** Description changed:
[Impact]
Certain Infineon TPM devices may experience timeout issues during the boot
process. This manifests as a communication failure between the kernel driver
and the TPM hardware.
The issue manifests as a communication failure between the kernel driver and
the TPM hardware during the boot process. The kernel logs the following error:
`tpm tpm0: tpm_try_transmit: send(): error -62`
Error -62 corresponds to `ETIME` (Timer expired). When this occurs, the
TPM becomes unresponsive. Any critical system services or boot processes
that depend on the TPM will fail, leading to a boot failure or
indefinite wait state.
[Fix]
The issue is resolved by backporting the following 4 commits
- 1. de9e33df7762 ("tpm, tpm_tis: Workaround failed command reception on
Infineon devices")
- 2. 2f661f71fda1 ("tpm: tis: Double the timeout B to 4s")
+ 1. de9e33df7762 ("tpm, tpm_tis: Workaround failed command reception on
Infineon devices") -- already SRUed https://bugs.launchpad.net/bugs/2128722
+ 2. 2f661f71fda1 ("tpm: tis: Double the timeout B to 4s") -- already SRUed
https://bugs.launchpad.net/bugs/2130344
3. 980a573621ea ("tpm: Make chip->{status,cancel,req_canceled} opt")
4. d4640c394f23 ("tpm: Check for completion after timeout")
[Test Plan]
Run automated reboot loops on an affected Infineon device with the patched
kernel(kernel snap better).
Grep logs to ensure tpm_try_transmit: send(): error -62 no longer appears.
[Where problems could occur]
Low. The patches extend a specific timeout and add a status verification. The
primary side effect is a slightly longer wait time (2s increased to 4s) only in
cases where the TPM is actually unresponsive.
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https://bugs.launchpad.net/bugs/2137528
Title:
TPM timeouts occur on some Infineon TPMs
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