linux-kernel - Re: [PATCH v1 04/12] of: Add bindings of gpu hw throttle for Tegra soctherm

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Message-ID: <739a8c81-ee0a-999e-0508-6aa1fba768b7@nvidia.com>
Date:   Tue, 19 Feb 2019 14:34:49 +0800
From:   Wei Ni <wni@...dia.com>
To:     Rob Herring <robh@...nel.org>
CC:     <thierry.reding@...il.com>, <daniel.lezcano@...aro.org>,
        <edubezval@...il.com>, <linux-tegra@...r.kernel.org>,
        <rui.zhang@...el.com>, <srikars@...dia.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v1 04/12] of: Add bindings of gpu hw throttle for Tegra
 soctherm



On 19/2/2019 4:33 AM, Rob Herring wrote:
> On Tue, Dec 18, 2018 at 03:34:36PM +0800, Wei Ni wrote:
>> Add "nvidia,gpu-throt-level" property to set gpu hw
>> throttle level.
>>
>> Signed-off-by: Wei Ni <wni@...dia.com>
>> ---
>>  .../bindings/thermal/nvidia,tegra124-soctherm.txt  | 17 +++++++++++++++--
>>  include/dt-bindings/thermal/tegra124-soctherm.h    | 22 ++++++++++++++++++----
>>  2 files changed, 33 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
>> index ab66d6feab4b..cf6d0be56b7a 100644
>> --- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
>> +++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
>> @@ -52,6 +52,15 @@ Required properties :
>>          Must set as following values:
>>          TEGRA_SOCTHERM_THROT_LEVEL_LOW, TEGRA_SOCTHERM_THROT_LEVEL_MED
>>          TEGRA_SOCTHERM_THROT_LEVEL_HIGH, TEGRA_SOCTHERM_THROT_LEVEL_NONE
>> +      - nvidia,gpu-throt-level: This property is for Tegra124 and Tegra210.
> 
> Also, why not just use percents like nvidia,cpu-throt-percent?

Hi Rob,
We have to use "-level" for gpu throttle, can't use percents. It's
designed by hardware.
BTW, for the cpu-throt, it use "-level" for t132, and use "-percent" for
t124 and t210.

Thanks.
Wei.

> 
>> +        It is the level of pulse skippers, which used to throttle clock
>> +        frequencies. It indicates gpu clock throttling depth and can be
>> +        programmed to any of the following values which represent a throttling
>> +        percentage:
>> +        TEGRA_SOCTHERM_THROT_LEVEL_NONE (0%)
>> +        TEGRA_SOCTHERM_THROT_LEVEL_LOW (50%),
>> +        TEGRA_SOCTHERM_THROT_LEVEL_MED (75%),
>> +        TEGRA_SOCTHERM_THROT_LEVEL_HIGH (85%).
>>        - #cooling-cells: Should be 1. This cooling device only support on/off state.
>>          See ./thermal.txt for a description of this property.