Issue while streaming the YUV camera

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

I am porting Jetpack from version 4.6 (L4T 32.6.1) to 5.1.3 (L4T 35.5.0). The platform has an FPD-Link III connected to the Xavier NX platform.

Below is the streaming command:

v4l2-ctl -d /dev/video0 --set-fmt-video=width=1280,height=720 --stream-mmap

After inserting the camera driver using insmod, I can stream successfully. However, when I stop the streaming and start it again, it throws an uncorr_error. Below is the error log:

stream_error.txt (2.5 KB)

I have probed the MIPI data from the deserializer, and it appears to be working correctly. My main concern is about the platform board. I have boosted all the clocks and run the Jetson clock utility, but the issue still persists.

I am using a 6.4 Gbps MIPI output data rate from the deserializer.

Below is the mode.dtsi file for your reference:

mode.txt (3.0 KB)

Could you please help us resolve this issue?

3

hello Yugesh,

please refer to Topic 305007 to apply couple of kernel patches for verification.

4

Hi JerrChang,

I have applied the kernel patch from this Topic 305007

Whenever I stop the initial streaming and start it again, it throws an uncorr_error. Additionally, I cannot switch resolutions during the first streaming. The same error persists.

After this, I removed the driver using rmmod and reloaded it using insmod. I successfully started the initial streaming again, but stopping and restarting it results in the same uncorr_error. The issue remains consistent.

Below is the error log after applying the kernel patch:
second_time_stream_issue.txt (4.4 KB)

I did not observe any corr_err during this process.
Could there be an issue with the pix_clk_hz value?

Could you please assist us in resolving this issue?

5

hello Yugesh,

could you please issue a reset since it’s the camera streaming from SerDes chip.

6

Hi JerryChang,

I stopped the first-time streaming and started it again, it throws an uncorr_error. After resetting the SerDes, I was able to stream.

For subsequent attempts, if I start the stream within 5 seconds, it works fine. However, if I start the stream after 5 seconds, I need to reset the SerDes every time to get the stream.

Is it necessary to perform a full reset of the SerDes every time to get the stream?

7

hello Yugesh,

thanks for issue narrow down, it’s helpful information.


it’s camera firmware driver looking for camera initialization sequence (i.e. LP sequence), and it’s output data-rate to determine whether it needs to wait for skew calibration; it’ll enable pixel parser when deskew calibration has completed.
hence… it’s necessary for SerDes use-case.

9

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