Commit 7514dd05 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by MyungJoo Ham
Browse files

PM / devfreq: tegra: Properly disable interrupts 



There is no guarantee that interrupt handling isn't running in parallel
with tegra_actmon_disable_interrupts(), hence it is necessary to protect
DEV_CTRL register accesses and clear IRQ status with ACTMON's IRQ being
disabled in the Interrupt Controller in order to ensure that device
interrupt is indeed being disabled.

Reviewed-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
parent dd3f2616

drivers/devfreq/tegra-devfreq.c

+15 −6
Original line number Diff line number Diff line
@@ -159,6 +159,8 @@ struct tegra_devfreq { 
	struct notifier_block	rate_change_nb;



	struct tegra_devfreq_device devices[ARRAY_SIZE(actmon_device_configs)];



	int irq;

};



struct tegra_actmon_emc_ratio {
@@ -405,6 +407,8 @@ static void tegra_actmon_disable_interrupts(struct tegra_devfreq *tegra) 
	u32 val;

	unsigned int i;



	disable_irq(tegra->irq);



	for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {

		dev = &tegra->devices[i];
@@ -415,9 +419,14 @@ static void tegra_actmon_disable_interrupts(struct tegra_devfreq *tegra) 
		val &= ~ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;



		device_writel(dev, val, ACTMON_DEV_CTRL);



		device_writel(dev, ACTMON_INTR_STATUS_CLEAR,

			      ACTMON_DEV_INTR_STATUS);

	}



	actmon_write_barrier(tegra);



	enable_irq(tegra->irq);

}



static void tegra_actmon_configure_device(struct tegra_devfreq *tegra,
@@ -592,7 +601,6 @@ static int tegra_devfreq_probe(struct platform_device *pdev) 
	struct resource *res;

	unsigned int i;

	unsigned long rate;

	int irq;

	int err;



	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
@@ -661,15 +669,16 @@ static int tegra_devfreq_probe(struct platform_device *pdev) 
		dev_pm_opp_add(&pdev->dev, rate, 0);

	}



	irq = platform_get_irq(pdev, 0);

	if (irq < 0) {

		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);

		return irq;

	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;

	}



	platform_set_drvdata(pdev, tegra);



	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,

	err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,

					actmon_thread_isr, IRQF_ONESHOT,

					"tegra-devfreq", tegra);

	if (err) {

CRA Git | Maintained and supported by SUSTech CRA and CCSE