intelfb: fixup p calculation

This fixes up the p calculation of p1 and p2 for the i9xx chipsets.
This seems to work a lot better for lower pixel clocks..
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/video/intelfb/intelfb.h

@@ -286,7 +286,7 @@ struct intelfb_info {
 	int pll_index;
 };
 
-#define IS_I9xx(dinfo) (((dinfo)->chipset == INTEL_915G)||(dinfo->chipset == INTEL_915GM)||((dinfo)->chipset == INTEL_945G)||(dinfo->chipset==INTEL_945GM))
+#define IS_I9XX(dinfo) (((dinfo)->chipset == INTEL_915G)||(dinfo->chipset == INTEL_915GM)||((dinfo)->chipset == INTEL_945G)||(dinfo->chipset==INTEL_945GM))
 
 /*** function prototypes ***/
 

drivers/video/intelfb/intelfbdrv.c

@@ -1480,7 +1480,7 @@ intelfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 	intelfbhw_cursor_hide(dinfo);
 
 	/* If XFree killed the cursor - restore it */
-	physical = (dinfo->mobile || IS_I9xx(dinfo)) ? dinfo->cursor.physical :
+	physical = (dinfo->mobile || IS_I9XX(dinfo)) ? dinfo->cursor.physical :
 		   (dinfo->cursor.offset << 12);
 
 	if (INREG(CURSOR_A_BASEADDR) != physical) {

drivers/video/intelfb/intelfbhw.h

@@ -133,6 +133,7 @@
 #define DPLL_VGA_MODE_DISABLE		(1 << 28)
 #define DPLL_P2_MASK			1
 #define DPLL_P2_SHIFT			23
+#define DPLL_I9XX_P2_SHIFT              24
 #define DPLL_P1_FORCE_DIV2		(1 << 21)
 #define DPLL_P1_MASK			0x1f
 #define DPLL_P1_SHIFT			16