drm/i915: Don't let update_psr function actually enable PSR.

Being more conservative by enabling PSR only on psr_enable function.
Reviewed-by: NVijay Purushothaman <vijay.a.purushothaman@intel.com>
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -1805,9 +1805,6 @@ static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
 	    intel_edp_is_psr_enabled(dev))
 		return;
 
-	/* Setup PSR once */
-	intel_edp_psr_setup(intel_dp);
-
 	/* Enable PSR on the panel */
 	intel_edp_psr_enable_sink(intel_dp);
 
@@ -1824,6 +1821,9 @@ void intel_edp_psr_enable(struct intel_dp *intel_dp)
 		return;
 	}
 
+	/* Setup PSR once */
+	intel_edp_psr_setup(intel_dp);
+
 	if (intel_edp_psr_match_conditions(intel_dp) &&
 	    !intel_edp_is_psr_enabled(dev))
 		intel_edp_psr_do_enable(intel_dp);
@@ -1848,12 +1848,16 @@ void intel_edp_psr_disable(struct intel_dp *intel_dp)
 
 void intel_edp_psr_update(struct drm_device *dev)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_encoder *encoder;
 	struct intel_dp *intel_dp = NULL;
 
 	if (!HAS_PSR(dev))
 		return;
 
+	if (!dev_priv->psr.setup_done)
+		return;
+
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head)
 		if (encoder->type == INTEL_OUTPUT_EDP) {
 			intel_dp = enc_to_intel_dp(&encoder->base);