diff mbox series

[v3,5/7] tpm: Handle an exception for TPM Firmware Update mode.

Message ID 20200210162838.173903-6-amirmizi6@gmail.com
State Superseded
Headers show
Series add tpm i2c ptp driver | expand

Commit Message

amirmizi6@gmail.com Feb. 10, 2020, 4:28 p.m. UTC 
From: Amir Mizinski <amirmizi6@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.

This improvment was suggested by Benoit Houyere.

Signed-off-by: Amir Mizinski <amirmizi6@gmail.com>
---
 drivers/char/tpm/tpm2-cmd.c | 4 ++++
 include/linux/tpm.h         | 1 +
 2 files changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 13696de..997b11e 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -725,6 +725,10 @@  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,