1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1d8d068bc473..df648cb4c296 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1374,9 +1374,11 @@ intel_dp_link_down(struct intel_dp *intel_dp)
 {
         struct drm_device *dev = intel_dp->base.base.dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
-        struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.base.crtc);
         uint32_t DP = intel_dp->DP;
 
+        if ((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0)
+                return;
+
         DRM_DEBUG_KMS("\n");
 
         if (is_edp(intel_dp)) {
@@ -1400,7 +1402,9 @@ intel_dp_link_down(struct intel_dp *intel_dp)
         if (is_edp(intel_dp))
                 DP |= DP_LINK_TRAIN_OFF;
 
-        if (!HAS_PCH_CPT(dev) && (DP & DP_PIPEB_SELECT)) {
+        if (!HAS_PCH_CPT(dev) &&
+            I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) {
+                struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.base.crtc);
                 /* Hardware workaround: leaving our transcoder select
                  * set to transcoder B while it's off will prevent the
                  * corresponding HDMI output on transcoder A.