media: renesas: vsp1: Drop custom .get_fmt() handler for histogram

The histogram module is the only one that has a custom .get_fmt()
handler, to handle the special case of the output format being fixed.
This can equally well be handled in the .set_fmt() handler instead.
Beside avoiding special cases and using the same .get_fmt() handler in
all modules, it ensures that the correct format is stored in the active
state for the source pad, including when .set_fmt() is called from
vsp1_entity_init_state(). Both are needed to later switch to the V4L2
subdev active state API.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

drivers/media/platform/renesas/vsp1/vsp1_histo.c

@@ -352,31 +352,22 @@ static int histo_set_selection(struct v4l2_subdev *subdev,
 	return ret;
 }
 
-static int histo_get_format(struct v4l2_subdev *subdev,
+static int histo_set_format(struct v4l2_subdev *subdev,
 			    struct v4l2_subdev_state *sd_state,
 			    struct v4l2_subdev_format *fmt)
 {
+	struct vsp1_histogram *histo = subdev_to_histo(subdev);
+
 	if (fmt->pad == HISTO_PAD_SOURCE) {
 		fmt->format.code = MEDIA_BUS_FMT_FIXED;
 		fmt->format.width = 0;
 		fmt->format.height = 0;
 		fmt->format.field = V4L2_FIELD_NONE;
 		fmt->format.colorspace = V4L2_COLORSPACE_RAW;
+
 		return 0;
 	}
 
-	return vsp1_subdev_get_pad_format(subdev, sd_state, fmt);
-}
-
-static int histo_set_format(struct v4l2_subdev *subdev,
-			    struct v4l2_subdev_state *sd_state,
-			    struct v4l2_subdev_format *fmt)
-{
-	struct vsp1_histogram *histo = subdev_to_histo(subdev);
-
-	if (fmt->pad != HISTO_PAD_SINK)
-		return histo_get_format(subdev, sd_state, fmt);
-
 	return vsp1_subdev_set_pad_format(subdev, sd_state, fmt,
 					  histo->formats, histo->num_formats,
 					  HISTO_MIN_SIZE, HISTO_MIN_SIZE,
@@ -386,7 +377,7 @@ static int histo_set_format(struct v4l2_subdev *subdev,
 static const struct v4l2_subdev_pad_ops histo_pad_ops = {
 	.enum_mbus_code = histo_enum_mbus_code,
 	.enum_frame_size = histo_enum_frame_size,
-	.get_fmt = histo_get_format,
+	.get_fmt = vsp1_subdev_get_pad_format,
 	.set_fmt = histo_set_format,
 	.get_selection = histo_get_selection,
 	.set_selection = histo_set_selection,