[media] media: i2c: adv748x: Map v4l2_std_id to the internal reg value

The video standard was not mapped to the corresponding value of the
internal video standard in adv748x_afe_querystd, causing the wrong
video standard to be selected.

Fixes: 3e89586a ("media: i2c: adv748x: add adv748x driver")
[Kieran: Obtain the std from the afe->curr_norm]
Signed-off-by: Simon Yuan <simon.yuan@navico.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/adv748x/adv748x-afe.c

@@ -217,6 +217,7 @@ static int adv748x_afe_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
 {
 	struct adv748x_afe *afe = adv748x_sd_to_afe(sd);
 	struct adv748x_state *state = adv748x_afe_to_state(afe);
+	int afe_std;
 	int ret;
 
 	mutex_lock(&state->mutex);
@@ -235,8 +236,12 @@ static int adv748x_afe_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
 	/* Read detected standard */
 	ret = adv748x_afe_status(afe, NULL, std);
 
+	afe_std = adv748x_afe_std(afe->curr_norm);
+	if (afe_std < 0)
+		goto unlock;
+
 	/* Restore original state */
-	adv748x_afe_set_video_standard(state, afe->curr_norm);
+	adv748x_afe_set_video_standard(state, afe_std);
 
 unlock:
 	mutex_unlock(&state->mutex);