linux-kernel - RE: [char-misc for 4.10-rc4 V2] mei: bus: enable OS version only for SPT and newer

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Date:   Wed, 11 Jan 2017 16:10:05 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
CC:     Jan Niehusmann <jan@...dor.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Chen, Yu C" <yu.c.chen@...el.com>,
        "Sarvela, Tomi P" <tomi.p.sarvela@...el.com>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Daniel Blueman <daniel@...ra.org>,
        "Brown, Len" <len.brown@...el.com>
Subject: RE: [char-misc for 4.10-rc4 V2] mei: bus: enable OS version only
 for SPT and newer


> On 01/11/17 15:12, Winkler, Tomas wrote:
> 
> >>> On 01/11/17 10:24, Winkler, Tomas wrote:
> >>>>>
> >>>>> On Wed, Jan 11, 2017 at 01:27:21AM +0200, Tomas Winkler wrote:
> >>>>>> On older platforms the command should be just ignored by the
> >>>>>> firmware but some older platforms misbehave so it's safer to send
> >>>>>> the command only if required.
> >>>>>
> >>>>> Thanks! This fixes suspend-to-ram for me (on a Thinkpad x201s).
> >>>>
> >>>> What about Dell XPS13?
> >>>
> >>> With Linus' master branch from today, and Greg's char-misc-linus
> >>> merged
> >>> (Merge: 807b93e995d1 546cf3ef9c92), the regression is still there.
> >>
> >> Hmm, this should work on KBL....
> >>
> >>> I am now building a Linux kernel image with the two commits touching
> >>> `bus- fixup.c` reverted.
> >>
> >> Thanks for the effort.
> >>
> >>> Do you want me to open a separate bug report for that, or continue
> >>> debugging in the existing report [1], which is currently marked as resolved?
> >>
> >> Let's get some more data, shouldn't take long time.
> >>>
> >>> Do you have Kaby Lake devices sitting around for testing?
> >>
> >> We will of course try to reproduce the issue locally.
> >
> > Paul, currently we cannot reproduce this issue on Kaby Lake platforms
> > on our side,
> 
> It looks like it's a different issue. Reverting the two commits touching `bus-
> fixup.c`, did not help.
> 
> > we would be great for more debug data from your side.
> > You can get more info by enabling  mode debug logs
> >
> > echo -n 'module mei +lfp' > /sys/kernel/debug/dynamic_debug/control
> > echo -n 'module mei_me +lfp' > /sys/kernel/debug/dynamic_debug/control
> 
> I am currently bisecting to find the culprit. 13 steps will take some time
> though.
> 
> Tomas, I believe Intel's "ACPI department" got access to a Dell XPS13.
> 
> 
> Kind regards,
> 
Thanks for updated, really appreciated your engagement.  I believe this closes the issue from MEI side.
I'll be watching this ACPI issue as well. 
Thanks
Tomas