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Commit 8e6bcd9f authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / s2idle: Rearrange the main suspend-to-idle loop 



As a preparation for subsequent changes, rearrange the core
suspend-to-idle code by moving the initial invocation of
dpm_suspend_noirq() into s2idle_loop().

This also causes debug messages from that code to appear in
a less confusing order.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent cb08e035

kernel/power/power.h

+4 −0
Original line number Diff line number Diff line
@@ -245,7 +245,11 @@ enum { 
#define TEST_FIRST	TEST_NONE

#define TEST_MAX	(__TEST_AFTER_LAST - 1)



#ifdef CONFIG_PM_DEBUG

extern int pm_test_level;

#else

#define pm_test_level	(TEST_NONE)

#endif



#ifdef CONFIG_SUSPEND_FREEZER

static inline int suspend_freeze_processes(void)

kernel/power/suspend.c

+13 −13
Original line number Diff line number Diff line
@@ -108,7 +108,13 @@ static void s2idle_loop(void) 
{

	pm_pr_dbg("suspend-to-idle\n");



	do {

	while (!dpm_suspend_noirq(PMSG_SUSPEND)) {

		/*

		 * Suspend-to-idle equals

		 * frozen processes + suspended devices + idle processors.

		 * Thus freeze_enter() should be called right after

		 * all devices have been suspended.

		 */

		freeze_enter();



		if (freeze_ops && freeze_ops->wake)
@@ -122,7 +128,7 @@ static void s2idle_loop(void) 
			break;



		pm_wakeup_clear(false);

	} while (!dpm_suspend_noirq(PMSG_SUSPEND));

	}



	pm_pr_dbg("resume from suspend-to-idle\n");

}
@@ -379,6 +385,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) 
	if (error)

		goto Devices_early_resume;



	if (state == PM_SUSPEND_FREEZE && pm_test_level != TEST_PLATFORM) {

		s2idle_loop();

		goto Platform_early_resume;

	}



	error = dpm_suspend_noirq(PMSG_SUSPEND);

	if (error) {

		pr_err("PM: noirq suspend of devices failed\n");
@@ -391,17 +402,6 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) 
	if (suspend_test(TEST_PLATFORM))

		goto Platform_wake;



	/*

	 * PM_SUSPEND_FREEZE equals

	 * frozen processes + suspended devices + idle processors.

	 * Thus we should invoke freeze_enter() soon after

	 * all the devices are suspended.

	 */

	if (state == PM_SUSPEND_FREEZE) {

		s2idle_loop();

		goto Platform_early_resume;

	}



	error = disable_nonboot_cpus();

	if (error || suspend_test(TEST_CPUS))

		goto Enable_cpus;