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Diffstat (limited to 'drivers/base/power/main.c')
-rw-r--r--drivers/base/power/main.c87
1 files changed, 56 insertions, 31 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index aa6320207745..a85459126bc6 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -57,7 +57,8 @@ static int async_error;
*/
void device_pm_init(struct device *dev)
{
- dev->power.in_suspend = false;
+ dev->power.is_prepared = false;
+ dev->power.is_suspended = false;
init_completion(&dev->power.completion);
complete_all(&dev->power.completion);
dev->power.wakeup = NULL;
@@ -91,7 +92,7 @@ void device_pm_add(struct device *dev)
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
mutex_lock(&dpm_list_mtx);
- if (dev->parent && dev->parent->power.in_suspend)
+ if (dev->parent && dev->parent->power.is_prepared)
dev_warn(dev, "parent %s should not be sleeping\n",
dev_name(dev->parent));
list_add_tail(&dev->power.entry, &dpm_list);
@@ -424,9 +425,9 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
TRACE_DEVICE(dev);
TRACE_RESUME(0);
- if (dev->pwr_domain) {
+ if (dev->pm_domain) {
pm_dev_dbg(dev, state, "EARLY power domain ");
- error = pm_noirq_op(dev, &dev->pwr_domain->ops, state);
+ error = pm_noirq_op(dev, &dev->pm_domain->ops, state);
} else if (dev->type && dev->type->pm) {
pm_dev_dbg(dev, state, "EARLY type ");
error = pm_noirq_op(dev, dev->type->pm, state);
@@ -504,6 +505,7 @@ static int legacy_resume(struct device *dev, int (*cb)(struct device *dev))
static int device_resume(struct device *dev, pm_message_t state, bool async)
{
int error = 0;
+ bool put = false;
TRACE_DEVICE(dev);
TRACE_RESUME(0);
@@ -511,11 +513,21 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
dpm_wait(dev->parent, async);
device_lock(dev);
- dev->power.in_suspend = false;
+ /*
+ * This is a fib. But we'll allow new children to be added below
+ * a resumed device, even if the device hasn't been completed yet.
+ */
+ dev->power.is_prepared = false;
- if (dev->pwr_domain) {
+ if (!dev->power.is_suspended)
+ goto Unlock;
+
+ pm_runtime_enable(dev);
+ put = true;
+
+ if (dev->pm_domain) {
pm_dev_dbg(dev, state, "power domain ");
- error = pm_op(dev, &dev->pwr_domain->ops, state);
+ error = pm_op(dev, &dev->pm_domain->ops, state);
goto End;
}
@@ -548,10 +560,17 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
}
End:
+ dev->power.is_suspended = false;
+
+ Unlock:
device_unlock(dev);
complete_all(&dev->power.completion);
TRACE_RESUME(error);
+
+ if (put)
+ pm_runtime_put_sync(dev);
+
return error;
}
@@ -630,10 +649,10 @@ static void device_complete(struct device *dev, pm_message_t state)
{
device_lock(dev);
- if (dev->pwr_domain) {
+ if (dev->pm_domain) {
pm_dev_dbg(dev, state, "completing power domain ");
- if (dev->pwr_domain->ops.complete)
- dev->pwr_domain->ops.complete(dev);
+ if (dev->pm_domain->ops.complete)
+ dev->pm_domain->ops.complete(dev);
} else if (dev->type && dev->type->pm) {
pm_dev_dbg(dev, state, "completing type ");
if (dev->type->pm->complete)
@@ -670,7 +689,7 @@ void dpm_complete(pm_message_t state)
struct device *dev = to_device(dpm_prepared_list.prev);
get_device(dev);
- dev->power.in_suspend = false;
+ dev->power.is_prepared = false;
list_move(&dev->power.entry, &list);
mutex_unlock(&dpm_list_mtx);
@@ -733,9 +752,9 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
{
int error;
- if (dev->pwr_domain) {
+ if (dev->pm_domain) {
pm_dev_dbg(dev, state, "LATE power domain ");
- error = pm_noirq_op(dev, &dev->pwr_domain->ops, state);
+ error = pm_noirq_op(dev, &dev->pm_domain->ops, state);
if (error)
return error;
} else if (dev->type && dev->type->pm) {
@@ -832,19 +851,25 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
int error = 0;
dpm_wait_for_children(dev, async);
- device_lock(dev);
if (async_error)
- goto End;
+ return 0;
+
+ pm_runtime_get_noresume(dev);
+ if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
+ pm_wakeup_event(dev, 0);
if (pm_wakeup_pending()) {
+ pm_runtime_put_sync(dev);
async_error = -EBUSY;
- goto End;
+ return 0;
}
- if (dev->pwr_domain) {
+ device_lock(dev);
+
+ if (dev->pm_domain) {
pm_dev_dbg(dev, state, "power domain ");
- error = pm_op(dev, &dev->pwr_domain->ops, state);
+ error = pm_op(dev, &dev->pm_domain->ops, state);
goto End;
}
@@ -877,11 +902,17 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
}
End:
+ dev->power.is_suspended = !error;
+
device_unlock(dev);
complete_all(&dev->power.completion);
- if (error)
+ if (error) {
+ pm_runtime_put_sync(dev);
async_error = error;
+ } else if (dev->power.is_suspended) {
+ __pm_runtime_disable(dev, false);
+ }
return error;
}
@@ -968,11 +999,11 @@ static int device_prepare(struct device *dev, pm_message_t state)
device_lock(dev);
- if (dev->pwr_domain) {
+ if (dev->pm_domain) {
pm_dev_dbg(dev, state, "preparing power domain ");
- if (dev->pwr_domain->ops.prepare)
- error = dev->pwr_domain->ops.prepare(dev);
- suspend_report_result(dev->pwr_domain->ops.prepare, error);
+ if (dev->pm_domain->ops.prepare)
+ error = dev->pm_domain->ops.prepare(dev);
+ suspend_report_result(dev->pm_domain->ops.prepare, error);
if (error)
goto End;
} else if (dev->type && dev->type->pm) {
@@ -1021,13 +1052,7 @@ int dpm_prepare(pm_message_t state)
get_device(dev);
mutex_unlock(&dpm_list_mtx);
- pm_runtime_get_noresume(dev);
- if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
- pm_wakeup_event(dev, 0);
-
- pm_runtime_put_sync(dev);
- error = pm_wakeup_pending() ?
- -EBUSY : device_prepare(dev, state);
+ error = device_prepare(dev, state);
mutex_lock(&dpm_list_mtx);
if (error) {
@@ -1042,7 +1067,7 @@ int dpm_prepare(pm_message_t state)
put_device(dev);
break;
}
- dev->power.in_suspend = true;
+ dev->power.is_prepared = true;
if (!list_empty(&dev->power.entry))
list_move_tail(&dev->power.entry, &dpm_prepared_list);
put_device(dev);
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-20 15:30:29 +0100