From: Frank Wunderlich <frank-w@public-files.de>
To: Eric Woudstra <ericwouds@gmail.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
Sean Wang <sean.wang@mediatek.com>,
Ryder Lee <ryder.lee@mediatek.com>,
Daniel Golle <daniel@makrotopia.org>
Subject: Aw: Re: [PATCH] Fix mt7622.dtsi thermal cpu
Date: Fri, 25 Jun 2021 10:16:43 +0200 [thread overview]
Message-ID: <trinity-7580d955-3187-41e5-9297-1ac8f628a9d5-1624609003739@3c-app-gmx-bs66> (raw)
In-Reply-To: <3dd22cf2-1186-4870-aa49-e5cddc18c6e9@gmail.com>
Hi,
> Gesendet: Donnerstag, 24. Juni 2021 um 15:29 Uhr
> Von: "Eric Woudstra" <ericwouds@gmail.com>
> The SOC runs unthrotlled slowly to 80 degrees. This takes minutes. Polling interval 1 second or less does not matter much when looking at these temperature rise times
>
> After that in more then an hour it slowly creeps up to 85. I believe the design is so that the SOC, under normal circumstances, can run at 1.35 GHz without throttling frequency, without heatsink. It just needs a safeguard for different circumstances.
>
> Most of these SOCs can also run in industrial grade circumstances, which means up to 85 degrees ambient temperature already . If not industrial then this would be 60 degrees ambient already
>
> But only someone at Mediatek can confirm this
maybe Matthias knows anybody?
get_maintainers-script shows no mtk employee for mtk_thermal driver, added Sean and Ryder as common Linux-Contacts...
Daniel from openwrt have some other mt7622 Boards maybe he can test the Fan approach below
> On Jun 24, 2021, 12:21 PM, at 12:21 PM, Daniel Lezcano <daniel.lezcano@linaro.org> wrote:
> >Found that:
> >
> >https://download.kamami.pl/p579344-MT7622A_Datasheet_for_BananaPi_Only%281%29.pdf
> >
> >Chapter 3.3 - Thermal Characteristics
> >
> >Given the values I suggest:
> >
> > - Passive - 80°C
> >
> > - Hot - 90°C
> >
> > - Critical - 100°C
maybe adding FAN (r64, don't know for other mt7622 boards) for lower 2 trips (with adjusted temperature points) and cpu-throtteling for upper 2 trips
something like this (used the 70/80 trip points discussed before):
--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
@@ -134,6 +134,13 @@
};
};
+ fan0: pwm-fan {
+ compatible = "pwm-fan";
+ #cooling-cells = <2>;
+ pwms = <&pwm 2 10000 0>;
+ cooling-levels = <0 102 170 230>;
+ };
+
thermal-zones {
cpu_thermal: cpu-thermal {
polling-delay-passive = <1000>;
@@ -143,13 +150,13 @@
trips {
cpu_passive: cpu-passive {
- temperature = <47000>;
+ temperature = <70000>;
hysteresis = <2000>;
type = "passive";
};
cpu_active: cpu-active {
- temperature = <67000>;
+ temperature = <80000>;
hysteresis = <2000>;
type = "active";
};
@@ -170,14 +177,12 @@
cooling-maps {
map0 {
trip = <&cpu_passive>;
- cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
- <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+ cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
};
map1 {
trip = <&cpu_active>;
- cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
- <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+ cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
};
map2 {
@@ -428,6 +433,7 @@
pwm: pwm@11006000 {
compatible = "mediatek,mt7622-pwm";
reg = <0 0x11006000 0 0x1000>;
+ #pwm-cells = <3>;
interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_LOW>;
clocks = <&topckgen CLK_TOP_PWM_SEL>,
<&pericfg CLK_PERI_PWM_PD>,
regards Frank
next prev parent reply other threads:[~2021-06-25 8:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-19 12:19 [PATCH] Fix mt7622.dtsi thermal cpu ericwouds
2021-06-21 18:29 ` Daniel Lezcano
2021-06-23 15:35 ` Eric Woudstra
2021-06-23 15:58 ` Daniel Lezcano
2021-06-23 18:43 ` Eric Woudstra
2021-06-23 20:08 ` Daniel Lezcano
2021-06-24 9:59 ` Eric Woudstra
2021-06-24 10:21 ` Daniel Lezcano
2021-06-24 13:29 ` Eric Woudstra
2021-06-25 8:16 ` Frank Wunderlich [this message]
2021-06-25 9:22 ` Daniel Golle
2021-06-25 9:31 ` Aw: " Frank Wunderlich
2021-06-25 10:11 ` Daniel Golle
2021-06-25 9:57 ` Aw: " Daniel Lezcano
2021-06-25 11:03 ` Aw: " Frank Wunderlich
2021-06-25 11:07 ` Eric Woudstra
2021-06-25 11:47 ` Aw: " Daniel Lezcano
2021-06-25 12:28 ` Aw: " Frank Wunderlich
2021-06-25 12:50 ` Daniel Lezcano
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