linux-kernel - Re: Suspend-resume failure on Intel Eagle Lake Core2Duo

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Date:   Thu, 27 Jul 2017 22:13:18 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tomi Sarvela <tomi.p.sarvela@...el.com>
cc:     Martin Peres <martin.peres@...ux.intel.com>,
        jeffy.chen@...k-chips.com, linux-kernel@...r.kernel.org
Subject: Re: Suspend-resume failure on Intel Eagle Lake Core2Duo

On Thu, 27 Jul 2017, Thomas Gleixner wrote:
> On Thu, 27 Jul 2017, Tomi Sarvela wrote:
> 
> > On 27/07/17 10:42, Thomas Gleixner wrote:
> > > On Thu, 27 Jul 2017, Tomi Sarvela wrote:
> > > > On 26/07/17 17:26, Thomas Gleixner wrote:
> > > > > So reverting that commit does not help. Does it help on your machine?
> > > > 
> > > > Yes. Reverting it does not cause the machine to lock up on resume.
> > > > 
> > > > I haven't tested if the machine locks up later on, but at least it
> > > > survives
> > > > couple of s/r cycles.
> > > 
> > > Can you please try to add 'nohpet' to the kernel command line?
> > 
> > Option nohpet didn't change anything, still hangs on s/r.
> 
> Ok. Was a shot in the dark. I tried on a similar machine, but that one
> resumes fine (except that the AHCI controller plays silly buggers, but
> nothing interrupt related). I might have access to another core2duo machine
> tomorrow.
> 
> I'll send you a debug patch shortly, but can you please first check when
> the wreckage happens by testing the states in
> 
>     /sys/power/pm_test
> 
> freezer
> devices
> platform
> processors
> core

Actually for suspend to ram we only have

	 freezer, devices, platform

I assume it's platform because that is where the actual interrupt
suspend/resume happens.

If that survives, then it's the low level architecture s/r code which
fiddles with the interrupt controllers and leaves them in a state which is
not known to the core code.

Thanks,

	tglx