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

[Kostas Gewrgiou]

On Mon, 7 Aug 2000, Michel [iso-8859-1] Dδnzer wrote:

>
> Kostas Gewrgiou wrote:
>
> > > The remaining problems are:
> > >
> > > 16 bit doesn't work neither with fbdev (colors completely off - does
> > > aty128fb still use 15 bit in fact?) nor without (at least the grey tones
> > > are right there - wrong endianness?)
> >
> > Yes aty128fb still doesn't support 16 bit, you could run the r128 driver
> > without fbdev to get 16 bits, but the code to switch the framebuffer to do
> > byteswapping is missing so the colors will be wrong
>
> Yep, that's the second thing I was referring to.
>
> > (easy to add though).
>
> Where and how?
>

  Somewhere in R128ModeInit (or the functions that get called from it) will
do fine i think.
About how now look at the following code from aty128fb that does the same
thing.

    config = aty_ld_le32(CONFIG_CNTL) & ~3;
#if defined(__BIG_ENDIAN)
    if (par->crtc.bpp >= 24)
        config |= 2;    /* make aperture do 32 byte swapping */
    else if (par->crtc.bpp > 8)
        config |= 1;    /* make aperture do 16 byte swapping */
#endif
    aty_st_le32(CONFIG_CNTL, config);

  Kostas


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