linux-kernel - Re: [PATCH v3 06/14] Documentation: drm/bridge: add document for analogix

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Message-ID: <20150825142150.GB3820@ulmo.nvidia.com>
Date:	Tue, 25 Aug 2015 16:21:51 +0200
From:	Thierry Reding <treding@...dia.com>
To:	Yakir Yang <ykk@...k-chips.com>
CC:	Heiko Stuebner <heiko@...ech.de>,
	Jingoo Han <jingoohan1@...il.com>,
	"Fabio Estevam" <fabio.estevam@...escale.com>,
	Inki Dae <inki.dae@...sung.com>, <joe@...ches.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	<djkurtz@...gle.com>, <dianders@...gle.com>, <seanpaul@...gle.com>,
	"Takashi Iwai" <tiwai@...e.de>, <ajaynumb@...il.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	"Philipp Zabel" <p.zabel@...gutronix.de>,
	David Airlie <airlied@...ux.ie>,
	"Gustavo Padovan" <gustavo.padovan@...labora.co.uk>,
	Vincent Palatin <vpalatin@...omium.org>,
	Mark Yao <mark.yao@...k-chips.com>,
	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>,
	<dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-samsung-soc@...r.kernel.org>,
	<linux-rockchip@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 06/14] Documentation: drm/bridge: add document for
 analogix_dp

On Tue, Aug 25, 2015 at 10:03:52PM +0800, Yakir Yang wrote:
> Hi Thierry,
> 
> 在 2015/8/25 17:58, Thierry Reding 写道:
> >On Wed, Aug 19, 2015 at 09:50:34AM -0500, Yakir Yang wrote:
> >[...]
> >>+	-analogix,color-space:
> >>+		input video data format.
> >>+			COLOR_RGB = 0, COLOR_YCBCR422 = 1, COLOR_YCBCR444 = 2
> >I don't think DT is an appropriate place to set this. To my knowledge
> >this depends on the display and/or mode, so I don't think hard-coding
> >it here is the right thing to do.
> 
> Yeah, same question with my previous reply ;)

I don't have an answer for you, unfortunately. But like I said,
hard-coding isn't going to work. What if, for example, you set this to a
fixed value and then you connect a monitor that doesn't support the
specific one you set?

You cited code from dw_hdmi.c earlier, it looks like it might be correct
even though it doesn't cite a reference for why this was done. Perhaps
someone on this thread, or someone involved with dw_hdmi can answer
where that code came from.

Thierry

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