Re: [tpmdd-devel] Regression between Linux 3.16 and 4.8/4.9 on Lenovo X60 with coreboot

["Maciej S. Szmigiero" <mail@maciej.szmigiero.name>]

On 04/06/17 08:18, Paul Menzel wrote:
> 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?

Unfortunately I can't help here as I am just a normal TPM user who
happened to hit and fix that timeouts regression, but maybe others
on ML will know something more about it.

> Kind regards,
> 
> Paul

Best regards,
Maciej