arm64: dts: qcom: sm8250: correct dynamic power coefficients

sm8250 faces the same problem with its Energy Model as sdm845. The energy
cost of LITTLE cores is reported to be higher than medium or big cores

EM computes the energy with formula:

energy = OPP's cost / maximum cpu capacity * utilization

On v6.4-rc6 we have:
max capacity of CPU0 = 284
capacity of CPU0's OPP(1612800 Hz) = 253
cost of CPU0's OPP(1612800 Hz) = 191704

max capacity of CPU4 = 871
capacity of CPU4's OPP(710400 Hz) = 255
cost of CPU4's OPP(710400 Hz) = 343217

Both OPPs have almost the same compute capacity but the estimated energy
per unit of utilization will be estimated to:

energy CPU0 = 191704 / 284 * 1 = 675
energy CPU4 = 343217 / 871 * 1 = 394

EM estimates that little CPU0 will consume 71% more than medium CPU4 for
the same compute capacity. According to [1], little consumes 25% less than
medium core for Coremark benchmark at those OPPs for the same duration.

Set the dynamic-power-coefficient of CPU0-3 to 105 to fix the energy model
for little CPUs.

[1] https://github.com/kdrag0n/freqbench/tree/master/results/sm8250/k30s

Fixes: 6aabed5526ee ("arm64: dts: qcom: sm8250: Add CPU capacities and energy model")
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20230615154852.130076-1-vincent.guittot@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
index 83ab6de459bc4469c9e1e7ce08ab7be183020daa..dd817ec200f1892f3e523ada5d7ad4887b17a609 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
@@ -100,7 +100,7 @@
                        clocks = <&cpufreq_hw 0>;
                        enable-method = "psci";
                        capacity-dmips-mhz = <448>;
-                       dynamic-power-coefficient = <205>;
+                       dynamic-power-coefficient = <105>;
                        next-level-cache = <&L2_0>;
                        power-domains = <&CPU_PD0>;
                        power-domain-names = "psci";
@@ -131,7 +131,7 @@
                        clocks = <&cpufreq_hw 0>;
                        enable-method = "psci";
                        capacity-dmips-mhz = <448>;
-                       dynamic-power-coefficient = <205>;
+                       dynamic-power-coefficient = <105>;
                        next-level-cache = <&L2_100>;
                        power-domains = <&CPU_PD1>;
                        power-domain-names = "psci";
@@ -156,7 +156,7 @@
                        clocks = <&cpufreq_hw 0>;
                        enable-method = "psci";
                        capacity-dmips-mhz = <448>;
-                       dynamic-power-coefficient = <205>;
+                       dynamic-power-coefficient = <105>;
                        next-level-cache = <&L2_200>;
                        power-domains = <&CPU_PD2>;
                        power-domain-names = "psci";
@@ -181,7 +181,7 @@
                        clocks = <&cpufreq_hw 0>;
                        enable-method = "psci";
                        capacity-dmips-mhz = <448>;
-                       dynamic-power-coefficient = <205>;
+                       dynamic-power-coefficient = <105>;
                        next-level-cache = <&L2_300>;
                        power-domains = <&CPU_PD3>;
                        power-domain-names = "psci";