Hi,
This is a first serie to enable the display engine frontend.
This hardware block is found in the first generation Display Engine from Allwinner. Its role is to implement more advanced features that the associated backend, even though the backend alone can be used (and was used so far) for basic composition.
Among those features, we will find hardware scaling, that is supported in this serie, colorspace conversions, or more exotic formats support such as the one output by the VPU.
Let me know what you think, Maxime
Changes from v1: - Fixed the unbind function to not disable the already disabled clocks, and to remove ourself from the frontend list - Changed the log level of the frontend disabled message - Added blank lines where suggested by Neil - Fixed an artifact that was happening when the plane using the frontend was disabled. This was happening because the frontend was disabled before the backend layer (that would be disabled at the next vblank). This led to a significant rework of the patches, so I didn't apply all the tags. I also had to take a few patches in. - Added engine ops documentation - Fixed a bug in our duplicate_state callback that wouldn't preserve the frontend state - Removed the hardcoded register values and used the real ones instead. - Fixed some compilation errors reported by the 0-day bot.
Maxime Ripard (12): drm/sun4i: backend: Move line stride setup to buffer setup function sun4i/drm: backend: Document the engine operations drm/sun4i: backend: Add a custom plane state drm/sun4i: engine: Add a custom crtc atomic_check drm/sun4i: engine: Add a VBLANK quirk callback drm/sun4i: engine: Create an atomic_begin callback drm/sun4i: Add a driver for the display frontend drm/sun4i: backend: Wire in the frontend drm/sun4i: backend: Add a custom atomic_check for the frontend drm/sun4i: backend: Use runtime_pm variant of atomic_commit_tail drm/sun4i: backend: Make sure we don't have a commit pending ARM: dts: sun8i: a33 Enable our display frontend
arch/arm/boot/dts/sun8i-a33.dtsi | 1 +- drivers/gpu/drm/sun4i/Makefile | 3 +- drivers/gpu/drm/sun4i/sun4i_backend.c | 183 ++++++++++- drivers/gpu/drm/sun4i/sun4i_backend.h | 10 +- drivers/gpu/drm/sun4i/sun4i_crtc.c | 21 +- drivers/gpu/drm/sun4i/sun4i_drv.c | 16 +- drivers/gpu/drm/sun4i/sun4i_drv.h | 1 +- drivers/gpu/drm/sun4i/sun4i_framebuffer.c | 6 +- drivers/gpu/drm/sun4i/sun4i_frontend.c | 392 +++++++++++++++++++++++- drivers/gpu/drm/sun4i/sun4i_frontend.h | 96 ++++++- drivers/gpu/drm/sun4i/sun4i_layer.c | 83 ++++- drivers/gpu/drm/sun4i/sun4i_layer.h | 11 +- drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 +- drivers/gpu/drm/sun4i/sunxi_engine.h | 93 ++++- 14 files changed, 897 insertions(+), 23 deletions(-) create mode 100644 drivers/gpu/drm/sun4i/sun4i_frontend.c create mode 100644 drivers/gpu/drm/sun4i/sun4i_frontend.h
base-commit: 4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323