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tpm: Add field upgrade mode support for Infineon TPM2 modules 

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>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Stefan Mahnke-Hartmann 2022-05-13 15:41:53 +02:00 committed by Jarkko Sakkinen
parent e57b2523bd
commit af402ee3c0
1 changed files with 5 additions and 1 deletions
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6
drivers/char/tpm/tpm2-cmd.c
View File

@ -754,7 +754,11 @@ int tpm2_auto_startup(struct tpm_chip *chip)
rc = tpm2_get_cc_attrs_tbl(chip);
out:
if (rc == TPM2_RC_UPGRADE) {
/*
* Infineon TPM in field upgrade mode will return no data for the number
* of supported commands.
*/
if (rc == TPM2_RC_UPGRADE || rc == -ENODATA) {
dev_info(&chip->dev, "TPM in field upgrade mode, requires firmware upgrade\n");
chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
rc = 0;