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ARM: OMAP2+: clockdomain: Inroduce cpu_pm notifiers for context save/restore

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Inroduce cpu_pm notifiers for context save/restore. This will be
needed for am43xx family in case of 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 20:46:59 +05:30 committed by Tony Lindgren
parent 1096d1c10b
commit 9bcfb76b63
1 changed files with 27 additions and 0 deletions
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27
arch/arm/mach-omap2/clockdomain.c
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@ -23,6 +23,7 @@
#include <linux/limits.h>
#include <linux/err.h>
#include <linux/clk-provider.h>
#include <linux/cpu_pm.h>
#include <linux/io.h>
@ -31,6 +32,7 @@
#include "soc.h"
#include "clock.h"
#include "clockdomain.h"
#include "pm.h"
/* clkdm_list contains all registered struct clockdomains */
static LIST_HEAD(clkdm_list);
@ -39,6 +41,8 @@ static LIST_HEAD(clkdm_list);
static struct clkdm_autodep *autodeps;
static struct clkdm_ops *arch_clkdm;
void clkdm_save_context(void);
void clkdm_restore_context(void);
/* Private functions */
@ -449,6 +453,22 @@ int clkdm_register_autodeps(struct clkdm_autodep *ia)
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)
clkdm_save_context();
break;
case CPU_CLUSTER_PM_EXIT:
if (enable_off_mode)
clkdm_restore_context();
break;
}
return NOTIFY_OK;
}
/**
* clkdm_complete_init - set up the clockdomain layer
*
@ -460,6 +480,7 @@ int clkdm_register_autodeps(struct clkdm_autodep *ia)
int clkdm_complete_init(void)
{
struct clockdomain *clkdm;
static struct notifier_block nb;
if (list_empty(&clkdm_list))
return -EACCES;
@ -474,6 +495,12 @@ int clkdm_complete_init(void)
clkdm_clear_all_sleepdeps(clkdm);
}
/* Only AM43XX can lose clkdm context during rtc-ddr suspend */
if (soc_is_am43xx()) {
nb.notifier_call = cpu_notifier;
cpu_pm_register_notifier(&nb);
}
return 0;
}