linux-kernel - Re: [PATCH] gma500: gtt based hardware scrolling console

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Date:	Thu, 22 Sep 2011 21:21:46 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	greg@...ah.com, linux-kernel@...r.kernel.org,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH] gma500: gtt based hardware scrolling console

> > +       info->fix.ywrapstep = gtt_roll;
> 
> Do you really want to set this? I didn't see any other wrapping
> support in your patch.
> However, I guess you can implement wrapping support using the same
> mapping trick?

It is actually wrapping - it writes the low pages back below the high
ones so it works the GTT as a circular buffer - or am I misunderstanding
this.

One thing I wasn't sure of on the fb side. If I've got a display width
that is annoying and can't fit on a 4Kbyte stride am I right in thinking
I can set this to say 8 and use a 512 byte stride and still get
acceleration for the usual font choice ?

Alan
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