Date: Wed, 08 Apr 2015 11:30:03 +0200
From: Lukasz Majewski <l.majewski@samsung.com>
To: Anand Moon <linux.amoon@gmail.com>
Cc: devicetree@vger.kernel.org,
        "linux-samsung-soc@vger.kernel.org" 
	<linux-samsung-soc@vger.kernel.org>,
        Russell King <linux@arm.linux.org.uk>, linux-pwm@vger.kernel.org,
        linux-kernel@vger.kernel.org, Eduardo Valentin <edubezval@gmail.com>,
        Sjoerd Simons <sjoerd.simons@collabora.co.uk>,
        Kukjin Kim <kgene@kernel.org>, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/6] ARM:dts exynos5422 Update the thermal sensor for
 tmu_cpu0
Message-id: <20150408113003.78ec5f86@amdc2363>
In-reply-to: <CANAwSgTSsGF1p7ehvMHpBX5MbtickOKXe3oZw26EuB9BMxY4Hg@mail.gmail.com>
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Hi Anand,

> Hi Lukasz,
> 
> On Odroidxu3 board critical temp is 85.0 C. Below is the sensors
> output.

Do you have XU3 with a fan?

> 
> therm_zone0-virtual-0
> Adapter: Virtual device
> temp1: +39.0▒ၰC (crit = +85.0▒°C)
> temp2: +38.0▒°C (crit = +85.0▒°C)
> temp3: +40.0▒°C (crit = +85.0▒°C)
> temp4: +49.0▒°C (crit = +85.0▒°C)
> temp5: +29.0▒°C (crit = +85.0▒°C)
> 
> I have observed cpu shutdown as we do test pm-qa thermal testing.
> 
> So I propose the temperature values to be 50000, 65000 ,80000 and
> 85000 Critical temperature.
> 

This seems strange - since other Samsung's SoC have higher work
temperatures (both exynos5 and exynos4).

I will try to check those thresholds on my XU3. Have anybody else
experienced overheating at XU3?

Sjoerd? Kukjin?

