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?
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.
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?
Rob