drm: Add TODO item for fbdev driver conversion

The DRM TODO list now contains an entry for converting fbdev
drivers over to DRM.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191017074705.9140-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2019-10-17 09:47:05 +02:00
parent f86cf71944
commit 3c2ed9cedd

View File

@ -462,3 +462,30 @@ Contact: Sam Ravnborg
Outside DRM
===========
Convert fbdev drivers to DRM
----------------------------
There are plenty of fbdev drivers for older hardware. Some hwardware has
become obsolete, but some still provides good(-enough) framebuffers. The
drivers that are still useful should be converted to DRM and afterwards
removed from fbdev.
Very simple fbdev drivers can best be converted by starting with a new
DRM driver. Simple KMS helpers and SHMEM should be able to handle any
existing hardware. The new driver's call-back functions are filled from
existing fbdev code.
More complex fbdev drivers can be refactored step-by-step into a DRM
driver with the help of the DRM fbconv helpers. [1] These helpers provide
the transition layer between the DRM core infrastructure and the fbdev
driver interface. Create a new DRM driver on top of the fbconv helpers,
copy over the fbdev driver, and hook it up to the DRM code. Examples for
several fbdev drivers are available at [1] and a tutorial of this process
available at [2]. The result is a primitive DRM driver that can run X11
and Weston.
- [1] https://gitlab.freedesktop.org/tzimmermann/linux/tree/fbconv
- [2] https://gitlab.freedesktop.org/tzimmermann/linux/blob/fbconv/drivers/gpu/drm/drm_fbconv_helper.c
Contact: Thomas Zimmermann <tzimmermann@suse.de>