1cd8ae19a9
Add backported patched from 5.x from usb related fixes Up kernel version to most recent lts
88 lines
2.4 KiB
Diff
88 lines
2.4 KiB
Diff
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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