> Please share your thoughts.
> 
> -Anand Moon
> 
> On 8 April 2015 at 13:32, Lukasz Majewski <l.majewski@samsung.com>
> wrote:
> > Hi Anand,
> >
> >> Move the registration of thermal sensors for tmu_cpu0 from
> >> exynos5420.dtsi to exynos5-cpu-thermal.dtsi, to avoid duplicate
> >> registration of the sensors.
> >>
> >> Tested on OdroidXU3 board.
> >>
> >> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> >> ---
> >>  arch/arm/boot/dts/exynos5-cpu-thermal.dtsi | 58
> >> ++++++++++++++++++++++++++++++
> >> arch/arm/boot/dts/exynos5420.dtsi          |  4 ---
> >> arch/arm/boot/dts/exynos5422-odroidxu3.dts |  1 + 3 files changed,
> >> 59 insertions(+), 4 deletions(-) create mode 100644
> >> arch/arm/boot/dts/exynos5-cpu-thermal.dtsi
> >>
> >> diff --git a/arch/arm/boot/dts/exynos5-cpu-thermal.dtsi
> >> b/arch/arm/boot/dts/exynos5-cpu-thermal.dtsi new file mode 100644
> >> index 0000000..8fede70
> >> --- /dev/null
> >> +++ b/arch/arm/boot/dts/exynos5-cpu-thermal.dtsi
> >> @@ -0,0 +1,58 @@
> >> +/*
> >> + * Device tree sources for Exynos5 thermal zone
> >> + *
> >> + * Copyright (c) 2014 Lukasz Majewski <l.majewski@samsung.com>
> >
> >                         ^^^^^^^^^^^^^^^^ Could you update this
> >                         line :-). I'm just reviewer here :-)
> >
> >> + *
> >> + * This program is free software; you can redistribute it and/or
> >> modify
> >> + * it under the terms of the GNU General Public License version 2
> >> as
> >> + * published by the Free Software Foundation.
> >> + *
> >> + */
> >> +
> >> +#include <dt-bindings/thermal/thermal.h>
> >> +
> >> +/ {
> >> +     thermal-zones {
> >> +             cpu0_thermal: cpu0-thermal {
> >> +                     thermal-sensors = <&tmu_cpu0>;
> >> +                     polling-delay-passive = <0>;
> >> +                     polling-delay = <0>;
> >> +                     trips {
> >> +                             cpu_alert0: cpu-alert-0 {
> >> +                                     temperature = <48000>; /* ms
> >> */
> >> +                                     hysteresis = <3000>; /* ms */
> >                                                             ^^^^^^^^^
> >                                                         We already
> > have "millicelsius"
> >                                                         instead od
> > ms
> >> +                                     type = "active";
> >> +                             };
> >> +                             cpu_alert1: cpu-alert-1 {
> >> +                                     temperature = <53000>; /* ms
> >> */
> >> +                                     hysteresis = <3000>; /* ms */
> >> +                                     type = "active";
> >> +                             };
> >> +                             cpu_alert2: cpu-alert-2 {
> >> +                                     temperature = <59000>; /* ms
> >> */
> >> +                                     hysteresis = <3000>; /* ms */
> >> +                                     type = "active";
> >> +                             };
> >> +                             cpu_crit0: cpu-crit-0 {
> >> +                                     temperature = <75000>; /* ms
> >> */
> >> +                                     hysteresis = <0>; /* ms */
> >> +                                     type = "critical";
> >
> >                 Is there any special reasons why we need special
> > values for cpu0_thermal sensor at XU3? Is something wrong with
> >                 default values defined at exynos4-cpu-thermal.dtsi?
> >
> >                 If this is Odroid XU3 specific, then IMHO it should
> > be added to exynos5422-odroidxu3.dts
> >
> >> +                             };
> >> +                     };
> >> +                     cooling-maps {
> >> +                             map0 {
> >> +                                  trip = <&cpu_alert0>;
> >> +                                  cooling-device = <&fan0 0 1>;
> >> +                             };
> >> +                             map1 {
> >> +                                  trip = <&cpu_alert1>;
> >> +                                  cooling-device = <&fan0 1 2>;
> >> +                             };
> >> +                             map2 {
> >> +                                  trip = <&cpu_alert2>;
> >> +                                  cooling-device = <&fan0 2 3>;
> >> +                             };
> >> +                     };
> >> +             };
> >> +     };
> >> +};
> >> diff --git a/arch/arm/boot/dts/exynos5420.dtsi
> >> b/arch/arm/boot/dts/exynos5420.dtsi index 6b49f3c..eb0f16c 100644
> >> --- a/arch/arm/boot/dts/exynos5420.dtsi
> >> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> >> @@ -827,10 +827,6 @@
> >>       };
> >>
> >>       thermal-zones {
> >> -             cpu0_thermal: cpu0-thermal {
> >> -                     thermal-sensors = <&tmu_cpu0>;
> >> -                     #include "exynos5420-trip-points.dtsi"
> >                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [1]
> >
> >> -             };
> >>               cpu1_thermal: cpu1-thermal {
> >>                      thermal-sensors = <&tmu_cpu1>;
> >>                      #include "exynos5420-trip-points.dtsi"
> >> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> >> b/arch/arm/boot/dts/exynos5422-odroidxu3.dts index eaec006..c8b3e3e
> >> 100644 --- a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> >> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> >> @@ -12,6 +12,7 @@
> >>
> >>  /dts-v1/;
> >>  #include "exynos5800.dtsi"
> >> +#include "exynos5-cpu-thermal.dtsi"
> >
> > I would prefer to stick to convention proposed at [1]. It keeps
> > the locality of the include with respective thermal zone.
> >
> >>
> >>  / {
> >>       model = "Hardkernel Odroid XU3";
> >
> > DTS changes should be added to Samsung tree by Samsung maintainer -
> > Mr. Kukjin Kim.
> >
> > --
> > Best regards,
> >
> > Lukasz Majewski
> >
> > Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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