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

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Message-ID: <55DC3742.2070308@rock-chips.com>
Date:	Tue, 25 Aug 2015 17:37:06 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Thierry Reding <treding@...dia.com>,
	Rob Herring <robherring2@...il.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 Perches <joe@...ches.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Sean Paul <seanpaul@...gle.com>, Takashi Iwai <tiwai@...e.de>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Vincent Palatin <vpalatin@...omium.org>,
	linux-rockchip@...ts.infradead.org,
	Kishon Vijay Abraham I <kishon@...com>,
	David Airlie <airlied@...ux.ie>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Doug Anderson <dianders@...gle.com>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Yao <mark.yao@...k-chips.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Ajay kumar <ajaynumb@...il.com>,
	Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v3 06/14] Documentation: drm/bridge: add document for
 analogix_dp

Hi Thierry,

在 2015/8/25 17:15, Thierry Reding 写道:
> On Sun, Aug 23, 2015 at 06:23:14PM -0500, Rob Herring wrote:
>> On Wed, Aug 19, 2015 at 9:50 AM, Yakir Yang <ykk@...k-chips.com> wrote:
> [...]
>>> +       -analogix,link-rate:
>>> +               max link rate supported by the eDP controller.
>>> +                       LINK_RATE_1_62GBPS = 0x6, LINK_RATE_2_70GBPS = 0x0A,
>>> +                       LINK_RATE_5_40GBPS = 0x14
>> Same here. I'd rather see something like "link-rate-mbps" and use the
>> actual rate.
> There is no need whatsoever to hard-code this in DT. (e)DP provides the
> means to detect what rate the link supports and the specification
> provides guidance on how to select an appropriate one.

Hmm... could you share more about this :-)

I only find that drm_dp_link_probe() could get the panel link-rate and
num-lanes by reading the DP_DPCD_REV messag.

I don't found there are some guidance to help select the approriate one.
Beside this DT prop just indicate the max eDP controller link-rate & lanes
support, how could eDP detect them automatically?

- Yakir

>>> +       -analogix,lane-count:
>>> +               max number of lanes supported by the eDP contoller.
>>> +                       LANE_COUNT1 = 1, LANE_COUNT2 = 2, LANE_COUNT4 = 4
>> And drop the vendor prefix here.
> Same as for the link rate.
>
> Thierry


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