i2c/designware: enable i2c controller to suspend/resume asynchronously

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 controller to suspend/resume asynchronously. This will take advantage of multicore and improve system suspend/resume speed.

Signed-off-by Zhonghui Fu <[email protected]>

---
Changes in v2:
- Amend commit message.

 drivers/i2c/busses/i2c-designware-platdrv.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

drivers/i2c/busses/i2c-designware-platdrv.c +1 -1

index 3dd2de3..fec0fce 100644
@@ -245,6 +245,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
 
 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
+	device_enable_async_suspend(&pdev->dev);
 	adap->owner = THIS_MODULE;
 	adap->class = I2C_CLASS_DEPRECATED;
 	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
-- 1.7.1