Re: [PATCH v2 0/3] Clarify abstract scale usage for power values in Energy Model, EAS and IPA

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On 10/16/20 5:02 PM, Quentin Perret wrote:
On Friday 16 Oct 2020 at 15:42:57 (+0100), Lukasz Luba wrote:
Do you mean a new entry in DT which will be always below
'dynamic-power-coefficient' and/or 'sustainable-power' saying the unit
of above value?

Yes, something like that.

There was discussion with Rob (and Doug) about this. I got the
impression he was against any new DT stuff [1].
We don't have to, I think we all agree that DT will only support mW.

Right, I agree this is a 'nice-to-have'.

I have agreed to this idea having a 'flag' inside EM [2], which
indicates the mW or bogoWatts. It could be set via API:
em_dev_register_perf_domain() and this new last argument.

I can write that patch. There is only two usage (3rd is on LKML) of
that function. The DT way, which is via:
dev_pm_opp_of_register_em() will always set 'true';
Driver direct calls of em_dev_register_perf_domain(), will have to
set appropriate value ('true' or 'false'). The EM struct em_perf_domain
will have the new bool field set based on that.
Is it make sense?

I had something more complicated in mind, where units are arbitrary
('milliwats', 'scmi-bogowatts', ...) as that would help if units can be
specified in the DT too, but if we don't care about that then yes I
suppose a boolean flag should do.

Thank you Quentin for help in sorting this out.
I'll send the v3.

Regards,
Lukasz


Thanks!
Quentin




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