diff --git a/drivers/char/drm/radeon_cp.c b/drivers/char/drm/radeon_cp.c
index b517ae515801bb39260d398e784d703979435d0c..342302d4674352f85f63b5fa9847b25e98129bd2 100644
--- a/drivers/char/drm/radeon_cp.c
+++ b/drivers/char/drm/radeon_cp.c
@@ -1312,8 +1312,6 @@ static void radeon_set_pcigart(drm_radeon_private_t * dev_priv, int on)
 static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
 {
 	drm_radeon_private_t *dev_priv = dev->dev_private;
-	unsigned int mem_size, aper_size;
-
 	DRM_DEBUG("\n");
 
 	dev_priv->is_pci = init->is_pci;
@@ -1523,13 +1521,8 @@ static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
 					  + dev_priv->fb_location) >> 10));
 
 	dev_priv->gart_size = init->gart_size;
-
-	mem_size = RADEON_READ(RADEON_CONFIG_MEMSIZE);
-	if (mem_size == 0)
-		mem_size = 0x800000;
-	aper_size = max(RADEON_READ(RADEON_CONFIG_APER_SIZE), mem_size);
-
-	dev_priv->gart_vm_start = dev_priv->fb_location + aper_size;
+	dev_priv->gart_vm_start = dev_priv->fb_location
+	    + RADEON_READ(RADEON_CONFIG_APER_SIZE);
 
 #if __OS_HAS_AGP
 	if (!dev_priv->is_pci)