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Message-ID: <c3f792db-7819-448b-9905-680b48810ac8@linaro.org>
Date: Thu, 29 Jan 2026 09:36:39 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: webgeek1234@...il.com, Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Xilin Wu <wuxilin123@...il.com>
Subject: Re: [PATCH] arm64: dts: qcom: sm8550: Update EAS properties
On 1/28/26 20:11, Aaron Kling via B4 Relay wrote:
> From: Xilin Wu <wuxilin123@...il.com>
>
> The original values provided by Qualcomm appear to be quite
> inaccurate. Specifically, some heavy gaming tasks could be
> improperly assigned to the A510 cores by the scheduler, resulting
> in a CPU bottleneck. This update to the EAS properties aims to
> enhance the user experience across various scenarios.
>
> The power numbers were obtained using a Type-C power meter, which
> was directly connected to the battery connector on the AYN Odin 2
> motherboard, acting as a fake battery.
>
> It should be noted that the A715 cores seem less efficient than the
> A710 cores. Therefore, an average value has been assigned to them,
> considering that the A715 and A710 cores share a single cpufreq
> domain.
>
> Cortex-A510 cores:
> 441 kHz, 564 mV, 43 mW, 350 Cx
> 556 kHz, 580 mV, 59 mW, 346 Cx
> 672 kHz, 592 mV, 71 mW, 312 Cx
> 787 kHz, 604 mV, 83 mW, 290 Cx
> 902 kHz, 608 mV, 96 mW, 288 Cx
> 1017 kHz, 624 mV, 107 mW, 264 Cx
> 1113 kHz, 636 mV, 117 mW, 252 Cx
> 1228 kHz, 652 mV, 130 mW, 240 Cx
> 1344 kHz, 668 mV, 146 mW, 235 Cx
> 1459 kHz, 688 mV, 155 mW, 214 Cx
> 1555 kHz, 704 mV, 166 mW, 205 Cx
> 1670 kHz, 724 mV, 178 mW, 192 Cx
> 1785 kHz, 744 mV, 197 mW, 189 Cx
> 1900 kHz, 764 mV, 221 mW, 190 Cx
> 2016 kHz, 784 mV, 243 mW, 188 Cx
> Your dynamic-power-coefficient for cpu 1: 251
>
> Cortex-A715 cores:
> 614 kHz, 572 mV, 97 mW, 470 Cx
> 729 kHz, 592 mV, 123 mW, 473 Cx
> 844 kHz, 608 mV, 152 mW, 486 Cx
> 940 kHz, 624 mV, 178 mW, 485 Cx
> 1056 kHz, 644 mV, 207 mW, 465 Cx
> 1171 kHz, 656 mV, 243 mW, 480 Cx
> 1286 kHz, 672 mV, 271 mW, 459 Cx
> 1401 kHz, 692 mV, 310 mW, 454 Cx
> 1536 kHz, 716 mV, 368 mW, 462 Cx
> 1651 kHz, 740 mV, 416 mW, 454 Cx
> 1785 kHz, 760 mV, 492 mW, 475 Cx
> 1920 kHz, 784 mV, 544 mW, 457 Cx
> 2054 kHz, 804 mV, 613 mW, 458 Cx
> 2188 kHz, 828 mV, 702 mW, 465 Cx
> 2323 kHz, 852 mV, 782 mW, 461 Cx
> 2457 kHz, 876 mV, 895 mW, 473 Cx
> 2592 kHz, 896 mV, 1020 mW, 490 Cx
> 2707 kHz, 920 mV, 1140 mW, 498 Cx
> 2803 kHz, 940 mV, 1215 mW, 490 Cx
> Your dynamic-power-coefficient for cpu 3: 472
>
> Cortex-A710 cores:
> 614 kHz, 572 mV, 91 mW, 388 Cx
> 729 kHz, 592 mV, 116 mW, 424 Cx
> 844 kHz, 608 mV, 143 mW, 443 Cx
> 940 kHz, 624 mV, 165 mW, 434 Cx
> 1056 kHz, 644 mV, 195 mW, 430 Cx
> 1171 kHz, 656 mV, 218 mW, 414 Cx
> 1286 kHz, 672 mV, 250 mW, 415 Cx
> 1401 kHz, 692 mV, 286 mW, 412 Cx
> 1536 kHz, 716 mV, 331 mW, 407 Cx
> 1651 kHz, 740 mV, 374 mW, 401 Cx
> 1785 kHz, 760 mV, 439 mW, 417 Cx
> 1920 kHz, 784 mV, 495 mW, 411 Cx
> 2054 kHz, 804 mV, 557 mW, 412 Cx
> 2188 kHz, 828 mV, 632 mW, 415 Cx
> 2323 kHz, 852 mV, 721 mW, 422 Cx
> 2457 kHz, 876 mV, 813 mW, 427 Cx
> 2592 kHz, 896 mV, 912 mW, 435 Cx
> 2707 kHz, 920 mV, 1019 mW, 442 Cx
> 2803 kHz, 940 mV, 1087 mW, 436 Cx
> Your dynamic-power-coefficient for cpu 5: 421
>
> Cortex-X3 core:
> 729 kHz, 568 mV, 252 mW, 1110 Cx
> 864 kHz, 580 mV, 312 mW, 1097 Cx
> 998 kHz, 592 mV, 379 mW, 1109 Cx
> 1132 kHz, 608 mV, 453 mW, 1099 Cx
> 1248 kHz, 624 mV, 517 mW, 1067 Cx
> 1363 kHz, 636 mV, 587 mW, 1067 Cx
> 1478 kHz, 648 mV, 657 mW, 1058 Cx
> 1593 kHz, 664 mV, 739 mW, 1049 Cx
> 1708 kHz, 680 mV, 813 mW, 1020 Cx
> 1843 kHz, 704 mV, 940 mW, 1021 Cx
> 1977 kHz, 724 mV, 1054 mW, 1007 Cx
> 2092 kHz, 740 mV, 1201 mW, 1045 Cx
> 2227 kHz, 768 mV, 1358 mW, 1029 Cx
