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

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Message-ID: <5549d8c0527412390d71236d80dff419@molgen.mpg.de>
Date:   Sat, 14 Jan 2017 20:27:31 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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

Dear Greg,


On 2017-01-13 14:00, Greg Kroah-Hartman wrote:
> On Wed, Jan 11, 2017 at 03:26:06PM +0100, Paul Menzel wrote:

>> 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 :(

Which system do you have?

> Did you get anywhere with your bisection?

Sorry, I replied to a different message with my status.

Please see my status below. I’ll have access to the machine on Monday 
again.

```
$ git bisect log
git bisect start
# good: [69973b830859bc6529a7a0468ba0d80ee5117826] Linux 4.9
git bisect good 69973b830859bc6529a7a0468ba0d80ee5117826
# good: [69973b830859bc6529a7a0468ba0d80ee5117826] Linux 4.9
git bisect good 69973b830859bc6529a7a0468ba0d80ee5117826
# bad: [a121103c922847ba5010819a3f250f1f7fc84ab8] Linux 4.10-⁠rc3
git bisect bad a121103c922847ba5010819a3f250f1f7fc84ab8
# bad: [72cca7baf4fba777b8ab770b902cf2e08941773f] Merge tag 
'staging-4.10-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect bad 72cca7baf4fba777b8ab770b902cf2e08941773f
# good: [b8d2798f32785398fcd1c48ea80c0c6c5ab88537] Merge tag 
'clk-for-linus' of 
git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
git bisect good b8d2798f32785398fcd1c48ea80c0c6c5ab88537
# good: [9439b3710df688d853eb6cb4851256f2c92b1797] Merge tag 
'drm-for-v4.10' of git://people.freedesktop.org/~airlied/linux
git bisect good 9439b3710df688d853eb6cb4851256f2c92b1797
```


Kind regards,

Paul