What is the Maximum MIPI CSI2 bandwidth for 4 lanes ?

[titusstalin]

Hello Experts,

I would like to know the maximum achievable MIPI-CSI2 bandwidth with 4 lanes configuration for imx6 quad processor ?

I'm using 4 lanes MIPI configuration and able to achieve up to 750Mbps per lane, but imx6 guide mentioned 800Mbps per lane.

IMX6DQRM.pdf, page no 450.

One MIPI/CSI-2 port- IPU receives two components per cycle from the MIPI_CSI2
interface. The maximum bandwidth of the interface is as follows:
• 400MByte/sec for four data lanes configuration (800Mbps/lane)
• 375MByte/sec for 3 data lanes configuration (1000Mbps/lane)
• 250MByte/sec for 2 data lanes configuration (1000Mbps/lane)
• 125Mbyte/sec for 1 data lanes configuration (1000Mbps/lane)

So what is practically achievable MIPI-CSI2 bandwidth for 4 lanes ?

Thanks for your support.

[joanxie]

on theory, mx6q mipi csi can support up to 800Mbps/lane, I don't know your detailed case, maybe you can check your clock and register settings, I send the mipi debug file to you for reference.

[titusstalin]

Thanks Joan for your support.

Yes I have configured the clock correctly as per the attached (in your post) doc.

I could see the corruption in the image when I stream at 800Mbps.

What could be the problem ?

Any custom had tried with this configuration and able to achieve 800Mbps for 4 lanes configuration ?

Can you please check with dev team on this ?

Its kind of urgent for us. Could you please support us ?

PS: More over I'm able to stream the MIPI data 100Mbps/lane for 1 to 3 lanes, able to achieve total 3Gbps in 3lanes config. (as mentioned in RM)

Also getting total 3Gbps for 4 lanes config.

Thanks.

[joanxie]

yes, can support 800M/lane,  what resolutio,frame rate and data format you use? could you offer more detailed information, any error message or something?

[titusstalin]

I am using 800x600 RGB888 @10FPS

BTW, I didn't get any error message but it gives the corrupted image if I increase the BW to 760Mbps.

[joanxie]

mx6q mipi can support this, if you have corrupted image, you should check your clock or other settings of mipi, I send the mipi debug to you, you check if you set mipi correct or not.

[titusstalin]

Hi Joan,

Sorry for the delayed response on this as I am stuck with other major issues.

Now we are able to acheive data rate upto 790Mbps per lane in 4 lane configuration but TRM says that it does support upto 800Mbps/lane.

I have used all the clock values mentioned in "Debug steps for customer MIPI sensor.docx" document and still getting some distortion in picture.

Can you please help me on this ?