A default value of 0 means V4L2_FIELD_ANY, which is not correct.
Reported by v4l2-compliance.

Signed-off-by: Alexandre Courbot <acour...@chromium.org>
Acked-by: Tiffany Lin <tiffany....@mediatek.com>
---
 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c 
b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
index f833aee4a06f..1a981d842c19 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
@@ -893,8 +893,17 @@ static void vb2ops_venc_stop_streaming(struct vb2_queue *q)
        ctx->state = MTK_STATE_FREE;
 }
 
+static int vb2ops_venc_buf_out_validate(struct vb2_buffer *vb)
+{
+       struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+
+       vbuf->field = V4L2_FIELD_NONE;
+       return 0;
+}
+
 static const struct vb2_ops mtk_venc_vb2_ops = {
        .queue_setup            = vb2ops_venc_queue_setup,
+       .buf_out_validate       = vb2ops_venc_buf_out_validate,
        .buf_prepare            = vb2ops_venc_buf_prepare,
        .buf_queue              = vb2ops_venc_buf_queue,
        .wait_prepare           = vb2_ops_wait_prepare,
-- 
2.27.0.383.g050319c2ae-goog

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