tpm: tis: Double the timeout B to 4s

JIRA: https://issues.redhat.com/browse/RHEL-72765

Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit 2f661f7
Author: Michal Suchanek <msuchanek@suse.de>
Date:   Fri Apr 4 10:23:14 2025 +0200

    tpm: tis: Double the timeout B to 4s

    With some Infineon chips the timeouts in tpm_tis_send_data (both B and
    C) can reach up to about 2250 ms.

    Timeout C is retried since
    commit de9e33d ("tpm, tpm_tis: Workaround failed command reception on Infineon devices")

    Timeout B still needs to be extended.

    The problem is most commonly encountered with context related operation
    such as load context/save context. These are issued directly by the
    kernel, and there is no retry logic for them.

    When a filesystem is set up to use the TPM for unlocking the boot fails,
    and restarting the userspace service is ineffective. This is likely
    because ignoring a load context/save context result puts the real TPM
    state and the TPM state expected by the kernel out of sync.

    Chips known to be affected:
    tpm_tis IFX1522:00: 2.0 TPM (device-id 0x1D, rev-id 54)
    Description: SLB9672
    Firmware Revision: 15.22

    tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1B, rev-id 22)
    Firmware Revision: 7.83

    tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1A, rev-id 16)
    Firmware Revision: 5.63

    Link: https://lore.kernel.org/linux-integrity/Z5pI07m0Muapyu9w@kitsune.suse.cz/
    Signed-off-by: Michal Suchanek <msuchanek@suse.de>
    Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
    Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

Signed-off-by: Štěpán Horáček <shoracek@redhat.com>

Author: shoracek

drivers/char/tpm/tpm_tis_core.h

@@ -53,7 +53,7 @@ enum tis_int_flags {
 enum tis_defaults {
 	TIS_MEM_LEN = 0x5000,
 	TIS_SHORT_TIMEOUT = 750,	/* ms */
-	TIS_LONG_TIMEOUT = 2000,	/* 2 sec */
+	TIS_LONG_TIMEOUT = 4000,	/* 4 secs */
 	TIS_TIMEOUT_MIN_ATML = 14700,	/* usecs */
 	TIS_TIMEOUT_MAX_ATML = 15000,	/* usecs */
 };

include/linux/tpm.h

@@ -181,7 +181,7 @@ enum tpm2_const {
 
 enum tpm2_timeouts {
 	TPM2_TIMEOUT_A          =    750,
-	TPM2_TIMEOUT_B          =   2000,
+	TPM2_TIMEOUT_B          =   4000,
 	TPM2_TIMEOUT_C          =    200,
 	TPM2_TIMEOUT_D          =     30,
 	TPM2_DURATION_SHORT     =     20,