The DRM TODO list now contains an entry for converting fbdev drivers over to DRM.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- Documentation/gpu/todo.rst | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 79785559d711..23b3a67794ba 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -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... + +Contact: Thomas Zimmermann tzimmermann@suse.de