[BUG] Nuvoton NCPT650 TPM 2.0 mode not working

[Michael Niewöhner]

Hi all,

Nuvoton NCPT650 does not work in TPM 2.0 mode with tpm_tis / tpm_i2c_nuvoton
while it works in TPM 1.2 mode (I can reflash it via UEFI setup).
Kernel version is 4.19.1

Kernel config:

$ cat .config | egrep 'TCG|TPM|CRB|_TIS'
CONFIG_TCG_TPM=y
CONFIG_HW_RANDOM_TPM=y
CONFIG_TCG_TIS_CORE=y
CONFIG_TCG_TIS=y
CONFIG_TCG_TIS_SPI=y
# CONFIG_TCG_TIS_I2C_ATMEL is not set
# CONFIG_TCG_TIS_I2C_INFINEON is not set
CONFIG_TCG_TIS_I2C_NUVOTON=y
# CONFIG_TCG_NSC is not set
# CONFIG_TCG_ATMEL is not set
# CONFIG_TCG_INFINEON is not set
CONFIG_TCG_CRB=y
# CONFIG_TCG_VTPM_PROXY is not set
# CONFIG_TCG_TIS_ST33ZP24_I2C is not set
# CONFIG_TCG_TIS_ST33ZP24_SPI is not set


TPM 1.2 mode dmesg:

$ dmesg | egrep -i tis\|tpm\|crb
[    3.210040] tpm_tis 00:0a: 1.2 TPM (device-id 0xFE, rev-id 2)


TPM 2.0 mode dmesg:

$ dmesg | egrep -i tis\|tpm\|crb
[    0.000000] efi:  ACPI
2.0=0x9e457000  ACPI=0x9e457000  SMBIOS=0x9ec44000  SMBIOS
3.0=0x9ec43000  TPMEventLog=0x9711f018 
[    0.003517] ACPI: TPM2 0x000000009E490ED8 000034 (v03 LENOVO TC-
S06   00001300 AMI  00000000)
[    4.071550] ima: No TPM chip found, activating TPM-bypass!


Any ideas?


Best regards
Michael