diff options
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/thermal/Makefile | 1 | ||||
| -rw-r--r-- | drivers/thermal/fair_share.c | 12 | ||||
| -rw-r--r-- | drivers/thermal/gov_bang_bang.c | 131 | ||||
| -rw-r--r-- | drivers/thermal/imx_thermal.c | 91 | ||||
| -rw-r--r-- | drivers/thermal/of-thermal.c | 12 | ||||
| -rw-r--r-- | drivers/thermal/step_wise.c | 7 | ||||
| -rw-r--r-- | drivers/thermal/thermal_core.c | 12 | ||||
| -rw-r--r-- | drivers/thermal/thermal_core.h | 8 |
9 files changed, 269 insertions, 15 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index e65ca2f8917e..9b012ff65220 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 39b85b5b45fc..39c4fe87da2f 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..fdd1f523a1ed 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" @@ -76,7 +77,7 @@ static unsigned long get_target_state(struct thermal_instance *instance, next_target = instance->upper; break; case THERMAL_TREND_DROPPING: - if (cur_state == instance->lower) { + if (cur_state <= instance->lower) { if (!throttle) next_target = THERMAL_NO_TARGET; } else { @@ -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); |