[media] soc-camera: Push probe-time power management to drivers

Several client drivers access the hardware at probe time, for instance
to read the probe chip ID. Such chips need to be powered up when being
probed.

soc-camera handles this by powering chips up in the soc-camera probe
implementation. However, this will break with non soc-camera hosts that
don't perform the same operations.

Fix the problem by pushing the power up/down from the soc-camera core
down to individual drivers on a needs basis.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/media/i2c/soc_camera/mt9v022.c b/drivers/media/i2c/soc_camera/mt9v022.c
index 5f09cb702bf7..2edea8489092 100644
--- a/drivers/media/i2c/soc_camera/mt9v022.c
+++ b/drivers/media/i2c/soc_camera/mt9v022.c
@@ -578,6 +578,10 @@ static int mt9v022_video_probe(struct i2c_client *client)
         int ret;
         unsigned long flags;
 
+        ret = mt9v022_s_power(&mt9v022->subdev, 1);
+        if (ret < 0)
+                return ret;
+
         /* Read out the chip version register */
         data = reg_read(client, MT9V022_CHIP_VERSION);
 
@@ -648,6 +652,7 @@ static int mt9v022_video_probe(struct i2c_client *client)
                 dev_err(&client->dev, "Failed to initialise the camera\n");
 
 ei2c:
+        mt9v022_s_power(&mt9v022->subdev, 0);
         return ret;
 }