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

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Message-ID: <20150904102003.GE21084@n2100.arm.linux.org.uk>
Date:	Fri, 4 Sep 2015 11:20:03 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Thierry Reding <treding@...dia.com>
Cc:	Yakir Yang <ykk@...k-chips.com>,
	Rob Herring <robherring2@...il.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>, 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 03, 2015 at 11:04:40AM +0200, Thierry Reding wrote:
> Conversely, if the panel isn't capable of generating an HPD signal, then
> I don't think it would be appropriate to make it a DT property. It would
> be better to hard-code it in the driver, lest someone forget to set the
> property in DT and get stuck with a device that isn't operational.

There is another way to deal with this: DRM supports the idea of connector
forcing - where you can force the connector to think that it's connected
or disconnected.

One of the problems is that not many ARM DRM drivers implement it - maybe
it should be a requirement for code to be accepted? :)

-- 
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