media: venus: support frame rate control

Add encoder control for enabling/disabling frame rate control via
V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE. It is enabled by default.
Signed-off-by: Jeffrey Kardatzke <jkardatzke@google.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/qcom/venus/core.h

@@ -198,6 +198,7 @@ struct venc_controls {
 	u32 bitrate_mode;
 	u32 bitrate;
 	u32 bitrate_peak;
+	u32 rc_enable;
 
 	u32 h264_i_period;
 	u32 h264_entropy_mode;

drivers/media/platform/qcom/venus/venc.c

@@ -728,7 +728,9 @@ static int venc_set_properties(struct venus_inst *inst)
 	if (ret)
 		return ret;
 
-	if (ctr->bitrate_mode == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR)
+	if (!ctr->rc_enable)
+		rate_control = HFI_RATE_CONTROL_OFF;
+	else if (ctr->bitrate_mode == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR)
 		rate_control = HFI_RATE_CONTROL_VBR_CFR;
 	else
 		rate_control = HFI_RATE_CONTROL_CBR_CFR;

drivers/media/platform/qcom/venus/venc_ctrls.c

@@ -199,6 +199,9 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
 		}
 		mutex_unlock(&inst->lock);
 		break;
+	case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
+		ctr->rc_enable = ctrl->val;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -214,7 +217,7 @@ int venc_ctrl_init(struct venus_inst *inst)
 {
 	int ret;
 
-	ret = v4l2_ctrl_handler_init(&inst->ctrl_handler, 30);
+	ret = v4l2_ctrl_handler_init(&inst->ctrl_handler, 31);
 	if (ret)
 		return ret;
 
@@ -351,6 +354,9 @@ int venc_ctrl_init(struct venus_inst *inst)
 	v4l2_ctrl_new_std(&inst->ctrl_handler, &venc_ctrl_ops,
 			  V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME, 0, 0, 0, 0);
 
+	v4l2_ctrl_new_std(&inst->ctrl_handler, &venc_ctrl_ops,
+			  V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE, 0, 1, 1, 1);
+
 	ret = inst->ctrl_handler.error;
 	if (ret)
 		goto err;