How do I verify that the Video node "/dev/video0" has data?

Hi,
I have a problem debugging the camera driver on Jetson Xavier,Could you give me some advice on how to solve these problems?

How do I verify that the Video node “/dev/video0” has data?
some information:
1.There is a device node “/dev/video0”,use “imx185.c” as a reference;
2.Mipi signal is measured by an oscilloscope as shown in the figure below (the oscilloscope frequency is not enough);
3.The Log for debugging is shown below(have “ rtos_queue_peek_from_isr_failed: tstamp:20031741311 queue:0x0bcbcf78” error)

====

root@nvidia-desktop:/home/nvidia# cat /sys/kernel/debug/tracing/trace

tracer: nop

entries-in-buffer/entries-written: 52/52 #P:4

_-----=> irqs-off

/ _----=> need-resched

| / _—=> hardirq/softirq

|| / _–=> preempt-depth

||| / delay

TASK-PID CPU# |||| TIMESTAMP FUNCTION

| | | |||| | |

 kworker/0:2-12907 [000] ....   629.300713: rtos_queue_peek_from_isr_failed: tstamp:20031741311 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   629.468677: rtos_queue_peek_from_isr_failed: tstamp:20036741311 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   629.636662: rtos_queue_peek_from_isr_failed: tstamp:20041741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   629.804626: rtos_queue_peek_from_isr_failed: tstamp:20046741317 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   629.916602: rtos_queue_peek_from_isr_failed: tstamp:20051741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   630.084588: rtos_queue_peek_from_isr_failed: tstamp:20056741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   630.252575: rtos_queue_peek_from_isr_failed: tstamp:20061741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   630.420548: rtos_queue_peek_from_isr_failed: tstamp:20066741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   630.760503: rtos_queue_peek_from_isr_failed: tstamp:20076741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   630.872485: rtos_queue_peek_from_isr_failed: tstamp:20081741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.040474: rtos_queue_peek_from_isr_failed: tstamp:20086741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.208448: rtos_queue_peek_from_isr_failed: tstamp:20091741316 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.376423: rtos_queue_peek_from_isr_failed: tstamp:20096741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.544417: rtos_queue_peek_from_isr_failed: tstamp:20101741320 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.712391: rtos_queue_peek_from_isr_failed: tstamp:20106741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.880387: rtos_queue_peek_from_isr_failed: tstamp:20111741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   631.992341: rtos_queue_peek_from_isr_failed: tstamp:20116741312 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   632.160309: rtos_queue_peek_from_isr_failed: tstamp:20121741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   632.328297: rtos_queue_peek_from_isr_failed: tstamp:20126741308 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   632.496286: rtos_queue_peek_from_isr_failed: tstamp:20131741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   632.664251: rtos_queue_peek_from_isr_failed: tstamp:20136741312 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   632.832248: rtos_queue_peek_from_isr_failed: tstamp:20141741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.000241: rtos_queue_peek_from_isr_failed: tstamp:20146741317 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.112285: rtos_queue_peek_from_isr_failed: tstamp:20151741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.280273: rtos_queue_peek_from_isr_failed: tstamp:20156741308 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.448245: rtos_queue_peek_from_isr_failed: tstamp:20161741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.620218: rtos_queue_peek_from_isr_failed: tstamp:20166741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.788220: rtos_queue_peek_from_isr_failed: tstamp:20171741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   633.964144: rtos_queue_peek_from_isr_failed: tstamp:20176741308 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   634.076198: rtos_queue_peek_from_isr_failed: tstamp:20181741309 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   634.244152: rtos_queue_peek_from_isr_failed: tstamp:20186741312 queue:0x0bcbcf78
 kworker/0:2-12907 [000] ....   634.360201: rtos_queue_peek_from_isr_failed: tstamp:20189217128 queue:0x0bcbcf78
      cheese-20375 [000] ....   639.263136: tegra_channel_open: vi-output, imx185 8-003d
      cheese-20375 [000] ....   639.266460: tegra_channel_set_power: imx185 8-003d : 0x1
      cheese-20375 [000] ....   639.266481: camera_common_s_power: status : 0x1
      cheese-20375 [000] ....   639.267387: tegra_channel_set_power: 15a00000.nvcsi--2 : 0x1
      cheese-20375 [000] ....   639.267395: csi_s_power: enable : 0x1
      cheese-20375 [000] ....   639.269307: tegra_channel_close: vi-output, imx185 8-003d
      cheese-20375 [000] ....   639.269318: tegra_channel_set_power: imx185 8-003d : 0x0
      cheese-20375 [000] ....   639.269327: camera_common_s_power: status : 0x0
      cheese-20375 [000] ....   639.269513: tegra_channel_set_power: 15a00000.nvcsi--2 : 0x0
      cheese-20375 [000] ....   639.269516: csi_s_power: enable : 0x0
      cheese-20390 [001] ....   639.275202: tegra_channel_open: vi-output, imx185 8-003d
      cheese-20390 [001] ....   639.275230: tegra_channel_set_power: imx185 8-003d : 0x1
      cheese-20390 [001] ....   639.275242: camera_common_s_power: status : 0x1
      cheese-20390 [001] ....   639.275887: tegra_channel_set_power: 15a00000.nvcsi--2 : 0x1
      cheese-20390 [001] ....   639.275894: csi_s_power: enable : 0x1
      cheese-20390 [001] ....   639.276350: tegra_channel_close: vi-output, imx185 8-003d
      cheese-20390 [001] ....   639.276357: tegra_channel_set_power: imx185 8-003d : 0x0
      cheese-20390 [001] ....   639.276362: camera_common_s_power: status : 0x0
      cheese-20390 [001] ....   639.276539: tegra_channel_set_power: 15a00000.nvcsi--2 : 0x0
      cheese-20390 [001] ....   639.276542: csi_s_power: enable : 0x0

====

hello actiondo,

looks like there’s high speed data by oscilloscope,
please also check documentation, for sample commands to access camera for streaming, Approaches for Validating and Testing the V4L2 Driver.
you should start from using V4L2 standard controls to verify basic functionality during sensor bringup.
thanks