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Commit 3cb6f10a authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

sh: MTU2: Basic runtime PM support 



Modify the SH MTU2 clock event device driver to support runtime PM at
a basic level (i.e. device clocks can be disabled and enabled, but
domain power must be on, because the device has to be marked as
"irq safe").

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
parent bad81383

drivers/clocksource/sh_mtu2.c

+23 −6
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/slab.h>

#include <linux/module.h>

#include <linux/pm_domain.h>

#include <linux/pm_runtime.h>



struct sh_mtu2_priv {

	void __iomem *mapbase;
@@ -123,6 +124,9 @@ static int sh_mtu2_enable(struct sh_mtu2_priv *p) 
{

	int ret;



	pm_runtime_get_sync(&p->pdev->dev);

	dev_pm_syscore_device(&p->pdev->dev, true);



	/* enable clock */

	ret = clk_enable(p->clk);

	if (ret) {
@@ -157,6 +161,9 @@ static void sh_mtu2_disable(struct sh_mtu2_priv *p) 


	/* stop clock */

	clk_disable(p->clk);



	dev_pm_syscore_device(&p->pdev->dev, false);

	pm_runtime_put(&p->pdev->dev);

}



static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
@@ -317,18 +324,17 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev) 
static int __devinit sh_mtu2_probe(struct platform_device *pdev)

{

	struct sh_mtu2_priv *p = platform_get_drvdata(pdev);

	struct sh_timer_config *cfg = pdev->dev.platform_data;

	int ret;



	if (!is_early_platform_device(pdev)) {

		struct sh_timer_config *cfg = pdev->dev.platform_data;



		if (cfg->clockevent_rating)

			dev_pm_syscore_device(&pdev->dev, true);

		pm_runtime_set_active(&pdev->dev);

		pm_runtime_enable(&pdev->dev);

	}



	if (p) {

		dev_info(&pdev->dev, "kept as earlytimer\n");

		return 0;

		goto out;

	}



	p = kmalloc(sizeof(*p), GFP_KERNEL);
@@ -341,9 +347,20 @@ static int __devinit sh_mtu2_probe(struct platform_device *pdev) 
	if (ret) {

		kfree(p);

		platform_set_drvdata(pdev, NULL);

	}

		pm_runtime_idle(&pdev->dev);

		return ret;

	}

	if (is_early_platform_device(pdev))

		return 0;



 out:

	if (cfg->clockevent_rating)

		pm_runtime_irq_safe(&pdev->dev);

	else

		pm_runtime_idle(&pdev->dev);



	return 0;

}



static int __devexit sh_mtu2_remove(struct platform_device *pdev)

{