drm/ati_pcigart: fix the PCIGART to use drm_pci to allocate GART table.

This fixes a problem on 64-bit with 4GB with ATI RS690 chipsets. It
makes sure the pcigart table is allocated in coherent memory for DMA operations.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/char/drm/r128_cce.c b/drivers/char/drm/r128_cce.c
index 892e0a5..f36adbd 100644
--- a/drivers/char/drm/r128_cce.c
+++ b/drivers/char/drm/r128_cce.c
@@ -558,6 +558,7 @@
 #if __OS_HAS_AGP
 	if (dev_priv->is_pci) {
 #endif
+		dev_priv->gart_info.table_mask = DMA_BIT_MASK(32);
 		dev_priv->gart_info.gart_table_location = DRM_ATI_GART_MAIN;
 		dev_priv->gart_info.table_size = R128_PCIGART_TABLE_SIZE;
 		dev_priv->gart_info.addr = NULL;