media: coda: add RC enable controls

Currently the encoder enables the rate control algorithms if the bitrate
control is non-zero. Implement the V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE
and V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE controls to allow userspace to
choose frame-level or macroblock-level rate control updates, or to
explicitly disable rate control. Both controls are initially enabled to
keep the current behavior.

Signed-off-by: Philipp Zabel <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

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

···
 		coda_write(dev, value, CODA_CMD_ENC_SEQ_GOP_SIZE);
 	}
 
-	if (ctx->params.bitrate) {
+	if (ctx->params.bitrate && (ctx->params.frame_rc_enable ||
+				    ctx->params.mb_rc_enable)) {
 		ctx->params.bitrate_changed = false;
 		ctx->params.h264_intra_qp_changed = false;
 
···
 	}
 	coda_write(dev, value, CODA_CMD_ENC_SEQ_OPTION);
 
-	coda_write(dev, 0, CODA_CMD_ENC_SEQ_RC_INTERVAL_MODE);
+	if (ctx->params.frame_rc_enable && !ctx->params.mb_rc_enable)
+		value = 1;
+	else
+		value = 0;
+	coda_write(dev, value, CODA_CMD_ENC_SEQ_RC_INTERVAL_MODE);
 
 	coda_setup_iram(ctx);
 

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

···
 	case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
 		ctx->params.h264_constrained_intra_pred_flag = ctrl->val;
 		break;
+	case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
+		ctx->params.frame_rc_enable = ctrl->val;
+		break;
+	case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
+		ctx->params.mb_rc_enable = ctrl->val;
+		break;
 	case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET:
 		ctx->params.h264_chroma_qp_index_offset = ctrl->val;
 		break;
···
 	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
 		V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION, 0, 1, 1,
 		0);
+	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
+		V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE, 0, 1, 1, 1);
+	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
+		V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE, 0, 1, 1, 1);
 	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
 		V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET, -12, 12, 1, 0);
 	v4l2_ctrl_new_std_menu(&ctx->ctrls, &coda_ctrl_ops,

drivers/media/platform/coda/coda.h

···
 	bool			h264_intra_qp_changed;
 	bool			intra_refresh_changed;
 	bool			slice_mode_changed;
+	bool			frame_rc_enable;
+	bool			mb_rc_enable;
 };
 
 struct coda_buffer_meta {