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

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Message-ID: <20160905203707.GF8596@lukather>
Date:   Mon, 5 Sep 2016 22:37:07 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Icenowy Zheng <icenowy@...c.xyz>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Thierry Reding <thierry.reding@...il.com>,
        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 03, 2016 at 09:43:59AM +0800, Chen-Yu Tsai wrote:
> 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.

Hmmm, yeah, we would need to adjust the bindings too...

I guess I'd prefer 1), but that would also be the most invasive
solution. I'm not sure how the DT maintainers feel about that.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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