Commit 4a55026f authored by Francesco VIRLINZI's avatar Francesco VIRLINZI Committed by Paul Mundt
Browse files

sh: clkfwk: Add resume from hibernation support. 



This patch adds PM support to the clock framework.
With this, resume from hibernation is properly supported.

Signed-off-by: default avatarFrancesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d680c76e

arch/sh/kernel/cpu/clock.c

+64 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include <linux/mutex.h>

#include <linux/list.h>

#include <linux/kref.h>

#include <linux/kobject.h>

#include <linux/sysdev.h>

#include <linux/seq_file.h>

#include <linux/err.h>

#include <linux/platform_device.h>
@@ -358,6 +360,68 @@ static int show_clocks(char *buf, char **start, off_t off, 
	return p - buf;

}



#ifdef CONFIG_PM

static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)

{

	static pm_message_t prev_state;

	struct clk *clkp;



	switch (state.event) {

	case PM_EVENT_ON:

		/* Resumeing from hibernation */

		if (prev_state.event == PM_EVENT_FREEZE) {

			list_for_each_entry(clkp, &clock_list, node)

				if (likely(clkp->ops)) {

					if (likely(clkp->ops->set_parent))

						clkp->ops->set_parent(clkp,

							clkp->parent);

					if (likely(clkp->ops->set_rate))

						clkp->ops->set_rate(clkp,

							clkp->rate, NO_CHANGE);

					else if (likely(clkp->ops->recalc))

						clkp->ops->recalc(clkp);

					}

		}

		break;

	case PM_EVENT_FREEZE:

		break;

	case PM_EVENT_SUSPEND:

		break;

	}



	prev_state = state;

	return 0;

}



static int clks_sysdev_resume(struct sys_device *dev)

{

	return clks_sysdev_suspend(dev, PMSG_ON);

}



static struct sysdev_class clks_sysdev_class = {

	.name = "clks",

};



static struct sysdev_driver clks_sysdev_driver = {

	.suspend = clks_sysdev_suspend,

	.resume = clks_sysdev_resume,

};



static struct sys_device clks_sysdev_dev = {

	.cls = &clks_sysdev_class,

};



static int __init clk_sysdev_init(void)

{

	sysdev_class_register(&clks_sysdev_class);

	sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);

	sysdev_register(&clks_sysdev_dev);



	return 0;

}

subsys_initcall(clk_sysdev_init);

#endif



int __init clk_init(void)

{

	int i, ret = 0;