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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-03-20 13:59:27 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-03-22 22:14:12 +0100
commite90d5532773e2bcccc538dd346b9fc3482cd700c (patch)
tree84ee8ca4022e8538f871cd89a5ee43bf21338fc7 /drivers/base
parenteea97aed815ac25b9435a556fce345d257f47405 (diff)
downloadop-kernel-dev-e90d5532773e2bcccc538dd346b9fc3482cd700c.zip
op-kernel-dev-e90d5532773e2bcccc538dd346b9fc3482cd700c.tar.gz
driver core / PM: Add PM domain callbacks for device setup/cleanup
If PM domains are in use, it may be necessary to prepare the code handling a PM domain for driver probing. For example, in some cases device drivers rely on the ability to power on the devices with the help of the IO runtime PM framework and the PM domain code needs to be ready for that. Also, if that code has not been fully initialized yet, the driver probing should be deferred. Moreover, after the probing is complete, it may be necessary to put the PM domain in question into the state reflecting the current needs of the devices in it, for example, so that power is not drawn in vain. The same should be done after removing a driver from a device, as the PM domain state may need to be changed to reflect the new situation. For these reasons, introduce new PM domain callbacks, ->activate, ->sync and ->dismiss called, respectively, before probing for a device driver, after the probing has completed successfully and if the probing has failed or the driver has been removed. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/dd.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index cdc779c..aeb7448 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -298,6 +298,12 @@ static int really_probe(struct device *dev, struct device_driver *drv)
goto probe_failed;
}
+ if (dev->pm_domain && dev->pm_domain->activate) {
+ ret = dev->pm_domain->activate(dev);
+ if (ret)
+ goto probe_failed;
+ }
+
if (dev->bus->probe) {
ret = dev->bus->probe(dev);
if (ret)
@@ -308,6 +314,9 @@ static int really_probe(struct device *dev, struct device_driver *drv)
goto probe_failed;
}
+ if (dev->pm_domain && dev->pm_domain->sync)
+ dev->pm_domain->sync(dev);
+
driver_bound(dev);
ret = 1;
pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
@@ -319,6 +328,8 @@ probe_failed:
driver_sysfs_remove(dev);
dev->driver = NULL;
dev_set_drvdata(dev, NULL);
+ if (dev->pm_domain && dev->pm_domain->dismiss)
+ dev->pm_domain->dismiss(dev);
if (ret == -EPROBE_DEFER) {
/* Driver requested deferred probing */
@@ -525,6 +536,9 @@ static void __device_release_driver(struct device *dev)
devres_release_all(dev);
dev->driver = NULL;
dev_set_drvdata(dev, NULL);
+ if (dev->pm_domain && dev->pm_domain->dismiss)
+ dev->pm_domain->dismiss(dev);
+
klist_remove(&dev->p->knode_driver);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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