linux-kernel - Re: [PATCH v2 6/6] ARM: dts: mmp2: add OLPC XO 1.75 machine

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Date:   Mon, 5 Aug 2019 11:56:00 +0200 (CEST)
From:   Lubomir Rintel <lkundrak@...sk>
To:     Pavel Machek <pavel@....cz>
Cc:     Olof Johansson <olof@...om.net>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] ARM: dts: mmp2: add OLPC XO 1.75 machine

----- On Aug 3, 2019, at 10:58 AM, Pavel Machek pavel@....cz wrote:

> On Fri 2019-08-02 12:33:26, Lubomir Rintel wrote:
>> This is a fairly complete description of an OLPC XO 1.75 laptop.
>> What's missing for now is the GPU, LCD controller, DCON, the panel and
>> audio.
> 
> Ok, but I need GPU/LCD/panel... that's my only output. Is video
> expected to work in 5.2? Does the firmware pass right device tree,
> including the GPU/LCD/DCON?

The firmware (and the dts) uses a simple-framebuffer. You won't get
any nifty features, but you'll get a framebuffer.

Hopefully we'll get a proper DRM video soon. The status is roughly
as follows:

LCDC: potentially supported by the Armada DRM driver. Patches sent to
Russell King some months ago, not there yet. I'd prefer not to nag him.

DCON: Russell dislikes the idea of a DRM bridge, DRM maintainers prefer
if the driver was not a DRM encoder driver. This seems to require
quite some work to fix [1].

[1] https://www.spinics.net/lists/dri-devel/msg201927.html

GPU: supported by the etnaviv driver, good enough for 2D acceleration
to work with xorg-x11-video-armada driver. 3D (weston and mutter alike)
is broken. To add this to the device tree, the clock and power needs
to be figured out.

> Is there config somewhere I could use?
> 
> Thanks a lot,
>								Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures)
> http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html