Camera | 8.让rk3568支持前后置摄像头

一、目标

本文主要目标是，支持前置摄像头0v5648、后置摄像头ov13850，以及移植过程遇到的一些小问题的解决。

1. 摄像头连接图

参考上图，摄像头详细信息如下：

• 2个摄像头均连接在I2C通道4
• 2个摄像头共用同一个MIPI数据通道
• 2个摄像头各自有独立的rst、pwdn引脚
• rkw提供的sdk中已经提供camera时钟的设备树信息，此处选择对应时钟即可
• ov13850用到4个lane，0v5648用到2个lane
• 摄像头的片选通过select-gpios来选择，拉低选择0v13850,拉高选择ov5684

三、设备树

根据上述摄像头硬件信息，设备树信息如下：

• reg：该模块输入端点序号
• remot-endpoint ：输出端点的名字，在下面设备树信息中列举出来
• data-lanes ：数据通道信息

四、驱动

rxw sdk中已经有这两个摄像头的驱动，但是需要增加片选的逻辑，

根据前面文章，

《Camera | 4.瑞芯微平台MIPI摄像头应用程序编写》

可知开启和关闭摄像头视频流通过以下命令：

VIDIOC_STREAMON， VIDIOC_STREAMOFF

对应的回调函数

static int ov5648_s_stream(struct v4l2_subdev *sd, int on)

除此之外，power控制的回调函数

static int ov5648_s_power(struct v4l2_subdev *sd, int on)

我们只需要在这对应的回调函数中增加select-gpio的操作即可。

所有修改代码如下：

+#include <linux/gpio.h>
+#include <linux/of_gpio.h>

+static int select_gpios;//前置摄像头使能

static int ov5648_s_stream(struct v4l2_subdev *sd, int on)
{
	……

	if (on) {
+			gpio_direction_output(select_gpios, 1);
+			usleep_range(1000, 2000);
			……
	} else {
		……
+			gpio_direction_output(select_gpios, 0);
+			usleep_range(1000, 2000);		
	}
	……
}

static int ov5648_s_power(struct v4l2_subdev *sd, int on)
{
	……
	if (on) {
+			gpio_direction_output(select_gpios, 1);
+			usleep_range(1000, 2000);
		……
	} else {
+			gpio_direction_output(select_gpios, 0);
		……
	}
	……
}

static void __ov5648_power_off(struct ov5648 *ov5648)
{
	int ret;
	struct device *dev = &ov5648->client->dev;
+		gpio_direction_output(select_gpios, 0);
	……
}

static int ov5648_probe(struct i2c_client *client,
	……
+	struct device_node *np;
+
+	np = dev->of_node;
 
	……

+	select_gpios = of_get_named_gpio(np, "select-gpios", 0);
+
+	ret = gpio_request(select_gpios, "select-gpios");
+	if (ret < 0) {
+		dev_err(dev,"Failed to request GPIO:%d, ERRNO:%d", (s32) select_gpios, ret);
+		//return ret;
+	}
+	printk("ov5648 select_gpios=%d",select_gpios);
	……

五、拓扑结构

加载成功后查看拓扑结构，会有以下entity 信息：

- entity 70: m01_f_ov5648 4-0036 (1 pad, 1 link)
             type V4L2 subdev subtype Sensor
             device node name /dev/v4l-subdev3
        pad0: Source
                [fmt:SBGGR10/2592x1944]
                -> "rockchip-csi2-dphy0":0 []

- entity 74: m00_b_ov13850 4-0010 (1 pad, 1 link)
             type V4L2 subdev subtype Sensor
             device node name /dev/v4l-subdev4
        pad0: Source
                [fmt:SBGGR10/4224x3136]
                -> "rockchip-csi2-dphy0":0 [ENABLED]

说明pipe通路ok。

六、xml配置文件

要让安卓识别前后置摄像头，还需要在以下文件增加后置摄像头ov13850、前置摄像头ov5684信息

@hardware/rockchip/camera/etc/camera/camera3_profiles.xml
@hardware/rockchip/camera/etc/camera/camera3_profiles_rk356x.xml

在这两个xml文件中增加这两个摄像头信息即可，

一口君是按照其他摄像头内容修改的，

ov5684因为分辨率问题，需要注意不要超过最大值。

获取xml文件，可以后台回复：rxw

七、切换后，前置摄像头打不开bug

开机后用命令抓帧，用的是前置摄像头

打开app后，界面显示的是后置摄像头信息

但是点解界面的切换按钮，获取不到前置摄像头图像，

在不重启的情况下要操作后置摄像头，执行下面操作即可。

Settings->apps&notifications
SEE ALL 16 APPS
选择最近应用  Camera
Storage&cache
    点击
    clear storage
 然后退出重新打开摄像头APP即可

1. 错误分析

1. 首先在ov5648驱动的加上log

static int ov5648_s_stream(struct v4l2_subdev *sd, int on)
{
	……
	on = !!on;

	printk("6902 %s(%d) enter! %d\n", __func__, __LINE__,on);

	if (on == ov5648->streaming)
		goto unlock_and_return;

	if (on) {
		……
	} else {
		……
	}

	ov5648->streaming = on;

