linux-kernel - Re: [PATCH v2] drm/bridge: ps8640: Drop the ability of ps8640 to fetch the EDID

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Message-ID: <168753355470.231132.10951468877350580125.b4-ty@kernel.org>
Date:   Fri, 23 Jun 2023 17:19:33 +0200
From:   Robert Foss <rfoss@...nel.org>
To:     dri-devel@...ts.freedesktop.org,
        Douglas Anderson <dianders@...omium.org>
Cc:     Robert Foss <rfoss@...nel.org>, Icenowy Zheng <uwu@...nowy.me>,
        David Airlie <airlied@...il.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        Maxime Ripard <mripard@...nel.org>,
        Pin-yen Lin <treapking@...omium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v2] drm/bridge: ps8640: Drop the ability of ps8640 to fetch the EDID

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