From: Daniel Lezcano daniel.lezcano@linaro.org

commit ff4ec2997df8fe7cc40513dbe5f86d9f88fb6be7 upstream.

By essence, the tsensor does not really support multiple sensor at the same time. It allows to set a sensor and use it to get the temperature, another sensor could be switched but with a delay of 3-5ms. It is difficult to read simultaneously several sensors without a big delay.

Today, just one sensor is used, it is not necessary to deal with multiple sensors in the code. Remove them and if it is needed in the future add them on top of a code which will be clean up in the meantime.

Link: https://bugs.linaro.org/show_bug.cgi?id=4053 (PATCH 1/5) Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Reviewed-by: Leo Yan leo.yan@linaro.org Acked-by: Wangtao (Kevin, Kirin) kevin.wangtao@hisilicon.com Signed-off-by: Eduardo Valentin edubezval@gmail.com (cherry picked from commit ff4ec2997df8fe7cc40513dbe5f86d9f88fb6be7) Signed-off-by: Rafael David Tinoco rafael.tinoco@linaro.org --- drivers/thermal/hisi_thermal.c | 75 +++++++++------------------------- 1 file changed, 19 insertions(+), 56 deletions(-)

diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c index 6d8906d65476..aecbfe9fc8f2 100644 --- a/drivers/thermal/hisi_thermal.c +++ b/drivers/thermal/hisi_thermal.c @@ -40,6 +40,7 @@ #define HISI_TEMP_STEP (784)

#define HISI_MAX_SENSORS 4 +#define HISI_DEFAULT_SENSOR 2

struct hisi_thermal_sensor { struct hisi_thermal_data *thermal; @@ -54,9 +55,8 @@ struct hisi_thermal_data { struct mutex thermal_lock; /* protects register data */ struct platform_device *pdev; struct clk *clk; - struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS]; - - int irq, irq_bind_sensor; + struct hisi_thermal_sensor sensors; + int irq; bool irq_enabled;

void __iomem *regs; @@ -133,7 +133,7 @@ static void hisi_thermal_enable_bind_irq_sensor

mutex_lock(&data->thermal_lock);

- sensor = &data->sensors[data->irq_bind_sensor]; + sensor = &data->sensors;

/* setting the hdak time */ writel(0x0, data->regs + TEMP0_CFG); @@ -181,31 +181,8 @@ static int hisi_thermal_get_temp(void *_sensor, int *temp) struct hisi_thermal_sensor *sensor = _sensor; struct hisi_thermal_data *data = sensor->thermal;

- int sensor_id = -1, i; - long max_temp = 0; - *temp = hisi_thermal_get_sensor_temp(data, sensor);

- sensor->sensor_temp = *temp; - - for (i = 0; i < HISI_MAX_SENSORS; i++) { - if (!data->sensors[i].tzd) - continue; - - if (data->sensors[i].sensor_temp >= max_temp) { - max_temp = data->sensors[i].sensor_temp; - sensor_id = i; - } - } - - /* If no sensor has been enabled, then skip to enable irq */ - if (sensor_id == -1) - return 0; - - mutex_lock(&data->thermal_lock); - data->irq_bind_sensor = sensor_id; - mutex_unlock(&data->thermal_lock); - dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n", sensor->id, data->irq_enabled, *temp, sensor->thres_temp); /* @@ -218,7 +195,7 @@ static int hisi_thermal_get_temp(void *_sensor, int *temp) return 0; }

- if (max_temp < sensor->thres_temp) { + if (*temp < sensor->thres_temp) { data->irq_enabled = true; hisi_thermal_enable_bind_irq_sensor(data); enable_irq(data->irq); @@ -245,22 +222,16 @@ static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) { struct hisi_thermal_data *data = dev; struct hisi_thermal_sensor *sensor; - int i;

mutex_lock(&data->thermal_lock); - sensor = &data->sensors[data->irq_bind_sensor]; + sensor = &data->sensors;

dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n", sensor->thres_temp); mutex_unlock(&data->thermal_lock);

- for (i = 0; i < HISI_MAX_SENSORS; i++) { - if (!data->sensors[i].tzd) - continue; - - thermal_zone_device_update(data->sensors[i].tzd, - THERMAL_EVENT_UNSPECIFIED); - } + thermal_zone_device_update(data->sensors.tzd, + THERMAL_EVENT_UNSPECIFIED);

return IRQ_HANDLED; } @@ -317,7 +288,6 @@ static int hisi_thermal_probe(struct platform_device *pdev) { struct hisi_thermal_data *data; struct resource *res; - int i; int ret;

data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); @@ -359,14 +329,13 @@ static int hisi_thermal_probe(struct platform_device *pdev) hisi_thermal_enable_bind_irq_sensor(data); data->irq_enabled = true;

