linux-kernel - Re: [PATCH V3] hwmon: scmi-hwmon: implement change

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Message-ID: <da42560b-32b2-49c6-9aeb-b7fbd5b5577c@roeck-us.net>
Date: Thu, 25 Jan 2024 08:16:45 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Cristian Marussi <cristian.marussi@....com>
Cc: Peng Fan <peng.fan@....com>, "Peng Fan (OSS)" <peng.fan@....nxp.com>,
 "groeck7@...il.com" <groeck7@...il.com>,
 "sudeep.holla@....com" <sudeep.holla@....com>,
 "jdelvare@...e.com" <jdelvare@...e.com>,
 "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] hwmon: scmi-hwmon: implement change_mode for thermal
 zones

On 1/25/24 08:09, Cristian Marussi wrote:

> Agreed, but it seems that indeed here the attempt is to make sure that
> an accidentally disabled sensor is turned on.
> 

 From the patch:

+static int scmi_hwmon_thermal_change_mode(struct thermal_zone_device *tz,
+					  enum thermal_device_mode new_mode)
+{
..
+	if (new_mode == THERMAL_DEVICE_ENABLED)
+		config |= SCMI_SENS_CFG_SENSOR_ENABLED_MASK;
+	else
+		config &= ~SCMI_SENS_CFG_SENSOR_ENABLED_MASK;

This clearly contradicts your statement. It leaves the sensor in full control
by the thermal subsystem. If the thermal subsystem decides to turn it off,
it is turned off.

Guenter