diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h
index e69cece404b3c..763d45a612f35 100644
--- a/include/drm/display/drm_dp.h
+++ b/include/drm/display/drm_dp.h
@@ -148,6 +148,7 @@
 #define DP_RECEIVE_PORT_0_CAP_0		    0x008
 # define DP_LOCAL_EDID_PRESENT		    (1 << 1)
 # define DP_ASSOCIATED_TO_PRECEDING_PORT    (1 << 2)
+# define DP_HBLANK_EXPANSION_CAPABLE        (1 << 3)
 
 #define DP_RECEIVE_PORT_0_BUFFER_SIZE	    0x009
 
@@ -699,6 +700,7 @@
 
 #define DP_DSC_ENABLE                       0x160   /* DP 1.4 */
 # define DP_DECOMPRESSION_EN                (1 << 0)
+# define DP_DSC_PASSTHROUGH_EN		    (1 << 1)
 #define DP_DSC_CONFIGURATION				0x161	/* DP 2.0 */
 
 #define DP_PSR_EN_CFG				0x170   /* XXX 1.2? */