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-rw-r--r--Documentation/devicetree/bindings/thermal/imx-thermal.txt5
-rw-r--r--drivers/thermal/Kconfig10
-rw-r--r--drivers/thermal/Makefile1
-rw-r--r--drivers/thermal/fair_share.c12
-rw-r--r--drivers/thermal/gov_bang_bang.c131
-rw-r--r--drivers/thermal/imx_thermal.c91
-rw-r--r--drivers/thermal/of-thermal.c12
-rw-r--r--drivers/thermal/step_wise.c5
-rw-r--r--drivers/thermal/thermal_core.c12
-rw-r--r--drivers/thermal/thermal_core.h8
-rw-r--r--include/trace/events/thermal.h83
11 files changed, 355 insertions, 15 deletions
diff --git a/Documentation/devicetree/bindings/thermal/imx-thermal.txt b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
index 1f0f67234a91..3c67bd50aa10 100644
--- a/Documentation/devicetree/bindings/thermal/imx-thermal.txt
+++ b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
@@ -1,7 +1,10 @@
* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs
Required properties:
-- compatible : "fsl,imx6q-thermal"
+- compatible : "fsl,imx6q-tempmon" for i.MX6Q, "fsl,imx6sx-tempmon" for i.MX6SX.
+ i.MX6SX has two more IRQs than i.MX6Q, one is IRQ_LOW and the other is IRQ_PANIC,
+ when temperature is below than low threshold, IRQ_LOW will be triggered, when temperature
+ is higher than panic threshold, system will auto reboot by SRC module.
- fsl,tempmon : phandle pointer to system controller that contains TEMPMON
control registers, e.g. ANATOP on imx6q.
- fsl,tempmon-data : phandle pointer to fuse controller that contains TEMPMON
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index ef5587fe2c69..f5216db30e23 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -84,6 +84,16 @@ config THERMAL_GOV_STEP_WISE
Enable this to manage platform thermals using a simple linear
governor.
+config THERMAL_GOV_BANG_BANG
+ bool "Bang Bang thermal governor"
+ default n
+ help
+ Enable this to manage platform thermals using bang bang governor.
+
+ Say 'Y' here if you want to use two point temperature regulation
+ used for fans without throttling. Some fan drivers depend on this
+ governor to be enabled (e.g. acerhdf).
+
config THERMAL_GOV_USER_SPACE
bool "User_space thermal governor"
help
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 31e232f84b6b..b7e65423d7b6 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -11,6 +11,7 @@ thermal_sys-$(CONFIG_THERMAL_OF) += of-thermal.o
# governors
thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += fair_share.o
+thermal_sys-$(CONFIG_THERMAL_GOV_BANG_BANG) += gov_bang_bang.o
thermal_sys-$(CONFIG_THERMAL_GOV_STEP_WISE) += step_wise.o
thermal_sys-$(CONFIG_THERMAL_GOV_USER_SPACE) += user_space.o
diff --git a/drivers/thermal/fair_share.c b/drivers/thermal/fair_share.c
index 944ba2f340c8..6e0a3fbfae86 100644
--- a/drivers/thermal/fair_share.c
+++ b/drivers/thermal/fair_share.c
@@ -23,6 +23,7 @@
*/
#include <linux/thermal.h>
+#include <trace/events/thermal.h>
#include "thermal_core.h"
@@ -34,6 +35,7 @@ static int get_trip_level(struct thermal_zone_device *tz)
{
int count = 0;
unsigned long trip_temp;
+ enum thermal_trip_type trip_type;
if (tz->trips == 0 || !tz->ops->get_trip_temp)
return 0;
@@ -43,6 +45,16 @@ static int get_trip_level(struct thermal_zone_device *tz)
if (tz->temperature < trip_temp)
break;
}
+
+ /*
+ * count > 0 only if temperature is greater than first trip
+ * point, in which case, trip_point = count - 1
+ */
+ if (count > 0) {
+ tz->ops->get_trip_type(tz, count - 1, &trip_type);
+ trace_thermal_zone_trip(tz, count - 1, trip_type);
+ }
+
return count;
}
diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c
new file mode 100644
index 000000000000..c5dd76b2ee74
--- /dev/null
+++ b/drivers/thermal/gov_bang_bang.c
@@ -0,0 +1,131 @@
+/*
+ * gov_bang_bang.c - A simple thermal throttling governor using hysteresis
+ *
+ * Copyright (C) 2014 Peter Feuerer <peter@piie.net>
+ *
+ * Based on step_wise.c with following Copyrights:
+ * Copyright (C) 2012 Intel Corp
+ * Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ */
+
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
+{
+ long trip_temp;
+ unsigned long trip_hyst;
+ struct thermal_instance *instance;
+
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
+ tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
+
+ dev_dbg(&tz->device, "Trip%d[temp=%ld]:temp=%d:hyst=%ld\n",
