Hi Rob,
On 07/12/2021 19:41, Rob Herring wrote:
[ ... ]
>> thermal_zones: thermal-zones {
>> cpu_thermal: cpu-thermal {
>> polling-delay-passive = <100>;
>> @@ -2027,6 +2050,8 @@ gpu: gpu@ff9a0000 {
>> clocks = <&cru ACLK_GPU>;
>> #cooling-cells = <2>;
>> power-domains = <&power RK3399_PD_GPU>;
>> + #powerzone-cells = <0>;
>> + powerzone = <&PKG_PZ>;
>
> Every CPU and the GPU are in the same powerzone. What is the point? Do
> you really have to be told that CPUs and GPU are a source of heat and
> might need to be limited?
A powerzone ==> can read power && set power limit
Every CPU is a powerzone as well as the GPU.
They are all grouped under PKG_PZ.
That means we have:
pkg
|-- cpu0-3
|
|-- cpu4-7
|
`-- gpu
We can read the power consumption of cpu0-3, cpu4-7 or gpu and set their
power limit.
We can read the power consumption of pkg (which is the sum of the power
consumption of cpu0-3, cpu4-7 and gpu) and I can set the power limit
which will ensure powerof(cpu0-3 + cpu4-7 + gpu) <= powerof(pkg).
--
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog
