linux-kernel - Re: [PATCH v1 2/3] thermal: gov_bang_bang: Relocate regulation logic description

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Message-ID: <f65d008c-1ccb-42b6-8200-c1553d2057ea@arm.com>
Date: Fri, 17 Jan 2025 08:51:18 +0000
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v1 2/3] thermal: gov_bang_bang: Relocate regulation logic
 description



On 1/16/25 19:31, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Move the regulation logic description from the bang_bang_trip_crossed()
> kerneldoc to the preamble.
> 
> No functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/gov_bang_bang.c |   43 +++++++++++++++++++---------------------
>   1 file changed, 21 insertions(+), 22 deletions(-)
> 
> --- a/drivers/thermal/gov_bang_bang.c
> +++ b/drivers/thermal/gov_bang_bang.c
> @@ -7,6 +7,27 @@
>    *  Based on step_wise.c with following Copyrights:
>    *  Copyright (C) 2012 Intel Corp
>    *  Copyright (C) 2012 Durgadoss R <durgadoss.r@...el.com>
> + *
> + * Regulation Logic: a two point regulation, deliver cooling state depending
> + * on the previous state shown in this diagram:
> + *
> + *                Fan:   OFF    ON
> + *
> + *                              |
> + *                              |
> + *          trip_temp:    +---->+
> + *                        |     |        ^
> + *                        |     |        |
> + *                        |     |   Temperature
> + * (trip_temp - hyst):    +<----+
> + *                        |
> + *                        |
> + *                        |
> + *
> + *   * If the fan is not running and temperature exceeds trip_temp, the fan
> + *     gets turned on.
> + *   * In case the fan is running, temperature must fall below
> + *     (trip_temp - hyst) so that the fan gets turned off again.
>    */
>   
>   #include <linux/thermal.h>
> @@ -38,28 +59,6 @@
>    * @tz: thermal_zone_device
>    * @trip: the trip point
>    * @crossed_up: whether or not the trip has been crossed on the way up
> - *
> - * Regulation Logic: a two point regulation, deliver cooling state depending
> - * on the previous state shown in this diagram:
> - *
> - *                Fan:   OFF    ON
> - *
> - *                              |
> - *                              |
> - *          trip_temp:    +---->+
> - *                        |     |        ^
> - *                        |     |        |
> - *                        |     |   Temperature
> - * (trip_temp - hyst):    +<----+
> - *                        |
> - *                        |
> - *                        |
> - *
> - *   * If the fan is not running and temperature exceeds trip_temp, the fan
> - *     gets turned on.
> - *   * In case the fan is running, temperature must fall below
> - *     (trip_temp - hyst) so that the fan gets turned off again.
> - *
>    */
>   static void bang_bang_trip_crossed(struct thermal_zone_device *tz,
>   				   const struct thermal_trip *trip,
> 
> 
> 

Reviewed-by: Lukasz Luba <lukasz.luba@....com>