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Date: Thu, 06 Apr 2017 08:18:33 +0200
From: Paul Menzel <pmenzel@molgen.mpg.de>
To: "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc: jgunthorpe@obsidianresearch.com, tpmdd-devel@lists.sourceforge.net,
        linux-kernel@vger.kernel.org, GNUtoo@no-log.org
Subject: Re: [tpmdd-devel] Regression between Linux 3.16 and 4.8/4.9 on Lenovo
 X60 with coreboot
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Dear Maciej,


On 2017-04-05 13:03, Maciej S. Szmigiero wrote:

>> tpm tpm0: Unable to read burstcount
>> tpm tpm0: tpm_transmit: tpm_send: error -16
>> tpm_tis tpm_tis: Could not get TPM timeouts and durations
> 
> This looks like a regression I had on ThinkPad X61S.
> 
> You can try with a patch from the following commit
> which fixed it for me:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1d70fe9d9c3a4c627f9757cbba5d628687b121c1
> 
> It is included in mainline kernel 4.10.2.

Indeed, that improves the situation. I still need to pass `force=1` to 
the module to get `/dev/tpm0`. No idea, why it’s not in included in 
Linux 4.9 yet.

```
$ more /proc/version
Linux version 4.11.0-rc5+ (root@d44d03a193d6) (gcc version 6.3.0 
20170321 (Debian 6.3.0-10) ) #2 SMP Tue Apr 4 21:07:08 UTC 2017
$ journalctl -k -o cat | grep tpm
tpm_tis tpm_tis: 1.2 TPM (device-id 0x3202, rev-id 5)
tpm tpm0: Issuing TPM_STARTUP
tpm tpm0: [Hardware Error]: Adjusting reported timeouts: A 
10000->10000us B 10000->10000us C 0->752000us D 0->752000us
$ more /sys/class/tpm/tpm0/device/caps
Manufacturer: 0x41544d4c
TCG version: 1.2
Firmware version: 11.5
$ sudo tpm_version
Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17), 
Communication failure
```

So do you have an idea, what “ACPI requirements” changed in the `tpm` 
module since Linux 3.16 to be loaded automatically?


Kind regards,

Paul