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Message-ID: <20170302155845.pybae7xtuzjpawx6@phenom.ffwll.local>
Date: Thu, 2 Mar 2017 16:58:45 +0100
From: Daniel Vetter <daniel@...ll.ch>
To: Neil Armstrong <narmstrong@...libre.com>
Cc: 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 00/11] drm/meson: Initial support for HDMI Output
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@ideasonboard.com
> [2] http://lkml.kernel.org/r/1488468572-31971-1-git-send-email-narmstrong@baylibre.com
>
> 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
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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