Re: [PATCH 00/11] drm/meson: Initial support for HDMI Output

[Daniel Vetter]

On Thu, Mar 02, 2017 at 04:39:56PM +0100, Neil Armstrong wrote:
> The Amlogic GX SoCs implements a Synopsys DesignWare HDMI TX Controller
> in combination with a very custom PHY.
> 
> This patchset depends on Laurent Pinchart v4 patchset at [1] and my v2
> patchset at [2] to permit PHY control from outside the dw-hdmi driver.
> 
> The Synopsys DesignWare HDMI TX Controller is integrated like :
>          ___________________________________
>         |            HDMI TOP               |<= HPD
>         |___________________________________|
>         |                  |                |
> HDMI-TX-|  Synopsys HDMI   |   HDMI PHY     |=> TMDS
>         |    Controller    |________________|
>         |___________________________________|<=> DDC
> 
> And uses the following paths for Pixels Encoding :
>        _____   _____   ____________________
> vd1---|     |-|     | | VENC     /---------|----VDAC
> vd2---| VIU |-| VPP |-|-----ENCI/-ENCI_DVI-|\
> osd1--|     |-|     | | \                  | X--HDMI-TX
> osd2--|_____|-|_____| |  |\-ENCP--ENCP_DVI-|/
>                       |  |                 |
>                       |  \--ENCL-----------|----LVDS
>                       |____________________|
> 
> The ENCI and ENCP encoders pre-formats the data for the ENCI-DVI and
> ENCP-DVI encoders. Those DVI encoders will format the pixels for the
> Synopsys DesignWare HDMI TX Controller.
> 
> In order to support display modes, the ENCI and ENCP encoders needs very
> specific parameters for *each* display modes, so usage of the CEA VIC
> identifier is necessary. But the DVI timings are generated from the
> drm_mode structure in a generic way.
> 
> To simplify the first push, only the main CEA modes are supported up to
> 1920x1080p60. Supporting the 480i and 576i needs tweaking in the dw-hdmi
> in order to support the Clock Doubling necessary for these modes.
> 
> Support for more traditional modes like the EDID fallback modes is planned
> but will need tome additionnal handling along the CEA modes.
> Support for 4k2k modes needs to be able to get the EDID HDMI modes, but
> for now only the HDMI 1.4 modes are currently available in the drm_edid
> implementation.

Btw, with the neat ascii-art stuff here and in comments in your code, did
you look into assembling all that into a meson driver documentation
chapter like the one for vc4 that was just merged?
-Daniel

> 
> This patchset does :
>  - Fixes the CRTC handling
>  - Fixes the registers definitions
>  - Adds support for device components registration along of-graph
>  - Adds support for HDMI clocks
>  - Adds support for HDMI VENC video modes
>  - Adds support for the Custom HDMI PHY using callbacks added in [1] and [2]
>  - Adds CMA node to reserve enougth memory for 1080p display
>  - Adds the HDMI controller et connector modes on selected boards
>  - Adds a proper dt-bindings for the HDMI controller et connector
>  - Updates the MAINTAINERS file to track the new files
> 
> [1] http://lkml.kernel.org/r/20170301223915.29888-1-laurent.pinchart+renesas@xxxxxxxxxxxxxxxx
> [2] http://lkml.kernel.org/r/1488468572-31971-1-git-send-email-narmstrong@xxxxxxxxxxxx
> 
> Neil Armstrong (11):
>   drm/meson: Use crtc_state for hdisplay and fix atomic flush/enable
>     sync for vsync commit
>   drm/meson: Add missing HDMI register
>   drm/meson: Add support for components
>   drm/meson: venc_cvbs: no more return -ENODEV if CVBS is not available
>   drm/meson: add support for HDMI clock support
>   drm/meson: Add support for HDMI venc modes and settings
>   drm/meson: Add support for HDMI encoder and DW-HDMI bridge + PHY
>   ARM64: dts: meson-gx: Add shared CMA dma memory pool
>   ARM64: dts: meson-gx: Add support for HDMI output
>   dt-bindings: Add bindings for the Amlogic Meson dw-hdmi extension
>   MAINTAINERS: update files for Amlogic DRM Driver
> 
>  .../bindings/display/amlogic,meson-dw-hdmi.txt     |  111 ++
>  MAINTAINERS                                        |    1 +
>  .../arm64/boot/dts/amlogic/meson-gx-p23x-q20x.dtsi |   39 +
>  arch/arm64/boot/dts/amlogic/meson-gx.dtsi          |   40 +
>  .../boot/dts/amlogic/meson-gxbb-nexbox-a95x.dts    |   23 +
>  arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi   |   23 +
>  arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   12 +
>  .../boot/dts/amlogic/meson-gxl-nexbox-a95x.dts     |   23 +
>  arch/arm64/boot/dts/amlogic/meson-gxl.dtsi         |   13 +
>  .../arm64/boot/dts/amlogic/meson-gxm-nexbox-a1.dts |   23 +
>  arch/arm64/boot/dts/amlogic/meson-gxm.dtsi         |    4 +
>  drivers/gpu/drm/meson/Kconfig                      |    6 +
>  drivers/gpu/drm/meson/Makefile                     |    1 +
>  drivers/gpu/drm/meson/meson_crtc.c                 |   15 +-
>  drivers/gpu/drm/meson/meson_drv.c                  |  113 +-
>  drivers/gpu/drm/meson/meson_drv.h                  |    3 +
>  drivers/gpu/drm/meson/meson_dw_hdmi.c              |  918 +++++++++++++++
>  drivers/gpu/drm/meson/meson_dw_hdmi.h              |  146 +++
>  drivers/gpu/drm/meson/meson_registers.h            |    1 +
>  drivers/gpu/drm/meson/meson_vclk.c                 |  624 +++++++++-
>  drivers/gpu/drm/meson/meson_vclk.h                 |    6 +-
>  drivers/gpu/drm/meson/meson_venc.c                 | 1245 +++++++++++++++++++-
>  drivers/gpu/drm/meson/meson_venc.h                 |    7 +
>  drivers/gpu/drm/meson/meson_venc_cvbs.c            |   11 +-
>  drivers/gpu/drm/meson/meson_vpp.h                  |    2 +
>  25 files changed, 3370 insertions(+), 40 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt
>  create mode 100644 drivers/gpu/drm/meson/meson_dw_hdmi.c
>  create mode 100644 drivers/gpu/drm/meson/meson_dw_hdmi.h
> 
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch