linux-kernel - Aw: Re: Re: [PATCH] Fix mt7622.dtsi thermal cpu

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Date:   Fri, 25 Jun 2021 13:03:16 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Eric Woudstra <ericwouds@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sean Wang <sean.wang@...iatek.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Daniel Golle <daniel@...rotopia.org>
Subject: Aw: Re:  Re: [PATCH] Fix mt7622.dtsi thermal cpu

Hi

> Gesendet: Freitag, 25. Juni 2021 um 11:57 Uhr
> Von: "Daniel Lezcano" <daniel.lezcano@...aro.org>

> You should not add the fan in the mt7622.dtsi itself but in the board
> specific file where there is a fan output on it. mt7622.dtsi is supposed
> to be the SoC itself AFAICT.
>
> For instance:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi#n39
>
> https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi#n164

> > @@ -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>;
> >  				};
>
> fan == active trip point
>
> This is referring to the passive trip point. So it should point to the
> CPU as it is now. Note the order of mitigation is inverted regarding the
> proposal description.

but we need to disable the passive trip as cpu-trotteling starts there...the higher temperature trips are currently not reached

summary

moving fan and cpu_thermal-override to bananapi-r64.dts

passive-trip: cooling-device = <&cpu0/1 0 0> as in erics Patch
active trip: cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
the other 2 unchanged

but i suggest changing the temperature points in mt7622 dtsi as this is SoC specific

so basicly:

--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
@@ -143,13 +143,13 @@ cpu_thermal: cpu-thermal {

                        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";
                                };
@@ -170,8 +170,8 @@ cpu-crit {
                        cooling-maps {
                                map0 {
                                        trip = <&cpu_passive>;
-                                       cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
-                                                        <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+                                       cooling-device = <&cpu0 0 0>,
+                                                        <&cpu1 0 0>;
                                };

                                map1 {
@@ -428,6 +428,7 @@ uart3: serial@...05000 {
        pwm: pwm@...06000 {
                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>,

--- a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
@@ -37,6 +37,13 @@ cpu@1 {
                };
        };

+       fan0: pwm-fan {
+               compatible = "pwm-fan";
+               #cooling-cells = <2>;
+               pwms = <&pwm 2 10000 0>;
+               cooling-levels = <0 102 170 230>;
+       };
+
        gpio-keys {
                compatible = "gpio-keys";

@@ -582,6 +589,29 @@ &u3phy {
        status = "okay";
 };

+&cpu_thermal {
+       cooling-maps {
+               map1 {
+                       trip = <&cpu_active>;
+                       cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+               };
+       };
+};
+
 &uart0 {
        pinctrl-names = "default";
        pinctrl-0 = <&uart0_pins>;