i.MX8MP MIPI CSI2 ISI ISP test driver.

[rod_pec]

We have a camera with 1696x200 resolution set to 2-lane MIPI at 360 MHz (measured on oscilloscope). Our DT is configured with those options:

max-pixel-frequency = /bits/ 64 <720000000>;

data-lanes = <1 2>

csis-hs-settle = <15>;

isi_0 = disabled

isp_0 = okay
Everything register is configured properly, as we see the LP transition and MIPI data flow.
The custom driver was based on the IMX662 and we expect a RAW12 output from it.
After bring-up of drivers using start_isp, we run video_test:

ISP_LOG_LEVEL=8 ./video_test -w 1696 -h 200 -f RAW12 -t file -d 2 -m

0
The log shows the buffer description but no data is received

Questions:

How can we assess MIPI is receiving anything?

[rod_pec]

We were make to test with our setup sensor and IMX8MP, we have this: 

The camera sensor does not say anything about continuous or non-continuous clock in documentation files. We see with the oscilloscope a moment between frames where data and clock are high. Would that be non-continuous?
Tried setting clock-noncontinuouson our overlay and the only change was that SOT Errors did not increment (everything 0).
According to our driver implementation, the LP transitions are happening on the stream_on function call. Would that be the correct place? Maybe some kind of delay is necessary? 

[joanxie]

what clock mode do you use? and pls share the boot up logfile and dump the mipi csi registers, let me double check it

[rod_pec]

HI.

Our sensor cam has a continuous clock mode. 

Attached you will see the boot up log and a mipi csi dump. 

Please let me know if you need any other information or reg status. 

[joanxie]

how about setting the camera as non-continuous mode to test again? refer to your print log, SOT error shows the timing issue,  the camera must enter LP mode before mipi dphy enable, the continuous mode make the clock enter HS mode always, so the timing will couldn't meet the request, so pls change the clock mode and test again

[rod_pec]

We were make to test with our setup sensor and IMX8MP, we have this: 

The camera sensor does not say anything about continuous or non-continuous clock in documentation files. We see with the oscilloscope a moment between frames where data and clock are high. Would that be non-continuous?
Tried setting clock-noncontinuouson our overlay and the only change was that SOT Errors did not increment (everything 0).
According to our driver implementation, the LP transitions are happening on the stream_on function call. Would that be the correct place? Maybe some kind of delay is necessary? 

[joanxie]

when you set clock-noncontinuouson, the SOT error fix, but still couldn't capture, right? if you set noncontinous clock mode, pls check bit  STOPSTATECLK of MIPI_CSIx_DPHY_STATUS, it must alter between 0 and 1; is it correct? or you can set this register to me, let me check if the dphy works correctly or not

[rod_pec]

I ran some tests with a sensor had already kernel driver and my sensor under development. So I used this commands to try some debug logs using dmesg in terminal:

$ sudo echo 2 > /sys/module/imx8_mipi_csi2_sam/parameters/debug

$ sudo echo 'file v4l2-fwnode.c +p' > /sys/kernel/debug/dynamic_debug/control

I observed in logs that the bit STOPSTATECLK in MIPI_CSIx_DPHY_STATUS resgister stey always in 1 when I load the driver and start the tests app as showed in print. The value is always C1 and nothing is captured.
Do you know other method to monitoring dynamically the register of interest (devmem maybe)?

My sensor

Reference sensor. 

[joanxie]

if STOPSTATECLK  alwayas 1, you need confirm if your camera side set correct or not, could you get the signal from camera side or not, then ensure camera enter LP before enable the mipi dphy