- for (i = 0; i < HISI_MAX_SENSORS; ++i) { - ret = hisi_thermal_register_sensor(pdev, data, - &data->sensors[i], i); - if (ret) - dev_err(&pdev->dev, - "failed to register thermal sensor: %d\n", ret); - else - hisi_thermal_toggle_sensor(&data->sensors[i], true); + ret = hisi_thermal_register_sensor(pdev, data, + &data->sensors, + HISI_DEFAULT_SENSOR); + if (ret) { + dev_err(&pdev->dev, "failed to register thermal sensor: %d\n", + ret); + return ret; }

ret = devm_request_threaded_irq(&pdev->dev, data->irq, @@ -378,6 +347,8 @@ static int hisi_thermal_probe(struct platform_device *pdev) return ret; }

+ hisi_thermal_toggle_sensor(&data->sensors, true); + enable_irq(data->irq);

return 0; @@ -386,17 +357,9 @@ static int hisi_thermal_probe(struct platform_device *pdev) static int hisi_thermal_remove(struct platform_device *pdev) { struct hisi_thermal_data *data = platform_get_drvdata(pdev); - int i; - - for (i = 0; i < HISI_MAX_SENSORS; i++) { - struct hisi_thermal_sensor *sensor = &data->sensors[i]; - - if (!sensor->tzd) - continue; - - hisi_thermal_toggle_sensor(sensor, false); - } + struct hisi_thermal_sensor *sensor = &data->sensors;

+ hisi_thermal_toggle_sensor(sensor, false); hisi_thermal_disable_sensor(data); clk_disable_unprepare(data->clk);

From: Daniel Lezcano daniel.lezcano@linaro.org

commit 1e11b014271ceccb5ea04ae58f4829ac8209a86d upstream.

Hopefully, the function name can help to clarify the semantic of the operations when writing in the register.

Link: https://bugs.linaro.org/show_bug.cgi?id=4053 (PATCH 3/5) Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Signed-off-by: Eduardo Valentin edubezval@gmail.com (cherry picked from commit 1e11b014271ceccb5ea04ae58f4829ac8209a86d) Signed-off-by: Rafael David Tinoco rafael.tinoco@linaro.org --- drivers/thermal/hisi_thermal.c | 92 ++++++++++++++++++++++++++-------- 1 file changed, 70 insertions(+), 22 deletions(-)

diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c index 0c2966c285b1..a803043f37ae 100644 --- a/drivers/thermal/hisi_thermal.c +++ b/drivers/thermal/hisi_thermal.c @@ -26,6 +26,7 @@

#include "thermal_core.h"

+#define TEMP0_LAG (0x0) #define TEMP0_TH (0x4) #define TEMP0_RST_TH (0x8) #define TEMP0_CFG (0xC) @@ -96,6 +97,56 @@ static inline long hisi_thermal_round_temp(int temp) hisi_thermal_temp_to_step(temp)); }

+static inline void hisi_thermal_set_lag(void __iomem *addr, int value) +{ + writel(value, addr + TEMP0_LAG); +} + +static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value) +{ + writel(value, addr + TEMP0_INT_CLR); +} + +static inline void hisi_thermal_alarm_enable(void __iomem *addr, int value) +{ + writel(value, addr + TEMP0_INT_EN); +} + +static inline void hisi_thermal_alarm_set(void __iomem *addr, int temp) +{ + writel(hisi_thermal_temp_to_step(temp) | 0x0FFFFFF00, addr + TEMP0_TH); +} + +static inline void hisi_thermal_reset_set(void __iomem *addr, int temp) +{ + writel(hisi_thermal_temp_to_step(temp), addr + TEMP0_RST_TH); +} + +static inline void hisi_thermal_reset_enable(void __iomem *addr, int value) +{ + writel(value, addr + TEMP0_RST_MSK); +} + +static inline void hisi_thermal_enable(void __iomem *addr, int value) +{ + writel(value, addr + TEMP0_EN); +} + +static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor) +{ + writel((sensor << 12), addr + TEMP0_CFG); +} + +static inline int hisi_thermal_get_temperature(void __iomem *addr) +{ + return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE)); +} + +static inline void hisi_thermal_hdak_set(void __iomem *addr, int value) +{ + writel(value, addr + TEMP0_CFG); +} + static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data, struct hisi_thermal_sensor *sensor) { @@ -104,22 +155,21 @@ static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data, mutex_lock(&data->thermal_lock);

