diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a8d4e23aba45baf51e9f364c8f32fb7f99030a49..c3dbaaed2ff965f785c6989eadbcdf9d4bc1ccc5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -76,6 +76,14 @@ enum transcoder {
 };
 #define transcoder_name(t) ((t) + 'A')
 
+/*
+ * This is the maximum (across all platforms) number of planes (primary +
+ * sprites) that can be active at the same time on one pipe.
+ *
+ * This value doesn't count the cursor plane.
+ */
+#define I915_MAX_PLANES	3
+
 enum plane {
 	PLANE_A = 0,
 	PLANE_B,