linux-kernel - Re: [PATCH 0/7] drm/sun4i: Introduce A33 display driver

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Date:   Sat, 3 Sep 2016 09:43:59 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Icenowy Zheng <icenowy@...c.xyz>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Thierry Reding <thierry.reding@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/7] drm/sun4i: Introduce A33 display driver

On Sat, Sep 3, 2016 at 3:06 AM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Hi Icenowy,
>
> On Fri, Sep 02, 2016 at 09:30:05AM +0800, Icenowy Zheng wrote:
>>
>>
>> 01.09.2016, 23:40, "Maxime Ripard" <maxime.ripard@...e-electrons.com>:
>> > Hi everyone,
>> >
>> > This serie introduces the support in the sun4i-drm driver for the A33.
>> >
>> > Beside the new IPs and special cases for the A33 new IPs, there's
>> > nothing really outstanding, and is now at feature parity with the A13.
>>
>> How can the driver be modified to support LVDS screen?
>>
>> I have an A33 tablet with a 1024x768 LVDS panel. (iNet D978 Rev2 board,
>> which I pushed a dt a few days ago)
>
> Awesome, I don't have such a screen myself, so feel free to work on
> it.
>
> I haven't looked into the details of LVDS, but it should be something
> along the lines of commit 29e57fab97fc ("drm: sun4i: Add RGB output").

The implementation might be along the lines of

  1. having multiple output ports, each for a different interface type.
     (Some platforms go this route)

Or

  2. having a DT property describe what the output interface is.

The RGB/TCON driver would then setup the registers accordingly.


ChenYu