drm: Initialize the AGP structure's base address at init rather than enable.

Not all drivers call enable (intel), but they would still like to use this
member in driver code.
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/drm_agpsupport.c

@@ -166,7 +166,6 @@ int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
 
 	dev->agp->mode = mode.mode;
 	agp_enable(dev->agp->bridge, mode.mode);
-	dev->agp->base = dev->agp->agp_info.aper_base;
 	dev->agp->enabled = 1;
 	return 0;
 }
@@ -417,7 +416,7 @@ struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 	INIT_LIST_HEAD(&head->memory);
 	head->cant_use_aperture = head->agp_info.cant_use_aperture;
 	head->page_mask = head->agp_info.page_mask;
-
+	head->base = head->agp_info.aper_base;
 	return head;
 }
 

drivers/char/drm/i915_dma.c

@@ -757,7 +757,7 @@ static int i915_set_status_page(struct drm_device *dev, void *data,
 
 	dev_priv->status_gfx_addr = hws->addr & (0x1ffff<<12);
 
-	dev_priv->hws_map.offset = dev->agp->agp_info.aper_base + hws->addr;
+	dev_priv->hws_map.offset = dev->agp->base + hws->addr;
 	dev_priv->hws_map.size = 4*1024;
 	dev_priv->hws_map.type = 0;
 	dev_priv->hws_map.flags = 0;