Commit 0503add9 authored by Paul Walmsley's avatar Paul Walmsley
Browse files

Watchdog: omap_wdt: add fine grain runtime-pm 

The omap_wdt should only be in full active state when the
registers are being accessed. Otherwise the device can be
on lower power mode.

This patch is based on a patch created by Kalle Jokiniemi:
https://patchwork.kernel.org/patch/618231/
which is itself based on a patch created by Atal
Shargorodsky: http://lkml.org/lkml/2009/3/10/266

.

Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
Signed-off-by: default avatarKalle Jokiniemi <kalle.jokiniemi@nokia.com>
Tested-by: default avatarKalle Jokiniemi <kalle.jokiniemi@nokia.com>
Cc: Wim Van Sebroeck <wim@iguana.be>
Acked-by: default avatarWim Van Sebroeck <wim@iguana.be>
Acked-by: default avatarKevin Hilman <khilman@ti.com>
parent 0dde52a9

drivers/watchdog/omap_wdt.c

+23 −2
Original line number Diff line number Diff line
@@ -124,6 +124,8 @@ static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev) 
	u32 pre_margin = GET_WLDR_VAL(timer_margin);

	void __iomem *base = wdev->base;



	pm_runtime_get_sync(wdev->dev);



	/* just count up at 32 KHz */

	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)

		cpu_relax();
@@ -131,6 +133,8 @@ static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev) 
	__raw_writel(pre_margin, base + OMAP_WATCHDOG_LDR);

	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)

		cpu_relax();



	pm_runtime_put_sync(wdev->dev);

}



/*
@@ -160,6 +164,8 @@ static int omap_wdt_open(struct inode *inode, struct file *file) 
	omap_wdt_ping(wdev); /* trigger loading of new timeout value */

	omap_wdt_enable(wdev);



	pm_runtime_put_sync(wdev->dev);



	return nonseekable_open(inode, file);

}
@@ -171,6 +177,7 @@ static int omap_wdt_release(struct inode *inode, struct file *file) 
	 *      Shut off the timer unless NOWAYOUT is defined.

	 */

#ifndef CONFIG_WATCHDOG_NOWAYOUT

	pm_runtime_get_sync(wdev->dev);



	omap_wdt_disable(wdev);
@@ -190,9 +197,11 @@ static ssize_t omap_wdt_write(struct file *file, const char __user *data, 


	/* Refresh LOAD_TIME. */

	if (len) {

		pm_runtime_get_sync(wdev->dev);

		spin_lock(&wdt_lock);

		omap_wdt_ping(wdev);

		spin_unlock(&wdt_lock);

		pm_runtime_put_sync(wdev->dev);

	}

	return len;

}
@@ -224,15 +233,18 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd, 
			return put_user(omap_prcm_get_reset_sources(),

					(int __user *)arg);

	case WDIOC_KEEPALIVE:

		pm_runtime_get_sync(wdev->dev);

		spin_lock(&wdt_lock);

		omap_wdt_ping(wdev);

		spin_unlock(&wdt_lock);

		pm_runtime_put_sync(wdev->dev);

		return 0;

	case WDIOC_SETTIMEOUT:

		if (get_user(new_margin, (int __user *)arg))

			return -EFAULT;

		omap_wdt_adjust_timeout(new_margin);



		pm_runtime_get_sync(wdev->dev);

		spin_lock(&wdt_lock);

		omap_wdt_disable(wdev);

		omap_wdt_set_timeout(wdev);
@@ -240,6 +252,7 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd, 


		omap_wdt_ping(wdev);

		spin_unlock(&wdt_lock);

		pm_runtime_put_sync(wdev->dev);

		/* Fall */

	case WDIOC_GETTIMEOUT:

		return put_user(timer_margin, (int __user *)arg);
@@ -345,8 +358,11 @@ static void omap_wdt_shutdown(struct platform_device *pdev) 
{

	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);



	if (wdev->omap_wdt_users)

	if (wdev->omap_wdt_users) {

		pm_runtime_get_sync(wdev->dev);

		omap_wdt_disable(wdev);

		pm_runtime_put_sync(wdev->dev);

	}

}



static int __devexit omap_wdt_remove(struct platform_device *pdev)
@@ -381,8 +397,11 @@ static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state) 
{

	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);



	if (wdev->omap_wdt_users)

	if (wdev->omap_wdt_users) {

		pm_runtime_get_sync(wdev->dev);

		omap_wdt_disable(wdev);

		pm_runtime_put_sync(wdev->dev);

	}



	return 0;

}
@@ -392,8 +411,10 @@ static int omap_wdt_resume(struct platform_device *pdev) 
	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);



	if (wdev->omap_wdt_users) {

		pm_runtime_get_sync(wdev->dev);

		omap_wdt_enable(wdev);

		omap_wdt_ping(wdev);

		pm_runtime_put_sync(wdev->dev);

	}



	return 0;

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