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Date: Fri, 07 Apr 2017 22:58:12 +0200
From: Paul Menzel <pmenzel@molgen.mpg.de>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
        "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>,
        tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
        GNUtoo@no-log.org, Arthur Heymans <arthur@aheymans.xyz>
Subject: Re: [tpmdd-devel] Regression between Linux 3.16 and 4.8/4.9 on Lenovo
 X60 with coreboot
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Dear Jarkko,


On 2017-04-07 22:13, Jarkko Sakkinen wrote:
> On Thu, Apr 06, 2017 at 01:10:13PM -0600, Jason Gunthorpe wrote:
>> On Thu, Apr 06, 2017 at 08:26:22PM +0200, Paul Menzel wrote:
>> > >We added direct ACPI binding to the driver in addition to PNP, so if
>> > >you have an ACPI table it goes down that path and does some additional
>> > >validation of what is in the TPM. The BIOS must provide a
>> > >acpi_dev_resource_memory and a ACPI_SIG_TPM2 for the ACPI entry at a
>> > >minimum.
>> >
>> > Is it correct, that this is added in/for 4.11, so just recently? Testing
>> > with Linux 4.10.8, everything is detected just fine.
>> 
>> No, it is quite a bit older.. And it should only go for TPM2, which I
>> don't think you have??
>> 
>> Maybe Jarkko has a guess, but sure sounds like something is recently
>> broken in 4.11
>> 
>> Jason
> 
> I'll come back to this. I have to re-read the whole mail thread to
> get back into the context. Lots of multitasking because of release
> and so forth. Sorry for the latency!

I started bisecting this issue. This is the current state.

```
# git bisect log
# bad: [7a771ceac771d009f7203c40b256b0608d7ea2f8] Merge tag 
'dm-4.11-changes' of 
git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
# good: [c470abd4fde40ea6a0846a2beab642a578c0b8cd] Linux 4.10
git bisect start 'HEAD' 'v4.10'
# good: [b3de5ad688f0f52457e73767f95a640ab4158d0d] Merge tag 
'regmap-v4.11' of 
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
git bisect good b3de5ad688f0f52457e73767f95a640ab4158d0d
```


Kind regards,

Paul