[media] coda: implement VBV delay and buffer size controls

The encoder allows to specify the VBV model reference decoder's initial
delay and buffer size. Export the corresponding V4L2 controls.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/coda/coda-bit.c

@@ -922,6 +922,9 @@ static int coda_start_encoding(struct coda_ctx *ctx)
 		value = (ctx->params.bitrate & CODA_RATECONTROL_BITRATE_MASK)
 			<< CODA_RATECONTROL_BITRATE_OFFSET;
 		value |=  1 & CODA_RATECONTROL_ENABLE_MASK;
+		value |= (ctx->params.vbv_delay &
+			  CODA_RATECONTROL_INITIALDELAY_MASK)
+			 << CODA_RATECONTROL_INITIALDELAY_OFFSET;
 		if (dev->devtype->product == CODA_960)
 			value |= BIT(31); /* disable autoskip */
 	} else {
@@ -929,7 +932,7 @@ static int coda_start_encoding(struct coda_ctx *ctx)
 	}
 	coda_write(dev, value, CODA_CMD_ENC_SEQ_RC_PARA);
 
-	coda_write(dev, 0, CODA_CMD_ENC_SEQ_RC_BUF_SIZE);
+	coda_write(dev, ctx->params.vbv_size, CODA_CMD_ENC_SEQ_RC_BUF_SIZE);
 	coda_write(dev, ctx->params.intra_refresh,
 		   CODA_CMD_ENC_SEQ_INTRA_REFRESH);
 

drivers/media/platform/coda/coda-common.c

@@ -1400,6 +1400,12 @@ static int coda_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_JPEG_RESTART_INTERVAL:
 		ctx->params.jpeg_restart_interval = ctrl->val;
 		break;
+	case V4L2_CID_MPEG_VIDEO_VBV_DELAY:
+		ctx->params.vbv_delay = ctrl->val;
+		break;
+	case V4L2_CID_MPEG_VIDEO_VBV_SIZE:
+		ctx->params.vbv_size = min(ctrl->val * 8192, 0x7fffffff);
+		break;
 	default:
 		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
 			"Invalid control, id=%d, val=%d\n",
@@ -1459,6 +1465,14 @@ static void coda_encode_ctrls(struct coda_ctx *ctx)
 	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
 		V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB, 0,
 		1920 * 1088 / 256, 1, 0);
+	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
+		V4L2_CID_MPEG_VIDEO_VBV_DELAY, 0, 0x7fff, 1, 0);
+	/*
+	 * The maximum VBV size value is 0x7fffffff bits,
+	 * one bit less than 262144 KiB
+	 */
+	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
+		V4L2_CID_MPEG_VIDEO_VBV_SIZE, 0, 262144, 1, 0);
 }
 
 static void coda_jpeg_encode_ctrls(struct coda_ctx *ctx)

drivers/media/platform/coda/coda.h

@@ -128,6 +128,8 @@ struct coda_params {
 	enum v4l2_mpeg_video_multi_slice_mode slice_mode;
 	u32			framerate;
 	u16			bitrate;
+	u16			vbv_delay;
+	u32			vbv_size;
 	u32			slice_max_bits;
 	u32			slice_max_mb;
 };