Messages in this thread Patch in this message | | | From | Stefan Mahnke-Hartmann <> | Subject | [PATCH 2/2] tpm: Add Field Upgrade mode support for Infineon TPM2 modules | Date | Fri, 6 May 2022 14:31:48 +0200 |
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TPM2_GetCapability with a capability that has the property type value of TPM_PT_TOTAL_COMMANDS returns a zero length list, when an Infineon TPM2 is in Field Upgrade mode. Since an Infineon TPM2.0 in Field Upgrade mode returns RC_SUCCESS on TPM2_Startup, the Field Upgrade mode has to be detected by TPM2_GetCapability.
Signed-off-by: Stefan Mahnke-Hartmann <stefan.mahnke-hartmann@infineon.com> --- drivers/char/tpm/tpm2-cmd.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index e62a644ce26b..659130e2936e 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -746,6 +746,12 @@ int tpm2_auto_startup(struct tpm_chip *chip) } rc = tpm2_get_cc_attrs_tbl(chip); + /* + * Infineon TPM in Field Upgrade mode will return no data for the number + * of supported commands. + */ + if (rc == -ENODATA) + rc = TPM2_RC_UPGRADE; out: if (rc == TPM2_RC_UPGRADE) { -- 2.25.1
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