[PATCH v9 5/8] tpm: Handle an exception for TPM Firmware Update mode.

[amirmizi6]

From: Amir Mizinski <amirmi...@gmail.com>

An extra precaution for TPM Firmware Update Mode.
For example if TPM power was cut while in Firmware update, platform
should ignore "selftest" failure and skip TPM initialization sequence.

Suggested-by: Benoit Houyere <benoit.houy...@st.com>
Signed-off-by: Amir Mizinski <amirmi...@gmail.com>
---
 drivers/char/tpm/tpm2-cmd.c | 4 ++++
 include/linux/tpm.h         | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 7603295..6e42946 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -727,6 +727,10 @@ int tpm2_auto_startup(struct tpm_chip *chip)
                goto out;
 
        rc = tpm2_do_selftest(chip);
+
+       if (rc == TPM2_RC_UPGRADE || rc == TPM2_RC_COMMAND_CODE)
+               return 0;
+
        if (rc && rc != TPM2_RC_INITIALIZE)
                goto out;
 
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 03e9b18..5a2e031 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -199,6 +199,7 @@ enum tpm2_return_codes {
        TPM2_RC_INITIALIZE      = 0x0100, /* RC_VER1 */
        TPM2_RC_FAILURE         = 0x0101,
        TPM2_RC_DISABLED        = 0x0120,
+       TPM2_RC_UPGRADE         = 0x012D,
        TPM2_RC_COMMAND_CODE    = 0x0143,
        TPM2_RC_TESTING         = 0x090A, /* RC_WARN */
        TPM2_RC_REFERENCE_H0    = 0x0910,
-- 
2.7.4