}

发现切换的时候没有执行该函数，所以定位是APP测出了问题

2. 查看catlog

03-01 02:40:30.062  1699  1749 I CAM_Profiler: [ 67.906ms] GUARD: CaptureModule.openCameraAndStartPreview() - [67.565ms] mOneCameraOpener.open()
03-01 02:40:30.062  1699  1749 I CAM_Profiler: [ 67.906ms] GUARD: CaptureModule.openCameraAndStartPreview() - STOP
03-01 02:40:30.063  1699  1741 E CAM_OneCamFtrCnfgCrtr: Unknown support level: 0
03-01 02:40:30.063  1699  1741 I CAM_OneCamCreator: Camera support level: LIMITED_JPEG
03-01 02:40:30.063  1699  1741 W CAM_Log : Tag SimpleOneCameraFactory is 3 chars longer than limit.
03-01 02:40:30.063  1699  1741 I CAM_OneCamCreator: Picture Size Configuration: PictureSizeCalculator.Configuration{native size=3264x2448, crop=Rect(0, 0 - 3264, 2448)}
03-01 02:40:30.065  1699  1741 D CAM_CaptureModule: onCameraOpened: com.android.camera.one.v2.initialization.GenericOneCameraImpl@200eae9
03-01 02:40:30.065  1699  1741 D CAM_CaptureModule: picturesize:3264x2448,previewBuffer:1280x960
03-01 02:40:30.065  1699  1741 D CAM_CaptureModule: starting preview ...
03-01 02:40:30.068  1699  1699 W CAM_IndicatorIconCtrlr: Trying to sync a pano indicator that is not initialized.
03-01 02:40:30.068   349   349 W CameraDeviceClient: createSurfaceFromGbp: Camera 1 with consumer usage flag: 256: Forcing asynchronous mode for stream
03-01 02:40:30.068   349   349 W CameraDeviceClient: createSurfaceFromGbp: Camera 1: Overriding format 0x1 to IMPLEMENTATION_DEFINED
03-01 02:40:30.069   265   265 D Camera3HAL: configure_streams: streams list ptr: 0xf6242dd0, num 2
    
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfig: @selectSensorOutputFormat : App stream size(3264x2448) larger than Sensor full size(2592x1944), Check camera3_profiles.xml
    
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfigManager: Couldn't get mediaCtl config
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> V4L2Subdev: queryDvTimings, ret:-1, I:0, wxh:0x0
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> V4L2Subdev: VIDIOC_SUBDEV_QUERY_DV_TIMINGS failed: Inappropriate ioctl for device
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> PlatformData: Error queryDvTimings ret:-2147483648 (/dev/v4l-subdev3)
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> PlatformData: Error closing device (/dev/v4l-subdev3)
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfig: getMediaDevInfo info.model:rkisp0
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfigManager: Couldn't get Imgu mediaCtl config
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2ImguUnit: Processing tasks creation failed (ret = -2147483648)
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2CameraHw: Unable to configure stream for imgunit
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RequestThread: Error configuring the streams @handleConfigureStreams:213
03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RequestThread:     error -2147483648 in handling message: 3
03-01 02:40:30.071   349   349 E Camera3-Device: Camera 1: configureStreamsLocked: Set of requested inputs/outputs not supported by HAL
03-01 02:40:30.071   349   349 E CameraDeviceClient: endConfigure: Camera 1: Unsupported set of inputs/outputs provided
03-01 02:40:30.071  1699  1741 W CameraDevice-JV-1: Stream configuration failed due to: endConfigure:505: Camera 1: Unsupported set of inputs/outputs provided
03-01 02:40:30.072  1699  1741 E CameraCaptureSession: Session 0: Failed to create capture session; configuration failed
03-01 02:40:30.072  1699  1817 E CAM_CaptureModule: Could not set up preview.
03-01 02:40:30.079  1699  1699 D CAM_LoggingImageReader: Closing: ImageReader{width=3264, height=2448, format=JPEG}
03-01 02:40:30.081   349   349 I Camera3-Device: disconnectImpl: E
03-01 02:40:30.088   349   349 I Camera3-Device: disconnectImpl: X
03-01 02:40:30.094   349   349 I CameraService: disconnect: Disconnected client for camera 1 for PID 1699

其中：

 03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfig: @selectSensorOutputFormat : App stream size(3264x2448) larger than Sensor full size(2592x1944), Check camera3_profiles.xml

提示分辨率不支持，

于是打开camera3_profiles.xml，将所有3264x2448修改为2592x1944

    <jpeg.maxSize value="5038848"/>  <!-- 3264*2448*1.5  2592x1944*1.5= 5038848   -->
	<sensor.info.activeArraySize value="0,0,2592,1944"/> 
	<sensor.info.pixelArraySize value="2592x1944"/> 
	<supportTuningSize value="2592x1944"/>

将下面几个属性所有关3264x2448的全部删除

<scaler.availableStreamConfigurations value="BLOB,3264x2448,OUTPUT,
<scaler.availableMinFrameDurations value=
<scaler.availableStallDurations value="

2592*1944*1.5= 5038848

八、其他问题

1. 前置摄像头旋转了180°

修改xml文件

  <sensor.orientation value="90"/>

2. 闪光灯

 <flash.info.available value="TRUE"/>