Messages in this thread | | | Date | Mon, 24 Jan 2022 20:05:29 +0100 | Subject | Re: [PATCH] MAINTAINERS: Add Helge as fbdev maintainer | From | Thomas Zimmermann <> |
| |
Hi
Am 24.01.22 um 19:38 schrieb Geert Uytterhoeven: > Hi Daniel, > > On Fri, Jan 21, 2022 at 9:55 AM Daniel Vetter <daniel@ffwll.ch> wrote: >> Just to clarify, since we had lots of smaller and bigger >> misunderstandings in the thread thus far: DRM_FORMAT_RGB332 exists, so >> drm support that already. The fbdev emulation doesn't yet, but all >> that's needed for that is filling out the code to remap the drm >> description to the fbdev format description for this case. Plus >> testing it all works ofc with fbcon and whatelse. Note that RGB332 is >> a bit more work than e.g. C4, since atm fbdev still uses only bpp to >> identify formats, so would need to be switch over to drm_fourcc first >> before adding anything which aliases with something existing (we have >> C8 already wired up). > > I doubt that RGB332 would be a bit more work than C4, as RGB332 is still > 8 bpp, while C4 is less. To support C4, all DRM code that cannot > handle format->cpp[0] < 1 or drm_format_info_block_width() > 1 has to be > fixed first. > > On the plus side, I finally got my proof-of-concept Atari DRM driver > working with fbcon on ARAnyM. Mapping /dev/fb0 from userspace doesn't > work (fbtest SEGVs while reading from the mapped frame buffer). I don't > know yet if this is a general issue without deferred I/O in v5.17-rc1, > or a bug in the m68k MM code... > > So far it supports C8 only, but I hope to tackle C4 and monochrome soon. > Whether the end result will be usable on real hardware is still to be > seen, but at least I hope to get some DRM code written...
That sounds pretty cool.
Best regards Thomas
> > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like that. > -- Linus Torvalds
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev [unhandled content-type:application/pgp-signature] | |