[PATCH v2] i2c: enable i2c adapter to suspend/resume asynchronously

[Fu, Zhonghui]

Now, PM core supports asynchronous suspend/resume mode for devices
during system suspend/resume, and the power state transition of one
device may be completed in separate kernel thread. PM core ensures
all power state transition timing dependency between devices. This
patch enables i2c adapter to suspend/resume asynchronously. This
will take advantage of multicore and improve system suspend/resume
speed.

Signed-off-by: Zhonghui Fu <zhonghui.fu@xxxxxxxxxxxxxxx>
---
Changes in v2:
- Amend commit message.

 drivers/i2c/i2c-core.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 5f89f1e..c273b55 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1528,6 +1528,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 
 	pm_runtime_no_callbacks(&adap->dev);
 
+	device_enable_async_suspend(&adap->dev);
+
 #ifdef CONFIG_I2C_COMPAT
 	res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev,
 				       adap->dev.parent);
-- 1.7.1

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