IMX6QP + Sony IMX290 CMOS via MIPI

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IMX6QP + Sony IMX290 CMOS via MIPI

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joanvicient
Contributor II

We have an own IMX6QP board communicating with an own CMOS sensor board (Sony IMX290 based) via MIPI interface. We developed a camera driver and also modified some of the NXP BSP files and more or less the solution is working, but we are experiencing a strange behavior apparently related with the vertical sync which we are not able to solve.

Camera streams data correctly (all MIPI_CSI registers indicate correct value) but we are not receiving the start of frame at the correct position.

For debugging purposes, the camera is sending a pattern, fixing all pixels of a cocnrete row to 0x3FF (all FFs with 10 bits) but we never found this pattern at the indicated row but in other rows, changing with each frame It has some kind of  “repetitive” behavior

Some particularities:

  • Camera is working in 10 bits mode. It means, each 4 pixels are encoded with 5 bytes according the MIPI

  • Camera is working at 1920x1080

  • Camera uses 4 MIPI lanes working at 222.75Mbps/lane

  • Horizontal sync seems to be working correctly

  • Framerate 1fps (adjusted in sensor with some registers: FRSEL which fixes 1H time to 29.6us and VMAX which fixes the number of lines). Same issue happens at higher framerates.

  • Patches applied against NXP last kernel:

  • Our capture test software is based on standard https://linuxtv.org/downloads/v4l-dvb-apis/uapi/v4l/capture.c.html adapted to our image formats.

Some “suspects”:

  • It seems there is some relation between the vsync issue and the sensor register WINWV_OB (who fixes the vertical Out Band region of the image). Modifying this register has direct influence on row displacement.

  • Some frames are “lost”. In the example sent we are capturing 7 frames, but receiving 11 end-of-frame interrupts. Some of them seems are not “arriving” to our DQUEUE

Attached a video showing the effect.

Any ideas of what can be happening?

Thanks for the feedback!

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weidong_sun
NXP TechSupport
NXP TechSupport

Hi Joan,

   Below is the reply from i.MX Expert team.

-------------------

For 1920*1080 RAW10 input, it is total 2400*1080 bytes.

To received it as 16bpp generic mode, width = 1200 and height = 1080.

--------------------

Have a nice day!

BR,

Weidong

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weidong_sun
NXP TechSupport
NXP TechSupport

Hi Joan,

   See below, please!

------------------------------------------------

The MIPI CSI2 RAW10 data is mapped as followed, so iMX6 CSI should use 16bits generic mode to capture it, the customer should calculate the frame size for IDMAC, if the IDMAC size is not same as real frame data size, scroll issue like the video will happen.

01.png

By the way, iMX6 has no hardware ISP to process the RAW video.

Hope above information is helpful for you!

Have a nice day!

BR,

weidong

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joanvicient
Contributor II

Hi,

Thanks for your reply. Just to verify if I understand your comments, I specify my scenario in order to cross check register values: Assuming camera is sending a 1920x1080 image 10 bpp (this is 1920x1080x(5/4) bytes), which would be the correct configuration of the following registers?

  • IPU0_CSI0_SENS_CONF: Specially CSI0_DATA_WIDTH & CSI0_SENS_PRTCL
  • IPU0_CSI0_SENS_FRM_SIZE
  • IPU0_CSI0_ACT_FRM_SIZE

And what about CPMEM?

  • BPP 
  • FW (Frame width)
  • FH (Frame height)
  • SL (Stride Line)
  • PFS

Thanks for you help!

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weidong_sun
NXP TechSupport
NXP TechSupport

Hi Joan,

   Below is the reply from i.MX Expert team.

-------------------

For 1920*1080 RAW10 input, it is total 2400*1080 bytes.

To received it as 16bpp generic mode, width = 1200 and height = 1080.

--------------------

Have a nice day!

BR,

Weidong

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joanvicient
Contributor II

Thanks Wigros,

Your indications served to solve the issue!

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nesterovich2797
Contributor I

Dear, joan vicient. Did you manage to start the camera?

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