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

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Message-Id: <1479246456-21652-1-git-send-email-john.stultz@linaro.org>
Date:   Tue, 15 Nov 2016 13:47:33 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        John Youn <johnyoun@...opsys.com>,
        Douglas Anderson <dianders@...omium.org>,
        Chen Yu <chenyu56@...wei.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: [RFC][PATCH 0/3] DWC2 fixes and hacks to make things work on HiKey

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@...ilicon.com>
Cc: Guodong Xu <guodong.xu@...aro.org>
Cc: Amit Pundir <amit.pundir@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: John Youn <johnyoun@...opsys.com>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Chen Yu <chenyu56@...wei.com>
Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org

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(+)

-- 
2.7.4