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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2019-10-17 09:47:05 +0200 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2019-10-17 12:21:12 +0200 |
| commit | 3c2ed9ceddf7c036c7cc6bab06fb7a555f8b137b (patch) | |
| tree | 5946e238cd15db181866b81034c12b92cfc0ed25 /Documentation | |
| parent | drm/i810: Refer to `PREEMPTION' in comment (diff) | |
| download | linux-3c2ed9ceddf7c036c7cc6bab06fb7a555f8b137b.tar.xz linux-3c2ed9ceddf7c036c7cc6bab06fb7a555f8b137b.zip | |
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
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/gpu/todo.rst | 27 |
1 files changed, 27 insertions, 0 deletions
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/drm_fbconv_helper.c + +Contact: Thomas Zimmermann <tzimmermann@suse.de> |