[driver] frame start syncpt timeout

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

hello everybody:

Our TX1 capture TC358840 video Signal, when the plug->unplug->plug the HDMI signal line, will continue to print “frame start syncpt timeout”, can not return to normal.

Only restart video capture process to restore normal.

In vi2_fops.c in the kernel, tegra_channel_ec_recover(Chan) is invoked after a timeout error, why does the video capture not return to normal?

Please take a look at it for me.thank you.

2

You may need have the APP to catch the interrupt of the TC358840 to stop capture if HDMI is unplug.

3

Thank you for your reply.
Can I read the timeout state of VI through the V4L2 interface?

4

Not implement this but you can implement it by yourself.

5

hi,ShaneCCC:

I have a few questions about implement v4l2 control.

1, if I want to control the VI2 device, I need to open which device file, is/dev/videoX,/dev/nvhost-vi, or other device files

2, I want to test the APP passes a parameter to VI via ‘ioctl’, such as ‘V4L2_CID_VI_BYPASS_MODE’ in channel.c, when I make headers_install for the kernel, the header file of the command(camera_common.h) is not copied. Is this command only used within the kernel and cannot be supplied to the APP ?

6
  1. it could be /dev/media0 or /dev/v4l2-subdevx
  2. For the bypass_mode you can reference to the v4l2-ctl source code to know how to set it. (v4l2-ctl --set-ctrl bypass_mode=0)