Rob,
在 2017年07月18日 04:07, Rob Herring 写道:
On Mon, Jul 17, 2017 at 04:14:28PM +0800, Caesar Wang wrote:
This patch adds the MALI's power-model to set the IPA model to be used for power management.
What's IPA? India Pale Ale or Intermediate Physical Address?
IPA is intelligent Power Allocator. (As the ARM introduced on https://developer.arm.com/open-source/intelligent-power-allocation)
Signed-off-by: Caesar Wang wxt@rock-chips.com
Changes in v2: None
Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt index a461e47..b616e6b 100644 --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt @@ -37,6 +37,18 @@ Optional properties:
- operating-points-v2 : Refer to Documentation/devicetree/bindings/power/opp.txt for details.
+- power_model : Sets power model parameters. Note that this model was designed for the Juno
platform, and may not be suitable for other platforms. A structure containing :
- compatible: Should be arm,mali-simple-power-model
- dynamic-coefficient: Coefficient, in pW/(Hz V^2), which is multiplied
by v^2*f to calculate the dynamic power consumption.
- static-coefficient: Coefficient, in uW/V^3, which is multiplied by
v^3 to calculate the static power consumption.
- ts: An array containing coefficients for the temperature scaling
factor. This is used to scale the static power by a factor oftsf/1000000, where tsf = ts[3]*T^3 + ts[2]*T^2 + ts[1]*T + ts[0],and T = temperature in degrees.
- thermal-zone: A string identifying the thermal zone used for the GPU
This can all easily be implied by the compatible string. I'm not inclined to accept something Mali specific here.
Isn't arm,mali-midgard.txt document suit for Mali specific? :-)
This looks *very* precise, but I'd be surprised if these values are any more than magic values (at least the dynamic coef) adjusted until the desired power/performance requirements are achieved. To put it another way, why don't we have similar values for CPUs?
These value was calculated by running full GPU process.
CPU had the similar value for dtsi.
Say: arch/arm64/boot/dts/rockchip/rk3399.dtsi cpu_b0: cpu@100 { ... dynamic-power-coefficient = <436>; ... };
-Caesar
Rob