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 14:12:58 +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

> > Dear Tomas,
> >
> >
> > 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, 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


Thanks
Tmas