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

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Message-ID: <5ce01da3-cb00-3d35-5164-d837df65c184@nvidia.com>
Date:   Tue, 19 Feb 2019 14:08:26 +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 4:29 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.
>> +        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.
>>  
>> @@ -96,22 +105,26 @@ Example :
>>  		throttle-cfgs {
>>  			/*
>>  			 * When the "heavy" cooling device triggered,
>> -			 * the HW will skip cpu clock's pulse in 85% depth
>> +			 * the HW will skip cpu clock's pulse in 85% depth,
>> +			 * skip gpu clock's pulse in 85% level
>>  			 */
>>  			throttle_heavy: heavy {
>>  				nvidia,priority = <100>;
>>  				nvidia,cpu-throt-percent = <85>;
>> +				nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>;
>>  
>>  				#cooling-cells = <1>;
>>  			};
>>  
>>  			/*
>>  			 * When the "light" cooling device triggered,
>> -			 * the HW will skip cpu clock's pulse in 50% depth
>> +			 * the HW will skip cpu clock's pulse in 50% depth,
>> +			 * skip gpu clock's pulse in 50% level
>>  			 */
>>  			throttle_light: light {
>>  				nvidia,priority = <80>;
>>  				nvidia,cpu-throt-percent = <50>;
>> +				nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_LOW>;
>>  
>>  				#cooling-cells = <1>;
>>  			};
>> diff --git a/include/dt-bindings/thermal/tegra124-soctherm.h b/include/dt-bindings/thermal/tegra124-soctherm.h
>> index c15e8b709a0d..75853df1c609 100644
>> --- a/include/dt-bindings/thermal/tegra124-soctherm.h
>> +++ b/include/dt-bindings/thermal/tegra124-soctherm.h
>> @@ -1,5 +1,19 @@
>>  /* SPDX-License-Identifier: GPL-2.0 */
>>  /*
>> + * Copyright (c) 2014 - 2018, NVIDIA CORPORATION.  All rights reserved.
>> + *
>> + * Author:
>> + *      Mikko Perttunen <mperttunen@...dia.com>
>> + *
>> + * This software is licensed under the terms of the GNU General Public
>> + * License version 2, as published by the Free Software Foundation, and
>> + * may be copied, distributed, and modified under those terms.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
> 
> Why are you adding this?

We doesn't need it, will remove it.

> 
>>   * This header provides constants for binding nvidia,tegra124-soctherm.
>>   */
>>  
>> @@ -12,9 +26,9 @@
>>  #define TEGRA124_SOCTHERM_SENSOR_PLLX 3
>>  #define TEGRA124_SOCTHERM_SENSOR_NUM 4
>>  
>> -#define TEGRA_SOCTHERM_THROT_LEVEL_LOW  0
>> -#define TEGRA_SOCTHERM_THROT_LEVEL_MED  1
>> -#define TEGRA_SOCTHERM_THROT_LEVEL_HIGH 2
>> -#define TEGRA_SOCTHERM_THROT_LEVEL_NONE -1
>> +#define TEGRA_SOCTHERM_THROT_LEVEL_NONE 0
>> +#define TEGRA_SOCTHERM_THROT_LEVEL_LOW  1
>> +#define TEGRA_SOCTHERM_THROT_LEVEL_MED  2
>> +#define TEGRA_SOCTHERM_THROT_LEVEL_HIGH 3
> 
> You are breaking an ABI.
> 
> Rob
>