[PATCH v2 05/10] media: hantro: Reduce H264 extra space for motion vectors

[Jonas Karlman <jonas@kwiboo.se>]

A decoded 8-bit 4:2:0 frame need memory for up to 448 bytes per
macroblock with additional 32 bytes on multi-core variants.

Memory layout is as follow:

+---------------------------+
| Y-plane   256 bytes x MBs |
+---------------------------+
| UV-plane  128 bytes x MBs |
+---------------------------+
| MV buffer  64 bytes x MBs |
+---------------------------+
| MC sync          32 bytes |
+---------------------------+

Reduce the extra space allocated now that motion vector buffer offset no
longer is based on the extra space.

Only allocate extra space for 64 bytes x MBs of motion vector buffer
and 32 bytes for multi-core sync.

Fixes: a9471e25629b ("media: hantro: Add core bits to support H264 decoding")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
Changes in v2:
  - updated commit message
---
 drivers/staging/media/hantro/hantro_v4l2.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
index 3dae52abb96c..b3a4368b37de 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -242,12 +242,12 @@ static int vidioc_try_fmt(struct file *file, void *priv, struct v4l2_format *f,
 		/*
 		 * The H264 decoder needs extra space on the output buffers
 		 * to store motion vectors. This is needed for reference
-		 * frames.
+		 * frames. 32 extra bytes is used for multi-core sync.
 		 */
 		if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_H264_SLICE)
 			pix_mp->plane_fmt[0].sizeimage +=
-				128 * DIV_ROUND_UP(pix_mp->width, 16) *
-				      DIV_ROUND_UP(pix_mp->height, 16);
+				64 * MB_WIDTH(pix_mp->width) *
+				     MB_WIDTH(pix_mp->height) + 32;
 	} else if (!pix_mp->plane_fmt[0].sizeimage) {
 		/*
 		 * For coded formats the application can specify
-- 
2.17.1