+ trip, trip_temp, tz->temperature,
+ trip_hyst);
+
+ mutex_lock(&tz->lock);
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip)
+ continue;
+
+ /* in case fan is in initial state, switch the fan off */
+ if (instance->target == THERMAL_NO_TARGET)
+ instance->target = 0;
+
+ /* in case fan is neither on nor off set the fan to active */
+ if (instance->target != 0 && instance->target != 1) {
+ pr_warn("Thermal instance %s controlled by bang-bang has unexpected state: %ld\n",
+ instance->name, instance->target);
+ instance->target = 1;
+ }
+
+ /*
+ * enable fan when temperature exceeds trip_temp and disable
+ * the fan in case it falls below trip_temp minus hysteresis
+ */
+ if (instance->target == 0 && tz->temperature >= trip_temp)
+ instance->target = 1;
+ else if (instance->target == 1 &&
+ tz->temperature < trip_temp - trip_hyst)
+ instance->target = 0;
+
+ dev_dbg(&instance->cdev->device, "target=%d\n",
+ (int)instance->target);
+
+ instance->cdev->updated = false; /* cdev needs update */
+ }
+
+ mutex_unlock(&tz->lock);
+}
+
+/**
+ * bang_bang_control - controls devices associated with the given zone
+ * @tz - thermal_zone_device
+ * @trip - the trip point
+ *
+ * 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 int bang_bang_control(struct thermal_zone_device *tz, int trip)
+{
+ struct thermal_instance *instance;
+
+ thermal_zone_trip_update(tz, trip);
+
+ mutex_lock(&tz->lock);
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node)
+ thermal_cdev_update(instance->cdev);
+
+ mutex_unlock(&tz->lock);
+
+ return 0;
+}
+
+static struct thermal_governor thermal_gov_bang_bang = {
+ .name = "bang_bang",
+ .throttle = bang_bang_control,
+};
+
+int thermal_gov_bang_bang_register(void)
+{
+ return thermal_register_governor(&thermal_gov_bang_bang);
+}
+
+void thermal_gov_bang_bang_unregister(void)
+{
+ thermal_unregister_governor(&thermal_gov_bang_bang);
+}
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index 2c516f2eebed..461bf3d033a0 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -19,6 +19,7 @@
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
@@ -31,6 +32,11 @@
#define MISC0 0x0150
#define MISC0_REFTOP_SELBIASOFF (1 << 3)
+#define MISC1 0x0160
+#define MISC1_IRQ_TEMPHIGH (1 << 29)
+/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
+#define MISC1_IRQ_TEMPLOW (1 << 28)
+#define MISC1_IRQ_TEMPPANIC (1 << 27)
#define TEMPSENSE0 0x0180
#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
@@ -43,6 +49,12 @@
#define TEMPSENSE1 0x0190
#define TEMPSENSE1_MEASURE_FREQ 0xffff
+/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
+#define TEMPSENSE2 0x0290
+#define TEMPSENSE2_LOW_VALUE_SHIFT 0
+#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
+#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
+#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
#define OCOTP_ANA1 0x04e0
@@ -66,6 +78,21 @@ enum imx_thermal_trip {
#define FACTOR1 15976
#define FACTOR2 4297157
+#define TEMPMON_IMX6Q 1
+#define TEMPMON_IMX6SX 2
+
+struct thermal_soc_data {
+ u32 version;
+};
+
+static struct thermal_soc_data thermal_imx6q_data = {
+ .version = TEMPMON_IMX6Q,
+};
+
+static struct thermal_soc_data thermal_imx6sx_data = {
+ .version = TEMPMON_IMX6SX,
+};
+
struct imx_thermal_data {
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev;
@@ -79,8 +106,21 @@ struct imx_thermal_data {
bool irq_enabled;
int irq;
struct clk *thermal_clk;
+ const struct thermal_soc_data *socdata;
};
+static void imx_set_panic_temp(struct imx_thermal_data *data,
+ signed long panic_temp)
+{
+ struct regmap *map = data->tempmon;
+ int critical_value;
+
+ critical_value = (data->c2 - panic_temp) / data->c1;
+ regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
+ regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
+ TEMPSENSE2_PANIC_VALUE_SHIFT);
+}
+
static void imx_set_alarm_temp(struct imx_thermal_data *data,
signed long alarm_temp)
{
@@ -142,13 +182,17 @@ static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
/* See imx_get_sensor_data() for formula derivation */
*temp = data->c2 - n_meas * data->c1;
- /* Update alarm value to next higher trip point */
- if (data->alarm_temp == data->temp_passive && *temp >= data->temp_passive)
- imx_set_alarm_temp(data, data->temp_critical);
- if (data->alarm_temp == data->temp_critical && *temp < data->temp_passive) {