/* disable interrupt */ - writel(0x0, data->regs + TEMP0_INT_EN); - writel(0x1, data->regs + TEMP0_INT_CLR); + hisi_thermal_alarm_enable(data->regs, 0); + hisi_thermal_alarm_clear(data->regs, 1);

/* disable module firstly */ - writel(0x0, data->regs + TEMP0_EN); + hisi_thermal_enable(data->regs, 0);

/* select sensor id */ - writel((sensor->id << 12), data->regs + TEMP0_CFG); + hisi_thermal_sensor_select(data->regs, sensor->id);

/* enable module */ - writel(0x1, data->regs + TEMP0_EN); + hisi_thermal_enable(data->regs, 1);

usleep_range(3000, 5000);

- val = readl(data->regs + TEMP0_VALUE); - val = hisi_thermal_step_to_temp(val); + val = hisi_thermal_get_temperature(data->regs);

mutex_unlock(&data->thermal_lock);

@@ -136,28 +186,26 @@ static void hisi_thermal_enable_bind_irq_sensor sensor = &data->sensors;

/* setting the hdak time */ - writel(0x0, data->regs + TEMP0_CFG); + hisi_thermal_hdak_set(data->regs, 0);

/* disable module firstly */ - writel(0x0, data->regs + TEMP0_RST_MSK); - writel(0x0, data->regs + TEMP0_EN); + hisi_thermal_reset_enable(data->regs, 0); + hisi_thermal_enable(data->regs, 0);

/* select sensor id */ - writel((sensor->id << 12), data->regs + TEMP0_CFG); + hisi_thermal_sensor_select(data->regs, sensor->id);

/* enable for interrupt */ - writel(hisi_thermal_temp_to_step(sensor->thres_temp) | 0x0FFFFFF00, - data->regs + TEMP0_TH); + hisi_thermal_alarm_set(data->regs, sensor->thres_temp);

- writel(hisi_thermal_temp_to_step(HISI_TEMP_RESET), - data->regs + TEMP0_RST_TH); + hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET);

/* enable module */ - writel(0x1, data->regs + TEMP0_RST_MSK); - writel(0x1, data->regs + TEMP0_EN); + hisi_thermal_reset_enable(data->regs, 1); + hisi_thermal_enable(data->regs, 1);

- writel(0x0, data->regs + TEMP0_INT_CLR); - writel(0x1, data->regs + TEMP0_INT_EN); + hisi_thermal_alarm_clear(data->regs, 0); + hisi_thermal_alarm_enable(data->regs, 1);

usleep_range(3000, 5000);

@@ -169,9 +217,9 @@ static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data) mutex_lock(&data->thermal_lock);

/* disable sensor module */ - writel(0x0, data->regs + TEMP0_INT_EN); - writel(0x0, data->regs + TEMP0_RST_MSK); - writel(0x0, data->regs + TEMP0_EN); + hisi_thermal_enable(data->regs, 0); + hisi_thermal_alarm_enable(data->regs, 0); + hisi_thermal_reset_enable(data->regs, 0);

mutex_unlock(&data->thermal_lock); }

From: Daniel Lezcano daniel.lezcano@linaro.org

commit 10d7e9a9181f4637640f388d334c6740c1b5d0e8 upstream.

The sensor is all setup, bind, resetted, acked, etc... every single second.

That was the way to workaround a problem with the interrupt bouncing again and again.

With the following changes, we fix all in one:

- Do the setup, one time, at probe time

- Add the IRQF_ONESHOT, ack the interrupt in the threaded handler

- Remove the interrupt handler

- Set the correct value for the LAG register

- Remove all the irq_enabled stuff in the code as the interruption handling is fixed

- Remove the 3ms delay

- Reorder the initialization routine to be in the right order

It ends up to a nicer code and more efficient, the 3-5ms delay is removed from the get_temp() path.

