linux-kernel - Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

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Message-ID: <4f7cc7152f2266d8d0782889db2375d4c1c71987.camel@mniewoehner.de>
Date:   Wed, 14 Nov 2018 21:46:53 +0100
From:   Michael Niewöhner <linux@...ewoehner.de>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        peterhuewe@....de, jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca,
        arnd@...db.de, linux-integrity@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

Hi all,

I tried that patch mentioned by Mimi but it does not change anything for me.

Then I did some more tests with different kernel configs and finally got TPM
working by
a) compiling TPM as modules and rmmod tpm* and re-modprobe tpm_tis.

(initramfs) dmesg | grep -i tpm
[    0.000000] efi:  ACPI 2.0=0x9ea7e000 ACPI=0x9ea7e000 SMBIOS=0x9f5eb000
SMBIOS 3.0=0x9f5ea000 ESRT=0x9c07d918 MEMATTR=0x9bea3018 TPMEventLog=0x97cbb018
[    0.003793] ACPI: TPM2 0x000000009EAB7F70 000034 (v03 LENOVO TC-
S06   00001260 AMI 00000000)
(initramfs) rmmod tpm_crb tpm_tis tpm_tis_core tpm
(initramfs) modprobe tpm_tis
[   44.956905] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)

b) compiling TPM-support in-kernel and manually bind the ACPI device

(initramfs) dmesg | grep -i tpm
[    0.000000] efi: ACPI 2.0=0x9ea7e000 ACPI=0x9ea7e000 SMBIOS=0x9f5eb000 SMBIOS
3.0=0x9f5ea000 ESRT=0x9c07d918 MEMATTR=0x9bea3018 TPMEventLog=0x97cbb018
[    0.003546] ACPI: TPM2 0x000000009EAB7F70 000034 (v03 LENOVO TC-S06 00001260
AMI 00000000)
(initramfs) echo MSFT0101:00 >/sys/bus/platform/drivers/tpm_tis/bind
[  233.076079] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)


It seems to me, the kernel tries to enable the TPM to early...


Michael