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SubjectRe: mach64 breakage in 2.6.22
On Mon, Jun 18, 2007 at 04:45:34PM +0200, Olaf Hering wrote:
> On Thu, Jun 14, Ville Syrjälä wrote:
>
> > 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?
>
> Yes.

Strange. Either patch alone should not cause any change in the clock
frequencies. Combined the two and it should lead to exactly the dmesg
you posted.
>
> > Please try this patch:
>
> > if (machine_is_compatible("PowerBook2,1")) {
> > par->pll_limits.mclk = 70;
> > - par->pll_limits.xclk = 53;
> > + par->pll_limits.xclk = 106;
>
> This oneliner fixes it for me.

Here's a slightly safer version, just in case there are iBooks with
non-mobility chips or using the 64bit memory interface.


atyfb: Fix XCLK frequency on Apple iBook1

Fix a regression on Apple iBook1. Changes in the clock init code
caused an incorrect XCLK frequency to be used leading to a corrupted
display.

Signed-off-by: Ville Syrjala <syrjala@sci.fi>
---
drivers/video/aty/atyfb_base.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
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
@@ -2290,15 +2290,6 @@ static int __devinit aty_init(struct fb_
init_waitqueue_head(&par->vblank.wait);
spin_lock_init(&par->int_lock);

-#ifdef CONFIG_PPC_PMAC
- /* The Apple iBook1 uses non-standard memory frequencies. We detect it
- * and set the frequency manually. */
- if (machine_is_compatible("PowerBook2,1")) {
- par->pll_limits.mclk = 70;
- par->pll_limits.xclk = 53;
- }
-#endif
-
#ifdef CONFIG_FB_ATY_GX
if (!M64_HAS(INTEGRATED)) {
u32 stat0;
@@ -2383,6 +2374,14 @@ static int __devinit aty_init(struct fb_
par->pll_limits.xclk = (par->pll_limits.xclk + 1) >> 1;
}
#endif
+#ifdef CONFIG_PPC_PMAC
+ /* The Apple iBook1 uses non-standard memory frequencies. We detect it
+ * and set the frequency manually. */
+ if (machine_is_compatible("PowerBook2,1")) {
+ par->pll_limits.mclk = 70;
+ par->pll_limits.xclk = 53;
+ }
+#endif

/* Allow command line to override clocks. */
if (pll)
--
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/
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