Re: [PATCH v3 0/2] thermal: mediatek: Add cpu power cooling model

From: dawei chien
Date: Mon Nov 02 2015 - 05:46:31 EST

Hi Viresh,
On Wed, 2015-10-28 at 21:14 +0530, Viresh Kumar wrote:
> On 22-10-15, 20:02, Dawei Chien wrote:
> > Use Intelligent Power Allocation (IPA) technical to add static/dynamic power model for binding CPU thermal zone.
> > The power allocator governor allocates power budget to control CPU temperature.
> >
> > Power Allocator governor is able to keep SOC temperature within a defined temperature range to avoid SOC overheat and keep it's performance. mt8173-cpufreq.c need to register its' own power model with power allocator thermal governor, so that power allocator governor can allocates suitable power budget to control CPU temperature.
> >
> > PATCH1 is base on
> >
> >
> > PATCH2 is base on Sascha's thermal driver V9
> >
> >
> >
> >
> > Change since V1:
> > include mt8171.h and sort header file for mt8173.dtsi
> >
> > Change since V2:
> > Move dynamic/static power model in device tree
> >
> > Dawei.Chien (2):
> > thermal: mediatek: Add cpu power cooling model.
> > arm64: dts: mt8173: Add thermal zone node for mt8173.
> Sorry for being extremely late in reviewing this stuff. You are
> already on v3 and I haven't reviewed it once. Mostly due to bad timing
> of my holidays and other work pressure.

You're welcome, truly thank you for your kindly reviewing

> Now, there are few things that I feel are not properly addressed here,
> and I may be wrong:
> - Where are the bindings for static-power-points and
> dynamic-power-coefficient. Sorry I failed to see them in this or
> other series you mentioned.

Please refer to following document (2-1,2-2) for dynamic-power &
static-power in detail. Besides, do I need to add another document for
our own MT8173 IC.

> - Even then, why should we be adding another table into DT for
> voltage/power ? And not reuse and extend the opp-v2 stuff which is
> already mainlined now.

We could reuse opp-v2 for static power points after OPPV2 back port to
our currently branch.
However, as far as I know, there is no "power" in opp.c (suck like
opp-hz) as far, so I need to add something in opp.c for my purpose, suck
like add power in _opp_add_static_v2, and add something for return
"power", right? I may be wrong, please kindly give me your suggestion,
thank you.

Actually, I am considering to remove the part of static power point
since it is optional for Power Model. Could you agree with this?
> - There are few issues with the code as well, but I want to see where
> the bindings should go first. And then only discuss the code
> further.

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