atyfb: Increase SPLL delay

Index: linux-2.6.20.3/drivers/video/aty/mach64_ct.c
===================================================================
@@ -608,12 +608,10 @@ static void aty_resume_pll_ct(const stru
 		aty_st_pll_ct(SCLK_FB_DIV, pll->ct.sclk_fb_div, par);
 		aty_st_pll_ct(SPLL_CNTL2, pll->ct.spll_cntl2, par);
 		/*
-		 * The sclk has been started. However, I believe the first clock
-		 * ticks it generates are not very stable. Hope this primitive loop
-		 * helps for Rage Mobilities that sometimes crash when
-		 * we switch to sclk. (Daniel Mantione, 13-05-2003)
+		 * SCLK has been started. Wait for the PLL to lock. 5 ms
+		 * should be enough according to mach64 programmer's guide.
 		 */
-		udelay(500);
+		mdelay(5);
 	}
 
 	aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par);