Re: Odroid U2 Kernel 4.7rc7+ Hang on reboot

[Marian Mihailescu <mihailescu2m@gmail.com>]

Krzysztof Kozlowski <k.kozlowski <at> samsung.com> writes:

> 
> On 07/15/2016 05:56 PM, Nicolas Dufresne wrote:
> > Le vendredi 15 juillet 2016 à 16:33 +0200, Tobias Jakobi a écrit :
> >> I can confirm that this indeed doesn't work.
> >>
> >> chidori ~ # echo 1 > /proc/sys/kernel/sysrq
> >> chidori ~ # echo s > /proc/sysrq-trigger
> >> chidori ~ # echo u > /proc/sysrq-trigger
> >> chidori ~ # echo b > /proc/sysrq-trigger
> >> <board hangs, only red power LED on>
> >>
> >> I guess Nicolas is seeing a different or another problem here 
though.
> > 
> > Well for me both method hangs. On an extra note, reset inside Uboot
> > works, but reboot in Linux hang. I tried adding a trace
> > in syscon_restart_handle(), but the trace is never displayed. I'm
> > wondering if that handler is ever called, or if it's just that the
> > serial console was shut down already.
> > 
> > Any idea what else should I trace ?
> 
> This is weird... reboot should work. Just to confirm it - can you test
> following patch in both scenarios (this should fix both of them... at
> least on Odroid U3 but your board might have different SPL/BL1):
> 

Hi Krzysztof,

Thanks for looking into this.
While Nicolas is away, I can do whatever testing you need.
I can confirm that with this patch, I can now reboot both from tty1 and 
ttySAC1. I haven't done any extensive testing, but I could reboot 
without issues several times in a row.

I do remember with previous kernels (even 3.x) there would be issues 
with reboot if the governor was anything else than performance. This is 
why my config only has performance enabled - but I was still having 
reboot issues. Do you expect using performance gov + this patch to fully 
solve the reboot issue?

Thanks,
Marian