drm/i915: Refresh cached DP port register value on resume

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / i915 / intel_dp.c

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e55a82a99e7f6ec5c182eaec2f300fb354536b3b..94e6b4ec54c52c437040af4a1f80e9e1a8a97e9e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5079,13 +5079,15 @@ static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp)
 
 void intel_dp_encoder_reset(struct drm_encoder *encoder)
 {
-       struct intel_dp *intel_dp;
+       struct drm_i915_private *dev_priv = to_i915(encoder->dev);
+       struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+       if (!HAS_DDI(dev_priv))
+               intel_dp->DP = I915_READ(intel_dp->output_reg);
 
        if (to_intel_encoder(encoder)->type != INTEL_OUTPUT_EDP)
                return;
 
-       intel_dp = enc_to_intel_dp(encoder);
-
        pps_lock(intel_dp);
 
        /*