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:   Fri, 13 Jan 2017 14:00:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Tomas Winkler <tomas.winkler@...el.com>,
        Jan Niehusmann <jan@...dor.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org, Yu C Chen <yu.c.chen@...el.com>,
        Tomi P Sarvela <tomi.p.sarvela@...el.com>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Daniel Blueman <daniel@...ra.org>,
        Len Brown <len.brown@...el.com>
Subject: Re: [char-misc for 4.10-rc4 V2] mei: bus: enable OS version only for
 SPT and newer

On Wed, Jan 11, 2017 at 03:26:06PM +0100, Paul Menzel wrote:
> Dear Tomas,
> 
> 
> 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.

I can duplicate this on my laptop here as well :(

Did you get anywhere with your bisection?

thanks,

greg k-h