Re: [PATCH v2] tpm: use a map for tpm2_calc_ordinal_duration()

[Jarkko Sakkinen <jarkko@kernel.org>]

On Thu, Sep 18, 2025 at 10:30:18PM +0300, Jarkko Sakkinen wrote:
> The current shenanigans for duration calculation introduce too much
> complexity for a trivial problem, and further the code is hard to patch and
> maintain.
> 
> Address these issues with a flat look-up table, which is easy to understand
> and patch. If leaf driver specific patching is required in future, it is
> easy enough to make a copy of this table during driver initialization and
> add the chip parameter back.
> 
> 'chip->duration' is retained for TPM 1.x.
> 
> As the first entry for this new behavior address TCG spec update mentioned
> in this issue:
> 
> https://github.com/raspberrypi/linux/issues/7054
> 
> Therefore, for TPM_SelfTest the duration is set to 3000 ms.
> 
> This does not categorize a as bug, given that this is introduced to the
> spec after the feature was originally made.
> 
> Cc: Frédéric Jouen <fjouen@sealsq.com>
> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
> ---
> v2:
> - Add the missing msec_to_jiffies() calls.
> - Drop redundant stuff.

Run also through kselftest.

BR, Jarkko