Link: https://bugs.linaro.org/show_bug.cgi?id=4053 (PATCH 5/5) Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Reviewed-by: Leo Yan leo.yan@linaro.org Tested-by: Leo Yan leo.yan@linaro.org Signed-off-by: Eduardo Valentin edubezval@gmail.com (cherry picked from commit 10d7e9a9181f4637640f388d334c6740c1b5d0e8) Signed-off-by: Rafael David Tinoco rafael.tinoco@linaro.org --- drivers/thermal/hisi_thermal.c | 203 +++++++++++++++------------------ 1 file changed, 93 insertions(+), 110 deletions(-)

diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c index 31b52ebf426f..7c5d4647cb5e 100644 --- a/drivers/thermal/hisi_thermal.c +++ b/drivers/thermal/hisi_thermal.c @@ -41,6 +41,7 @@ #define HISI_TEMP_BASE (-60000) #define HISI_TEMP_RESET (100000) #define HISI_TEMP_STEP (784) +#define HISI_TEMP_LAG (3500)

#define HISI_MAX_SENSORS 4 #define HISI_DEFAULT_SENSOR 2 @@ -60,8 +61,6 @@ struct hisi_thermal_data { struct clk *clk; struct hisi_thermal_sensor sensors; int irq; - bool irq_enabled; - void __iomem *regs; };

@@ -99,9 +98,40 @@ static inline long hisi_thermal_round_temp(int temp) hisi_thermal_temp_to_step(temp)); }

+/* + * The lag register contains 5 bits encoding the temperature in steps. + * + * Each time the temperature crosses the threshold boundary, an + * interrupt is raised. It could be when the temperature is going + * above the threshold or below. However, if the temperature is + * fluctuating around this value due to the load, we can receive + * several interrupts which may not desired. + * + * We can setup a temperature representing the delta between the + * threshold and the current temperature when the temperature is + * decreasing. + * + * For instance: the lag register is 5°C, the threshold is 65°C, when + * the temperature reaches 65°C an interrupt is raised and when the + * temperature decrease to 65°C - 5°C another interrupt is raised. + * + * A very short lag can lead to an interrupt storm, a long lag + * increase the latency to react to the temperature changes. In our + * case, that is not really a problem as we are polling the + * temperature. + * + * [0:4] : lag register + * + * The temperature is coded in steps, cf. HISI_TEMP_STEP. + * + * Min : 0x00 : 0.0 °C + * Max : 0x1F : 24.3 °C + * + * The 'value' parameter is in milliCelsius. + */ static inline void hisi_thermal_set_lag(void __iomem *addr, int value) { - writel(value, addr + TEMP0_LAG); + writel((value / HISI_TEMP_STEP) & 0x1F, addr + TEMP0_LAG); }

static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value) @@ -171,71 +201,6 @@ static inline void hisi_thermal_hdak_set(void __iomem *addr, int value) (value << 4), addr + TEMP0_CFG); }

-static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data, - struct hisi_thermal_sensor *sensor) -{ - long val; - - mutex_lock(&data->thermal_lock); - - /* disable interrupt */ - hisi_thermal_alarm_enable(data->regs, 0); - hisi_thermal_alarm_clear(data->regs, 1); - - /* disable module firstly */ - hisi_thermal_enable(data->regs, 0); - - /* select sensor id */ - hisi_thermal_sensor_select(data->regs, sensor->id); - - /* enable module */ - hisi_thermal_enable(data->regs, 1); - - usleep_range(3000, 5000); - - val = hisi_thermal_get_temperature(data->regs); - - mutex_unlock(&data->thermal_lock); - - return val; -} - -static void hisi_thermal_enable_bind_irq_sensor - (struct hisi_thermal_data *data) -{ - struct hisi_thermal_sensor *sensor; - - mutex_lock(&data->thermal_lock); - - sensor = &data->sensors; - - /* setting the hdak time */ - hisi_thermal_hdak_set(data->regs, 0); - - /* disable module firstly */ - hisi_thermal_reset_enable(data->regs, 0); - hisi_thermal_enable(data->regs, 0); - - /* select sensor id */ - hisi_thermal_sensor_select(data->regs, sensor->id); - - /* enable for interrupt */ - hisi_thermal_alarm_set(data->regs, sensor->thres_temp); - - hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET); - - /* enable module */ - hisi_thermal_reset_enable(data->regs, 1); - hisi_thermal_enable(data->regs, 1); - - hisi_thermal_alarm_clear(data->regs, 0); - hisi_thermal_alarm_enable(data->regs, 1); - - usleep_range(3000, 5000); - - mutex_unlock(&data->thermal_lock); -} - static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data) { mutex_lock(&data->thermal_lock); @@ -253,25 +218,10 @@ static int hisi_thermal_get_temp(void *_sensor, int *temp) struct hisi_thermal_sensor *sensor = _sensor; struct hisi_thermal_data *data = sensor->thermal;

