media: venus: helpers: handle correctly vbuf field

Correct handling of OUTPUT buffers field and make v4l2-compliance
happy.
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/qcom/venus/helpers.c

@@ -998,6 +998,17 @@ int venus_helper_vb2_buf_prepare(struct vb2_buffer *vb)
 {
 	struct venus_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
 	unsigned int out_buf_size = venus_helper_get_opb_size(inst);
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+
+	if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
+		if (vbuf->field == V4L2_FIELD_ANY)
+			vbuf->field = V4L2_FIELD_NONE;
+		if (vbuf->field != V4L2_FIELD_NONE) {
+			dev_err(inst->core->dev, "%s field isn't supported\n",
+				__func__);
+			return -EINVAL;
+		}
+	}
 
 	if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
 	    vb2_plane_size(vb, 0) < out_buf_size)