Acked: [SRU][N][PATCH 0/2] TPM timeouts occur on some Infineon TPMs

[You-Sheng Yang]

Clean cherry pick. LGTM.

Acked-by: You-Sheng Yang <vicamo.yang at canonical.com>


On Tue, Jan 6, 2026 at 11:55 PM Ivan Hu <ivan.hu at canonical.com> wrote:
>
> BugLink: https://bugs.launchpad.net/bugs/2137528
>
> [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
> or
> tpm tpm0: Operation Timed out
>
> When this occurs, the TPM becomes unresponsive. Any critical system services o
>  boot processes that depend on the TPM will fail, leading to a boot failure or
> indefinite wait state.
>
> [Fix]
> The issue is resolved by the following 4 commits
> 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 or tpm tpm0: Operation Timed out
> no longer appears.
>
> [Where problems could occur]
> Low. The patches add a status verification for checking completion only in
> cases where the TPM seems to be unresponsive.
>
> Jarkko Sakkinen (2):
>   tpm: Make chip->{status,cancel,req_canceled} opt
>   tpm: Check for completion after timeout
>
>  drivers/char/tpm/tpm-interface.c | 47 ++++++++++++++++++++++++++++----
>  drivers/char/tpm/tpm_ftpm_tee.c  | 20 --------------
>  2 files changed, 42 insertions(+), 25 deletions(-)
>
> --
> 2.43.0
>
>
> --
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> kernel-team at lists.ubuntu.com
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-- 
Regards,
You-Sheng Yang