Added two new files under /sys/power for controlling OPP locks. vdd1_lock and
vdd2_lock. You can write to these to select desired OPP level and it will be
locked at that level. Lock can be cleared by writing 0 to the same file.
Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxx>
---
arch/arm/mach-omap2/pm.c | 55 ++++++++++++++++++++++++++++++++++-
arch/arm/mach-omap2/pm.h | 8 ++++-
arch/arm/mach-omap2/resource34xx.c | 24 +++++++++++++--
3 files changed, 81 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 2dd1341..155bd8d 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -43,6 +43,8 @@ unsigned short clocks_off_while_idle;
unsigned short enable_off_mode;
unsigned short voltage_off_while_idle;
atomic_t sleep_block = ATOMIC_INIT(0);
+static int vdd1_locked;
+static int vdd2_locked;
static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
static ssize_t idle_store(struct kobject *k, struct kobj_attribute *,
@@ -69,6 +71,11 @@ static struct kobj_attribute vdd1_opp_attr =
static struct kobj_attribute vdd2_opp_attr =
__ATTR(vdd2_opp, 0644, vdd_opp_show, vdd_opp_store);
+static struct kobj_attribute vdd1_lock_attr =
+ __ATTR(vdd1_lock, 0644, vdd_opp_show, vdd_opp_store);
+static struct kobj_attribute vdd2_lock_attr =
+ __ATTR(vdd2_lock, 0644, vdd_opp_show, vdd_opp_store);
+
#endif
static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
@@ -127,6 +134,10 @@ static ssize_t vdd_opp_show(struct kobject *kobj, struct kobj_attribute *attr,
return sprintf(buf, "%hu\n", resource_get_level("vdd1_opp"));
else if (attr == &vdd2_opp_attr)
return sprintf(buf, "%hu\n", resource_get_level("vdd2_opp"));
+ else if (attr == &vdd1_lock_attr)
+ return sprintf(buf, "%hu\n", resource_get_opp_lock(VDD1_OPP));
+ else if (attr == &vdd2_lock_attr)
+ return sprintf(buf, "%hu\n", resource_get_opp_lock(VDD2_OPP));
else
return -EINVAL;
}
@@ -135,22 +146,50 @@ static ssize_t vdd_opp_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned short value;
+ int flags = 0;
if (sscanf(buf, "%hu", &value) != 1)
return -EINVAL;
+ /* Check locks */
+ if (attr == &vdd1_lock_attr) {
+ flags = OPP_IGNORE_LOCK;
+ attr = &vdd1_opp_attr;
+ if (vdd1_locked && value == 0) {
+ resource_unlock_opp(VDD1_OPP);
+ vdd1_locked = 0;
+ return n;
+ }
+ if (vdd1_locked == 0 && value != 0) {
+ resource_lock_opp(VDD1_OPP);
+ vdd1_locked = 1;
+ }
+ } else if (attr == &vdd2_lock_attr) {
+ flags = OPP_IGNORE_LOCK;
+ attr = &vdd2_opp_attr;
+ if (vdd2_locked && value == 0) {
+ resource_unlock_opp(VDD2_OPP);
+ vdd2_locked = 0;
+ return n;
+ }
+ if (vdd2_locked == 0 && value != 0) {
+ resource_lock_opp(VDD2_OPP);
+ vdd2_locked = 1;
+ }
+ }
+
if (attr == &vdd1_opp_attr) {
if (value < 1 || value > 5) {
printk(KERN_ERR "vdd_opp_store: Invalid value\n");
return -EINVAL;
}
- set_opp_level(VDD1_OPP, value);
+ resource_set_opp_level(VDD1_OPP, value, flags);
} else if (attr == &vdd2_opp_attr) {
if (value < 2 || value > 3) {
printk(KERN_ERR "vdd_opp_store: Invalid value\n");
return -EINVAL;
}
- set_opp_level(VDD2_OPP, value);
+ resource_set_opp_level(VDD2_OPP, value, flags);
} else {
return -EINVAL;
}
@@ -227,6 +266,18 @@ static int __init omap_pm_init(void)
printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
return error;
}
+
+ error = sysfs_create_file(power_kobj, &vdd1_lock_attr.attr);
+ if (error) {
+ printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ return error;
+ }
+
+ error = sysfs_create_file(power_kobj, &vdd2_lock_attr.attr);
+ if (error) {
+ printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ return error;
+ }
#endif
voltage_off_while_idle = 0;
/* Going to 0V on anything under ES2.1 will eventually cause a crash */
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 4c0052f..4f98c86 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -42,7 +42,13 @@ extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);
#define omap3_pm_set_suspend_state(pwrdm,state) do {} while (0);
#endif
extern int set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
-extern int set_opp_level(int res, u32 target_level);
+extern int resource_set_opp_level(int res, u32 target_level, int flags);
+extern int resource_access_opp_lock(int res, int delta);
+#define resource_lock_opp(res) resource_access_opp_lock(res, 1)
+#define resource_unlock_opp(res) resource_access_opp_lock(res, -1)
+#define resource_get_opp_lock(res) resource_access_opp_lock(res, 0)
+
+#define OPP_IGNORE_LOCK 0x1
#ifdef CONFIG_PM_DEBUG
extern void omap2_pm_dump(int mode, int resume, unsigned int us);
diff --git a/arch/arm/mach-omap2/resource34xx.c b/arch/arm/mach-omap2/resource34xx.c
index d2c4e1f..e52260d 100644
--- a/arch/arm/mach-omap2/resource34xx.c
+++ b/arch/arm/mach-omap2/resource34xx.c
@@ -139,6 +139,8 @@ static struct shared_resource *vdd1_resp;
static struct shared_resource *vdd2_resp;
static struct device dummy_mpu_dev;
static struct device dummy_dsp_dev;
+static int vdd1_lock;
+static int vdd2_lock;
/**
* init_opp - Initialize the OPP resource
@@ -165,7 +167,19 @@ void init_opp(struct shared_resource *resp)
return;
}
-int set_opp_level(int res, u32 target_level)
+int resource_access_opp_lock(int res, int delta)
+{
+ if (res == VDD1_OPP) {
+ vdd1_lock += delta;
+ return vdd1_lock;
+ } else if (res == VDD2_OPP) {
+ vdd2_lock += delta;
+ return vdd2_lock;
+ }
+ return -EINVAL;
+}
+
+int resource_set_opp_level(int res, u32 target_level, int flags)
{
unsigned long mpu_freq, mpu_old_freq, l3_freq, t_opp;
struct cpufreq_freqs freqs_notify;
@@ -185,6 +199,8 @@ int set_opp_level(int res, u32 target_level)
return 0;
if (res == VDD1_OPP) {
+ if (flags != OPP_IGNORE_LOCK && vdd1_lock)
+ return 0;
mpu_old_freq = get_freq(mpu_opps + MAX_VDD1_OPP,
curr_vdd1_prcm_set->opp_id);
mpu_freq = get_freq(mpu_opps + MAX_VDD1_OPP,
@@ -219,6 +235,8 @@ int set_opp_level(int res, u32 target_level)
cpufreq_notify_transition(&freqs_notify, CPUFREQ_POSTCHANGE);
#endif
} else {
+ if (flags != OPP_IGNORE_LOCK && vdd2_lock)
+ return 0;
l3_freq = get_freq(l3_opps + MAX_VDD2_OPP,
target_level);
t_opp = ID_VDD(PRCM_VDD2) |
@@ -250,7 +268,7 @@ int set_opp(struct shared_resource *resp, u32 target_level)
struct bus_throughput_db *tput_db;
if (resp == vdd1_resp) {
- set_opp_level(VDD1_OPP, target_level);
+ resource_set_opp_level(VDD1_OPP, target_level, 0);
} else if (resp == vdd2_resp) {
tput_db = resp->resource_data;
tput = target_level;
@@ -262,7 +280,7 @@ int set_opp(struct shared_resource *resp, u32 target_level)
/* Set the highest OPP possible */
if (ind == MAX_VDD2_OPP)
target_level = ind-1;
- set_opp_level(VDD2_OPP, target_level);
+ resource_set_opp_level(VDD2_OPP, target_level, 0);
}
return 0;
}
--
1.5.4.3
--
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