[media] s5p-mfc: use MFC_BUF_FLAG_EOS to identify last buffers in decoder capture queue

MFC driver never delivered EOS event to apps feeding constantly its capture
buffer with fresh buffers. The patch fixes it by marking last buffers
returned by MFC with MFC_BUF_FLAG_EOS flag and firing EOS event on
de-queuing such buffers.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/s5p-mfc/s5p_mfc.c

@@ -196,6 +196,7 @@ static void s5p_mfc_handle_frame_all_extracted(struct s5p_mfc_ctx *ctx)
 		vb2_set_plane_payload(&dst_buf->b->vb2_buf, 0, 0);
 		vb2_set_plane_payload(&dst_buf->b->vb2_buf, 1, 0);
 		list_del(&dst_buf->list);
+		dst_buf->flags |= MFC_BUF_FLAG_EOS;
 		ctx->dst_queue_cnt--;
 		dst_buf->b->sequence = (ctx->sequence++);
 

drivers/media/platform/s5p-mfc/s5p_mfc_dec.c

@@ -645,17 +645,22 @@ static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 		mfc_err("Call on DQBUF after unrecoverable error\n");
 		return -EIO;
 	}
-	if (buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
-		ret = vb2_dqbuf(&ctx->vq_src, buf, file->f_flags & O_NONBLOCK);
-	else if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+
+	switch (buf->type) {
+	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
+		return vb2_dqbuf(&ctx->vq_src, buf, file->f_flags & O_NONBLOCK);
+	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 		ret = vb2_dqbuf(&ctx->vq_dst, buf, file->f_flags & O_NONBLOCK);
-		if (ret == 0 && ctx->state == MFCINST_FINISHED &&
-				list_empty(&ctx->vq_dst.done_list))
+		if (ret)
+			return ret;
+
+		if (ctx->state == MFCINST_FINISHED &&
+		    (ctx->dst_bufs[buf->index].flags & MFC_BUF_FLAG_EOS))
 			v4l2_event_queue_fh(&ctx->fh, &ev);
-	} else {
-		ret = -EINVAL;
+		return 0;
+	default:
+		return -EINVAL;
 	}
-	return ret;
 }
 
 /* Export DMA buffer */