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PM / Domains: Move genpd_power_off() above genpd_power_on()

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Following changes in genpd_power_on() makes it invoke genpd_power_off().
To enable these changes and avoiding to declare genpd_power_off(), let's
move its implementation above genpd_power_on(). In this way, following
changes should become easier to review.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2017-02-17 10:55:23 +01:00 committed by Rafael J. Wysocki
parent 16d0bf1882
commit 1f8728b7ad
1 changed files with 81 additions and 81 deletions
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162
drivers/base/power/domain.c
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@ -273,6 +273,87 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
queue_work(pm_wq, &genpd->power_off_work);
}
/**
* genpd_power_off - Remove power from a given PM domain.
* @genpd: PM domain to power down.
* @is_async: PM domain is powered down from a scheduled work
*
* If all of the @genpd's devices have been suspended and all of its subdomains
* have been powered down, remove power from @genpd.
*/
static int genpd_power_off(struct generic_pm_domain *genpd, bool is_async)
{
struct pm_domain_data *pdd;
struct gpd_link *link;
unsigned int not_suspended = 0;
/*
* Do not try to power off the domain in the following situations:
* (1) The domain is already in the "power off" state.
* (2) System suspend is in progress.
*/
if (genpd->status == GPD_STATE_POWER_OFF
|| genpd->prepared_count > 0)
return 0;
if (atomic_read(&genpd->sd_count) > 0)
return -EBUSY;
list_for_each_entry(pdd, &genpd->dev_list, list_node) {
enum pm_qos_flags_status stat;
stat = dev_pm_qos_flags(pdd->dev,
PM_QOS_FLAG_NO_POWER_OFF
| PM_QOS_FLAG_REMOTE_WAKEUP);
if (stat > PM_QOS_FLAGS_NONE)
return -EBUSY;
/*
* Do not allow PM domain to be powered off, when an IRQ safe
* device is part of a non-IRQ safe domain.
*/
if (!pm_runtime_suspended(pdd->dev) ||
irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
not_suspended++;
}
if (not_suspended > 1 || (not_suspended == 1 && is_async))
return -EBUSY;
if (genpd->gov && genpd->gov->power_down_ok) {
if (!genpd->gov->power_down_ok(&genpd->domain))
return -EAGAIN;
}
if (genpd->power_off) {
int ret;
if (atomic_read(&genpd->sd_count) > 0)
return -EBUSY;
/*
* If sd_count > 0 at this point, one of the subdomains hasn't
* managed to call genpd_power_on() for the master yet after
* incrementing it. In that case genpd_power_on() will wait
* for us to drop the lock, so we can call .power_off() and let
* the genpd_power_on() restore power for us (this shouldn't
* happen very often).
*/
ret = _genpd_power_off(genpd, true);
if (ret)
return ret;
}
genpd->status = GPD_STATE_POWER_OFF;
list_for_each_entry(link, &genpd->slave_links, slave_node) {
genpd_sd_counter_dec(link->master);
genpd_queue_power_off_work(link->master);
}
return 0;
}
/**
* genpd_power_on - Restore power to a given PM domain and its masters.
* @genpd: PM domain to power up.
@ -367,87 +448,6 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
return NOTIFY_DONE;
}
/**
* genpd_power_off - Remove power from a given PM domain.
* @genpd: PM domain to power down.
* @is_async: PM domain is powered down from a scheduled work
*
* If all of the @genpd's devices have been suspended and all of its subdomains
* have been powered down, remove power from @genpd.
*/
static int genpd_power_off(struct generic_pm_domain *genpd, bool is_async)
{
struct pm_domain_data *pdd;
struct gpd_link *link;
unsigned int not_suspended = 0;
/*
* Do not try to power off the domain in the following situations:
* (1) The domain is already in the "power off" state.
* (2) System suspend is in progress.
*/
if (genpd->status == GPD_STATE_POWER_OFF
|| genpd->prepared_count > 0)
return 0;
if (atomic_read(&genpd->sd_count) > 0)
return -EBUSY;
list_for_each_entry(pdd, &genpd->dev_list, list_node) {
enum pm_qos_flags_status stat;
stat = dev_pm_qos_flags(pdd->dev,
PM_QOS_FLAG_NO_POWER_OFF
| PM_QOS_FLAG_REMOTE_WAKEUP);
if (stat > PM_QOS_FLAGS_NONE)
return -EBUSY;
/*
* Do not allow PM domain to be powered off, when an IRQ safe
* device is part of a non-IRQ safe domain.
*/
if (!pm_runtime_suspended(pdd->dev) ||
irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
not_suspended++;
}
if (not_suspended > 1 || (not_suspended == 1 && is_async))
return -EBUSY;
if (genpd->gov && genpd->gov->power_down_ok) {
if (!genpd->gov->power_down_ok(&genpd->domain))
return -EAGAIN;
}
if (genpd->power_off) {
int ret;
if (atomic_read(&genpd->sd_count) > 0)
return -EBUSY;
/*
* If sd_count > 0 at this point, one of the subdomains hasn't
* managed to call genpd_power_on() for the master yet after
* incrementing it. In that case genpd_power_on() will wait
* for us to drop the lock, so we can call .power_off() and let
* the genpd_power_on() restore power for us (this shouldn't
* happen very often).
*/
ret = _genpd_power_off(genpd, true);
if (ret)
return ret;
}
genpd->status = GPD_STATE_POWER_OFF;
list_for_each_entry(link, &genpd->slave_links, slave_node) {
genpd_sd_counter_dec(link->master);
genpd_queue_power_off_work(link->master);
}
return 0;
}
/**
* genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
* @work: Work structure used for scheduling the execution of this function.