MX28 poweroff issue

[Lothar Waßmann]

Hi,

Russell King - ARM Linux writes:
> On Fri, Jul 06, 2012 at 12:08:58AM +0800, Shawn Guo wrote:
> > On Wed, Jul 04, 2012 at 04:19:44PM +0100, Russell King - ARM Linux wrote:
> > > If it's specific to mx28 and mx23 and nothing else, the cause needs to
> > > be found.  Maybe we need it tested on other (non-MX) platforms too?
> > 
> > Though people reported that imx27 does not have the problem, I'm not
> > so sure about it's a mach-mxs (mx23 and mx28) specific issue.  I have
> > not figured it out why imx27 does not run into it, but I got some
> > finding here.
> > 
> > Let's look at the dump again.
> > 
> > [   59.840000] System halted.
> > [   84.100000] BUG: soft lockup - CPU#0 stuck for 23s! [halt:584]
> > ...
> > [   84.100000] [<c0070cd4>] (watchdog_timer_fn+0x114/0x14c) from [<c004052c>]
> > (__run_hrtimer+0x7c/0x1ec)
> > 
> > It reports the issue eventually in function watchdog_timer_fn
> > (kernel/watchdog.c):
> 
> Yes, the general idea is that if the timer is running, and the watchdog
> is running, and it detects that it's event thread doesn't occasionally
> run, it will report a lockup.
> 
> As other platforms seem to not exhibit the problem when we halt, and
> endlessly spin with IRQs enabled, the question needs to be asked: what
> is different with MX23/MX28 and why is it different.
> 
I could reproduce this on an i.MX53 (TX53) platform too. Maybe the
softlockup watchdog was not enabled on those platforms which didn't
show this behaviour.


Lothar Waßmann
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