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authorRafael J. Wysocki <rjw@sisk.pl>2012-04-30 00:54:36 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2012-05-01 23:28:38 +0400
commit76e267d822f2913893ad210ba431607aa8e2af94 (patch)
treece3a821135a398748063f29cb064147d27b40a47 /drivers/base
parentdd8683e97f12609fb3f8c4318628f0d246542f89 (diff)
downloadlinux-76e267d822f2913893ad210ba431607aa8e2af94.tar.xz
PM / Runtime: Remove device fields related to suspend time, v2
After the previous changes in default_stop_ok() and default_power_down_ok() for PM domains, there are two fields in struct dev_pm_info that aren't necessary any more, suspend_time and max_time_suspended_ns. Remove those fields along with all of the code that accesses them, which simplifies the runtime PM framework quite a bit. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c13
-rw-r--r--drivers/base/power/runtime.c103
2 files changed, 2 insertions, 114 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index d03a8c7ad847..45c2b7f0fe3b 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -445,16 +445,6 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
genpd->status = GPD_STATE_POWER_OFF;
- /* Update PM QoS information for devices in the domain. */
- list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) {
- struct gpd_timing_data *td = &to_gpd_data(pdd)->td;
-
- pm_runtime_update_max_time_suspended(pdd->dev,
- td->start_latency_ns +
- td->restore_state_latency_ns +
- genpd->power_on_latency_ns);
- }
-
list_for_each_entry(link, &genpd->slave_links, slave_node) {
genpd_sd_counter_dec(link->master);
genpd_queue_power_off_work(link->master);
@@ -515,9 +505,6 @@ static int pm_genpd_runtime_suspend(struct device *dev)
if (ret)
return ret;
- pm_runtime_update_max_time_suspended(dev,
- dev_gpd_data(dev)->td.start_latency_ns);
-
/*
* If power.irq_safe is set, this routine will be run with interrupts
* off, so it can't use mutexes.
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index bd0f3949bcf9..59894873a3b3 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -282,47 +282,6 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
return retval != -EACCES ? retval : -EIO;
}
-struct rpm_qos_data {
- ktime_t time_now;
- s64 constraint_ns;
-};
-
-/**
- * rpm_update_qos_constraint - Update a given PM QoS constraint data.
- * @dev: Device whose timing data to use.
- * @data: PM QoS constraint data to update.
- *
- * Use the suspend timing data of @dev to update PM QoS constraint data pointed
- * to by @data.
- */
-static int rpm_update_qos_constraint(struct device *dev, void *data)
-{
- struct rpm_qos_data *qos = data;
- unsigned long flags;
- s64 delta_ns;
- int ret = 0;
-
- spin_lock_irqsave(&dev->power.lock, flags);
-
- if (dev->power.max_time_suspended_ns < 0)
- goto out;
-
- delta_ns = dev->power.max_time_suspended_ns -
- ktime_to_ns(ktime_sub(qos->time_now, dev->power.suspend_time));
- if (delta_ns <= 0) {
- ret = -EBUSY;
- goto out;
- }
-
- if (qos->constraint_ns > delta_ns || qos->constraint_ns == 0)
- qos->constraint_ns = delta_ns;
-
- out:
- spin_unlock_irqrestore(&dev->power.lock, flags);
-
- return ret;
-}
-
/**
* rpm_suspend - Carry out runtime suspend of given device.
* @dev: Device to suspend.
@@ -349,7 +308,6 @@ static int rpm_suspend(struct device *dev, int rpmflags)
{
int (*callback)(struct device *);
struct device *parent = NULL;
- struct rpm_qos_data qos;
int retval;
trace_rpm_suspend(dev, rpmflags);
@@ -445,38 +403,14 @@ static int rpm_suspend(struct device *dev, int rpmflags)
goto out;
}
- qos.constraint_ns = __dev_pm_qos_read_value(dev);
- if (qos.constraint_ns < 0) {
- /* Negative constraint means "never suspend". */
+ if (__dev_pm_qos_read_value(dev) < 0) {
+ /* Negative PM QoS constraint means "never suspend". */
retval = -EPERM;
goto out;
}
- qos.constraint_ns *= NSEC_PER_USEC;
- qos.time_now = ktime_get();
__update_runtime_status(dev, RPM_SUSPENDING);
- if (!dev->power.ignore_children) {
- if (dev->power.irq_safe)
- spin_unlock(&dev->power.lock);
- else
- spin_unlock_irq(&dev->power.lock);
-
- retval = device_for_each_child(dev, &qos,
- rpm_update_qos_constraint);
-
- if (dev->power.irq_safe)
- spin_lock(&dev->power.lock);
- else
- spin_lock_irq(&dev->power.lock);
-
- if (retval)
- goto fail;
- }
-
- dev->power.suspend_time = qos.time_now;
- dev->power.max_time_suspended_ns = qos.constraint_ns ? : -1;
-
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_suspend;
else if (dev->type && dev->type->pm)
@@ -529,8 +463,6 @@ static int rpm_suspend(struct device *dev, int rpmflags)
fail:
__update_runtime_status(dev, RPM_ACTIVE);
- dev->power.suspend_time = ktime_set(0, 0);
- dev->power.max_time_suspended_ns = -1;
dev->power.deferred_resume = false;
wake_up_all(&dev->power.wait_queue);
@@ -704,9 +636,6 @@ static int rpm_resume(struct device *dev, int rpmflags)
if (dev->power.no_callbacks)
goto no_callback; /* Assume success. */
- dev->power.suspend_time = ktime_set(0, 0);
- dev->power.max_time_suspended_ns = -1;
-
__update_runtime_status(dev, RPM_RESUMING);
if (dev->pm_domain)
@@ -1369,9 +1298,6 @@ void pm_runtime_init(struct device *dev)
setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn,
(unsigned long)dev);
- dev->power.suspend_time = ktime_set(0, 0);
- dev->power.max_time_suspended_ns = -1;
-
init_waitqueue_head(&dev->power.wait_queue);
}
@@ -1389,28 +1315,3 @@ void pm_runtime_remove(struct device *dev)
if (dev->power.irq_safe && dev->parent)
pm_runtime_put_sync(dev->parent);
}
-
-/**
- * pm_runtime_update_max_time_suspended - Update device's suspend time data.
- * @dev: Device to handle.
- * @delta_ns: Value to subtract from the device's max_time_suspended_ns field.
- *
- * Update the device's power.max_time_suspended_ns field by subtracting
- * @delta_ns from it. The resulting value of power.max_time_suspended_ns is
- * never negative.
- */
-void pm_runtime_update_max_time_suspended(struct device *dev, s64 delta_ns)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&dev->power.lock, flags);
-
- if (delta_ns > 0 && dev->power.max_time_suspended_ns > 0) {
- if (dev->power.max_time_suspended_ns > delta_ns)
- dev->power.max_time_suspended_ns -= delta_ns;
- else
- dev->power.max_time_suspended_ns = 0;
- }
-
- spin_unlock_irqrestore(&dev->power.lock, flags);
-}