number of problems related to autosuspend and incorrect
connection state handling.

So I wanted to resend these for feedback and guidance.

I suspect that some of these issues may be due to the phy driver
on hikey being somewhat minimal:
https://git.linaro.org/people/john.stultz/android-dev.git/plain/drivers/phy/phy-hi6220-usb.c?h=dev/hikey-mainline-WIP

So I've tried to hacked together extconn support into the phy
driver, and I'm getting phy notifications, but I've not yet
sorted out how to get the phy->gadget signaling to work
properly (or if my appraoch is even correct).

See: 
https://git.linaro.org/people/john.stultz/android-dev.git/commit/?h=dev/hikey-mainline-WIP&id=c608f263240f7c54dbf5439f2210cba1ab8e0136

I've had a difficult time trying to understand how the
usb contoller driver, phy driver and extcon shoudl properly
fit together, and I'm not sure what would be a good reference
driver to follow.

So suggestions or pointers here would be greatly appreciated.

Cc: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Cc: Guodong Xu <guodong.xu@xxxxxxxxxx>
Cc: Amit Pundir <amit.pundir@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: John Youn <johnyoun@xxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Chen Yu <chenyu56@xxxxxxxxxx>
Cc: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx

Chen Yu (1):
  usb: dwc2: Force port resume on switching to device mode

John Stultz (2):
  usb: dwc2: Avoid suspending if we're in gadget mode
  usb: dwc2: Make sure we disconnect the gadget state

 drivers/usb/dwc2/hcd.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

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2.7.4