media: i2c: adv748x: Store the pixel rate ctrl on CSI objects

The current implementation has to search the list of controls for the
pixel rate control, each time it is set.  This can be optimised easily
by storing the ctrl pointer in the CSI/TX object, and referencing that
directly.

While at it, fix up a missing blank line also highlighted in review
comments.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -267,6 +267,7 @@ static int adv748x_afe_g_input_status(struct v4l2_subdev *sd, u32 *status)
 	ret = adv748x_afe_status(afe, status, NULL);
 
 	mutex_unlock(&state->mutex);
+
 	return ret;
 }
 

drivers/media/i2c/adv748x/adv748x-csi2.c

@@ -223,13 +223,12 @@ static const struct v4l2_subdev_ops adv748x_csi2_ops = {
 
 int adv748x_csi2_set_pixelrate(struct v4l2_subdev *sd, s64 rate)
 {
-	struct v4l2_ctrl *ctrl;
+	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
 
-	ctrl = v4l2_ctrl_find(sd->ctrl_handler, V4L2_CID_PIXEL_RATE);
-	if (!ctrl)
+	if (!tx->pixel_rate)
 		return -EINVAL;
 
-	return v4l2_ctrl_s_ctrl_int64(ctrl, rate);
+	return v4l2_ctrl_s_ctrl_int64(tx->pixel_rate, rate);
 }
 
 static int adv748x_csi2_s_ctrl(struct v4l2_ctrl *ctrl)
@@ -251,8 +250,10 @@ static int adv748x_csi2_init_controls(struct adv748x_csi2 *tx)
 
 	v4l2_ctrl_handler_init(&tx->ctrl_hdl, 1);
 
-	v4l2_ctrl_new_std(&tx->ctrl_hdl, &adv748x_csi2_ctrl_ops,
-			  V4L2_CID_PIXEL_RATE, 1, INT_MAX, 1, 1);
+	tx->pixel_rate = v4l2_ctrl_new_std(&tx->ctrl_hdl,
+					   &adv748x_csi2_ctrl_ops,
+					   V4L2_CID_PIXEL_RATE, 1, INT_MAX,
+					   1, 1);
 
 	tx->sd.ctrl_handler = &tx->ctrl_hdl;
 	if (tx->ctrl_hdl.error) {

drivers/media/i2c/adv748x/adv748x.h

@@ -97,6 +97,7 @@ struct adv748x_csi2 {
 
 	struct media_pad pads[ADV748X_CSI2_NR_PADS];
 	struct v4l2_ctrl_handler ctrl_hdl;
+	struct v4l2_ctrl *pixel_rate;
 	struct v4l2_subdev sd;
 };