On Tuesday, August 20, 2013 05:03:36 PM Mika Westerberg wrote: > From: Lv Zheng <lv.zh...@intel.com> > > If the I2C client device is enumerated from ACPI namespace it might have > ACPI methods that needs to be called in order to transition the device to > a different power states (such as _PSx). > > Implement this for I2C client devices by checking if the device has an ACPI > handle and if that's the case, attach it to the ACPI power domain. In > addition we make sure that the device is fully powered when its ->probe() > function gets called. > > For non-ACPI devices this patch is a no-op. > > Signed-off-by: Lv Zheng <lv.zh...@intel.com> > Signed-off-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > --- > drivers/i2c/i2c-core.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c > index 8fad5ac..fdf086b 100644 > --- a/drivers/i2c/i2c-core.c > +++ b/drivers/i2c/i2c-core.c > @@ -257,6 +257,9 @@ static int i2c_device_probe(struct device *dev) > /* Make sure the adapter is active */ > pm_runtime_get_sync(&client->adapter->dev); > > + if (ACPI_HANDLE(&client->dev)) > + acpi_dev_pm_attach(&client->dev, true); > + > /* > * Enable runtime PM for the client device. If the client wants to > * participate on runtime PM it should call pm_runtime_put() in its > @@ -278,6 +281,9 @@ static int i2c_device_probe(struct device *dev) > pm_runtime_disable(&client->dev); > pm_runtime_set_suspended(&client->dev); > pm_runtime_put_noidle(&client->dev); > + > + if (ACPI_HANDLE(&client->dev)) > + acpi_dev_pm_detach(&client->dev, true); > } > > pm_runtime_put(&client->adapter->dev); > @@ -314,6 +320,9 @@ static int i2c_device_remove(struct device *dev) > pm_runtime_set_suspended(&client->dev); > pm_runtime_put_noidle(&client->dev); > > + if (ACPI_HANDLE(&client->dev)) > + acpi_dev_pm_detach(&client->dev, true); > + > pm_runtime_put(&client->adapter->dev); > return status; > } > -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
