diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 81eb36f..7efcb31 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4565,6 +4565,7 @@
 #define   GLK_CL0_PWR_DOWN		REG_BIT(10)
 
 #define CHICKEN_MISC_3		_MMIO(0x42088)
+#define   DP_MST_DPT_DPTP_ALIGN_WA(trans)	REG_BIT(9 + (trans) - TRANSCODER_A)
 #define   DP_MST_SHORT_HBLANK_WA(trans)		REG_BIT(5 + (trans) - TRANSCODER_A)
 #define   DP_MST_FEC_BS_JITTER_WA(trans)	REG_BIT(0 + (trans) - TRANSCODER_A)