linux-kernel - Re: [RFC 00/11] drm/bridge: dw-hdmi: implement bus-format negotiation and YUV420 support

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Message-ID: <20190821203047.06730da4@collabora.com>
Date:   Wed, 21 Aug 2019 20:30:47 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...l.net,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/11] drm/bridge: dw-hdmi: implement bus-format
 negotiation and YUV420 support

On Tue, 20 Aug 2019 10:40:58 +0200
Neil Armstrong <narmstrong@...libre.com> wrote:

> This patchset is based on Boris's "drm: Add support for bus-format negotiation" RFC at [1]

Small clarification. Neil's work in based on a slightly different
version of my RFC [4] (I plan to post a v2 very soon).

> patchset to implement :
> - basic bus-format negotiation for DW-HDMI
> - advanced HDMI2.0 YUV420 bus-format negotiation for DW-HDMI
> 
> And the counterpart implementation in the Amlogic Meson VPU dw-hdmi glue :
> - basic bus-format negotiation to select YUV444 bus-format as DW-HDMI input
> - YUV420 support when HDMI2.0 YUV420 modeset
> 
> This is a follow-up from the previous attempts :
> - "drm/meson: Add support for HDMI2.0 YUV420 4k60" at [2]
> - "drm/meson: Add support for HDMI2.0 4k60" at [3]
> 
> [1] https://patchwork.freedesktop.org/patch/msgid/20190808151150.16336-1-boris.brezillon@collabora.com
> [2] https://patchwork.freedesktop.org/patch/msgid/20190520133753.23871-1-narmstrong@baylibre.com
> [3] https://patchwork.freedesktop.org/patch/msgid/1549022873-40549-1-git-send-email-narmstrong@baylibre.com

[4]https://github.com/bbrezillon/linux-0day/commits/drm-bridge-busfmt-2

> 
> Neil Armstrong (11):
>   fixup! drm/bridge: Add the necessary bits to support bus format
>     negotiation
>   drm/meson: venc: make drm_display_mode const
>   drm/meson: meson_dw_hdmi: switch to drm_bridge_funcs
>   drm/bridge: synopsys: dw-hdmi: add basic bridge_atomic_check
>   drm/bridge: synopsys: dw-hdmi: use negociated bus formats
>   drm/meson: dw-hdmi: stop enforcing input_bus_format
>   drm/bridge: dw-hdmi: allow ycbcr420 modes for >= 0x200a
>   drm/bridge: synopsys: dw-hdmi: add 420 mode format negociation
>   drm/meson: venc: add support for YUV420 setup
>   drm/meson: vclk: add support for YUV420 setup
>   drm/meson: Add YUV420 output support
> 
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c |  97 +++++++++++++++-
>  drivers/gpu/drm/drm_bridge.c              |   6 +-
>  drivers/gpu/drm/meson/meson_dw_hdmi.c     | 135 +++++++++++++++++-----
>  drivers/gpu/drm/meson/meson_vclk.c        |  93 +++++++++++----
>  drivers/gpu/drm/meson/meson_vclk.h        |   7 +-
>  drivers/gpu/drm/meson/meson_venc.c        |   8 +-
>  drivers/gpu/drm/meson/meson_venc.h        |  13 ++-
>  drivers/gpu/drm/meson/meson_venc_cvbs.c   |   3 +-
>  include/drm/bridge/dw_hdmi.h              |   1 +
>  9 files changed, 295 insertions(+), 68 deletions(-)
>