Re: dwc3 gadget breaks on system suspend/resume

Felipe Balbi
2017-01-27T14:17:02Z

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Hi,

Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> writes:

> Felipe,
>
> On 19/01/17 14:16, Roger Quadros wrote:
>> On 19/01/17 13:59, Felipe Balbi wrote:
>>>
>>> Hi,
>>>
>>> Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> writes:
>>>> Hi Felipe,
>>>>
>>>> We have system suspend resume working on dra7-evm in v4.10-rc but
>>>> dwc3 gadget breaks after system suspend resume.
>>>>
>>>> Any hints how to fix it? Full backtrace below.
>>>
>>> from a quick look. END_TRANSFER is timing out, most likely. Tracepoints
>>> should give better hints.
>>>
>>> We might have a bug in dwc3_gadget_suspend(). No idea what's really
>>> going on.
>>>
>>>> Another message that looks worry-some is
>>>> "[ 61.495313] omap-dwc3 48880000.omap_dwc3_1: runtime PM trying to suspend device but active child"
>>>
>>> did you implement runtime PM on dwc3-omap.c? Look at dwc3-pci.c for reference.
>>>
>>>> If I unload gadget, then suspend/resume system then load gadget everything works fine.
>>>
>>> right, dwc3 UDC will already have been toredown. Unfortunately I can't
>>> spend a lot of time on this, so you're gonna have to try to fix it and
>>> provide a patch :-s Quite busy looking at some f_fs weirdness.
>>
>> No problem. I'll debug this issue.
>
> Bisected to bad commit 4eb3d981e7344ded9e5a8725ed934dd8f8056daf "usb: dwc3: core: simplify suspend/resume operations".

$ git show 4eb3d981e7344ded9e5a8725ed934dd8f8056daf
fatal: bad object 4eb3d981e7344ded9e5a8725ed934dd8f8056daf

That commit to me is:

commit 51f5d49ad6f011ee380b866ea617fd90584189a2
Author: Felipe Balbi <felipe.balbi-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Date: Mon May 16 10:52:58 2016 +0300

usb: dwc3: core: simplify suspend/resume operations

now that we have re-factored dwc3_core_init() and
dwc3_core_exit() we can use them for suspend/resume
operations.

This will help us avoid some common mistakes when
patching code when we have duplicated pieces of code
doing the same thing.

Signed-off-by: Felipe Balbi <felipe.balbi-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

Can you please try actual mainline and not some tree where you
cherry-picked patches on top? ;-)

--
balbi

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