LCD panel drivers

[Wolfvak]

There needs to be a DRM driver for the panels to store their timings, resolution data and other specs.
Initialization is non-trivial as they also talk via I2C, and proper initialization of the panels calls for some register twiddling besides the regulator management.

We'll probably need a secondary way to debug the system, too.

[DesobedienteTecnologico]

Hi!

Is there any information about the LCD hardware, model, version?
I assume that the N3DS and N3DS XL have the same, right? Because the resolution is the same. No the display size.

[Wolfvak]

The LCD hw itself doesn't need to be accessed directly, as it is managed by a (more or less) uniform I2C device that remains close enough across all 3DS versions. https://problemkaputt.de/gbatek.htm#3dsi2clcdscreencontrollers

However, there's a lot of other info that's required by the PDC (PICA Display Controller, basically the CRTC) such as the timings, and the DRM subsystem really wants to know what the panel dimensions are.