[PATCH 1/5] [media] coda: extend GOP size range

[Philipp Zabel]

CodaDx6 only accepts GOP sizes up to 60 frames, but CODA960 can handle
up to 99 frames. If we disable automatic I frame generation altogether
by setting GOP size to 0, we can let an application produce arbitrarily
large I frame intervals using the V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME
control.

Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
 drivers/media/platform/coda/coda-bit.c    | 5 +++--
 drivers/media/platform/coda/coda-common.c | 4 +++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/coda/coda-bit.c 
b/drivers/media/platform/coda/coda-bit.c
index bba1eb43b5d83..50eed636830f8 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -1006,7 +1006,7 @@ static int coda_start_encoding(struct coda_ctx *ctx)
                        break;
                }
                coda_write(dev, value, CODA_CMD_ENC_SEQ_SLICE_MODE);
-               value = ctx->params.gop_size & CODA_GOP_SIZE_MASK;
+               value = ctx->params.gop_size;
                coda_write(dev, value, CODA_CMD_ENC_SEQ_GOP_SIZE);
        }
 
@@ -1250,7 +1250,8 @@ static int coda_prepare_encode(struct coda_ctx *ctx)
        force_ipicture = ctx->params.force_ipicture;
        if (force_ipicture)
                ctx->params.force_ipicture = false;
-       else if ((src_buf->sequence % ctx->params.gop_size) == 0)
+       else if (ctx->params.gop_size != 0 &&
+                (src_buf->sequence % ctx->params.gop_size) == 0)
                force_ipicture = 1;
 
        /*
diff --git a/drivers/media/platform/coda/coda-common.c 
b/drivers/media/platform/coda/coda-common.c
index 829c7895a98a2..218d778a9c45a 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -1734,10 +1734,12 @@ static const struct v4l2_ctrl_ops coda_ctrl_ops = {
 
 static void coda_encode_ctrls(struct coda_ctx *ctx)
 {
+       int max_gop_size = (ctx->dev->devtype->product == CODA_DX6) ? 60 : 99;
+
        v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
                V4L2_CID_MPEG_VIDEO_BITRATE, 0, 32767000, 1000, 0);
        v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
-               V4L2_CID_MPEG_VIDEO_GOP_SIZE, 1, 60, 1, 16);
+               V4L2_CID_MPEG_VIDEO_GOP_SIZE, 0, max_gop_size, 1, 16);
        v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
                V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP, 0, 51, 1, 25);
        v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
-- 
2.11.0