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Commit 4a6dfa48 authored by Keerthy's avatar Keerthy Committed by Tony Lindgren
Browse files

ARM: OMAP2+: powerdomain: Introduce cpu_pm notifiers for context save/restore 



Inroduce cpu_pm notifiers for context save/restore. This is
needed for am43xx family during rtc only mode with ddr in
self-refresh.

Signed-off-by: default avatarKeerthy <j-keerthy@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 485995b0

arch/arm/mach-omap2/powerdomain.c

+27 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
 */

#undef DEBUG



#include <linux/cpu_pm.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/list.h>
@@ -39,6 +40,9 @@ 


#define PWRDM_TRACE_STATES_FLAG	(1<<31)



void pwrdms_save_context(void);

void pwrdms_restore_context(void);



enum {

	PWRDM_STATE_NOW = 0,

	PWRDM_STATE_PREV,
@@ -333,6 +337,22 @@ int pwrdm_register_pwrdms(struct powerdomain **ps) 
	return 0;

}



static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)

{

	switch (cmd) {

	case CPU_CLUSTER_PM_ENTER:

		if (enable_off_mode)

			pwrdms_save_context();

		break;

	case CPU_CLUSTER_PM_EXIT:

		if (enable_off_mode)

			pwrdms_restore_context();

		break;

	}



	return NOTIFY_OK;

}



/**

 * pwrdm_complete_init - set up the powerdomain layer

 *
@@ -347,6 +367,7 @@ int pwrdm_register_pwrdms(struct powerdomain **ps) 
int pwrdm_complete_init(void)

{

	struct powerdomain *temp_p;

	static struct notifier_block nb;



	if (list_empty(&pwrdm_list))

		return -EACCES;
@@ -354,6 +375,12 @@ int pwrdm_complete_init(void) 
	list_for_each_entry(temp_p, &pwrdm_list, node)

		pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);



	/* Only AM43XX can lose pwrdm context during rtc-ddr suspend */

	if (soc_is_am43xx()) {

		nb.notifier_call = cpu_notifier;

		cpu_pm_register_notifier(&nb);

	}



	return 0;

}