- imx_set_alarm_temp(data, data->temp_passive);
- dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
- data->alarm_temp / 1000);
+ /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
+ if (data->socdata->version == TEMPMON_IMX6Q) {
+ if (data->alarm_temp == data->temp_passive &&
+ *temp >= data->temp_passive)
+ imx_set_alarm_temp(data, data->temp_critical);
+ if (data->alarm_temp == data->temp_critical &&
+ *temp < data->temp_passive) {
+ imx_set_alarm_temp(data, data->temp_passive);
+ dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
+ data->alarm_temp / 1000);
+ }
}
if (*temp != data->last_temp) {
@@ -398,8 +442,17 @@ static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
return IRQ_HANDLED;
}
+static const struct of_device_id of_imx_thermal_match[] = {
+ { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
+ { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
+ { /* end */ }
+};
+MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
+
static int imx_thermal_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id =
+ of_match_device(of_imx_thermal_match, &pdev->dev);
struct imx_thermal_data *data;
struct cpumask clip_cpus;
struct regmap *map;
@@ -418,6 +471,20 @@ static int imx_thermal_probe(struct platform_device *pdev)
}
data->tempmon = map;
+ data->socdata = of_id->data;
+
+ /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
+ if (data->socdata->version == TEMPMON_IMX6SX) {
+ regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
+ MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
+ /*
+ * reset value of LOW ALARM is incorrect, set it to lowest
+ * value to avoid false trigger of low alarm.
+ */
+ regmap_write(map, TEMPSENSE2 + REG_SET,
+ TEMPSENSE2_LOW_VALUE_MASK);
+ }
+
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
@@ -489,6 +556,10 @@ static int imx_thermal_probe(struct platform_device *pdev)
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
imx_set_alarm_temp(data, data->temp_passive);
+
+ if (data->socdata->version == TEMPMON_IMX6SX)
+ imx_set_panic_temp(data, data->temp_critical);
+
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
@@ -550,12 +621,6 @@ static int imx_thermal_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
imx_thermal_suspend, imx_thermal_resume);
-static const struct of_device_id of_imx_thermal_match[] = {
- { .compatible = "fsl,imx6q-tempmon", },
- { /* end */ }
-};
-MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
-
static struct platform_driver imx_thermal = {
.driver = {
.name = "imx_thermal",
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 4b2b999b7611..f8eb625b8400 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -401,6 +401,10 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
struct of_phandle_args sensor_specs;
int ret, id;
+ /* Check whether child is enabled or not */
+ if (!of_device_is_available(child))
+ continue;
+
/* For now, thermal framework supports only 1 sensor per zone */
ret = of_parse_phandle_with_args(child, "thermal-sensors",
"#thermal-sensor-cells",
@@ -771,6 +775,10 @@ int __init of_parse_thermal_zones(void)
struct thermal_zone_device *zone;
struct thermal_zone_params *tzp;
+ /* Check whether child is enabled or not */
+ if (!of_device_is_available(child))
+ continue;
+
tz = thermal_of_build_thermal_zone(child);
if (IS_ERR(tz)) {
pr_err("failed to build thermal zone %s: %ld\n",
@@ -838,6 +846,10 @@ void of_thermal_destroy_zones(void)
for_each_child_of_node(np, child) {
struct thermal_zone_device *zone;
+ /* Check whether child is enabled or not */
+ if (!of_device_is_available(child))
+ continue;
+
zone = thermal_zone_get_zone_by_name(child->name);
if (IS_ERR(zone))
continue;
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index f251521baaa2..3b54c2c226d8 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -23,6 +23,7 @@
*/
#include <linux/thermal.h>
+#include <trace/events/thermal.h>
#include "thermal_core.h"
@@ -129,8 +130,10 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
trend = get_tz_trend(tz, trip);
- if (tz->temperature >= trip_temp)
+ if (tz->temperature >= trip_temp) {
throttle = true;
+ trace_thermal_zone_trip(tz, trip, trip_type);
+ }
dev_dbg(&tz->device, "Trip%d[type=%d,temp=%ld]:trend=%d,throttle=%d\n",
trip, trip_type, trip_temp, trend, throttle);
