Messages in this thread |  | | Date | Fri, 23 Sep 2011 07:17:03 +0200 | | Subject | Re: [PATCH] gma500: gtt based hardware scrolling console | | From | Geert Uytterhoeven <> |
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On Thu, Sep 22, 2011 at 22:21, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote: >> > + 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.
Then it should not set ypanstep to a non-zero value, and set/handle the other various *YWRAP flags, to communicate with the frame buffer console driver.
Panning is moving inside a virtual screen bigger than the visible screen size.
> 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 ?
Yep, that should work. The console code can use ywrap resp. ypan if the font height is a multiple of ywrapstep resp. ypanstep.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
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