diff --git a/drivers/gpu/drm/radeon/rs400.c b/drivers/gpu/drm/radeon/rs400.c
index 8d12b8a1ff13ef8841f73ca9bd09c8555daf3bbb..eda6d757b5c45f8a8ee3c9d51d037a1a1399b0f0 100644
--- a/drivers/gpu/drm/radeon/rs400.c
+++ b/drivers/gpu/drm/radeon/rs400.c
@@ -352,7 +352,7 @@ static int rs400_mc_init(struct radeon_device *rdev)
 	u32 tmp;
 
 	/* Setup GPU memory space */
-	tmp = G_00015C_MC_FB_START(RREG32(R_00015C_NB_TOM));
+	tmp = RREG32(R_00015C_NB_TOM);
 	rdev->mc.vram_location = G_00015C_MC_FB_START(tmp) << 16;
 	rdev->mc.gtt_location = 0xFFFFFFFFUL;
 	r = radeon_mc_setup(rdev);
diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 3be456b781915d9d939534b4c09011c94ba77ec0..84b26376027d4d16669e996a3e01f0a2dba36902 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -48,11 +48,12 @@ int rs600_mc_wait_for_idle(struct radeon_device *rdev);
 int rs600_mc_init(struct radeon_device *rdev)
 {
 	/* read back the MC value from the hw */
-	uint32_t mc_fb_loc;
 	int r;
+	u32 tmp;
 
-	mc_fb_loc = RREG32_MC(R_000004_MC_FB_LOCATION);
-	rdev->mc.vram_location = G_000004_MC_FB_START(mc_fb_loc) << 16;
+	/* Setup GPU memory space */
+	tmp = RREG32_MC(R_000004_MC_FB_LOCATION);
+	rdev->mc.vram_location = G_000004_MC_FB_START(tmp) << 16;
 	rdev->mc.gtt_location = 0xffffffffUL;
 	r = radeon_mc_setup(rdev);
 	if (r)
diff --git a/drivers/gpu/drm/radeon/rs690.c b/drivers/gpu/drm/radeon/rs690.c
index 30913c3b5ba1fdafd5d820ccc7471ba4424cde6c..eb486ee7ea00fc252476b7367b5127345484e113 100644
--- a/drivers/gpu/drm/radeon/rs690.c
+++ b/drivers/gpu/drm/radeon/rs690.c
@@ -162,6 +162,21 @@ void rs690_vram_info(struct radeon_device *rdev)
 	rdev->pm.core_bandwidth.full = rfixed_div(rdev->pm.sclk, a);
 }
 
+static int rs690_mc_init(struct radeon_device *rdev)
+{
+	int r;
+	u32 tmp;
+
+	/* Setup GPU memory space */
+	tmp = RREG32_MC(R_000100_MCCFG_FB_LOCATION);
+	rdev->mc.vram_location = G_000100_MC_FB_START(tmp) << 16;
+	rdev->mc.gtt_location = 0xFFFFFFFFUL;
+	r = radeon_mc_setup(rdev);
+	if (r)
+		return r;
+	return 0;
+}
+
 void rs690_line_buffer_adjust(struct radeon_device *rdev,
 			      struct drm_display_mode *mode1,
 			      struct drm_display_mode *mode2)
@@ -710,7 +725,7 @@ int rs690_init(struct radeon_device *rdev)
 	/* Get vram informations */
 	rs690_vram_info(rdev);
 	/* Initialize memory controller (also test AGP) */
-	r = r420_mc_init(rdev);
+	r = rs690_mc_init(rdev);
 	if (r)
 		return r;
 	rv515_debugfs(rdev);