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 71b0ec0c370d..976b8aee1da4 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -38,6 +38,9 @@
#include <net/netlink.h>
#include <net/genetlink.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/thermal.h>
+
#include "thermal_core.h"
#include "thermal_hwmon.h"
@@ -368,6 +371,8 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
if (tz->temperature < trip_temp)
return;
+ trace_thermal_zone_trip(tz, trip, trip_type);
+
if (tz->ops->notify)
tz->ops->notify(tz, trip, trip_type);
@@ -463,6 +468,7 @@ static void update_temperature(struct thermal_zone_device *tz)
tz->temperature = temp;
mutex_unlock(&tz->lock);
+ trace_thermal_temperature(tz);
dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
tz->last_temperature, tz->temperature);
}
@@ -1287,6 +1293,7 @@ void thermal_cdev_update(struct thermal_cooling_device *cdev)
mutex_unlock(&cdev->lock);
cdev->ops->set_cur_state(cdev, target);
cdev->updated = true;
+ trace_cdev_update(cdev, target);
dev_dbg(&cdev->device, "set to state %lu\n", target);
}
EXPORT_SYMBOL(thermal_cdev_update);
@@ -1790,6 +1797,10 @@ static int __init thermal_register_governors(void)
if (result)
return result;
+ result = thermal_gov_bang_bang_register();
+ if (result)
+ return result;
+
return thermal_gov_user_space_register();
}
@@ -1797,6 +1808,7 @@ static void thermal_unregister_governors(void)
{
thermal_gov_step_wise_unregister();
thermal_gov_fair_share_unregister();
+ thermal_gov_bang_bang_unregister();
thermal_gov_user_space_unregister();
}
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index 3db339fb636f..d15d243de27a 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -69,6 +69,14 @@ static inline int thermal_gov_fair_share_register(void) { return 0; }
static inline void thermal_gov_fair_share_unregister(void) {}
#endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
+#ifdef CONFIG_THERMAL_GOV_BANG_BANG
+int thermal_gov_bang_bang_register(void);
+void thermal_gov_bang_bang_unregister(void);
+#else
+static inline int thermal_gov_bang_bang_register(void) { return 0; }
+static inline void thermal_gov_bang_bang_unregister(void) {}
+#endif /* CONFIG_THERMAL_GOV_BANG_BANG */
+
#ifdef CONFIG_THERMAL_GOV_USER_SPACE
int thermal_gov_user_space_register(void);
void thermal_gov_user_space_unregister(void);
diff --git a/include/trace/events/thermal.h b/include/trace/events/thermal.h
new file mode 100644
index 000000000000..0f4f95d63c03
--- /dev/null
+++ b/include/trace/events/thermal.h
@@ -0,0 +1,83 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM thermal
+
+#if !defined(_TRACE_THERMAL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_THERMAL_H
+
+#include <linux/thermal.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(thermal_temperature,
+
+ TP_PROTO(struct thermal_zone_device *tz),
+
+ TP_ARGS(tz),
+
+ TP_STRUCT__entry(
+ __string(thermal_zone, tz->type)
+ __field(int, id)
+ __field(int, temp_prev)
+ __field(int, temp)
+ ),
+
+ TP_fast_assign(
+ __assign_str(thermal_zone, tz->type);
+ __entry->id = tz->id;
+ __entry->temp_prev = tz->last_temperature;
+ __entry->temp = tz->temperature;
+ ),
+
+ TP_printk("thermal_zone=%s id=%d temp_prev=%d temp=%d",
+ __get_str(thermal_zone), __entry->id, __entry->temp_prev,
+ __entry->temp)
+);
+
+TRACE_EVENT(cdev_update,
+
+ TP_PROTO(struct thermal_cooling_device *cdev, unsigned long target),
+
+ TP_ARGS(cdev, target),
+
+ TP_STRUCT__entry(
+ __string(type, cdev->type)
+ __field(unsigned long, target)
+ ),
+
+ TP_fast_assign(
+ __assign_str(type, cdev->type);
+ __entry->target = target;
+ ),
+
+ TP_printk("type=%s target=%lu", __get_str(type), __entry->target)
+);
+
+TRACE_EVENT(thermal_zone_trip,
+
+ TP_PROTO(struct thermal_zone_device *tz, int trip,
+ enum thermal_trip_type trip_type),
+
+ TP_ARGS(tz, trip, trip_type),
+
+ TP_STRUCT__entry(
+ __string(thermal_zone, tz->type)
+ __field(int, id)
+ __field(int, trip)
+ __field(enum thermal_trip_type, trip_type)
+ ),
+
+ TP_fast_assign(
+ __assign_str(thermal_zone, tz->type);
+ __entry->id = tz->id;
+ __entry->trip = trip;
+ __entry->trip_type = trip_type;
+ ),
+
+ TP_printk("thermal_zone=%s id=%d trip=%d trip_type=%d",
+ __get_str(thermal_zone), __entry->id, __entry->trip,
+ __entry->trip_type)
+);
+
+#endif /* _TRACE_THERMAL_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-05 10:06:29 +0000