Add a check to g_volatile_ctrl to prevent trying to read
registers when the sensor is not powered.
Signed-off-by: Sam Bobrowicz <sam@xxxxxxxxxxxxxxxxxx>
---
drivers/media/i2c/ov5640.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index f183222..a50d884 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -2336,6 +2336,13 @@ static int ov5640_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
/* v4l2_ctrl_lock() locks our own mutex */
+ /*
+ * If the sensor is not powered up by the host driver, do
+ * not try to access it to update the volatile controls.
+ */
+ if (sensor->power_count == 0)
+ return 0;
+
switch (ctrl->id) {
case V4L2_CID_AUTOGAIN:
val = ov5640_get_gain(sensor);
--
2.7.4
