summaryrefslogtreecommitdiff
path: root/drivers/thermal/devfreq_cooling.c
diff options
context:
space:
mode:
authorLukasz Luba <lukasz.luba@arm.com>2020-12-10 17:30:12 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-12-11 16:10:44 +0300
commit84e0d87c9944eb36ae6037af5cb6905f67c074c5 (patch)
tree08e3524fc59309c0ba12e95af3cb1d78ab449021 /drivers/thermal/devfreq_cooling.c
parent229794eee27fddbedd03be5f8b20375a2637ff48 (diff)
downloadlinux-84e0d87c9944eb36ae6037af5cb6905f67c074c5.tar.xz
thermal: devfreq_cooling: add new registration functions with Energy Model
The Energy Model (EM) framework supports devices such as Devfreq. Create new registration function which automatically register EM for the thermal devfreq_cooling devices. This patch prepares the code for coming changes which are going to replace old power model with the new EM. Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20201210143014.24685-4-lukasz.luba@arm.com
Diffstat (limited to 'drivers/thermal/devfreq_cooling.c')
-rw-r--r--drivers/thermal/devfreq_cooling.c54
1 files changed, 53 insertions, 1 deletions
diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c
index afcebadbad24..6cea027d89a3 100644
--- a/drivers/thermal/devfreq_cooling.c
+++ b/drivers/thermal/devfreq_cooling.c
@@ -12,6 +12,7 @@
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
+#include <linux/energy_model.h>
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/slab.h>
@@ -577,21 +578,72 @@ struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df)
EXPORT_SYMBOL_GPL(devfreq_cooling_register);
/**
+ * devfreq_cooling_em_register_power() - Register devfreq cooling device with
+ * power information and automatically register Energy Model (EM)
+ * @df: Pointer to devfreq device.
+ * @dfc_power: Pointer to devfreq_cooling_power.
+ *
+ * Register a devfreq cooling device and automatically register EM. The
+ * available OPPs must be registered for the device.
+ *
+ * If @dfc_power is provided, the cooling device is registered with the
+ * power extensions. It is using the simple Energy Model which requires
+ * "dynamic-power-coefficient" a devicetree property. To not break drivers
+ * which miss that DT property, the function won't bail out when the EM
+ * registration failed. The cooling device will be registered if everything
+ * else is OK.
+ */
+struct thermal_cooling_device *
+devfreq_cooling_em_register(struct devfreq *df,
+ struct devfreq_cooling_power *dfc_power)
+{
+ struct thermal_cooling_device *cdev;
+ struct device *dev;
+ int ret;
+
+ if (IS_ERR_OR_NULL(df))
+ return ERR_PTR(-EINVAL);
+
+ dev = df->dev.parent;
+
+ ret = dev_pm_opp_of_register_em(dev, NULL);
+ if (ret)
+ dev_dbg(dev, "Unable to register EM for devfreq cooling device (%d)\n",
+ ret);
+
+ cdev = of_devfreq_cooling_register_power(dev->of_node, df, dfc_power);
+
+ if (IS_ERR_OR_NULL(cdev))
+ em_dev_unregister_perf_domain(dev);
+
+ return cdev;
+}
+EXPORT_SYMBOL_GPL(devfreq_cooling_em_register);
+
+/**
* devfreq_cooling_unregister() - Unregister devfreq cooling device.
* @cdev: Pointer to devfreq cooling device to unregister.
+ *
+ * Unregisters devfreq cooling device and related Energy Model if it was
+ * present.
*/
void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
{
struct devfreq_cooling_device *dfc;
+ struct device *dev;
- if (!cdev)
+ if (IS_ERR_OR_NULL(cdev))
return;
dfc = cdev->devdata;
+ dev = dfc->devfreq->dev.parent;
thermal_cooling_device_unregister(dfc->cdev);
ida_simple_remove(&devfreq_ida, dfc->id);
dev_pm_qos_remove_request(&dfc->req_max_freq);
+
+ em_dev_unregister_perf_domain(dev);
+
kfree(dfc->power_table);
kfree(dfc->freq_table);