[PATCH 1/3] [media] coda: round up frame sizes to multiples of 16 for MPEG-4 decoder

[PATCH 1/3] [media] coda: round up frame sizes to multiples of 16 for MPEG-4 decoder

[Philipp Zabel]

We need internal frames to be rounded up to full macroblocks for MPEG-4
decoding as well.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/platform/coda/coda-bit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index bfc4ecf6f068b..87002bede5ea1 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -395,6 +395,7 @@ static int coda_alloc_framebuffers(struct coda_ctx *ctx,
 
 	if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 ||
 	    ctx->codec->dst_fourcc == V4L2_PIX_FMT_H264 ||
+	    ctx->codec->src_fourcc == V4L2_PIX_FMT_MPEG4 ||
 	    ctx->codec->dst_fourcc == V4L2_PIX_FMT_MPEG4) {
 		width = round_up(q_data->width, 16);
 		height = round_up(q_data->height, 16);
-- 
2.11.0

[PATCH 2/3] [media] coda: allocate space for mpeg4 decoder mvcol buffer

[Philipp Zabel]

The MPEG-4 decoder mvcol buffer was registered, but its size not added
to a frame buffer allocation. This could cause the decoder to write past
the end of the allocated buffer for large frame sizes.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/platform/coda/coda-bit.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index 87002bede5ea1..32db1227d0258 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -414,8 +414,10 @@ static int coda_alloc_framebuffers(struct coda_ctx *ctx,
 			size = round_up(ysize, 4096) + ysize / 2;
 		else
 			size = ysize + ysize / 2;
-		if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 &&
-		    dev->devtype->product != CODA_DX6)
+		/* Add space for mvcol buffers */
+		if (dev->devtype->product != CODA_DX6 &&
+		    (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 ||
+		     (ctx->codec->src_fourcc == V4L2_PIX_FMT_MPEG4 && i == 0)))
 			size += ysize / 4;
 		name = kasprintf(GFP_KERNEL, "fb%d", i);
 		if (!name) {
-- 
2.11.0

[PATCH 3/3] [media] coda: use correct offset for mpeg4 decoder mvcol buffer

[Philipp Zabel]

The mvcol buffer needs to be placed behind the chroma plane(s) when
decoding MPEG-4, same as for the h.264 decoder. Use the real offset
with the required rounding.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/platform/coda/coda-bit.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index 32db1227d0258..9fe113cb901f8 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -455,18 +455,16 @@ static int coda_alloc_framebuffers(struct coda_ctx *ctx,
 		coda_parabuf_write(ctx, i * 3 + 1, cb);
 		coda_parabuf_write(ctx, i * 3 + 2, cr);
 
-		/* mvcol buffer for h.264 */
-		if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 &&
-		    dev->devtype->product != CODA_DX6)
+		if (dev->devtype->product == CODA_DX6)
+			continue;
+
+		/* mvcol buffer for h.264 and mpeg4 */
+		if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264)
 			coda_parabuf_write(ctx, 96 + i, mvcol);
+		if (ctx->codec->src_fourcc == V4L2_PIX_FMT_MPEG4 && i == 0)
+			coda_parabuf_write(ctx, 97, mvcol);
 	}
 
-	/* mvcol buffer for mpeg4 */
-	if ((dev->devtype->product != CODA_DX6) &&
-	    (ctx->codec->src_fourcc == V4L2_PIX_FMT_MPEG4))
-		coda_parabuf_write(ctx, 97, ctx->internal_frames[0].paddr +
-					    ysize + ysize/4 + ysize/4);
-
 	return 0;
 }
 
-- 
2.11.0