From: Matthias Kaehlcke <mka@chromium.org>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: "michael.kao" <michael.kao@mediatek.com>,
Zhang Rui <rui.zhang@intel.com>,
Eduardo Valentin <edubezval@gmail.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
lkml <linux-kernel@vger.kernel.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
linux-mediatek@lists.infradead.org
Subject: Re: [PATCH v2 1/8] arm64: dts: mt8183: add thermal zone node
Date: Thu, 30 May 2019 09:08:25 -0700 [thread overview]
Message-ID: <20190530160825.GM40515@google.com> (raw)
In-Reply-To: <CAJMQK-giJTeERnqjxoSMjF-JXxW9SPmeARWf3f9ZyRgBsYN5fg@mail.gmail.com>
On Thu, May 30, 2019 at 02:27:28PM +0800, Hsin-Yi Wang wrote:
> On Fri, May 10, 2019 at 9:27 PM michael.kao <michael.kao@mediatek.com> wrote:
>
> > +
> > + tzts1: tzts1 {
> > + polling-delay-passive = <0>;
> > + polling-delay = <0>;
> > + thermal-sensors = <&thermal 1>;
> > + sustainable-power = <0>;
> > + trips {};
> > + cooling-maps {};
> > + };
> > +
> Is 0 a valid initial sustainable-power setting? Since we'll still get
> warning[1] about this, though it might not be harmful.
>
> If 0 is a valid setting, maybe we should consider showing the warning
> of not setting this property in [2]?
>
> [1] https://elixir.bootlin.com/linux/latest/source/drivers/thermal/power_allocator.c#L570
> [2] https://elixir.bootlin.com/linux/latest/source/drivers/thermal/of-thermal.c#L1049
IIUC a value of 0 is pointless, the thermal framework will still use
an estimated value:
https://elixir.bootlin.com/linux/v5.1.5/source/drivers/thermal/power_allocator.c#L203
As commented on v1 (https://patchwork.kernel.org/patch/10926519/#22620905)
the value of the property may depend on the thermal characteristics of
the device, there is not one correct value per SoC/core. If it is
specified at SoC level device makers should be aware that they might
have to override it for 'optimal' behavior on their device.
WARNING: multiple messages have this Message-ID (diff)
From: Matthias Kaehlcke <mka@chromium.org>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
Daniel Lezcano <daniel.lezcano@linaro.org>,
lkml <linux-kernel@vger.kernel.org>,
"michael.kao" <michael.kao@mediatek.com>,
Eduardo Valentin <edubezval@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
linux-mediatek@lists.infradead.org,
Matthias Brugger <matthias.bgg@gmail.com>,
Zhang Rui <rui.zhang@intel.com>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 1/8] arm64: dts: mt8183: add thermal zone node
Date: Thu, 30 May 2019 09:08:25 -0700 [thread overview]
Message-ID: <20190530160825.GM40515@google.com> (raw)
In-Reply-To: <CAJMQK-giJTeERnqjxoSMjF-JXxW9SPmeARWf3f9ZyRgBsYN5fg@mail.gmail.com>
On Thu, May 30, 2019 at 02:27:28PM +0800, Hsin-Yi Wang wrote:
> On Fri, May 10, 2019 at 9:27 PM michael.kao <michael.kao@mediatek.com> wrote:
>
> > +
> > + tzts1: tzts1 {
> > + polling-delay-passive = <0>;
> > + polling-delay = <0>;
> > + thermal-sensors = <&thermal 1>;
> > + sustainable-power = <0>;
> > + trips {};
> > + cooling-maps {};
> > + };
> > +
> Is 0 a valid initial sustainable-power setting? Since we'll still get
> warning[1] about this, though it might not be harmful.
>
> If 0 is a valid setting, maybe we should consider showing the warning
> of not setting this property in [2]?
>
> [1] https://elixir.bootlin.com/linux/latest/source/drivers/thermal/power_allocator.c#L570
> [2] https://elixir.bootlin.com/linux/latest/source/drivers/thermal/of-thermal.c#L1049
IIUC a value of 0 is pointless, the thermal framework will still use
an estimated value:
https://elixir.bootlin.com/linux/v5.1.5/source/drivers/thermal/power_allocator.c#L203
As commented on v1 (https://patchwork.kernel.org/patch/10926519/#22620905)
the value of the property may depend on the thermal characteristics of
the device, there is not one correct value per SoC/core. If it is
specified at SoC level device makers should be aware that they might
have to override it for 'optimal' behavior on their device.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-05-30 16:08 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-10 13:26 [PATCH v2 0/8] Add Mediatek thermal dirver and dtsi michael.kao
2019-05-10 13:26 ` michael.kao
2019-05-10 13:26 ` [PATCH v2 1/8] arm64: dts: mt8183: add thermal zone node michael.kao
2019-05-10 13:26 ` michael.kao
2019-05-30 6:27 ` Hsin-Yi Wang
2019-05-30 6:27 ` Hsin-Yi Wang
2019-05-30 16:08 ` Matthias Kaehlcke [this message]
2019-05-30 16:08 ` Matthias Kaehlcke
2019-12-06 9:46 ` Michael Kao (高振翔)
2019-05-10 13:27 ` [PATCH v2 3/8] arm64: dts: mt8183: Add #cooling-cells to CPU nodes michael.kao
2019-05-10 13:27 ` michael.kao
[not found] ` <1557494826-6044-1-git-send-email-michael.kao-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2019-05-10 13:27 ` [PATCH v2 2/8] arm64: dts: mt8183: add/update dynamic power coefficients michael.kao
2019-05-10 13:27 ` michael.kao
2019-05-10 13:27 ` [PATCH v2 4/8] arm64: dts: mt8183: Configure CPU cooling michael.kao
2019-05-10 13:27 ` michael.kao
2019-05-10 13:27 ` [PATCH v2 5/8] arm64: dts: mt8183: Increase polling frequency for CPU thermal zone michael.kao
2019-05-10 13:27 ` michael.kao
2019-05-10 13:27 ` [PATCH v2 6/8] thermal: mediatek: mt8183: fix bank number settings michael.kao
2019-05-10 13:27 ` michael.kao
2019-05-10 13:27 ` [PATCH v2 8/8] thermal: mediatek: use spinlock to protect PTPCORESEL michael.kao
2019-05-10 13:27 ` michael.kao
2019-05-10 13:27 ` [PATCH v2 7/8] thermal: mediatek: add another get_temp ops for thermal sensors michael.kao
2019-05-10 13:27 ` michael.kao
2019-09-09 11:13 ` Hsin-Yi Wang
2019-09-09 11:13 ` Hsin-Yi Wang
2019-09-09 11:13 ` Hsin-Yi Wang
2019-11-21 7:00 ` Hsin-Yi Wang
2019-11-21 7:00 ` Hsin-Yi Wang
2019-11-21 7:00 ` Hsin-Yi Wang
2019-12-06 9:35 ` Michael Kao
2019-12-06 9:35 ` Michael Kao
2019-12-06 9:35 ` Michael Kao
2019-12-05 16:38 ` [PATCH v2 0/8] Add Mediatek thermal dirver and dtsi Daniel Lezcano
2019-12-05 16:38 ` Daniel Lezcano
2019-12-05 16:38 ` Daniel Lezcano
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