- *temp = hisi_thermal_get_sensor_temp(data, sensor); - - dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n", - sensor->id, data->irq_enabled, *temp, sensor->thres_temp); - /* - * Bind irq to sensor for two cases: - * Reenable alarm IRQ if temperature below threshold; - * if irq has been enabled, always set it; - */ - if (data->irq_enabled) { - hisi_thermal_enable_bind_irq_sensor(data); - return 0; - } + *temp = hisi_thermal_get_temperature(data->regs);

- if (*temp < sensor->thres_temp) { - data->irq_enabled = true; - hisi_thermal_enable_bind_irq_sensor(data); - enable_irq(data->irq); - } + dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n", + sensor->id, *temp, sensor->thres_temp);

return 0; } @@ -280,26 +230,27 @@ static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = { .get_temp = hisi_thermal_get_temp, };

-static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev) +static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) { struct hisi_thermal_data *data = dev; + struct hisi_thermal_sensor *sensor = &data->sensors; + int temp;

- disable_irq_nosync(irq); - data->irq_enabled = false; + hisi_thermal_alarm_clear(data->regs, 1);

- return IRQ_WAKE_THREAD; -} + temp = hisi_thermal_get_temperature(data->regs);

-static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) -{ - struct hisi_thermal_data *data = dev; - struct hisi_thermal_sensor *sensor = &data->sensors; + if (temp >= sensor->thres_temp) { + dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n", + temp, sensor->thres_temp);

- dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n", - sensor->thres_temp); + thermal_zone_device_update(data->sensors.tzd, + THERMAL_EVENT_UNSPECIFIED);

- thermal_zone_device_update(data->sensors.tzd, - THERMAL_EVENT_UNSPECIFIED); + } else if (temp < sensor->thres_temp) { + dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n", + temp, sensor->thres_temp); + }

return IRQ_HANDLED; } @@ -352,6 +303,40 @@ static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED); }

+static int hisi_thermal_setup(struct hisi_thermal_data *data) +{ + struct hisi_thermal_sensor *sensor; + + sensor = &data->sensors; + + /* disable module firstly */ + hisi_thermal_reset_enable(data->regs, 0); + hisi_thermal_enable(data->regs, 0); + + /* select sensor id */ + hisi_thermal_sensor_select(data->regs, sensor->id); + + /* setting the hdak time */ + hisi_thermal_hdak_set(data->regs, 0); + + /* setting lag value between current temp and the threshold */ + hisi_thermal_set_lag(data->regs, HISI_TEMP_LAG); + + /* enable for interrupt */ + hisi_thermal_alarm_set(data->regs, sensor->thres_temp); + + hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET); + + /* enable module */ + hisi_thermal_reset_enable(data->regs, 1); + hisi_thermal_enable(data->regs, 1); + + hisi_thermal_alarm_clear(data->regs, 0); + hisi_thermal_alarm_enable(data->regs, 1); + + return 0; +} + static int hisi_thermal_probe(struct platform_device *pdev) { struct hisi_thermal_data *data; @@ -394,9 +379,6 @@ static int hisi_thermal_probe(struct platform_device *pdev) return ret; }

- hisi_thermal_enable_bind_irq_sensor(data); - data->irq_enabled = true; - ret = hisi_thermal_register_sensor(pdev, data, &data->sensors, HISI_DEFAULT_SENSOR); @@ -406,10 +388,15 @@ static int hisi_thermal_probe(struct platform_device *pdev) return ret; }

- ret = devm_request_threaded_irq(&pdev->dev, data->irq, - hisi_thermal_alarm_irq, + ret = hisi_thermal_setup(data); + if (ret) { + dev_err(&pdev->dev, "Failed to setup the sensor: %d\n", ret); + return ret; + } + + ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL, hisi_thermal_alarm_irq_thread, - 0, "hisi_thermal", data); + IRQF_ONESHOT, "hisi_thermal", data); if (ret < 0) { dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); return ret; @@ -417,8 +404,6 @@ static int hisi_thermal_probe(struct platform_device *pdev)

hisi_thermal_toggle_sensor(&data->sensors, true);

- enable_irq(data->irq); - return 0; }

@@ -440,7 +425,6 @@ static int hisi_thermal_suspend(struct device *dev) struct hisi_thermal_data *data = dev_get_drvdata(dev);

hisi_thermal_disable_sensor(data); - data->irq_enabled = false;

clk_disable_unprepare(data->clk);

@@ -456,8 +440,7 @@ static int hisi_thermal_resume(struct device *dev) if (ret) return ret;

- data->irq_enabled = true; - hisi_thermal_enable_bind_irq_sensor(data); + hisi_thermal_setup(data);

return 0; }