From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S935118Ab1IOVck (ORCPT <rfc822;w@1wt.eu>);
	Thu, 15 Sep 2011 17:32:40 -0400
Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:38429 "EHLO
	www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org
	with ESMTP id S934922Ab1IOVci (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 15 Sep 2011 17:32:38 -0400
Date: Thu, 15 Sep 2011 22:31:24 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Keith Packard <keithp@keithp.com>, Tomi Valkeinen <tomi.valkeinen@ti.com>,
        linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linaro-dev@lists.linaro.org,
        "Clark\, Rob" <rob@ti.com>, Archit Taneja <archit@ti.com>
Subject: Re: Proposal for a low-level Linux display framework
Message-ID: <20110915223124.7c24e6bb@lxorguk.ukuu.org.uk>
In-Reply-To: <4E72561C.7060603@gmx.de>
References: <1316088425.11294.78.camel@lappyti>
	<yunboul7sx7.fsf@aiko.keithp.com>
	<1316100594.23214.65.camel@deskari>
	<yun8vpp7qk7.fsf@aiko.keithp.com>
	<4E72320B.6020000@gmx.de>
	<20110915181802.69ef0d56@lxorguk.ukuu.org.uk>
	<4E723A20.2040002@gmx.de>
	<20110915200514.74bdcd90@lxorguk.ukuu.org.uk>
	<4E72561C.7060603@gmx.de>
X-Mailer: Claws Mail 3.7.9 (GTK+ 2.24.4; x86_64-redhat-linux-gnu)
Face: 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
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

> Okay, I see your problem. It's a bit strange you don't have acceleration. I

The hardware has 3D acceleration but not open so we can't support it.
There is no 2D acceleration - which seems to be increasingly common.

At some point I'll add hardware scrolling however by using the GTT to
implemnent scroll wrapping.

> sound like a big problem to me, but pretty inefficient, so probably copying the
> existing ones and adjusting it to your needs would be preferred (just like the
> sys* implementations exist).

I did have a look at the current ones but fixing them up given scan lines
can span page boundaries looked pretty horrible so I deferred it until I
feel inspired.

Alan