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Can panel-mipi-dbi work with a RAiO RA8889 TFT LCD Controller chip based display? #7

Open Bootpanic opened 9 months ago

Bootpanic commented 9 months ago

Hi,

Would it be possible to get a RAio RA8889 based display working with the panel-mipi-dbi driver? It is about the display that is in an EdgeLogix-RPI-1000 industrial controller. A friend and I have been trying to get the display working for weeks. The EdgeLogix-RPI-1000 is built around a Raspberry Pi compute module 4. The display is connected to the CM4 via SPI. The CM4 runs Raspberry Pi OS (Debian 11) with a 6.1.61 kernel. In the meantime we have tried with panel-mipi-dbi, fbtft and anyspi without success. I've added a link to a recent kernel log and a link to an English datasheet for the RA8889 at the bottom.

If you need more information or something we can test, please let us know.

Any help is welcome. Thank you in advance.

dmesg log: https://pastebin.com/kbk5YZVm RA8889 datasheet https://www.raio.com.tw/Data_raio/Datasheet/RA88%20Series/Completed/RA8889_DS_V13_Eng.pdf

Bootpanic commented 9 months ago

Just to inform you. I've started a discussion about this on the Raspberry Pi forum too. https://forums.raspberrypi.com/viewtopic.php?t=359667

notro commented 9 months ago

I don't think that controller is MIPI DBI compatible. From the datasheet it seems to be a register based interface compared to the command based on MIPI DBI. See wiki for a list of commands that can tell if a controller is MIPI compatible. At a minimum 0x2a, 0x2b and 0x2c is needed for uploading the framebuffer.