diff --git a/[refs] b/[refs]
index d6cd167c8920..87a9d2e9084d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 59b608c2c33feacc8be281ec3ba9ca2a3a5cb9a7
+refs/heads/master: 7fbb7cadd062baf299fd8b26a80ea99da0c3fe01
diff --git a/trunk/drivers/video/aty/mach64_ct.c b/trunk/drivers/video/aty/mach64_ct.c
index c50c7cf26fe9..2745b8539485 100644
--- a/trunk/drivers/video/aty/mach64_ct.c
+++ b/trunk/drivers/video/aty/mach64_ct.c
@@ -8,6 +8,9 @@
 #include <asm/io.h>
 #include <video/mach64.h>
 #include "atyfb.h"
+#ifdef CONFIG_PPC
+#include <asm/machdep.h>
+#endif
 
 #undef DEBUG
 
@@ -536,6 +539,14 @@ static int __devinit aty_init_pll_ct(const struct fb_info *info,
 	pll->ct.xclk_post_div_real = postdividers[xpost_div];
 	pll->ct.mclk_fb_div = q * pll->ct.xclk_post_div_real / 8;
 
+#ifdef CONFIG_PPC
+	if (machine_is(powermac)) {
+		/* Override PLL_EXT_CNTL & 0x07. */
+		pll->ct.xclk_post_div = xpost_div;
+		pll->ct.xclk_ref_div = 1;
+	}
+#endif
+
 #ifdef DEBUG
 	pllmclk = (1000000 * pll->ct.mclk_fb_mult * pll->ct.mclk_fb_div) /
 			(par->ref_clk_per * pll->ct.pll_ref_div);