[PATCH v3 4/4] drm/panfrost: Register to the Energy Model with devfreq device

[Lukasz Luba <lukasz.luba@arm.com>]

Add device to the Energy Model framework. It will create a dedicated
and unified data structures used i.e. in the thermal framework.
The power model used in dev_pm_opp subsystem is simplified and created
based on DT 'dynamic-power-coefficient', volatage and frequency. It is
similar to the CPU model used in Energy Aware Scheduler.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 413987038fbf..d527a5113950 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -105,6 +105,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	}
 	pfdev->devfreq.devfreq = devfreq;
 
+	dev_pm_opp_of_register_em(dev, NULL);
+
 	cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
 	if (IS_ERR(cooling))
 		DRM_DEV_INFO(dev, "Failed to register cooling device\n");
@@ -118,6 +120,7 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
 {
 	if (pfdev->devfreq.cooling)
 		devfreq_cooling_unregister(pfdev->devfreq.cooling);
+	dev_pm_opp_of_unregister_em(&pfdev->pdev->dev);
 	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
 }
 
-- 
2.17.1