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HDMI influence on MIPI

Question asked by Pierre-Olivier Huard on Feb 23, 2018
Latest reply on Jul 20, 2018 by Pierre-Olivier Huard

Hello,

We found a really strange issue with a MIPI camera and HDMI.

Our MIPI camera works fine, is correctly configured and works with Gstreamer. But if we activate the HDMI ( by inserting the correct vidargs in u-boot : vidargs=video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24;video=mxcfb1:off fbmem=32M) the video "make a roll" when we restart Gstreamer.

 

This issue only happens when the HDMI is enabled in u-boot.

 

Another strange issue: when we disabled mxcfb* in the device tree:

&mxcfb1 { 
status = "disabled";
};
&mxcfb2 {
status = "disabled";
};
&mxcfb3 {
status = "disabled";
};
&mxcfb4 {
status = "disabled";
};

 

The MIPI does not work at all, the MIPI_CSI_PHY_STATE is constantly equals to 0x200

Any thoughts about this issue? Is it clock related?

We are working on iMX6Q POP package, the MIPI is running at 648MHz.

The image is build by Yocto Pyro, kernel is 4.1.15.

 

Regards,

Pierre-Olivier

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