Re: [linux-sunxi] [PATCH v2 00/26] drm: Add Allwinner A10 display engine support

[Priit Laes <plaes@plaes.org>]

On Thu, 2016-01-14 at 16:24 +0100, Maxime Ripard wrote:
> 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.

I found some time to play with it (with intention to get it running
also on sun7i and sun4i) and ran into this when trying to build
sun4i_drm as module:

ERROR: "sun4i_tcon1_mode_set" [drivers/gpu/drm/sun4i/sun4i_tv.ko] undefined!
ERROR: "sun4i_backend_apply_color_correction" [drivers/gpu/drm/sun4i/sun4i_tv.ko] undefined!
ERROR: "sun4i_tcon_channel_disable" [drivers/gpu/drm/sun4i/sun4i_tv.ko] undefined!
ERROR: "sun4i_tcon_channel_enable" [drivers/gpu/drm/sun4i/sun4i_tv.ko] undefined!
ERROR: "clk_unregister_composite" [drivers/gpu/drm/sun4i/sun4i_tcon.ko] undefined!
ERROR: "sun4i_rgb_init" [drivers/gpu/drm/sun4i/sun4i_tcon.ko] undefined!
ERROR: "clk_register_composite" [drivers/gpu/drm/sun4i/sun4i_tcon.ko] undefined!
ERROR: "sun4i_backend_update_layer_coord" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_backend_update_layer_formats" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_tcon_channel_disable" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_tcon_enable_vblank" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_backend_update_layer_buffer" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_backend_layer_enable" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_tcon_channel_enable" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_tcon_enable" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_tcon_disable" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_tcon0_mode_set" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
ERROR: "sun4i_backend_commit" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed



> 
> Let me know what you think,
> Maxime
> 
> 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
> 
> Matthias Brugger (1):
>   clk: Add regmap support
> 
> Maxime Ripard (25):
>   reset: Move DT cell size check to the core
>   reset: Make reset_control_ops const
>   clk: composite: Add unregister function
>   clk: sunxi: Add display and TCON0 clocks driver
>   clk: sunxi: Add PLL3 clock
>   clk: sunxi: Add TCON channel1 clock
>   clk: sun5i: add DRAM gates
>   ARM: sun5i: dt: Add pll3 and pll7 clocks
>   ARM: sun5i: a13: Add display and TCON clocks
>   ARM: sun5i: Add DRAM gates
>   ARM: sun5i: Add TV encoder gate to the DTSI
>   drm/fb_cma_helper: Remove implicit call to disable_unused_functions
>   drm/modes: Rewrite the command line parser
>   drm/modes: Support modes names on the command line
>   drm: Add Allwinner A10 Display Engine support
>   drm: sun4i: Add DT bindings documentation
>   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
>   devicetree: Add olimex vendor prefix
>   drm/panel: simple: Add timings for the Olimex LCD-OLinuXino-4.3TS
>   DO NOT MERGE: ARM: sun5i: chip: Enable the LCD panel
> 
>  Documentation/devicetree/bindings/clock/sunxi.txt  |   5 +
>  .../display/panel/olimex,lcd-olinuxino-43-ts.txt   |   7 +
>  .../bindings/display/sunxi/sun4i-drm.txt           | 228 +++++++
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  arch/arm/boot/dts/sun5i-a10s.dtsi                  |   7 +-
>  arch/arm/boot/dts/sun5i-a13.dtsi                   |  46 +-
>  arch/arm/boot/dts/sun5i-r8-chip.dts                |  17 +
>  arch/arm/boot/dts/sun5i-r8.dtsi                    | 139 ++++-
>  arch/arm/boot/dts/sun5i.dtsi                       |  62 ++
>  drivers/clk/Makefile                               |   1 +
>  drivers/clk/clk-composite.c                        |  15 +
>  drivers/clk/clk-divider.c                          |  68 ++-
>  drivers/clk/clk-gate.c                             |  54 +-
>  drivers/clk/clk-io.c                               |  48 ++
>  drivers/clk/clk-io.h                               |  22 +
>  drivers/clk/clk-mux.c                              |  94 ++-
>  drivers/clk/sunxi/Makefile                         |   3 +
>  drivers/clk/sunxi/clk-simple-gates.c               |   2 +
>  drivers/clk/sunxi/clk-sun4i-display.c              | 241 ++++++++
>  drivers/clk/sunxi/clk-sun4i-pll3.c                 |  90 +++
>  drivers/clk/sunxi/clk-sun4i-tcon-ch1.c             | 154 +++++
>  drivers/gpu/drm/Kconfig                            |   2 +
>  drivers/gpu/drm/Makefile                           |   3 +-
>  drivers/gpu/drm/drm_crtc.c                         |   3 +-
>  drivers/gpu/drm/drm_fb_cma_helper.c                |   3 -
>  drivers/gpu/drm/drm_fb_helper.c                    |   4 +
>  drivers/gpu/drm/drm_modes.c                        | 327 ++++++----
>  drivers/gpu/drm/imx/imx-drm-core.c                 |   1 +
>  drivers/gpu/drm/panel/panel-simple.c               |  26 +
>  drivers/gpu/drm/sti/sti_drv.c                      |   1 +
>  drivers/gpu/drm/sun4i/Kconfig                      |  14 +
>  drivers/gpu/drm/sun4i/Makefile                     |  12 +
>  drivers/gpu/drm/sun4i/sun4i_backend.c              | 321 ++++++++++
>  drivers/gpu/drm/sun4i/sun4i_backend.h              | 160 +++++
>  drivers/gpu/drm/sun4i/sun4i_crtc.c                 | 120 ++++
>  drivers/gpu/drm/sun4i/sun4i_crtc.h                 |  30 +
>  drivers/gpu/drm/sun4i/sun4i_drv.c                  | 325 ++++++++++
>  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                | 160 +++++
>  drivers/gpu/drm/sun4i/sun4i_layer.h                |  30 +
>  drivers/gpu/drm/sun4i/sun4i_rgb.c                  | 229 +++++++
>  drivers/gpu/drm/sun4i/sun4i_rgb.h                  |  18 +
>  drivers/gpu/drm/sun4i/sun4i_tcon.c                 | 521
> ++++++++++++++++
>  drivers/gpu/drm/sun4i/sun4i_tcon.h                 | 177 ++++++
>  drivers/gpu/drm/sun4i/sun4i_tv.c                   | 675
> +++++++++++++++++++++
>  drivers/gpu/drm/tilcdc/tilcdc_drv.c                |   1 +
>  drivers/reset/core.c                               |   6 +-
>  include/drm/drm_modes.h                            |   1 +
>  include/linux/clk-provider.h                       |  55 +-
>  include/linux/reset-controller.h                   |   2 +-
>  52 files changed, 4455 insertions(+), 179 deletions(-)
>  create mode 100644
> Documentation/devicetree/bindings/display/panel/olimex,lcd-olinuxino-
> 43-ts.txt
>  create mode 100644
> Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
>  create mode 100644 drivers/clk/clk-io.c
>  create mode 100644 drivers/clk/clk-io.h
>  create mode 100644 drivers/clk/sunxi/clk-sun4i-display.c
>  create mode 100644 drivers/clk/sunxi/clk-sun4i-pll3.c
>  create mode 100644 drivers/clk/sunxi/clk-sun4i-tcon-ch1.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_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
> 
> -- 
> 2.6.4
>