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: Francesco Virlinzi <francesco.virlinzi@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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1 changed files with 64 additions and 0 deletions
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@ -20,6 +20,8 @@
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#include <linux/mutex.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/list.h>
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#include <linux/kref.h>
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#include <linux/kref.h>
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#include <linux/kobject.h>
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#include <linux/sysdev.h>
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#include <linux/seq_file.h>
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#include <linux/seq_file.h>
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#include <linux/err.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/platform_device.h>
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@ -358,6 +360,68 @@ static int show_clocks(char *buf, char **start, off_t off,
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return p - buf;
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return p - buf;
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}
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}
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#ifdef CONFIG_PM
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static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)
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{
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static pm_message_t prev_state;
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struct clk *clkp;
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switch (state.event) {
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case PM_EVENT_ON:
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/* Resumeing from hibernation */
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if (prev_state.event == PM_EVENT_FREEZE) {
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list_for_each_entry(clkp, &clock_list, node)
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if (likely(clkp->ops)) {
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if (likely(clkp->ops->set_parent))
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clkp->ops->set_parent(clkp,
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clkp->parent);
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if (likely(clkp->ops->set_rate))
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clkp->ops->set_rate(clkp,
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clkp->rate, NO_CHANGE);
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else if (likely(clkp->ops->recalc))
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clkp->ops->recalc(clkp);
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}
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}
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break;
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case PM_EVENT_FREEZE:
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break;
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case PM_EVENT_SUSPEND:
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break;
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}
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prev_state = state;
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return 0;
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}
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static int clks_sysdev_resume(struct sys_device *dev)
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{
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return clks_sysdev_suspend(dev, PMSG_ON);
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}
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static struct sysdev_class clks_sysdev_class = {
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.name = "clks",
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};
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static struct sysdev_driver clks_sysdev_driver = {
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.suspend = clks_sysdev_suspend,
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.resume = clks_sysdev_resume,
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};
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static struct sys_device clks_sysdev_dev = {
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.cls = &clks_sysdev_class,
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};
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static int __init clk_sysdev_init(void)
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{
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sysdev_class_register(&clks_sysdev_class);
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sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);
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sysdev_register(&clks_sysdev_dev);
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return 0;
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}
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subsys_initcall(clk_sysdev_init);
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#endif
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int __init clk_init(void)
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int __init clk_init(void)
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{
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{
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int i, ret = 0;
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int i, ret = 0;
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