drm/panfrost: Register devfreq cooling device (bc1152b0) · Commits · 戴 / test

drivers/gpu/drm/panfrost/panfrost_devfreq.c

+21 −11

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/* Copyright 2019 Collabora ltd. */
		#include <linux/devfreq.h>
		#include <linux/devfreq_cooling.h>
		#include <linux/platform_device.h>
		#include <linux/pm_opp.h>
		#include <linux/clk.h>
		@@ -81,8 +82,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
		int ret;
		struct dev_pm_opp *opp;
		unsigned long cur_freq;
		struct device *dev = &pfdev->pdev->dev;
		struct devfreq *devfreq;
		struct thermal_cooling_device *cooling;

		ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
		ret = dev_pm_opp_of_add_table(dev);
		if (ret == -ENODEV) /* Optional, continue without devfreq */
		return 0;
		else if (ret)
		@@ -92,29 +96,35 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)

		cur_freq = clk_get_rate(pfdev->clock);

		opp = devfreq_recommended_opp(&pfdev->pdev->dev, &cur_freq, 0);
		opp = devfreq_recommended_opp(dev, &cur_freq, 0);
		if (IS_ERR(opp))
		return PTR_ERR(opp);

		panfrost_devfreq_profile.initial_freq = cur_freq;
		dev_pm_opp_put(opp);

		pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
		&panfrost_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
		NULL);
		if (IS_ERR(pfdev->devfreq.devfreq)) {
		DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
		ret = PTR_ERR(pfdev->devfreq.devfreq);
		pfdev->devfreq.devfreq = NULL;
		dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
		return ret;
		devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
		DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
		if (IS_ERR(devfreq)) {
		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
		dev_pm_opp_of_remove_table(dev);
		return PTR_ERR(devfreq);
		}
		pfdev->devfreq.devfreq = devfreq;

		cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
		if (IS_ERR(cooling))
		DRM_DEV_INFO(dev, "Failed to register cooling device\n");
		else
		pfdev->devfreq.cooling = cooling;

		return 0;
		}

		void panfrost_devfreq_fini(struct panfrost_device *pfdev)
		{
		if (pfdev->devfreq.cooling)
		devfreq_cooling_unregister(pfdev->devfreq.cooling);
		dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
		}

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