With only a single display pipeline and primary plane, udl is perfect for simple-pipe helpers. Patches 1 to 3 do the convertion. This enables atomic modesetting for udl devices.
Patches 4 to 7 clean up handling of color depth and framebuffers. With universal planes that come with simple pipe, display updates can be implemented with DRM's damage handlers. The primary plane's formats array allows to export the correct preferred color depth. The original value was choosen for maximum compatibility, but did not represent the device's capability.
The patchset has been tested by running the fb console, X11 and Weston on a DisplayLink adapter.
Thomas Zimmermann (7): drm/udl: Init connector before encoder and CRTC drm/udl: Convert to struct drm_simple_display_pipe drm/udl: Remove unused encoder and CRTC code drm/udl: Set preferred color depth to 16 bpp drm/udl: Convert to drm_atomic_helper_dirtyfb() drm/udl: Remove struct udl_device.active_fb_16 drm/udl: Move udl_handle_damage() into udl_modeset.c
drivers/gpu/drm/udl/Makefile | 2 +- drivers/gpu/drm/udl/udl_connector.c | 19 +- drivers/gpu/drm/udl/udl_drv.c | 11 +- drivers/gpu/drm/udl/udl_drv.h | 19 +- drivers/gpu/drm/udl/udl_encoder.c | 70 ------- drivers/gpu/drm/udl/udl_fb.c | 216 ---------------------- drivers/gpu/drm/udl/udl_main.c | 3 - drivers/gpu/drm/udl/udl_modeset.c | 276 +++++++++++++++++----------- 8 files changed, 187 insertions(+), 429 deletions(-) delete mode 100644 drivers/gpu/drm/udl/udl_encoder.c delete mode 100644 drivers/gpu/drm/udl/udl_fb.c
-- 2.23.0