1427736e64
pm_runtime_force_suspend() and pm_runtime_force_resume() are used as system sleep noirq suspend and resume callbacks. If the driver is active till late suspend, where runtime PM cannot run, force suspend is essential for the device. This makes sure that the device is put into low power state during system wide PM transitions to sleep states. Signed-off-by: Sameer Pujar <spujar@nvidia.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* Tegra ACONNECT Bus Driver
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*
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* Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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struct tegra_aconnect {
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struct clk *ape_clk;
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struct clk *apb2ape_clk;
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};
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static int tegra_aconnect_probe(struct platform_device *pdev)
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{
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struct tegra_aconnect *aconnect;
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if (!pdev->dev.of_node)
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return -EINVAL;
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aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
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GFP_KERNEL);
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if (!aconnect)
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return -ENOMEM;
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aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
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if (IS_ERR(aconnect->ape_clk)) {
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dev_err(&pdev->dev, "Can't retrieve ape clock\n");
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return PTR_ERR(aconnect->ape_clk);
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}
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aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
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if (IS_ERR(aconnect->apb2ape_clk)) {
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dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
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return PTR_ERR(aconnect->apb2ape_clk);
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}
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dev_set_drvdata(&pdev->dev, aconnect);
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pm_runtime_enable(&pdev->dev);
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of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
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dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
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return 0;
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}
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static int tegra_aconnect_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static int tegra_aconnect_runtime_resume(struct device *dev)
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{
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struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
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int ret;
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ret = clk_prepare_enable(aconnect->ape_clk);
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if (ret) {
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dev_err(dev, "ape clk_enable failed: %d\n", ret);
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return ret;
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}
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ret = clk_prepare_enable(aconnect->apb2ape_clk);
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if (ret) {
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clk_disable_unprepare(aconnect->ape_clk);
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dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int tegra_aconnect_runtime_suspend(struct device *dev)
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{
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struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
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clk_disable_unprepare(aconnect->ape_clk);
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clk_disable_unprepare(aconnect->apb2ape_clk);
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return 0;
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}
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static const struct dev_pm_ops tegra_aconnect_pm_ops = {
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SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
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tegra_aconnect_runtime_resume, NULL)
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SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
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pm_runtime_force_resume)
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};
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static const struct of_device_id tegra_aconnect_of_match[] = {
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{ .compatible = "nvidia,tegra210-aconnect", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
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static struct platform_driver tegra_aconnect_driver = {
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.probe = tegra_aconnect_probe,
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.remove = tegra_aconnect_remove,
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.driver = {
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.name = "tegra-aconnect",
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.of_match_table = tegra_aconnect_of_match,
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.pm = &tegra_aconnect_pm_ops,
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},
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};
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module_platform_driver(tegra_aconnect_driver);
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MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
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MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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