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Subject[PATCH v4 00/13] drm/sun4i: Support the Display Engine frontend

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,

Changes from v3:
- Added some TODO notes for the ALPHA_EN and pipelines bits
- Reset the frontend in the runtime_resume callback instead of probe

Changes from v2:
- Substracted PHYS_OFFSET to the buffer address
- Make sure we only probe and add to the component list on frontends that
are supported, and not simply the one enabled in the DTs
- Reset the device at probe, and deassert the line after the clocks are
- Fixed the format value used
- Used drm_fb_cma_get_gem_addr
- Added a define for the COEF_ACCESS_CTRL bit
- Fixed a wrong comment
- Kept the ordering of the engine ops
- Reapplied the NULL plane pointer patch that got squashed in v2 somehow
- s/backend/engine/ in the engine_ops documentation

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 (13):
drm/sun4i: backend: Move line stride setup to buffer setup function
drm/sun4i: backend: Document the engine operations
drm/sun4i: backend: Allow a NULL plane pointer to retrieve the format
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 | 184 ++++++++++-
drivers/gpu/drm/sun4i/sun4i_backend.h | 10 +-
drivers/gpu/drm/sun4i/sun4i_crtc.c | 21 +-
drivers/gpu/drm/sun4i/sun4i_drv.c | 27 +-
drivers/gpu/drm/sun4i/sun4i_drv.h | 1 +-
drivers/gpu/drm/sun4i/sun4i_framebuffer.c | 6 +-
drivers/gpu/drm/sun4i/sun4i_frontend.c | 389 +++++++++++++++++++++++-
drivers/gpu/drm/sun4i/sun4i_frontend.h | 99 ++++++-
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 | 89 +++++-
14 files changed, 907 insertions(+), 21 deletions(-)
create mode 100644 drivers/gpu/drm/sun4i/sun4i_frontend.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_frontend.h

base-commit: f2e323798ce2553a10ddc720879553642e05e619
git-series 0.9.1

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