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

[Stefan Bader]

On 06/01/2026 16:54, Ivan Hu 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(-)
> 


Applied to noble:linux/master-next. Thanks.

-Stefan

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_0xE8675DEECBEECEA3.asc
Type: application/pgp-keys
Size: 48643 bytes
Desc: OpenPGP public key
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20260109/d72d4dc5/attachment-0001.key>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20260109/d72d4dc5/attachment-0001.sig>