thermal: Use mode helpers in drivers

Use thermal_zone_device_{en|dis}able() and thermal_zone_device_is_enabled().

Consequently, all set_mode() implementations in drivers:

- can stop modifying tzd's "mode" member,
- shall stop taking tzd's lock, as it is taken in the helpers
- shall stop calling thermal_zone_device_update() as it is called in the
helpers
- can assume they are called when the mode truly changes, so checks to
verify that can be dropped

Not providing set_mode() by a driver no longer prevents the core from
being able to set tzd's mode, so the relevant check in mode_store() is
removed.

Other comments:

- acpi/thermal.c: tz->thermal_zone->mode will be updated only after we
return from set_mode(), so use function parameter in thermal_set_mode()
instead, no need to call acpi_thermal_check() in set_mode()
- thermal/imx_thermal.c: regmap writes and mode assignment are done in
thermal_zone_device_{en|dis}able() and set_mode() callback
- thermal/intel/intel_quark_dts_thermal.c: soc_dts_{en|dis}able() are a
part of set_mode() callback, so they don't need to modify tzd->mode, and
don't need to fall back to the opposite mode if unsuccessful, as the return
value will be propagated to thermal_zone_device_{en|dis}able() and
ultimately tzd's member will not be changed in thermal_zone_device_set_mode().
- thermal/of-thermal.c: no need to set zone->mode to DISABLED in
of_parse_thermal_zones() as a tzd is kzalloc'ed so mode is DISABLED anyway

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
[for acerhdf]
Acked-by: Peter Kaestle <peter@piie.net>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200629122925.21729-8-andrzej.p@collabora.com

1 files changed, 17 insertions, 20 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index ad61b2db30b8..4fb73d0fd167 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -280,18 +280,11 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
 {
 	struct mlxsw_thermal *thermal = tzdev->devdata;
 
-	mutex_lock(&tzdev->lock);
-
 	if (mode == THERMAL_DEVICE_ENABLED)
 		tzdev->polling_delay = thermal->polling_delay;
 	else
 		tzdev->polling_delay = 0;
 
-	tzdev->mode = mode;
-	mutex_unlock(&tzdev->lock);
-
-	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
-
 	return 0;
 }
 
@@ -458,19 +451,11 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
 	struct mlxsw_thermal_module *tz = tzdev->devdata;
 	struct mlxsw_thermal *thermal = tz->parent;
 
-	mutex_lock(&tzdev->lock);
-
 	if (mode == THERMAL_DEVICE_ENABLED)
 		tzdev->polling_delay = thermal->polling_delay;
 	else
 		tzdev->polling_delay = 0;
 
-	tzdev->mode = mode;
-
-	mutex_unlock(&tzdev->lock);
-
-	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
-
 	return 0;
 }
 
@@ -756,8 +741,11 @@ mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
 		return err;
 	}
 
-	module_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
-	return 0;
+	err = thermal_zone_device_enable(module_tz->tzdev);
+	if (err)
+		thermal_zone_device_unregister(module_tz->tzdev);
+
+	return err;
 }
 
 static void mlxsw_thermal_module_tz_fini(struct thermal_zone_device *tzdev)
@@ -860,6 +848,7 @@ static int
 mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
 {
 	char tz_name[MLXSW_THERMAL_ZONE_MAX_NAME];
+	int ret;
 
 	snprintf(tz_name, sizeof(tz_name), "mlxsw-gearbox%d",
 		 gearbox_tz->module + 1);
@@ -872,8 +861,11 @@ mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
 	if (IS_ERR(gearbox_tz->tzdev))
 		return PTR_ERR(gearbox_tz->tzdev);
 
-	gearbox_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
-	return 0;
+	ret = thermal_zone_device_enable(gearbox_tz->tzdev);
+	if (ret)
+		thermal_zone_device_unregister(gearbox_tz->tzdev);
+
+	return ret;
 }
 
 static void
@@ -1041,10 +1033,15 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
 	if (err)
 		goto err_unreg_modules_tzdev;
 
-	thermal->tzdev->mode = THERMAL_DEVICE_ENABLED;
+	err = thermal_zone_device_enable(thermal->tzdev);
+	if (err)
+		goto err_unreg_gearboxes;
+
 	*p_thermal = thermal;
 	return 0;
 
+err_unreg_gearboxes:
+	mlxsw_thermal_gearboxes_fini(thermal);
 err_unreg_modules_tzdev:
 	mlxsw_thermal_modules_fini(thermal);
 err_unreg_tzdev: