Hi Thomas,
Thomas Zimmermann tzimmermann@suse.de writes:
Am 01.11.21 um 09:54 schrieb Sven Schnelle:
Thomas Zimmermann tzimmermann@suse.de writes: Thanks, i wasn't aware as i normally don't do any graphics related development. I take a look at dri and port the driver, which is hopefully not too hard.
Sounds good.
The one big difference when converting is that DRM really wants drivers to support 32-bit XRGB colors. It's not a DRM limitation per se, but a requirement of today's userspace programs. AFAICS your fbdev driver uses a 256-color palette format. So the DRM driver would have to convert XRGB8888 to 8-bit RGB332 and install a corresponding palette.
Right now the driver only supports 8 bit pseudocolor, because i wanted to start with something easy to get the kernel fbcon running. I have no idea (yet) how to switch the card into other color formats. And neither how to do pseudo color with drm. But i'll figure it out i guess.
Don't worry, it's easy. Take a look at the cirrus driver for a simple DRM driver. [1]
Great, i also picked that driver as a template. :-)
Thanks for your help and pointers, much appreciated!
Sven