[media] coda: don't ever use subsampling ping-pong buffers as reconstructed reference buffers

On i.MX6, two subsampling ping-pong buffers are used for motion estimation and
deblocking They should not be counted as framebuffers, or they will be also used
to store reconstructed frames, causing visible artifacts in P-frames.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index 6ecfd29b7d98..7cdddd55d65d 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -718,6 +718,7 @@ static int coda_start_encoding(struct coda_ctx *ctx)
         struct vb2_buffer *buf;
         int gamma, ret, value;
         u32 dst_fourcc;
+        int num_fb;
         u32 stride;
 
         q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
@@ -983,12 +984,14 @@ static int coda_start_encoding(struct coda_ctx *ctx)
                         v4l2_err(v4l2_dev, "failed to allocate framebuffers\n");
                         goto out;
                 }
+                num_fb = 2;
                 stride = q_data_src->bytesperline;
         } else {
                 ctx->num_internal_frames = 0;
+                num_fb = 0;
                 stride = 0;
         }
-        coda_write(dev, ctx->num_internal_frames, CODA_CMD_SET_FRAME_BUF_NUM);
+        coda_write(dev, num_fb, CODA_CMD_SET_FRAME_BUF_NUM);
         coda_write(dev, stride, CODA_CMD_SET_FRAME_BUF_STRIDE);
 
         if (dev->devtype->product == CODA_7541) {