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-rw-r--r--drivers/base/power/domain_governor.c53
-rw-r--r--drivers/base/power/qos.c2
-rw-r--r--drivers/base/power/runtime.c2
-rw-r--r--drivers/base/power/sysfs.c25
4 files changed, 29 insertions, 53 deletions
diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index 51751cc8c9e6..281f949c5ffe 100644
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -14,20 +14,23 @@
static int dev_update_qos_constraint(struct device *dev, void *data)
{
s64 *constraint_ns_p = data;
- s64 constraint_ns = -1;
+ s32 constraint_ns = -1;
if (dev->power.subsys_data && dev->power.subsys_data->domain_data)
constraint_ns = dev_gpd_data(dev)->td.effective_constraint_ns;
- if (constraint_ns < 0)
+ if (constraint_ns < 0) {
constraint_ns = dev_pm_qos_read_value(dev);
-
- if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ constraint_ns *= NSEC_PER_USEC;
+ }
+ if (constraint_ns == 0)
return 0;
- constraint_ns *= NSEC_PER_USEC;
-
- if (constraint_ns < *constraint_ns_p || *constraint_ns_p < 0)
+ /*
+ * constraint_ns cannot be negative here, because the device has been
+ * suspended.
+ */
+ if (constraint_ns < *constraint_ns_p || *constraint_ns_p == 0)
*constraint_ns_p = constraint_ns;
return 0;
@@ -60,14 +63,10 @@ static bool default_suspend_ok(struct device *dev)
spin_unlock_irqrestore(&dev->power.lock, flags);
- if (constraint_ns == 0)
+ if (constraint_ns < 0)
return false;
- if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
- constraint_ns = -1;
- else
- constraint_ns *= NSEC_PER_USEC;
-
+ constraint_ns *= NSEC_PER_USEC;
/*
* We can walk the children without any additional locking, because
* they all have been suspended at this point and their
@@ -77,19 +76,14 @@ static bool default_suspend_ok(struct device *dev)
device_for_each_child(dev, &constraint_ns,
dev_update_qos_constraint);
- if (constraint_ns < 0) {
- /* The children have no constraints. */
- td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
- td->cached_suspend_ok = true;
- } else {
- constraint_ns -= td->suspend_latency_ns + td->resume_latency_ns;
- if (constraint_ns > 0) {
- td->effective_constraint_ns = constraint_ns;
- td->cached_suspend_ok = true;
- } else {
- td->effective_constraint_ns = 0;
- }
+ if (constraint_ns > 0) {
+ constraint_ns -= td->suspend_latency_ns +
+ td->resume_latency_ns;
+ if (constraint_ns == 0)
+ return false;
}
+ td->effective_constraint_ns = constraint_ns;
+ td->cached_suspend_ok = constraint_ns >= 0;
/*
* The children have been suspended already, so we don't need to take
@@ -151,14 +145,13 @@ static bool __default_power_down_ok(struct dev_pm_domain *pd,
td = &to_gpd_data(pdd)->td;
constraint_ns = td->effective_constraint_ns;
/* default_suspend_ok() need not be called before us. */
- if (constraint_ns < 0)
+ if (constraint_ns < 0) {
constraint_ns = dev_pm_qos_read_value(pdd->dev);
-
- if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ constraint_ns *= NSEC_PER_USEC;
+ }
+ if (constraint_ns == 0)
continue;
- constraint_ns *= NSEC_PER_USEC;
-
/*
* constraint_ns cannot be negative here, because the device has
* been suspended.
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index 7d29286d9313..277d43a83f53 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -189,7 +189,7 @@ static int dev_pm_qos_constraints_allocate(struct device *dev)
plist_head_init(&c->list);
c->target_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
- c->no_constraint_value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
+ c->no_constraint_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->type = PM_QOS_MIN;
c->notifiers = n;
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 13e015905543..7bcf80fa9ada 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -253,7 +253,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
|| (dev->power.request_pending
&& dev->power.request == RPM_REQ_RESUME))
retval = -EAGAIN;
- else if (__dev_pm_qos_read_value(dev) == 0)
+ else if (__dev_pm_qos_read_value(dev) < 0)
retval = -EPERM;
else if (dev->power.runtime_status == RPM_SUSPENDED)
retval = 1;
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 632077f05c57..156ab57bca77 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -218,14 +218,7 @@ static ssize_t pm_qos_resume_latency_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- s32 value = dev_pm_qos_requested_resume_latency(dev);
-
- if (value == 0)
- return sprintf(buf, "n/a\n");
- else if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
- value = 0;
-
- return sprintf(buf, "%d\n", value);
+ return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
}
static ssize_t pm_qos_resume_latency_store(struct device *dev,
@@ -235,21 +228,11 @@ static ssize_t pm_qos_resume_latency_store(struct device *dev,
s32 value;
int ret;
- if (!kstrtos32(buf, 0, &value)) {
- /*
- * Prevent users from writing negative or "no constraint" values
- * directly.
- */
- if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
- return -EINVAL;
+ if (kstrtos32(buf, 0, &value))
+ return -EINVAL;
- if (value == 0)
- value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
- } else if (!strcmp(buf, "n/a") || !strcmp(buf, "n/a\n")) {
- value = 0;
- } else {
+ if (value < 0)
return -EINVAL;
- }
ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
value);