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From:   Robert Foss <rfoss@kernel.org>
To:     dri-devel@lists.freedesktop.org,
        Douglas Anderson <dianders@chromium.org>
Cc:     Robert Foss <rfoss@kernel.org>, Icenowy Zheng <uwu@icenowy.me>,
        David Airlie <airlied@gmail.com>,
        Andrzej Hajda <andrzej.hajda@intel.com>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        linux-mediatek@lists.infradead.org,
        Matthias Brugger <matthias.bgg@gmail.com>,
        linux-arm-kernel@lists.infradead.org,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Jonas Karlman <jonas@kwiboo.se>, linux-kernel@vger.kernel.org,
        Maxime Ripard <mripard@kernel.org>,
        Pin-yen Lin <treapking@chromium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH v2] drm/bridge: ps8640: Drop the ability of ps8640 to fetch the EDID
Date:   Fri, 23 Jun 2023 17:19:33 +0200
Message-ID: <168753355470.231132.10951468877350580125.b4-ty@kernel.org>
In-Reply-To: <20230616165517.v2.1.I7b8f60b3fbfda068f9bf452d584dc934494bfbfa@changeid>
References: <20230616165517.v2.1.I7b8f60b3fbfda068f9bf452d584dc934494bfbfa@changeid>
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On Fri, 16 Jun 2023 16:55:17 -0700, Douglas Anderson wrote:
> In order to read the EDID from an eDP panel, you not only need to
> power on the bridge chip itself but also the panel. In the ps8640
> driver, this was made to work by having the bridge chip manually power
> the panel on by calling pre_enable() on everything connectorward on
> the bridge chain. This worked OK, but...
> 
> ...when trying to do the same thing on ti-sn65dsi86, feedback was that
> this wasn't a great idea. As a result, we designed the "DP AUX"
> bus. With the design we ended up with the panel driver itself was in
> charge of reading the EDID. The panel driver could power itself on and
> the bridge chip was able to power itself on because it implemented the
> DP AUX bus.
> 
> [...]

Applied, thanks!

[1/1] drm/bridge: ps8640: Drop the ability of ps8640 to fetch the EDID
      https://cgit.freedesktop.org/drm/drm-misc/commit/?id=26195af57798


Rob