netdev - [patch net-next RFC 06/12] mlxsw: core: Modify thermal zone definition

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Message-Id: <1530015037-67361-7-git-send-email-vadimp@mellanox.com>
Date:   Tue, 26 Jun 2018 12:10:31 +0000
From:   Vadim Pasternak <vadimp@...lanox.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux@...ck-us.net, rui.zhang@...el.com,
        edubezval@...il.com, jiri@...nulli.us, mlxsw@...lanox.com,
        michaelsh@...lanox.com, Vadim Pasternak <vadimp@...lanox.com>
Subject: [patch net-next RFC 06/12] mlxsw: core: Modify thermal zone definition

Thermal zone trip points setting is modified for better alignment with
modified thermal algorithm.
The hysteresis thresholds for thermal trips are added in order to avoid
throttling around thermal trip point. If hysteresis temperature is not
considered PWM can have side effect of flip up/down on thermal trip
point boundary.

Signed-off-by: Vadim Pasternak <vadimp@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 63 ++++++++++++++--------
 1 file changed, 41 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index 152591d8..91c4946 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -39,16 +39,18 @@
 #include <linux/err.h>
 
 #include "core.h"
+#include "core_env.h"
 
-#define MLXSW_THERMAL_POLL_INT	1000	/* ms */
+#define MLXSW_THERMAL_POLL_INT		1000	/* ms */
 #define MLXSW_THERMAL_SLOW_POLL_INT	20000	/* ms */
-#define MLXSW_THERMAL_MAX_TEMP	110000	/* 110C */
-#define MLXSW_THERMAL_MAX_STATE	10
-#define MLXSW_THERMAL_MAX_DUTY	255
+#define MLXSW_THERMAL_HYSTERESIS_TEMP	5000	/* 5C */
+#define MLXSW_THERMAL_MAX_STATE		10
+#define MLXSW_THERMAL_MAX_DUTY		255
 
 struct mlxsw_thermal_trip {
 	int	type;
 	int	temp;
+	int	hyst;
 	int	min_state;
 	int	max_state;
 };
@@ -56,32 +58,29 @@ struct mlxsw_thermal_trip {
 static const struct mlxsw_thermal_trip default_thermal_trips[] = {
 	{	/* In range - 0-40% PWM */
 		.type		= THERMAL_TRIP_ACTIVE,
-		.temp		= 75000,
+		.temp		= MLXSW_ENV_TEMP_NORM,
+		.hyst		= MLXSW_THERMAL_HYSTERESIS_TEMP,
 		.min_state	= 0,
 		.max_state	= (4 * MLXSW_THERMAL_MAX_STATE) / 10,
 	},
-	{	/* High - 40-100% PWM */
-		.type		= THERMAL_TRIP_ACTIVE,
-		.temp		= 80000,
-		.min_state	= (4 * MLXSW_THERMAL_MAX_STATE) / 10,
-		.max_state	= MLXSW_THERMAL_MAX_STATE,
-	},
 	{
-		/* Very high - 100% PWM */
+		/* In range - 40-100% PWM */
 		.type		= THERMAL_TRIP_ACTIVE,
-		.temp		= 85000,
-		.min_state	= MLXSW_THERMAL_MAX_STATE,
+		.temp		= MLXSW_ENV_TEMP_HIGH,
+		.hyst		= MLXSW_THERMAL_HYSTERESIS_TEMP,
+		.min_state	= (4 * MLXSW_THERMAL_MAX_STATE) / 10,
 		.max_state	= MLXSW_THERMAL_MAX_STATE,
 	},
 	{	/* Warning */
 		.type		= THERMAL_TRIP_HOT,
-		.temp		= 105000,
+		.temp		= MLXSW_ENV_TEMP_HOT,
+		.hyst		= MLXSW_THERMAL_HYSTERESIS_TEMP,
 		.min_state	= MLXSW_THERMAL_MAX_STATE,
 		.max_state	= MLXSW_THERMAL_MAX_STATE,
 	},
 	{	/* Critical - soft poweroff */
 		.type		= THERMAL_TRIP_CRITICAL,
-		.temp		= MLXSW_THERMAL_MAX_TEMP,
+		.temp		= MLXSW_ENV_TEMP_CRIT,
 		.min_state	= MLXSW_THERMAL_MAX_STATE,
 		.max_state	= MLXSW_THERMAL_MAX_STATE,
 	}
@@ -257,22 +256,42 @@ static int mlxsw_thermal_set_trip_temp(struct thermal_zone_device *tzdev,
 	struct mlxsw_thermal *thermal = tzdev->devdata;
 
 	if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS ||
-	    temp > MLXSW_THERMAL_MAX_TEMP)
+	    temp > MLXSW_ENV_TEMP_CRIT)
 		return -EINVAL;
 
 	thermal->trips[trip].temp = temp;
 	return 0;
 }
 
+static int mlxsw_thermal_get_trip_hyst(struct thermal_zone_device *tzdev,
+				       int trip, int *p_hyst)
+{
+	struct mlxsw_thermal *thermal = tzdev->devdata;
+
+	*p_hyst = thermal->trips[trip].hyst;
+	return 0;
+}
+
+static int mlxsw_thermal_set_trip_hyst(struct thermal_zone_device *tzdev,
+				       int trip, int hyst)
+{
+	struct mlxsw_thermal *thermal = tzdev->devdata;
+
+	thermal->trips[trip].hyst = hyst;
+	return 0;
+}
+
 static struct thermal_zone_device_ops mlxsw_thermal_ops = {
-	.bind = mlxsw_thermal_bind,
-	.unbind = mlxsw_thermal_unbind,
-	.get_mode = mlxsw_thermal_get_mode,
-	.set_mode = mlxsw_thermal_set_mode,
-	.get_temp = mlxsw_thermal_get_temp,
+	.bind		= mlxsw_thermal_bind,
+	.unbind		= mlxsw_thermal_unbind,
+	.get_mode	= mlxsw_thermal_get_mode,
+	.set_mode	= mlxsw_thermal_set_mode,
+	.get_temp	= mlxsw_thermal_get_temp,
 	.get_trip_type	= mlxsw_thermal_get_trip_type,
 	.get_trip_temp	= mlxsw_thermal_get_trip_temp,
 	.set_trip_temp	= mlxsw_thermal_set_trip_temp,
+	.get_trip_hyst	= mlxsw_thermal_get_trip_hyst,
+	.set_trip_hyst	= mlxsw_thermal_set_trip_hyst,
 };
 
 static int mlxsw_thermal_get_max_state(struct thermal_cooling_device *cdev,
-- 
2.1.4