drm/radeon/kms: add cayman asic reset support

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/nid.h b/drivers/gpu/drm/radeon/nid.h
index 57062f1..0f9a08b 100644
--- a/drivers/gpu/drm/radeon/nid.h
+++ b/drivers/gpu/drm/radeon/nid.h
@@ -42,6 +42,7 @@
 #define CAYMAN_MAX_TCC_MASK          0xFF
 
 #define DMIF_ADDR_CONFIG  				0xBD4
+#define	SRBM_STATUS				        0x0E50
 
 #define VM_CONTEXT0_REQUEST_RESPONSE			0x1470
 #define		REQUEST_TYPE(x)					(((x) & 0xf) << 0)