linux-kernel - Re: [RESEND x2][PATCH 0/3] dwc2 fixes for edge cases on hikey

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Date:   Mon, 9 Oct 2017 14:50:24 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Cc:     John Youn <John.Youn@...opsys.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        YongQin Liu <yongqin.liu@...aro.org>,
        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" <linux-usb@...r.kernel.org>
Subject: Re: [RESEND x2][PATCH 0/3] dwc2 fixes for edge cases on hikey

On Tue, Oct 3, 2017 at 2:58 AM, Minas Harutyunyan
<Minas.Harutyunyan@...opsys.com> wrote:
>
> Could you please apply patch from Vardan Mikayelyan "usb: dwc2: Fix
> dwc2_hsotg_core_init_disconnected()" submitted at 02/25/2017
> (https://marc.info/?l=linux-usb&m=148801589931039&w=2) instead of your
> "usb: dwc2: Improve gadget state disconnection handling" and test again
> failing scenario.

I may be misunderstanding htings, but I don't believe that patch
addresses the same issue I'm trying to fix (I've tested with it, and
it doesn't cause any trouble for me, but it also doesn't seem to
address the corner-cases I'm hitting).

My "Improve gadget state disconnection handling" patch handles the
fact that when we switch from B/gadget mode to A/Host mode, we don't
always go through a gadget disconnect path.

So instead of calling the dwc2_hsotg_disconnect() path initially when
switching to gadget mode (to avoid the state complaining that we set
it up twice), we should instead be calling dwc2_hsotg_disconnect()
when we are setting up the A/host mode.

So for example, the follow-on fix to the UDC state won't properly work
without my "Improve gadget state disconnection handling" patch, and
"cat /sys/class/udc/f72c0000.usb/state" will always return configured
(assuming gadget mode was used once) regardless of the gadget state,
since we don't actually call dwc2_hsotg_disconnect when the otg plug
is removed.

> Other 2 patches from series "[PATCH 0/3] dwc2 fixes for edge cases on
> hikey" are Ok.

Thanks for the review/feedback!

thanks
-john