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Date:   Tue, 4 Apr 2017 11:21:34 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     airlied@...ux.ie, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 00/13] drm/meson: Initial support for HDMI Output

On 04/04/2017 11:04 AM, Daniel Vetter wrote:
> On Tue, Mar 21, 2017 at 04:25:37PM +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 patchset merged in drm-misc-next
>> and my v4 patchset at [1] 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.
> 
> Ok I scanned throught this and applied a bunch of comments. Mostly because
> I need volunteers to review one of my own patch series that I need to
> resend after some polish.
> 
> But I think it'd would be a _lot_ more useful if the various arm-soc
> drivers would cross-check their driver amongst themselves. Especially
> around drm bridges there's a lot of people involved, almost all hang out
> on #dri-devel, so should be very easy to coordinate some cross review.

Seems legit, I'll try next time, but sincerely I have far less experience with DRM.
but I could at least all the arm-soc specific stuff for sure.

> 
> On all the patches except the dt ones: Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>

Thanks,
Neil
> -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
>>  - Add RST documentation for Meson DRM driver
>>  - Updates the MAINTAINERS file to track the new files
>>
>> Changes since v1 patchset at [2] :
>>  - Add the meson drm documentation from [3] to this patchset
>>  - Update with new bus formats and HPD callbacks
>>  - Drop all the of_machine_is_compatible
>>
>> [1] http://lkml.kernel.org/r/1490109161-20529-1-git-send-email-narmstrong@baylibre.com
>> [2] http://lkml.kernel.org/r/1488469207-523-1-git-send-email-narmstrong@baylibre.com
>> [3] http://lkml.kernel.org/r/1488536068-9407-1-git-send-email-narmstrong@baylibre.com
>>
>> Neil Armstrong (13):
>>   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
>>   drm/meson: Convert existing documentation to actual kerneldoc
>>   drm/meson: Add RST to bring together kerneldoc
>>   MAINTAINERS: update files for Amlogic DRM Driver
>>
>>  .../bindings/display/amlogic,meson-dw-hdmi.txt     |  111 ++
>>  Documentation/gpu/index.rst                        |    1 +
>>  Documentation/gpu/meson.rst                        |   61 +
>>  MAINTAINERS                                        |    2 +
>>  .../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 +
>>  .../dts/amlogic/meson-gxl-s905x-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         |    3 +
>>  drivers/gpu/drm/meson/Kconfig                      |    6 +
>>  drivers/gpu/drm/meson/Makefile                     |    1 +
>>  drivers/gpu/drm/meson/meson_canvas.c               |    4 +-
>>  drivers/gpu/drm/meson/meson_crtc.c                 |   15 +-
>>  drivers/gpu/drm/meson/meson_drv.c                  |  118 +-
>>  drivers/gpu/drm/meson/meson_drv.h                  |    3 +
>>  drivers/gpu/drm/meson/meson_dw_hdmi.c              |  919 ++++++++++++++
>>  drivers/gpu/drm/meson/meson_dw_hdmi.h              |  146 +++
>>  drivers/gpu/drm/meson/meson_registers.h            |    1 +
>>  drivers/gpu/drm/meson/meson_vclk.c                 |  632 +++++++++-
>>  drivers/gpu/drm/meson/meson_vclk.h                 |    6 +-
>>  drivers/gpu/drm/meson/meson_venc.c                 | 1254 +++++++++++++++++++-
>>  drivers/gpu/drm/meson/meson_venc.h                 |    7 +
>>  drivers/gpu/drm/meson/meson_venc_cvbs.c            |   11 +-
>>  drivers/gpu/drm/meson/meson_viu.c                  |    6 +-
>>  drivers/gpu/drm/meson/meson_vpp.c                  |    8 +-
>>  drivers/gpu/drm/meson/meson_vpp.h                  |    2 +
>>  30 files changed, 3466 insertions(+), 47 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt
>>  create mode 100644 Documentation/gpu/meson.rst
>>  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
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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