linux-kernel - Re: [PATCH v5 3/5] thermal: streamline get

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Date:	Tue, 7 Jun 2016 11:44:46 +0530
From:	Keerthy <a0393675@...com>
To:	Caesar Wang <wxt@...k-chips.com>, <edubezval@...il.com>,
	<linux-pm@...r.kernel.org>
CC:	Heiko Stuebner <heiko@...ech.de>, <dianders@...omium.org>,
	<briannorris@...gle.com>, <smbarber@...gle.com>,
	<linux-rockchip@...ts.infradead.org>, <cf@...k-chips.com>,
	<huangtao@...k-chips.com>, <dmitry.torokhov@...il.com>,
	<javi.merino@....com>, <peter@...e.net>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Zhang Rui <rui.zhang@...el.com>, Keerthy <j-keerthy@...com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v5 3/5] thermal: streamline get_trend callbacks



On Monday 06 June 2016 05:14 PM, Caesar Wang wrote:
> From: Sascha Hauer <s.hauer@...gutronix.de>
>
> The .get_trend callback in struct thermal_zone_device_ops has
> the prototype:
>          int (*get_trend) (struct thermal_zone_device *, int,
>                            enum thermal_trend *);
> whereas the .get_trend callback in struct thermal_zone_of_device_ops
> has:
>          int (*get_trend)(void *, long *);
>
> Streamline both prototypes and add the trip argument to the OF callback
> aswell and use enum thermal_trend * instead of an integer pointer.
>
> While the OF prototype may be the better one, this should be decided at
> framework level and not on OF level.

Tested this patch on omap5-uevm using emulation feature and saw that
cooling state was getting updated correctly w.r.t trip point tempereatures.

A minor comment below apart from that.

Reviewed-by: Keerthy <j-keerthy@...com>

>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Eduardo Valentin <edubezval@...il.com>
> Cc: linux-pm@...r.kernel.org
> ---
>
> Changes in v5: None
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
>   drivers/thermal/of-thermal.c                       | 11 +---------
>   drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 25 +++++++---------------
>   include/linux/thermal.h                            |  2 +-
>   3 files changed, 10 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index 2d2a06f..ba72c35 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -202,24 +202,15 @@ static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
>   				enum thermal_trend *trend)
>   {
>   	struct __thermal_zone *data = tz->devdata;
> -	long dev_trend;
>   	int r;

	int r = 0;

>
>   	if (!data->ops->get_trend)
>   		return -EINVAL;
>
> -	r = data->ops->get_trend(data->sensor_data, &dev_trend);
> +	r = data->ops->get_trend(data->sensor_data, trip, trend);
>   	if (r)
>   		return r;

no need of this if check just
	
	return r;

>
> -	/* TODO: These intervals might have some thresholds, but in core code */
> -	if (dev_trend > 0)
> -		*trend = THERMAL_TREND_RAISING;
> -	else if (dev_trend < 0)
> -		*trend = THERMAL_TREND_DROPPING;
> -	else
> -		*trend = THERMAL_TREND_STABLE;
> -
>   	return 0;
>   }
>
> diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> index 15c0a9a..4a6757c 100644
> --- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> @@ -239,7 +239,7 @@ static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
>   	return 0;
>   }
>
> -static int __ti_thermal_get_trend(void *p, long *trend)
> +static int __ti_thermal_get_trend(void *p, int trip, enum thermal_trend *trend)
>   {
>   	struct ti_thermal_data *data = p;
>   	struct ti_bandgap *bgp;
> @@ -252,22 +252,6 @@ static int __ti_thermal_get_trend(void *p, long *trend)
>   	if (ret)
>   		return ret;
>
> -	*trend = tr;
> -
> -	return 0;
> -}
> -
> -/* Get the temperature trend callback functions for thermal zone */
> -static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
> -				int trip, enum thermal_trend *trend)
> -{
> -	int ret;
> -	long tr;
> -
> -	ret = __ti_thermal_get_trend(thermal->devdata, &tr);
> -	if (ret)
> -		return ret;
> -
>   	if (tr > 0)
>   		*trend = THERMAL_TREND_RAISING;
>   	else if (tr < 0)
> @@ -278,6 +262,13 @@ static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
>   	return 0;
>   }
>
> +/* Get the temperature trend callback functions for thermal zone */
> +static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
> +				int trip, enum thermal_trend *trend)
> +{
> +	return __ti_thermal_get_trend(thermal->devdata, trip, trend);
> +}
> +
>   /* Get critical temperature callback functions for thermal zone */
>   static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
>   				    int *temp)
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 2440b8d..d3ce3a5 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -352,7 +352,7 @@ struct thermal_genl_event {
>    */
>   struct thermal_zone_of_device_ops {
>   	int (*get_temp)(void *, int *);
> -	int (*get_trend)(void *, long *);
> +	int (*get_trend)(void *, int, enum thermal_trend *);
>   	int (*set_trips)(void *, int, int);
>   	int (*set_emul_temp)(void *, int);
>   	int (*set_trip_temp)(void *, int, int);
>