1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8aecb072466..dcc7ae6d414 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1334,10 +1334,16 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
         u32 reg;
         uint32_t DP = intel_dp->DP;
 
-        /* Enable output, wait for it to become active */
-        I915_WRITE(intel_dp->output_reg, intel_dp->DP);
-        POSTING_READ(intel_dp->output_reg);
-        intel_wait_for_vblank(dev, intel_crtc->pipe);
+        /*
+         * On CPT we have to enable the port in training pattern 1, which
+         * will happen below in intel_dp_set_link_train.  Otherwise, enable
+         * the port and wait for it to become active.
+         */
+        if (!HAS_PCH_CPT(dev)) {
+                I915_WRITE(intel_dp->output_reg, intel_dp->DP);
+                POSTING_READ(intel_dp->output_reg);
+                intel_wait_for_vblank(dev, intel_crtc->pipe);
+        }
 
         /* Write the link configuration data */
         intel_dp_aux_native_write(intel_dp, DP_LINK_BW_SET,