> 2342 kHz, 788 mV, 1486 mW, 1016 Cx
> 2476 kHz, 812 mV, 1711 mW, 1046 Cx
> 2592 kHz, 836 mV, 1846 mW, 1014 Cx
> 2726 kHz, 856 mV, 2046 mW, 1020 Cx
> 2841 kHz, 880 mV, 2266 mW, 1027 Cx
> 2956 kHz, 908 mV, 2616 mW, 1074 Cx
> 3187 kHz, 956 mV, 3326 mW, 1147 Cx
> Your dynamic-power-coefficient for cpu 7: 1057
>
> 7-zip benchmark single-core MIPS:
> 2128 4416 4632 6686
>
> Signed-off-by: Xilin Wu <wuxilin123@...il.com>
> Signed-off-by: Aaron Kling <webgeek1234@...il.com>
> ---
> arch/arm64/boot/dts/qcom/sm8550.dtsi | 32 ++++++++++++++++----------------
> 1 file changed, 16 insertions(+), 16 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> index e3f93f4f412ded9583a6bc9215185a0daf5f1b57..7bbbf3109bc2c6e2e6445207cc86c401be482a73 100644
> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> @@ -76,8 +76,8 @@ cpu0: cpu@0 {
> power-domains = <&cpu_pd0>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 0>;
> - capacity-dmips-mhz = <1024>;
> - dynamic-power-coefficient = <100>;
> + capacity-dmips-mhz = <326>;
> + dynamic-power-coefficient = <251>;
> #cooling-cells = <2>;
> l2_0: l2-cache {
> compatible = "cache";
> @@ -102,8 +102,8 @@ cpu1: cpu@100 {
> power-domains = <&cpu_pd1>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 0>;
> - capacity-dmips-mhz = <1024>;
> - dynamic-power-coefficient = <100>;
> + capacity-dmips-mhz = <326>;
> + dynamic-power-coefficient = <251>;
> #cooling-cells = <2>;
> l2_100: l2-cache {
> compatible = "cache";
> @@ -123,8 +123,8 @@ cpu2: cpu@200 {
> power-domains = <&cpu_pd2>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 0>;
> - capacity-dmips-mhz = <1024>;
> - dynamic-power-coefficient = <100>;
> + capacity-dmips-mhz = <326>;
> + dynamic-power-coefficient = <251>;
> #cooling-cells = <2>;
> l2_200: l2-cache {
> compatible = "cache";
> @@ -144,8 +144,8 @@ cpu3: cpu@300 {
> power-domains = <&cpu_pd3>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 1>;
> - capacity-dmips-mhz = <1792>;
> - dynamic-power-coefficient = <270>;
> + capacity-dmips-mhz = <693>;
> + dynamic-power-coefficient = <447>;
> #cooling-cells = <2>;
> l2_300: l2-cache {
> compatible = "cache";
> @@ -165,8 +165,8 @@ cpu4: cpu@400 {
> power-domains = <&cpu_pd4>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 1>;
> - capacity-dmips-mhz = <1792>;
> - dynamic-power-coefficient = <270>;
> + capacity-dmips-mhz = <693>;
> + dynamic-power-coefficient = <447>;
> #cooling-cells = <2>;
> l2_400: l2-cache {
> compatible = "cache";
> @@ -186,8 +186,8 @@ cpu5: cpu@500 {
> power-domains = <&cpu_pd5>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 1>;
> - capacity-dmips-mhz = <1792>;
> - dynamic-power-coefficient = <270>;
> + capacity-dmips-mhz = <693>;
> + dynamic-power-coefficient = <447>;
> #cooling-cells = <2>;
> l2_500: l2-cache {
> compatible = "cache";
> @@ -207,8 +207,8 @@ cpu6: cpu@600 {
> power-domains = <&cpu_pd6>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 1>;
> - capacity-dmips-mhz = <1792>;
> - dynamic-power-coefficient = <270>;
> + capacity-dmips-mhz = <693>;
> + dynamic-power-coefficient = <447>;
> #cooling-cells = <2>;
> l2_600: l2-cache {
> compatible = "cache";
> @@ -228,8 +228,8 @@ cpu7: cpu@700 {
> power-domains = <&cpu_pd7>;
> power-domain-names = "psci";
> qcom,freq-domain = <&cpufreq_hw 2>;
> - capacity-dmips-mhz = <1894>;
> - dynamic-power-coefficient = <588>;
> + capacity-dmips-mhz = <1024>;
> + dynamic-power-coefficient = <1057>;
> #cooling-cells = <2>;
> l2_700: l2-cache {
> compatible = "cache";
>
> ---
> base-commit: 3f24e4edcd1b8981c6b448ea2680726dedd87279
> change-id: 20260128-sm8550-eas-cdaffda7f779
>
> Best regards,
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Thanks,
Neil
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