Re: TPM interrupt patch on LTS

[Jarkko Sakkinen]

On Tue Dec 26, 2023 at 4:50 PM EET, João Paulo Silva Gonçalves wrote:
> Hello, 
>
> We are integrating a SPI TPM from Infineon with 6.1/5.15 LTS kernels for an 
> embedded platform and it is giving an error message that interrupts are not working. 
> There is a correction from [1] already on upstream but the patch that makes 
> interrupts work, commit e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test"), was 
> not backported to LTS. This seems to be the only patch that was no backported 
> from [1]. I read some discussion on lkml about TPM interrupts problems but did 
> not get if it is related or the reason for not backporting the patch. 
>
> Do you know the reason this single patch was not backported?  
>
> [1] https://lore.kernel.org/lkml/20221124135538.31020-1-LinoSanfilippo@xxxxxx/
>
> Thanks!
>
> Regards,
> Joao Paulo Goncalves

You can disable interrupts with "interrupts" kernel command-line
parameter. It's not backported because essentialy it is a feature,
i.e. interrupts have been never working before properly.

BR, Jarkko