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    SubjectRe: mach64 breakage in 2.6.22
    On Thu, Jun 14, 2007 at 10:25:28AM +0200, Olaf Hering wrote:
    > On Sat, May 05, Andrew Morton wrote:
    >
    > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm1/
    >
    > > +atyfb-reorganize-clock-init.patch
    >
    > This change breaks the display on an ibook1 with 800x600 lcd.

    Are you sure? I would expect
    atyfb-halve-xclk-with-mobility-and-32bit-memory.patch to cause more
    problems.

    > It is commit b4e124c138558a0cff51398ddff9a8e44ed0b529 in 2.6.22-rc4.
    > The used config is arch/powerpc/configs/pmac32_defconfig
    >
    > It seems that the recognized display width is only 640, the remain space
    > up to 800 is repeated with the content from colum 0. The chars around
    > colum 640 are mostly garbage.
    >
    > .....
    > atyfb: using auxiliary register aperture
    > atyfb: 3D RAGE Mobility L (Mach64 LN, AGP 2x) [0x4c4e rev 0x64]
    > atyfb: 4M SDRAM (2:1) (32-bit), 14.31818 MHz XTAL, 230 MHz PLL, 70 Mhz MCLK, 27 MHz XCLK

    This seems to confirm my suspicion.

    Please try this patch:

    ---
    drivers/video/aty/atyfb_base.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    Index: linux-2.6.22-rc2/drivers/video/aty/atyfb_base.c
    ===================================================================
    --- linux-2.6.22-rc2.orig/drivers/video/aty/atyfb_base.c
    +++ linux-2.6.22-rc2/drivers/video/aty/atyfb_base.c
    @@ -2295,7 +2295,7 @@ static int __devinit aty_init(struct fb_
    * and set the frequency manually. */
    if (machine_is_compatible("PowerBook2,1")) {
    par->pll_limits.mclk = 70;
    - par->pll_limits.xclk = 53;
    + par->pll_limits.xclk = 106;
    }
    #endif

    --
    Ville Syrjälä
    syrjala@sci.fi
    http://www.sci.fi/~syrjala/
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