diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index f905aa36e19c..938ca72fc9c3 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -901,6 +901,7 @@ static void parse_hdmi_forum_scds(struct rockchip_drm_hdmi21_data *hdmi21_data,
 
 		DRM_DEBUG_KMS("hdmi_21 sink detected. parsing edid\n");
 		max_frl_rate = (hf_scds[7] & DRM_EDID_MAX_FRL_RATE_MASK) >> 4;
+		hdmi21_data->allm_supported = hf_scds[8] & DRM_EDID_ALLM;
 		get_max_frl_rate(max_frl_rate, &hdmi21_data->max_lanes,
 				 &hdmi21_data->max_frl_rate_per_lane);
 		hdmi21_data->dsc_cap.v_1p2 = hf_scds[11] & DRM_EDID_DSC_1P2;