diff --git a/drivers/staging/media/hantro/hantro_postproc.c b/drivers/staging/media/hantro/hantro_postproc.c
index ab168c1c0d28..b77cc55e43ea 100644
--- a/drivers/staging/media/hantro/hantro_postproc.c
+++ b/drivers/staging/media/hantro/hantro_postproc.c
@@ -12,6 +12,7 @@
 #include "hantro_hw.h"
 #include "hantro_g1_regs.h"
 #include "hantro_g2_regs.h"
+#include "hantro_v4l2.h"
 
 #define HANTRO_PP_REG_WRITE(vpu, reg_name, val) \
 { \
@@ -174,18 +175,27 @@ int hantro_postproc_alloc(struct hantro_ctx *ctx)
 	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
 	struct vb2_queue *cap_queue = &m2m_ctx->cap_q_ctx.q;
 	unsigned int num_buffers = cap_queue->num_buffers;
+	struct v4l2_pix_format_mplane pix_mp;
+	const struct hantro_fmt *fmt;
 	unsigned int i, buf_size;
 
-	buf_size = ctx->dst_fmt.plane_fmt[0].sizeimage;
+	/* this should always pick native format */
+	fmt = hantro_get_default_fmt(ctx, false);
+	if (!fmt)
+		return -EINVAL;
+	v4l2_fill_pixfmt_mp(&pix_mp, fmt->fourcc, ctx->src_fmt.width,
+			    ctx->src_fmt.height);
+
+	buf_size = pix_mp.plane_fmt[0].sizeimage;
 	if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_H264_SLICE)
-		buf_size += hantro_h264_mv_size(ctx->dst_fmt.width,
-						ctx->dst_fmt.height);
+		buf_size += hantro_h264_mv_size(pix_mp.width,
+						pix_mp.height);
 	else if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_VP9_FRAME)
-		buf_size += hantro_vp9_mv_size(ctx->dst_fmt.width,
-					       ctx->dst_fmt.height);
+		buf_size += hantro_vp9_mv_size(pix_mp.width,
+					       pix_mp.height);
 	else if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_HEVC_SLICE)
-		buf_size += hantro_hevc_mv_size(ctx->dst_fmt.width,
-						ctx->dst_fmt.height);
+		buf_size += hantro_hevc_mv_size(pix_mp.width,
+						pix_mp.height);
 
 	for (i = 0; i < num_buffers; ++i) {
 		struct hantro_aux_buf *priv = &ctx->postproc.dec_q[i];
diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
index 334f18a4120d..2c7a805289e7 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -118,7 +118,7 @@ hantro_find_format(const struct hantro_ctx *ctx, u32 fourcc)
 	return NULL;
 }
 
-static const struct hantro_fmt *
+const struct hantro_fmt *
 hantro_get_default_fmt(const struct hantro_ctx *ctx, bool bitstream)
 {
 	const struct hantro_fmt *formats;
diff --git a/drivers/staging/media/hantro/hantro_v4l2.h b/drivers/staging/media/hantro/hantro_v4l2.h
index b17e84c82582..64f6f57e9d7a 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.h
+++ b/drivers/staging/media/hantro/hantro_v4l2.h
@@ -23,5 +23,7 @@ extern const struct vb2_ops hantro_queue_ops;
 
 void hantro_reset_fmts(struct hantro_ctx *ctx);
 int hantro_get_format_depth(u32 fourcc);
+const struct hantro_fmt *
+hantro_get_default_fmt(const struct hantro_ctx *ctx, bool bitstream);
 
 #endif /* HANTRO_V4L2_H_ */