[参考译文] AM625：可以&&#39；在多摄像头应用中从第二个摄像头获取视频流

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1518847/am625-can-t-get-a-stream-from-my-second-camera-in-multiple-camera-application

工具/软件：

大家好：

我正在设计在 AM625上运行双摄像头的设置。 我有两个摄像头：一个 ISX021和一个 OV2311、通过 MAX96716/MAX96717串行器/解串器对连接。 以下是我的`mΔ i edia-ctl -p`命令的输出：

root@myd-am62x:~# media-ctl -p
Media controller API version 6.1.46

Media device information
------------------------
driver          j721e-csi2rx
model           TI-CSI2RX
serial          
bus info        platform:30102000.ticsi2rx
hw revision     0x1
driver version  6.1.46

Device topology
- entity 1: 30102000.ticsi2rx (5 pads, 5 links, 2 routes)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
	routes:
		0/0 -> 1/0 [ACTIVE]
		0/1 -> 2/0 [ACTIVE]
	pad0: Sink
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		[stream:1 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb]
		<- "cdns_csi2rx.30101000.csi-bridge":1 [ENABLED,IMMUTABLE]
	pad1: Source
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		-> "30102000.ticsi2rx context 0":0 [ENABLED,IMMUTABLE]
	pad2: Source
		[stream:0 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb]
		-> "30102000.ticsi2rx context 1":0 [ENABLED,IMMUTABLE]
	pad3: Source
		-> "30102000.ticsi2rx context 2":0 [ENABLED,IMMUTABLE]
	pad4: Source
		-> "30102000.ticsi2rx context 3":0 [ENABLED,IMMUTABLE]

- entity 7: cdns_csi2rx.30101000.csi-bridge (5 pads, 2 links, 2 routes)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
	routes:
		0/0 -> 1/0 [ACTIVE]
		0/1 -> 1/1 [ACTIVE]
	pad0: Sink
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		[stream:1 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb]
		<- "max96716 1-004c":2 [ENABLED,IMMUTABLE]
	pad1: Source
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		[stream:1 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb]
		-> "30102000.ticsi2rx":0 [ENABLED,IMMUTABLE]
	pad2: Source
	pad3: Source
	pad4: Source

- entity 13: max96716 1-004c (4 pads, 3 links, 2 routes)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev2
	routes:
		0/0 -> 2/0 [ACTIVE]
		1/0 -> 2/1 [ACTIVE]
	pad0: Sink
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
		<- "max96717 1-0040":1 [ENABLED,IMMUTABLE]
	pad1: Sink
		[stream:0 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
		<- "max96717 1-0041":1 [ENABLED,IMMUTABLE]
	pad2: Source
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
		[stream:1 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
		-> "cdns_csi2rx.30101000.csi-bridge":0 [ENABLED,IMMUTABLE]
	pad3: Source

- entity 20: max96717 1-0040 (2 pads, 2 links, 1 route)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev3
	routes:
		0/0 -> 1/0 [ACTIVE]
	pad0: Sink
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		<- "ov2311_mipi 1-0010":0 [ENABLED,IMMUTABLE]
	pad1: Source
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		-> "max96716 1-004c":0 [ENABLED,IMMUTABLE]

- entity 25: max96717 1-0041 (2 pads, 2 links, 1 route)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev4
	routes:
		0/0 -> 1/0 [ACTIVE]
	pad0: Sink
		[stream:0 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
		<- "isx021_mipi 1-001a":0 [ENABLED,IMMUTABLE]
	pad1: Source
		[stream:0 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
		-> "max96716 1-004c":1 [ENABLED,IMMUTABLE]

- entity 30: isx021_mipi 1-001a (1 pad, 1 link, 0 route)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev5
	pad0: Source
		[stream:0 fmt:UYVY8_1X16/1920x1280 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
		-> "max96717 1-0041":0 [ENABLED,IMMUTABLE]

- entity 34: ov2311_mipi 1-0010 (1 pad, 1 link, 0 route)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev6
	pad0: Source
		[stream:0 fmt:Y8_1X8/1280x800 field:none colorspace:srgb]
		-> "max96717 1-0040":0 [ENABLED,IMMUTABLE]

