Re: RGB LCD panel with sunxi_drm

On Sun, Aug 25, 2024 at 10:04:26AM +0800, Rui-Xiang Guo wrote:
> Hi,
> "simple-panel" and "display-timings" definitions are added into the dts file,
> but get the error from dmesg on 10.0:
> [   1.0000040] sunxidrm0: [drm] Cannot find any crtc or sizes
> [   1.0000040] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [   1.0000040] [drm] No driver support for vblank timestamp query.
> [   1.0000040] [drm] Initialized sunxi 1.0.0 20190123 for sunxidrm0 on minor 0
> [   1.0000040] sunxidrm0: initialized sunxi 1.0.0 20190123 on minor 0
> 
> I note that get_modes function is NULL in fdt_panel.c.
> Is it possiable to implement it in these cases without EDID detection,
> like panel-simple.c on Linux?

I made it work on the LicheePi Zero with LCD 800x480 and I thought it was
also compatible with LCD 480x272.

Here is the dmesg -
https://github.com/picohive/netbsd-licheepi-zero/blob/main/boot.log

You might need to use wip/u-boot-licheepi-zero for the initial test.
However, it could run standalone without u-boot DE2 enable first.

-rxg