Re: wlcore getting stuck on hikey after the runtime PM autosuspend support change

[Tony Lindgren <tony@atomide.com>]

* John Stultz <john.stultz@linaro.org> [181211 19:51]:
> On Tue, Dec 11, 2018 at 11:25 AM Ricardo Salveti <rsalveti@rsalveti.net> wrote:
> > Then tried to reproduce with a simple 'while true; do ip link set dev
> > wlan0 down; ip link set dev wlan0 up; done;' and it was already enough
> > to cause the same hang. Adding a simple sleep 1 after down/up is
> > already enough to make it work, so something might be missing during
> > the down/up process that only happens when they get called right after
> > the other.

With while true test above, I'm getting:

wlcore: ERROR timeout waiting for the hardware to complete initialization

Then after ctrl-c, wlan0 connects to the access point just fine
for me.

Is that what you're seeing or some oops?

> > And it works fine with NetworkManager when I disable MAC address
> > randomization simply because it only brings the interface up once,
> > avoiding the hang.
> >
> > Will enable debug and try to get a better trace.
> 
> I'm not totally sure you're both seeing the same issue, but if its
> helpful, here's the bug that Anders was working:
> https://bugs.linaro.org/show_bug.cgi?id=3960
> 
> There's some mixing of a separate USB issue that has since been
> resolved. But from the notes in that bug, Anders had possibly isolated
> the wlcore issue down to the following commit:
> https://git.linaro.org/people/anders.roxell/linux.git/commit/?h=tests-lwcore&id=598bfffb593d3fd0e31e790d604b44c9c5df368e
> 
> I wonder if something in that pm_runtime change effects this?

Maybe yeah. Anyways, should be trivial to fix now once we figure
out how to reproduce it manually :)

Regards,

Tony