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List:       linuxppc-dev
Subject:    LCD stretching partially working!
From:       geert () linux-m68k ! org (Geert Uytterhoeven)
Date:       1999-10-28 20:46:52
Message-ID: Pine.LNX.4.05.9910282243080.6037-100000 () callisto ! of ! borg
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On Thu, 28 Oct 1999, Josh Huber wrote:
> I'm working on getting hardware stretching for the Rage LT chipset
> (wallst. & lombard at least), and have got this far:
> 
> 
> In console mode:
> 1. Stretching in the vertical direction works
> 2. stretching in the horiz direction works

Great!

> 3. doing both at the same time appears to work...except for a little
>    screen flicker. (what could cause this?)

Two possible solutions:

  - Does it help if you lower the mclk?
  - Perhaps the display FIFO parameters have to take into account the
    stretching? At least for the horizontal stretching this sounds logical to
    me, i.e. try to use

    xclks_per_row = (pll->mclk_fb_div*pll->vclk_post_div_real*64*hstretch<<11)/
		    (pll->vclk_fb_div*pll->mclk_post_div_real*bpp);

Gr{oetje,eeting}s,
--
Geert Uytterhoeven -- Linux/{m68k~Amiga,PPC~CHRP} -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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