Trouble bridging HDMI to DSI using TC358870XBG

[tardiGrade98_]

Hello,

For a while now I have been attempting to drive a MIPI display using my own firmware. As far as I can tell, the setup for the screen is successful, it asserts OLED_EN, and communicates the correct EDID data to the source, and yet no images show on the DSI panel. All I get are the white horizontal lines you can see on the picture I attached. The screen came with a driver board and was working out of the box. But I need to replicate the factory Firmware. I sniffed the I2C packets between the MCU (STM32) and the Toshiba HDMI-MIPI bridge (TC358870XBG), from there I reconstructed the setup file for the TOS chip and the panel, but instead of showing bridged images from the HDMI source, I get the white horizontal lines. Has anyone been in my situation, or had similar issues with a MIPI panel before?

Display: https://www.aliexpress.com/i/4000192657266.html

Regards,

[vitalic66]

Have you ever been able to fix this?

I also need a special FW to drive a special display with other resolutions.

Regards

[dajanchar]

Hello,

I have ordered a round LCD display from china, where I have similar issue. The LCD and HDMI-MIPI board were ordered separately, which I presume is the issue because the LCD display is not working. HDMI link is detected OK (based on green LED), however only backlight of the LCD is enabled. I have also dumped I2C traffic and so far, everything looks OK regarding configuration itself. Basically the board configures HDMI-MIPI bridge to use both MIPI channels. 

If you want we can connect on some chat and discuss the issues further in more technical manner. I can provide my version of FW / I2C configuration so you can test it for yourself.