Revert "drm/i915: Call encoder hotplug for init and resume cases"

This reverts commit 5d250b05918c002b63632c7db91c3c5f924c6a3b.

It results on a deadlock on platforms where we need to (at least
partially) re-init hpd interrupts from power domain code, since
->hot_plug might again grab a power well reference (to do edid/dp_aux
transactions. At least chv is affected.

Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
References: http://mid.gmane.org/20151008133548.GX26517@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

drivers/gpu/drm/i915/intel_hotplug.c

@@ -458,7 +458,6 @@ void intel_hpd_init(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;
 	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct intel_encoder *encoder;
 	struct drm_connector *connector;
 	int i;
 
@@ -483,16 +482,6 @@ void intel_hpd_init(struct drm_i915_private *dev_priv)
 	if (dev_priv->display.hpd_irq_setup)
 		dev_priv->display.hpd_irq_setup(dev);
 	spin_unlock_irq(&dev_priv->irq_lock);
-
-	/*
-	 * Connected boot / resume scenarios can't generate new hot plug.
-	 * So, probe it manually.
-	 */
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
-			    base.head) {
-		if (encoder->hot_plug)
-			encoder->hot_plug(encoder);
-	}
 }
 
 void intel_hpd_init_work(struct drm_i915_private *dev_priv)

drivers/gpu/drm/i915/intel_sdvo.c

@@ -2460,6 +2460,7 @@ intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
 		 * Ensure that they get re-enabled when an interrupt happens.
 		 */
 		intel_encoder->hot_plug = intel_sdvo_enable_hotplug;
+		intel_sdvo_enable_hotplug(intel_encoder);
 	} else {
 		intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 	}