88 lines
2.4 KiB
Diff
88 lines
2.4 KiB
Diff
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From ac60c5e33df4ec2b69c7e3ebbc0ccf1557e7bd5e Mon Sep 17 00:00:00 2001
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From: Matthias Kaehlcke <mka@chromium.org>
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Date: Thu, 11 Apr 2019 17:01:58 -0700
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Subject: [PATCH 22/54] ARM: dts: rockchip: Add dynamic-power-coefficient for
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rk3288
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The value was determined with the following method:
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- take CPUs 1-3 offline
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- for each OPP
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- set cpufreq min and max freq to OPP freq
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- start dhrystone benchmark
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- measure CPU power consumption during 10s
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- calculate Cx for OPPx
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- Cx = (Px - P1) / (Vx²fx - V1²f1) [1]
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using the following units: mW / Ghz / V [2]
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- C = avg(C2, ..., Cn)
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[1] see commit 4daa001a1773 ("arm64: dts: juno: Add cpu
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dynamic-power-coefficient information")
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[2] https://patchwork.kernel.org/patch/10493615/#22158551
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FTR, these are the values for the different OPPs:
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freq (kHz) mV Px (mW) Cx
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126000 900 39
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216000 900 66 370
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312000 900 95 372
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408000 900 122 363
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600000 900 177 359
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696000 950 230 363
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816000 1000 297 361
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1008000 1050 404 362
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1200000 1100 528 362
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1416000 1200 770 377
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1512000 1300 984 385
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1608000 1350 1156 394
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Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
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Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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---
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arch/arm/boot/dts/rk3288.dtsi | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
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index 23e9c5253019..884957da8700 100644
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--- a/arch/arm/boot/dts/rk3288.dtsi
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+++ b/arch/arm/boot/dts/rk3288.dtsi
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@@ -64,6 +64,7 @@
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#cooling-cells = <2>; /* min followed by max */
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clock-latency = <40000>;
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clocks = <&cru ARMCLK>;
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+ dynamic-power-coefficient = <370>;
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};
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cpu1: cpu@501 {
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device_type = "cpu";
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@@ -74,6 +75,7 @@
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#cooling-cells = <2>; /* min followed by max */
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clock-latency = <40000>;
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clocks = <&cru ARMCLK>;
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+ dynamic-power-coefficient = <370>;
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};
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cpu2: cpu@502 {
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device_type = "cpu";
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@@ -84,6 +86,7 @@
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#cooling-cells = <2>; /* min followed by max */
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clock-latency = <40000>;
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clocks = <&cru ARMCLK>;
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+ dynamic-power-coefficient = <370>;
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};
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cpu3: cpu@503 {
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device_type = "cpu";
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@@ -94,6 +97,7 @@
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#cooling-cells = <2>; /* min followed by max */
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clock-latency = <40000>;
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clocks = <&cru ARMCLK>;
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+ dynamic-power-coefficient = <370>;
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};
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};
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--
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2.11.0
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