- entity 40: 30102000.ticsi2rx context 0 (1 pad, 1 link, 0 route)
             type Node subtype V4L flags 0
             device node name /dev/video0
	pad0: Sink
		<- "30102000.ticsi2rx":1 [ENABLED,IMMUTABLE]

- entity 46: 30102000.ticsi2rx context 1 (1 pad, 1 link, 0 route)
             type Node subtype V4L flags 0
             device node name /dev/video1
	pad0: Sink
		<- "30102000.ticsi2rx":2 [ENABLED,IMMUTABLE]

- entity 52: 30102000.ticsi2rx context 2 (1 pad, 1 link, 0 route)
             type Node subtype V4L flags 0
             device node name /dev/video2
	pad0: Sink
		<- "30102000.ticsi2rx":3 [ENABLED,IMMUTABLE]

- entity 58: 30102000.ticsi2rx context 3 (1 pad, 1 link, 0 route)
             type Node subtype V4L flags 0
             device node name /dev/video3
	pad0: Sink
		<- "30102000.ticsi2rx":4 [ENABLED,IMMUTABLE]

问题是我可以成功从连接到解串器端口 A 的 OV2311摄像头获得视频流：

root@myd-am62x:~# v4l2-ctl --device /dev/video0 --set-fmt-video=width=1280,height=800,pixelformat=GREY --stream-mmap
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 30.16 fps
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 30.16 fps
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 30.16 fps

但是、我无法从连接到端口 B 的 ISX021摄像头获得视频流：

root@myd-am62x:~# v4l2-ctl --device /dev/video1 --set-fmt-video=width=1920,height=1280,pixelformat=YUYV --stream-mmap
^C

我已`解串器的` video_lock `和` CSI1_PKT_CNT 寄存器指示解串器正在接收帧(数据包计数正在增加、存在视频锁定)。

我还使用 devmem2从 AM62x Sitara 处理器读取一些寄存器(请参考技术参考手册)、下面是流式传输期间的结果：

root@myd-am62x:~# devmem2 0x30101200 w
/dev/mem opened.
Memory mapped at address 0xffff7fb54000.
Read at address  0x30101200 (0xffff7fb54200): 0x00000000
root@myd-am62x:~# devmem2 0x30101204 w
/dev/mem opened.
Memory mapped at address 0xffff84515000.
Read at address  0x30101204 (0xffff84515204): 0x80000011
root@myd-am62x:~# devmem2 0x30101208 w
/dev/mem opened.
Memory mapped at address 0xffffa3135000.
Read at address  0x30101208 (0xffffa3135208): 0x00000000
root@myd-am62x:~# devmem2 0x3010120C w
/dev/mem opened.
Memory mapped at address 0xffffb37f0000.
Read at address  0x3010120C (0xffffb37f020c): 0x00000100
root@myd-am62x:~# devmem2 0x30101210 w
/dev/mem opened.
Memory mapped at address 0xffffa0f4d000.
Read at address  0x30101210 (0xffffa0f4d210): 0x00000000
root@myd-am62x:~# devmem2 0x30101214 w
/dev/mem opened.
Memory mapped at address 0xffff8a80c000.
Read at address  0x30101214 (0xffff8a80c214): 0x00000000
root@myd-am62x:~# devmem2 0x30101218 w
/dev/mem opened.
Memory mapped at address 0xffffb48c8000.
Read at address  0x30101218 (0xffffb48c8218): 0x00000000
root@myd-am62x:~# devmem2 0x3010121C w
/dev/mem opened.
Memory mapped at address 0xffffaba8b000.
Read at address  0x3010121C (0xffffaba8b21c): 0x00000000
root@myd-am62x:~# devmem2 0x30101220 w
/dev/mem opened.
Memory mapped at address 0xffffa9962000.
Read at address  0x30101220 (0xffffa9962220): 0x00000000
root@myd-am62x:~# devmem2 0x30101224 w
/dev/mem opened.
Memory mapped at address 0xffff98c28000.
Read at address  0x30101224 (0xffff98c28224): 0x00000000
root@myd-am62x:~# devmem2 0x30101228 w
/dev/mem opened.
Memory mapped at address 0xffffad587000.
Read at address  0x30101228 (0xffffad587228): 0x00000000

我目前被困在这个问题上、希望就我应该检查或尝试启用 AM625上两个摄像头的流式传输的其他内容提供任何指导。

提前感谢！