intel-agp: Fix i830 mask variable that changed with G33 support

The mask on i830 should be 0x70 always, later chips 0xF0 should be okay.
Signed-off-by: NDave Airlie <airlied@linux.ie>
Acked-by: NZhenyu Wang <zhenyu.z.wang@intel.com>
Cc: Michael Haas <laga@laga.ath.cx>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/agp/agp.h

@@ -176,7 +176,7 @@ struct agp_bridge_data {
 #define I830_GMCH_MEM_MASK		0x1
 #define I830_GMCH_MEM_64M		0x1
 #define I830_GMCH_MEM_128M		0
-#define I830_GMCH_GMS_MASK		0xF0
+#define I830_GMCH_GMS_MASK		0x70
 #define I830_GMCH_GMS_DISABLED		0x00
 #define I830_GMCH_GMS_LOCAL		0x10
 #define I830_GMCH_GMS_STOLEN_512	0x20
@@ -190,6 +190,7 @@ struct agp_bridge_data {
 #define INTEL_I830_ERRSTS	0x92
 
 /* Intel 855GM/852GM registers */
+#define I855_GMCH_GMS_MASK		0xF0
 #define I855_GMCH_GMS_STOLEN_0M		0x0
 #define I855_GMCH_GMS_STOLEN_1M		(0x1 << 4)
 #define I855_GMCH_GMS_STOLEN_4M		(0x2 << 4)

drivers/char/agp/intel-agp.c

@@ -511,7 +511,7 @@ static void intel_i830_init_gtt_entries(void)
 		 */
 		if (IS_G33)
 			size = 0;
-		switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
+		switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
 		case I855_GMCH_GMS_STOLEN_1M:
 			gtt_entries = MB(1) - KB(size);
 			break;