This patch adds a runtime sysfs knob (/sys/power/enable_off_mode)
to enable/disbale CORE OFF support for OMAP3.
Signed-off-by: Rajendra Nayak <[EMAIL PROTECTED]>
---
arch/arm/mach-omap2/pm.c | 21 +++++++++++++++++----
arch/arm/mach-omap2/pm.h | 2 ++
arch/arm/mach-omap2/pm34xx.c | 26 ++++++++++++++++++++++++++
3 files changed, 45 insertions(+), 4 deletions(-)
Index: linux-omap-2.6/arch/arm/mach-omap2/pm34xx.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/pm34xx.c 2008-09-26
16:39:30.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/pm34xx.c 2008-09-26 16:39:34.000000000
+0530
@@ -395,6 +395,32 @@ static int omap3_can_sleep(void)
return 1;
}
+int set_next_pwrst(struct powerdomain *pwrdm)
+{
+ struct power_state *pwrst;
+ int ret = 0;
+ u32 state;
+
+ if (!pwrdm->pwrsts)
+ return 0;
+
+ if (enable_off_mode)
+ state = PWRDM_POWER_OFF;
+ else
+ state = PWRDM_POWER_RET;
+
+ ret = pwrdm_set_next_pwrst(pwrdm, state);
+ if (ret) {
+ printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
+ pwrdm->name);
+ goto err;
+ }
+ list_for_each_entry(pwrst, &pwrst_list, node)
+ pwrst->next_state = state;
+err:
+ return ret;
+}
+
/* This sets pwrdm state (other than mpu & core. Currently only ON &
* RET are supported. Function is assuming that clkdm doesn't have
* hw_sup mode enabled. */
Index: linux-omap-2.6/arch/arm/mach-omap2/pm.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/pm.c 2008-09-26
16:39:30.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/pm.c 2008-09-26 16:39:34.000000000
+0530
@@ -35,6 +35,7 @@
unsigned short enable_dyn_sleep;
unsigned short clocks_off_while_idle;
+unsigned short enable_off_mode;
atomic_t sleep_block = ATOMIC_INIT(0);
static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
@@ -47,6 +48,9 @@ static struct kobj_attribute sleep_while
static struct kobj_attribute clocks_off_while_idle_attr =
__ATTR(clocks_off_while_idle, 0644, idle_show, idle_store);
+static struct kobj_attribute enable_off_mode_attr =
+ __ATTR(enable_off_mode, 0644, idle_show, idle_store);
+
static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
@@ -54,6 +58,8 @@ static ssize_t idle_show(struct kobject
return sprintf(buf, "%hu\n", enable_dyn_sleep);
else if (attr == &clocks_off_while_idle_attr)
return sprintf(buf, "%hu\n", clocks_off_while_idle);
+ else if (attr == &enable_off_mode_attr)
+ return sprintf(buf, "%hu\n", enable_off_mode);
else
return -EINVAL;
}
@@ -69,13 +75,16 @@ static ssize_t idle_store(struct kobject
return -EINVAL;
}
- if (attr == &sleep_while_idle_attr)
+ if (attr == &sleep_while_idle_attr) {
enable_dyn_sleep = value;
- else if (attr == &clocks_off_while_idle_attr)
+ } else if (attr == &clocks_off_while_idle_attr) {
clocks_off_while_idle = value;
- else
+ } else if (attr == &enable_off_mode_attr) {
+ enable_off_mode = value;
+ pwrdm_for_each(set_next_pwrst);
+ } else {
return -EINVAL;
-
+ }
return n;
}
@@ -114,6 +123,10 @@ static int __init omap_pm_init(void)
&clocks_off_while_idle_attr.attr);
if (error)
printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ error = sysfs_create_file(power_kobj,
+ &enable_off_mode_attr.attr);
+ if (error)
+ printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
return error;
}
Index: linux-omap-2.6/arch/arm/mach-omap2/pm.h
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/pm.h 2008-09-26
16:39:30.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/pm.h 2008-09-26 16:39:34.000000000
+0530
@@ -18,10 +18,12 @@ extern int omap3_pm_init(void);
extern unsigned short enable_dyn_sleep;
extern unsigned short clocks_off_while_idle;
+extern unsigned short enable_off_mode;
extern atomic_t sleep_block;
extern void omap2_block_sleep(void);
extern void omap2_allow_sleep(void);
+extern int set_next_pwrst(struct powerdomain *pwrdm);
#define OMAP343X_TABLE_ADDRESS_OFFSET 0x31
#define OMAP343X_TABLE_VALUE_OFFSET 0x30
--
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