drm/radeon/kms/r600: fix rs880 support v2

Lots of cases were wrong or missing.

v2: rebased against drm-next

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 1c9a9c4..0507224 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -277,7 +277,8 @@
 				ATOM_DEVICE_CV_SUPPORT)
 				continue;
 
-			if ((rdev->family == CHIP_RS780) &&
+			/* IGP chips */
+			if ((rdev->flags & RADEON_IS_IGP) &&
 			    (con_obj_id ==
 			     CONNECTOR_OBJECT_ID_PCIE_CONNECTOR)) {
 				uint16_t igp_offset = 0;