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path: root/drivers/thermal/imx_thermal.c
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Diffstat (limited to 'drivers/thermal/imx_thermal.c')
-rw-r--r--drivers/thermal/imx_thermal.c145
1 files changed, 91 insertions, 54 deletions
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index 2c7473d86a59..16663373b682 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -15,6 +15,7 @@
#include <linux/regmap.h>
#include <linux/thermal.h>
#include <linux/nvmem-consumer.h>
+#include <linux/pm_runtime.h>
#define REG_SET 0x4
#define REG_CLR 0x8
@@ -194,6 +195,7 @@ static struct thermal_soc_data thermal_imx7d_data = {
};
struct imx_thermal_data {
+ struct device *dev;
struct cpufreq_policy *policy;
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev;
@@ -252,44 +254,15 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
const struct thermal_soc_data *soc_data = data->socdata;
struct regmap *map = data->tempmon;
unsigned int n_meas;
- bool wait, run_measurement;
u32 val;
+ int ret;
- run_measurement = !data->irq_enabled;
- if (!run_measurement) {
- /* Check if a measurement is currently in progress */
- regmap_read(map, soc_data->temp_data, &val);
- wait = !(val & soc_data->temp_valid_mask);
- } else {
- /*
- * Every time we measure the temperature, we will power on the
- * temperature sensor, enable measurements, take a reading,
- * disable measurements, power off the temperature sensor.
- */
- regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
- soc_data->power_down_mask);
- regmap_write(map, soc_data->sensor_ctrl + REG_SET,
- soc_data->measure_temp_mask);
-
- wait = true;
- }
-
- /*
- * According to the temp sensor designers, it may require up to ~17us
- * to complete a measurement.
- */
- if (wait)
- usleep_range(20, 50);
+ ret = pm_runtime_resume_and_get(data->dev);
+ if (ret < 0)
+ return ret;
regmap_read(map, soc_data->temp_data, &val);
- if (run_measurement) {
- regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
- soc_data->measure_temp_mask);
- regmap_write(map, soc_data->sensor_ctrl + REG_SET,
- soc_data->power_down_mask);
- }
-
if ((val & soc_data->temp_valid_mask) == 0) {
dev_dbg(&tz->device, "temp measurement never finished\n");
return -EAGAIN;
@@ -328,6 +301,8 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
enable_irq(data->irq);
}
+ pm_runtime_put(data->dev);
+
return 0;
}
@@ -335,24 +310,16 @@ static int imx_change_mode(struct thermal_zone_device *tz,
enum thermal_device_mode mode)
{
struct imx_thermal_data *data = tz->devdata;
- struct regmap *map = data->tempmon;
- const struct thermal_soc_data *soc_data = data->socdata;
if (mode == THERMAL_DEVICE_ENABLED) {
- regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
- soc_data->power_down_mask);
- regmap_write(map, soc_data->sensor_ctrl + REG_SET,
- soc_data->measure_temp_mask);
+ pm_runtime_get(data->dev);
if (!data->irq_enabled) {
data->irq_enabled = true;
enable_irq(data->irq);
}
} else {
- regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
- soc_data->measure_temp_mask);
- regmap_write(map, soc_data->sensor_ctrl + REG_SET,
- soc_data->power_down_mask);
+ pm_runtime_put(data->dev);
if (data->irq_enabled) {
disable_irq(data->irq);
@@ -393,6 +360,11 @@ static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
int temp)
{
struct imx_thermal_data *data = tz->devdata;
+ int ret;
+
+ ret = pm_runtime_resume_and_get(data->dev);
+ if (ret < 0)
+ return ret;
/* do not allow changing critical threshold */
if (trip == IMX_TRIP_CRITICAL)
@@ -406,6 +378,8 @@ static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
imx_set_alarm_temp(data, temp);
+ pm_runtime_put(data->dev);
+
return 0;
}
@@ -681,6 +655,8 @@ static int imx_thermal_probe(struct platform_device *pdev)
if (!data)
return -ENOMEM;
