Re: [Dri-devel] Re: Kind of success! (r128 on PPC (Re: LinuxPPC X Server))

On Mon, 7 Aug 2000, Josh Huber wrote:

On Mon, Aug 07, 2000 at 09:08:01AM +0200, Michel D?nzer wrote:

quoted

Benjamin Herrenschmidt wrote:

quoted

The Pismo allows that by scaling the LCD, but I don't think code for that
is implemented in the XFree r128 driver (I didn't check lately).

No it doesn't work, neither with aty128fb. Would that be hard to implement?

If it's anything like the mach 64, it shouldn't be hard to implement
at all.  you just have to program 3 registers.

Speaking of this, I'm having trouble with the stretching setup for my
wallstreet.  It works fine in console mode, but something in the X
server is messing with the chip setup in a way to screw up the
rendering.  After playing with it I was able to get proper output:

console settings:
    mclk = 99.844107 MHz
    vclk = 44.702930 MHz
    dsp_loop_latency = 10
    dsp_precision = 5
    dsp_xclks_per_row = 1143 => 17.859375
    dsp_on = 69 => 34.500000
    dsp_off = 1113 => 556.500000

X (xf4.0.1) settings:
    mclk = 99.844107 MHz
    vclk = 44.702930 MHz
    dsp_loop_latency = 10
    dsp_precision = 4
    dsp_xclks_per_row = 1143 => 8.929688
    dsp_on = 103 => 25.750000
    dsp_off = 1119 => 279.750000

Is this XF4.0.1 in `fbdev' mode? If yes, it's a bug in the X server. Setting
the DSP registers is part of the video mode initialization and thus is the
sole responsability of the frame buffer device, when running in `fbdev' mode.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@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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