linux-kernel - Re: Proposal for a low-level Linux display framework

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Message-ID: <CAMeQTsbCXEb01C4X3nKdNyE5FJuQojaMKbcY1dSk5y3kKwkiXg@mail.gmail.com>
Date:	Wed, 21 Sep 2011 20:07:15 +0200
From:	Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	Keith Packard <keithp@...thp.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-dev@...ts.linaro.org,
	"Clark, Rob" <rob@...com>, Archit Taneja <archit@...com>
Subject: Re: Proposal for a low-level Linux display framework

On Wed, Sep 21, 2011 at 8:01 AM, Tomi Valkeinen wrote:
> I don't know what MCS is.

MCS is manufacturer specific commands (Manufacturer Command Set).

> But DSI is just a bi-directional transfer
> protocol between the SoC and the peripheral, you can send arbitrary data
> over it.
>
> Normally the SoC composes a pixel stream using overlays and whatnot,
> which goes to the DSI hardware, which then serializes the data and sends
> it to the peripheral.
>
> But you can as well send any data, like commands, and the peripheral can
> respond with any relevant data.

Ok it makes sense now, and I see how it can get more complicated than SDVO.
A DSI lib is a good idea and interfaces for stuff like backlight and mechanisms
for queuing commands that need to go in during blanking.

Thanks for clearing it up
-Patrik
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