+ data->dev = &pdev->dev;
+
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
if (IS_ERR(map)) {
ret = PTR_ERR(map);
@@ -800,6 +776,16 @@ static int imx_thermal_probe(struct platform_device *pdev)
data->socdata->power_down_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->measure_temp_mask);
+ /* After power up, we need a delay before first access can be done. */
+ usleep_range(20, 50);
+
+ /* the core was configured and enabled just before */
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(data->dev);
+
+ ret = pm_runtime_resume_and_get(data->dev);
+ if (ret < 0)
+ goto disable_runtime_pm;
data->irq_enabled = true;
ret = thermal_zone_device_enable(data->tz);
@@ -814,10 +800,15 @@ static int imx_thermal_probe(struct platform_device *pdev)
goto thermal_zone_unregister;
}
+ pm_runtime_put(data->dev);
+
return 0;
thermal_zone_unregister:
thermal_zone_device_unregister(data->tz);
+disable_runtime_pm:
+ pm_runtime_put_noidle(data->dev);
+ pm_runtime_disable(data->dev);
clk_disable:
clk_disable_unprepare(data->thermal_clk);
legacy_cleanup:
@@ -829,13 +820,9 @@ legacy_cleanup:
static int imx_thermal_remove(struct platform_device *pdev)
{
struct imx_thermal_data *data = platform_get_drvdata(pdev);
- struct regmap *map = data->tempmon;
- /* Disable measurements */
- regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
- data->socdata->power_down_mask);
- if (!IS_ERR(data->thermal_clk))
- clk_disable_unprepare(data->thermal_clk);
+ pm_runtime_put_noidle(data->dev);
+ pm_runtime_disable(data->dev);
thermal_zone_device_unregister(data->tz);
imx_thermal_unregister_legacy_cooling(data);
@@ -858,29 +845,79 @@ static int __maybe_unused imx_thermal_suspend(struct device *dev)
ret = thermal_zone_device_disable(data->tz);
if (ret)
return ret;
+
+ return pm_runtime_force_suspend(data->dev);
+}
+
+static int __maybe_unused imx_thermal_resume(struct device *dev)
+{
+ struct imx_thermal_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ ret = pm_runtime_force_resume(data->dev);
+ if (ret)
+ return ret;
+ /* Enabled thermal sensor after resume */
+ return thermal_zone_device_enable(data->tz);
+}
+
+static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
+{
+ struct imx_thermal_data *data = dev_get_drvdata(dev);
+ const struct thermal_soc_data *socdata = data->socdata;
+ struct regmap *map = data->tempmon;
+ int ret;
+
+ ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
+ socdata->measure_temp_mask);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
+ socdata->power_down_mask);
+ if (ret)
+ return ret;
+
clk_disable_unprepare(data->thermal_clk);
return 0;
}
-static int __maybe_unused imx_thermal_resume(struct device *dev)
+static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
{
struct imx_thermal_data *data = dev_get_drvdata(dev);
+ const struct thermal_soc_data *socdata = data->socdata;
+ struct regmap *map = data->tempmon;
int ret;
ret = clk_prepare_enable(data->thermal_clk);
if (ret)
return ret;
- /* Enabled thermal sensor after resume */
- ret = thermal_zone_device_enable(data->tz);
+
+ ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
+ socdata->power_down_mask);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
+ socdata->measure_temp_mask);
if (ret)
return ret;
+ /*
+ * According to the temp sensor designers, it may require up to ~17us
+ * to complete a measurement.
+ */
+ usleep_range(20, 50);
+
return 0;
}
-static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
- imx_thermal_suspend, imx_thermal_resume);
+static const struct dev_pm_ops imx_thermal_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
+ SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
+ imx_thermal_runtime_resume, NULL)
+};
static struct platform_driver imx_thermal = {
.driver = {
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-24 20:06:35 +0300