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:   Sun, 15 Jan 2017 07:19:03 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Paul Menzel <pmenzel@...gen.mpg.de>
CC:     Jan Niehusmann <jan@...dor.com>,
        "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

> Subject: Re: [char-misc for 4.10-rc4 V2] mei: bus: enable OS version only for SPT
> and newer
> 
> On Sat, Jan 14, 2017 at 08:27:31PM +0100, Paul Menzel wrote:
> > 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?
> 
> A Dell XPS13, don't know what cpu type it is, here's the output of one cpu from
> /proc/cpuinfo
> 
> processor	: 3
> vendor_id	: GenuineIntel
> cpu family	: 6
> model		: 78
> model name	: Intel(R) Core(TM) i7-6560U CPU @ 2.20GHz
> stepping	: 3
> microcode	: 0x8a
> cpu MHz		: 712.207
> cache size	: 4096 KB
> physical id	: 0
> siblings	: 4
> core id		: 1
> cpu cores	: 2
> apicid		: 3
> initial apicid	: 3
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 22
> wp		: yes
> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
> pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl
> xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
> ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic
> movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm
> 3dnowprefetch epb intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase
> tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt
> xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify
> hwp_act_window hwp_epp
> bugs		:
> bogomips	: 4419.34
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 39 bits physical, 48 bits virtual
> power management:
> 
> > > 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
> > ```
> >
> 
> You are close!  I'll try bisection tomorrow if I have some spare time.
> 
> thanks,

Greg,  is that same Laptop mode as Paul's, you've experience the issue on?
Thanks
Tomas