[PATCH v4 00/11] drm: Add Allwinner A10 display engine support

From: Maxime Ripard
Date: Mon Apr 25 2016 - 09:29:29 EST

Hi everyone,

The Allwinner SoCs (except for the very latest ones) all share the
same set of controllers, loosely coupled together to form the display
pipeline.

Depending on the SoC, the number of instances of the controller will
change (2 instances of each in the A10, only one in the A13, for
example), and the output availables will change too (HDMI, composite,
VGA on the A20, none of them on the A13).

On most featured SoCs, it looks like that:

+--------------------------------------------+
| RAM |
+--------------------------------------------+
| | | |
v | | v
+----------------+ | | +----------------+
| Frontend | | | | Frontend |
+----------------+ | | +----------------+
| | | |
v | | v
+----------------+ | | +----------------+
| Backend |<+ +>| Backend |
+----------------+ +----------------+
| |
v v
+----------------+ +----------------+---> LVDS
| TCON | | TCON |---> RGB
+----------------+ +----------------+
| +---+ +---+ |
| | | |
v v v v
+------------+ +------------+ +------------+---> VGA
| TV Encoder | | HDMI | | TV Encoder |---> Composite
+------------+ +------------+ +------------+

The current code only assumes that there is a single instance of all
the controllers. It also supports only the RGB and Composite
interfaces.

Let me know what you think,
Maxime

Changes from v3:
- Fixed a circular dependency issue found when building as a module
- Changed a bit the mode_valid checks
- Fixed an issue with the timings generated by the display engine

- Changed the DT bindings according to Rob feedback (removed the
allwinner,panel property, documented the endpoints indices, always
use the frontend as the pipeline entrypoint)

- Changed the display clocks according to Stephen comments (marked
structures as const, changed a variable name)

Changes from v2:
- Rebased on top of next-20160318

- Dropped the generic clock regmap conversion and implemented a
custom clock for our pixel clock, backed by a regmap
- Added the reset bits for the tcon channel 0 and display clocks
- Used the new generic gates compatible for the DRAM gates
- Few clock fixes (missing iounmap, return error checks, etc)
- Found out that the TCON channel 1 clock was not operating properly
because of some weird rounding down and up between the various
generic clocks involved. Rewrote it using custom operations

- Removed some TODO that were still there
- Converted our panel DT description to the OF graph instead of a
custom property
- Tested the driver on a setup where U-Boot was not initialising the
display, or initialising it on a different output, and fixed a
number of associated bugs (mostly related to missing
initialisation bits, missing reset handles, and so on)
- Fixed the layer code that was assuming that the X and Y
coordinates were in pixels, leading to a miscalculation of the
buffer address when those coordinates where set.
- Added the missing EXPORT_SYMBOL calls

- Fixed our VBLANK interrupt code that was completely broken (and
not usable, which is why it was unnoticed)

Changes from v1:
- Rebased on top of 4.4

- Merged the clock drivers for the display and TCON channel 0 clocks
- Replaced the container_of calls in the display reset clocks to an
inline function
- Checked the return code of of_clk_parent_fill in the clocks
drivers
- Checked the return code of of_clk_add_provider in the tcon-ch1 and
PLL3 clocks
- Added missing clocks headers
- Created a composite clock unregister function

- Moved the binding documentation to
Documentation/devicetree/bindings/display
- Added the clocks binding documentation
- Added the Olimex vendor to the list of DT vendors
- Moved to the OF graph representation and the component framework

- Moved the reset cells count check into the reset framework to
avoid duplicating the code in every xlate implementation.
- Made the reset_ops const

- Reworked the DRM cmdline mode parsing code to allow named mode
- Fixed the TV mode lookup when the mode name is not present (for
example because it was given by the userspace)

- Made the driver outputs optional (to avoid crashing when a board
doesn't have either a panel or a composite output enabled)
- Added multiple plane support with transparency
- Moved the backend registers writes commit in the CRTC atomic_flush
callback
- Removed the load / unload functions
- Removed the enabled booleans in my private structure and removed
the implicit call to disable_unused_functions in the DRM core to
push it in the drivers.
- Fixed a few bitmasks on some bitfields definition
- Fixed the RGB connector mode validation that was not testing the
right values

Maxime Ripard (11):
clk: sunxi: Add display and TCON0 clocks driver
ARM: sun5i: a13: Add display and TCON clocks
drm: fb: Add seq_file definition
drm: sun4i: Add DT bindings documentation
drm: Add Allwinner A10 Display Engine support
drm: sun4i: Add RGB output
drm: sun4i: Add composite output
drm: sun4i: tv: Add PAL output standard
drm: sun4i: tv: Add NTSC output standard
ARM: sun5i: r8: Add display blocks to the DTSI
ARM: sun5i: chip: Enable the TV Encoder

Documentation/devicetree/bindings/clock/sunxi.txt | 2 +
.../bindings/display/sunxi/sun4i-drm.txt | 258 ++++++++
arch/arm/boot/dts/sun5i-a13.dtsi | 39 +-
arch/arm/boot/dts/sun5i-r8-chip.dts | 12 +
arch/arm/boot/dts/sun5i-r8.dtsi | 142 ++++-
drivers/clk/sunxi/Makefile | 1 +
drivers/clk/sunxi/clk-sun4i-display.c | 261 ++++++++
drivers/gpu/drm/Kconfig | 2 +
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/sun4i/Kconfig | 14 +
drivers/gpu/drm/sun4i/Makefile | 13 +
drivers/gpu/drm/sun4i/sun4i_backend.c | 364 +++++++++++
drivers/gpu/drm/sun4i/sun4i_backend.h | 165 +++++
drivers/gpu/drm/sun4i/sun4i_crtc.c | 120 ++++
drivers/gpu/drm/sun4i/sun4i_crtc.h | 30 +
drivers/gpu/drm/sun4i/sun4i_dotclock.c | 160 +++++
drivers/gpu/drm/sun4i/sun4i_dotclock.h | 21 +
drivers/gpu/drm/sun4i/sun4i_drv.c | 357 +++++++++++
drivers/gpu/drm/sun4i/sun4i_drv.h | 30 +
drivers/gpu/drm/sun4i/sun4i_framebuffer.c | 54 ++
drivers/gpu/drm/sun4i/sun4i_framebuffer.h | 19 +
drivers/gpu/drm/sun4i/sun4i_layer.c | 161 +++++
drivers/gpu/drm/sun4i/sun4i_layer.h | 30 +
drivers/gpu/drm/sun4i/sun4i_rgb.c | 250 ++++++++
drivers/gpu/drm/sun4i/sun4i_rgb.h | 18 +
drivers/gpu/drm/sun4i/sun4i_tcon.c | 561 ++++++++++++++++
drivers/gpu/drm/sun4i/sun4i_tcon.h | 186 ++++++
drivers/gpu/drm/sun4i/sun4i_tv.c | 708 +++++++++++++++++++++
include/drm/drm_fb_cma_helper.h | 2 +
29 files changed, 3978 insertions(+), 5 deletions(-)
create mode 100644 Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
create mode 100644 drivers/clk/sunxi/clk-sun4i-display.c
create mode 100644 drivers/gpu/drm/sun4i/Kconfig
create mode 100644 drivers/gpu/drm/sun4i/Makefile
create mode 100644 drivers/gpu/drm/sun4i/sun4i_backend.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_backend.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_crtc.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_crtc.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_dotclock.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_dotclock.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_drv.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_drv.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_framebuffer.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_framebuffer.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_layer.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_layer.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_rgb.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_rgb.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_tcon.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_tcon.h
create mode 100644 drivers/gpu/drm/sun4i/sun4i_tv.c

--
2.8.1