diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 103a60b3cad4775d5db338ca682e552534953d48..208a4ec3e432bfa87fa69d21fecf6b4a989d44e4 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1366,14 +1366,13 @@ intel_dp_link_down(struct intel_dp *intel_dp)
 	if (HAS_PCH_CPT(dev) && !IS_eDP(intel_dp)) {
 		DP &= ~DP_LINK_TRAIN_MASK_CPT;
 		I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT);
-		POSTING_READ(intel_dp->output_reg);
 	} else {
 		DP &= ~DP_LINK_TRAIN_MASK;
 		I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
-		POSTING_READ(intel_dp->output_reg);
 	}
+	POSTING_READ(intel_dp->output_reg);
 
-	udelay(17000);
+	msleep(17);
 
 	if (IS_eDP(intel_dp))
 		DP |= DP_LINK_TRAIN_OFF;