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

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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: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Keerthy 2018-05-16 20:47:01 +05:30 committed by Tony Lindgren
parent 485995b09b
commit 4a6dfa480d
1 changed files with 27 additions and 0 deletions
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27
arch/arm/mach-omap2/powerdomain.c
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@ -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;
}