ICN6211 & TFT display hacking debugging

yesterday we had the square 4" 720x720 TFT display (https://www.adafruit.com/product/5794) working with our Raspberry Pi DTO + ICN6211 configuration. now we want to move onto a round screen. one thing that was kinda nice about that screen is it does not require an SPI init code - it pops up immediately into RGB TTL mode. all our other screens require configuration. which means now we have a lot of variables: the DTO and kernel driver that writes DSI data, the ICN6211 configuration that sets the TTL resolution and sync, and the SPI config. that's a lot of variables! we're going to back up and just make sure the SPI init is good - to do that we use the ST7701 datasheet to find the 'all pixels on' command. by sending this at the end of the init string and seeing all white display we know that at least that part of the configuration is working, then we can work back and get the ICN6211 test colorbars and finally work all the way back to the DTO setting. display work is really hard but this is something we've done many many times so we are used to juggling so many configs. what really helps a ton is having a known good setup using the ESP32-S3 Qualia (https://www.adafruit.com/product/5800), so we are really glad we got that working first
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