From 8fda5c1fab4f8df22bad43ba93a5ba83594ac256 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Thu, 2 May 2019 02:38:07 +0300 Subject: PM / devfreq: tegra: Clean up driver's probe / remove Reset hardware, disable ACTMON clock, release OPP's and handle all possible error cases correctly, maintaining the correct tear down order. Also use devm_platform_ioremap_resource() which is now available in the kernel. Reviewed-by: Chanwoo Choi Signed-off-by: Dmitry Osipenko Acked-by: Thierry Reding Signed-off-by: MyungJoo Ham --- drivers/devfreq/tegra-devfreq.c | 83 +++++++++++++++++++++++------------------ 1 file changed, 47 insertions(+), 36 deletions(-) (limited to 'drivers/devfreq') diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c index d88f81fc99de..7e9145bd3686 100644 --- a/drivers/devfreq/tegra-devfreq.c +++ b/drivers/devfreq/tegra-devfreq.c @@ -598,7 +598,6 @@ static int tegra_devfreq_probe(struct platform_device *pdev) { struct tegra_devfreq *tegra; struct tegra_devfreq_device *dev; - struct resource *res; unsigned int i; unsigned long rate; int err; @@ -607,9 +606,7 @@ static int tegra_devfreq_probe(struct platform_device *pdev) if (!tegra) return -ENOMEM; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - tegra->regs = devm_ioremap_resource(&pdev->dev, res); + tegra->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(tegra->regs)) return PTR_ERR(tegra->regs); @@ -631,11 +628,10 @@ static int tegra_devfreq_probe(struct platform_device *pdev) return PTR_ERR(tegra->emc_clock); } - tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb; - err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb); - if (err) { - dev_err(&pdev->dev, - "Failed to register rate change notifier\n"); + tegra->irq = platform_get_irq(pdev, 0); + if (tegra->irq < 0) { + err = tegra->irq; + dev_err(&pdev->dev, "Failed to get IRQ: %d\n", err); return err; } @@ -666,54 +662,69 @@ static int tegra_devfreq_probe(struct platform_device *pdev) for (rate = 0; rate <= tegra->max_freq * KHZ; rate++) { rate = clk_round_rate(tegra->emc_clock, rate); - dev_pm_opp_add(&pdev->dev, rate, 0); - } - tegra->irq = platform_get_irq(pdev, 0); - if (tegra->irq < 0) { - err = tegra->irq; - dev_err(&pdev->dev, "Failed to get IRQ: %d\n", err); - return err; + err = dev_pm_opp_add(&pdev->dev, rate, 0); + if (err) { + dev_err(&pdev->dev, "Failed to add OPP: %d\n", err); + goto remove_opps; + } } platform_set_drvdata(pdev, tegra); + tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb; + err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb); + if (err) { + dev_err(&pdev->dev, + "Failed to register rate change notifier\n"); + goto remove_opps; + } + + tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock); + tegra->devfreq = devfreq_add_device(&pdev->dev, + &tegra_devfreq_profile, + "tegra_actmon", + NULL); + if (IS_ERR(tegra->devfreq)) { + err = PTR_ERR(tegra->devfreq); + goto unreg_notifier; + } + err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL, actmon_thread_isr, IRQF_ONESHOT, "tegra-devfreq", tegra); if (err) { - dev_err(&pdev->dev, "Interrupt request failed\n"); - return err; + dev_err(&pdev->dev, "Interrupt request failed: %d\n", err); + goto remove_devfreq; } - tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock); - tegra->devfreq = devm_devfreq_add_device(&pdev->dev, - &tegra_devfreq_profile, - "tegra_actmon", - NULL); - return 0; + +remove_devfreq: + devfreq_remove_device(tegra->devfreq); + +unreg_notifier: + clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb); + +remove_opps: + dev_pm_opp_remove_all_dynamic(&pdev->dev); + + reset_control_reset(tegra->reset); + clk_disable_unprepare(tegra->clock); + + return err; } static int tegra_devfreq_remove(struct platform_device *pdev) { struct tegra_devfreq *tegra = platform_get_drvdata(pdev); - int irq = platform_get_irq(pdev, 0); - u32 val; - unsigned int i; - - for (i = 0; i < ARRAY_SIZE(actmon_device_configs); i++) { - val = device_readl(&tegra->devices[i], ACTMON_DEV_CTRL); - val &= ~ACTMON_DEV_CTRL_ENB; - device_writel(&tegra->devices[i], val, ACTMON_DEV_CTRL); - } - - actmon_write_barrier(tegra); - devm_free_irq(&pdev->dev, irq, tegra); + devfreq_remove_device(tegra->devfreq); clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb); + dev_pm_opp_remove_all_dynamic(&pdev->dev); + reset_control_reset(tegra->reset); clk_disable_unprepare(tegra->clock); return 0; -- cgit v1.2.3