When searching for the MIPI DSI specification PDF, ensure you are looking for the correct version. DSI-2 (based on M-PHY or C-PHY) supports 4.5 Gbps to 12 Gbps per lane, required for 4K at 120Hz and 8K displays. If you are designing for next-gen VR or AR headsets, DSI-2 is mandatory.
Many engineers focus only on High-Speed video transmission. However, the spec dedicates significant text to Escape Mode, used for LPDT (Low-Power Data Transmission). If your display initialization fails, you likely violated the timing for LP->HS transitions. mipi dsi specification pdf
If your company cannot afford the membership fee, you still have options for learning DSI: When searching for the MIPI DSI specification PDF