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cpufreq_cooling_register() expects mask of all the CPUs where frequency constraint is applicable. This platform has more than one CPU to which these constraints will apply and so passing mask of only CPU0 wouldn't be sufficient. Also, this platform has a single cluster of CPUs and the constraint applies to all CPUs. If CPU0 is hoplugged out then we may face strange BUGs as cpu_cooling framework isn't aware of any siblings sharing clock line. Fix it by passing cpu_present_mask to cpufreq_cooling_register(). Cc: Hongbo Zhang <hongbo.zhang@linaro.com> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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* db8500_cpufreq_cooling.c - DB8500 cpufreq works as cooling device.
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*
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* Copyright (C) 2012 ST-Ericsson
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* Copyright (C) 2012 Linaro Ltd.
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*
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* Author: Hongbo Zhang <hongbo.zhang@linaro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/cpu_cooling.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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static int db8500_cpufreq_cooling_probe(struct platform_device *pdev)
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{
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struct thermal_cooling_device *cdev;
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cdev = cpufreq_cooling_register(cpu_present_mask);
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if (IS_ERR(cdev)) {
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dev_err(&pdev->dev, "Failed to register cooling device\n");
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return PTR_ERR(cdev);
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}
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platform_set_drvdata(pdev, cdev);
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dev_info(&pdev->dev, "Cooling device registered: %s\n", cdev->type);
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return 0;
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}
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static int db8500_cpufreq_cooling_remove(struct platform_device *pdev)
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{
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struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
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cpufreq_cooling_unregister(cdev);
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return 0;
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}
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static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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return -ENOSYS;
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}
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static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
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{
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return -ENOSYS;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id db8500_cpufreq_cooling_match[] = {
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{ .compatible = "stericsson,db8500-cpufreq-cooling" },
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{},
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};
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#endif
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static struct platform_driver db8500_cpufreq_cooling_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "db8500-cpufreq-cooling",
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.of_match_table = of_match_ptr(db8500_cpufreq_cooling_match),
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},
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.probe = db8500_cpufreq_cooling_probe,
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.suspend = db8500_cpufreq_cooling_suspend,
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.resume = db8500_cpufreq_cooling_resume,
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.remove = db8500_cpufreq_cooling_remove,
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};
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static int __init db8500_cpufreq_cooling_init(void)
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{
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return platform_driver_register(&db8500_cpufreq_cooling_driver);
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}
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static void __exit db8500_cpufreq_cooling_exit(void)
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{
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platform_driver_unregister(&db8500_cpufreq_cooling_driver);
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}
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/* Should be later than db8500_cpufreq_register */
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late_initcall(db8500_cpufreq_cooling_init);
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module_exit(db8500_cpufreq_cooling_exit);
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MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
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MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
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MODULE_LICENSE("GPL");
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