linux-kernel - Re: [PATCH 1/5] dt-bindings: drm/bridge/synopsys: dw-hdmi: Add "unwedge" for ddc bus

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Date:   Tue, 14 May 2019 15:49:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, Sandy Huang <hjc@...k-chips.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-rockchip@...ts.infradead.org,
        Neil Armstrong <narmstrong@...libre.com>,
        Mark Rutland <mark.rutland@....com>, mka@...omium.org,
        Sean Paul <seanpaul@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        linux-arm-kernel@...ts.infradead.org,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 1/5] dt-bindings: drm/bridge/synopsys: dw-hdmi: Add
 "unwedge" for ddc bus

On Thu,  2 May 2019 15:53:32 -0700, Douglas Anderson wrote:
> In certain situations it was seen that we could wedge up the DDC bus
> on the HDMI adapter on rk3288.  The only way to unwedge was to mux one
> of the pins over to GPIO output-driven-low temporarily and then
> quickly mux back.  Full details can be found in the patch
> ("drm/bridge/synopsys: dw-hdmi: Add "unwedge" for ddc bus").
> 
> Since unwedge requires remuxing the pins, we first need to add to the
> bindings so that we can specify what state the pins should be in for
> unwedging.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>  .../bindings/display/rockchip/dw_hdmi-rockchip.txt         | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Reviewed-by: Rob Herring <robh@...nel.org>