drm/fbdev: Clean up fbdev documentation

Rewrite some docs that are not up-to-date any longer. Remove the TODO
item for fbdev-generic conversion, as the helper has been replaced. Make
documentation for DMA, SHMEM and TTM emulation available.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-44-tzimmermann@suse.de

Documentation/gpu/drm-kms-helpers.rst

@@ -110,15 +110,21 @@ fbdev Helper Functions Reference
 .. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
    :doc: fbdev helpers
 
+.. kernel-doc:: drivers/gpu/drm/drm_fbdev_dma.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_fbdev_shmem.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_fbdev_ttm.c
+   :export:
+
 .. kernel-doc:: include/drm/drm_fb_helper.h
    :internal:
 
 .. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
    :export:
 
-.. kernel-doc:: drivers/gpu/drm/drm_fbdev_ttm.c
-   :export:
-
 format Helper Functions Reference
 =================================
 

Documentation/gpu/todo.rst

@@ -243,19 +243,6 @@ Contact: Maintainer of the driver you plan to convert
 
 Level: Intermediate
 
-Convert drivers to use drm_fbdev_generic_setup()
-------------------------------------------------
-
-Most drivers can use drm_fbdev_generic_setup(). Driver have to implement
-atomic modesetting and GEM vmap support. Historically, generic fbdev emulation
-expected the framebuffer in system memory or system-like memory. By employing
-struct iosys_map, drivers with frambuffers in I/O memory can be supported
-as well.
-
-Contact: Maintainer of the driver you plan to convert
-
-Level: Intermediate
-
 Reimplement functions in drm_fbdev_fb_ops without fbdev
 -------------------------------------------------------