[media] smiapp: Implement support for autosuspend

Delay suspending the device by 1000 ms by default. This is done on
explicit power off through s_power() callback, through releasing the
file descriptor, NVM read or when the probe finishes.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/i2c/smiapp/smiapp-core.c b/drivers/media/i2c/smiapp/smiapp-core.c
index 68adc1b28985a0439db2990645fb72558c9ff0ae..59872b31f832cb7983337e1ce1290a5eea1aa36a 100644 (file)
--- a/drivers/media/i2c/smiapp/smiapp-core.c
+++ b/drivers/media/i2c/smiapp/smiapp-core.c
@@ -1380,17 +1380,22 @@ static int smiapp_power_off(struct device *dev)
 
 static int smiapp_set_power(struct v4l2_subdev *subdev, int on)
 {
-       int rval = 0;
+       int rval;
 
-       if (on) {
-               rval = pm_runtime_get_sync(subdev->dev);
-               if (rval >= 0)
-                       return 0;
+       if (!on) {
+               pm_runtime_mark_last_busy(subdev->dev);
+               pm_runtime_put_autosuspend(subdev->dev);
 
-               if (rval != -EBUSY && rval != -EAGAIN)
-                       pm_runtime_set_active(subdev->dev);
+               return 0;
        }
 
+       rval = pm_runtime_get_sync(subdev->dev);
+       if (rval >= 0)
+               return 0;
+
+       if (rval != -EBUSY && rval != -EAGAIN)
+               pm_runtime_set_active(subdev->dev);
+
        pm_runtime_put(subdev->dev);
 
        return rval;
@@ -2340,7 +2345,8 @@ smiapp_sysfs_nvm_read(struct device *dev, struct device_attribute *attr,
                        return -ENODEV;
                }
 
-               pm_runtime_put(&client->dev);
+               pm_runtime_mark_last_busy(&client->dev);
+               pm_runtime_put_autosuspend(&client->dev);
        }
        /*
         * NVM is still way below a PAGE_SIZE, so we can safely
@@ -2681,7 +2687,8 @@ static int smiapp_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 
 static int smiapp_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 {
-       pm_runtime_put(sd->dev);
+       pm_runtime_mark_last_busy(sd->dev);
+       pm_runtime_put_autosuspend(sd->dev);
 
        return 0;
 }
@@ -3093,7 +3100,9 @@ static int smiapp_probe(struct i2c_client *client,
        if (rval < 0)
                goto out_media_entity_cleanup;
 
-       pm_runtime_put(&client->dev);
+       pm_runtime_set_autosuspend_delay(&client->dev, 1000);
+       pm_runtime_use_autosuspend(&client->dev);
+       pm_runtime_put_autosuspend(&client->dev);
 
        return 0;