linux-kernel - Re: [PATCH v4 14/16] drm: bridge: analogix/dp: try force hpd after plug in lookup failed

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Date:	Thu, 3 Sep 2015 16:55:59 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Thierry Reding <treding@...dia.com>
Cc:	Yakir Yang <ykk@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
	Jingoo Han <jingoohan1@...il.com>,
	Inki Dae <inki.dae@...sung.com>, Joe Perches <joe@...ches.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Mark Yao <mark.yao@...k-chips.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	djkurtz@...omium.com, dianders@...omium.com, seanpaul@...omium.com,
	Ajay kumar <ajaynumb@...il.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	David Airlie <airlied@...ux.ie>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Andy Yan <andy.yan@...k-chips.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Kishon Vijay Abraham I <kishon@...com>,
	architt@...eaurora.org,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	linux-rockchip@...ts.infradead.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 14/16] drm: bridge: analogix/dp: try force hpd after
 plug in lookup failed

On Thu, Sep 3, 2015 at 3:47 AM, Thierry Reding <treding@...dia.com> wrote:
> On Wed, Sep 02, 2015 at 03:17:57PM -0500, Rob Herring wrote:
> [...]
>> Are there any eDP panels which don't have EDID and need panel details in DT?
>
> Most panels need information other than EDID. They typically have some
> requirements regarding the power up sequence that aren't to be found
> anywhere in EDID or detectable by some other mechanism. A decision was
> therefore made a long time ago to require panels to be listed in DT with
> a specific compatible string. That way all of these details can be
> stashed away in drivers that know how to deal with these kinds of
> details.

I guess I was being hopeful that eDP was improving that situation.

Rob
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