2 files changed, 3 insertions, 2 deletions

diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h
index 35ab1a9f8e8b..8955e7ff759a 100644
--- a/drivers/char/agp/agp.h
+++ b/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)
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 7c69bf259caa..a5d0e95a227a 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/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;