I have been going at this for several months now. I am still quite new to the field, self-taught, and I am learning this as I go. I am trying to come up with a design where a MIPI DSI display is driven by the Sunplus/Tibbo SP7021 SiP (System in Package) that has an HDMI and parallel RGB output. The display being used is the Tailorpixels TOH323XVT-01C
https://tailorpixels.com/product/3-23-inch-bar-amoled-with-on-cell-touch-262x928-mipi/ that has a resolution of 928x262 and appears to have a single lane MIPI DSI interface.
Options, available to individuals, for converting RGB to MIPI DSI are very limited from my experience. I contacted Toshiba about getting more information about the TC358778XBG RGB-MIPI bridge IC months ago but I never got a response. I have seen some options from Solomon Systech and Analogix, though sourcing such components at such a small scale does not seem to be possible. I recently came across the Rockchip RK628 series where the RK628F and RK628D are available on LCSC as of writing, though like other Rockchip ICs, documentation is limited.
Another option I explored is to use an FPGA though the only MIPI DSI transmitter IP I could find was this from GitHub:
https://github.com/skatanik/dsi_controller.
The third option I thought of was to use an STM32 microcontroller with a MIPI DSI transmitter like the STM32F469AE that would be dedicated to driving the display. This may be the most complex option where I may have to consider external SDRAM, DMA and communication between the SP7021 and the STM32.