drm/i915: Fix hpd live status bits for g4x

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

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 81cdd9ff38922397171e91558136ae0765229106..4b8ed9f2dabc7ae9e9f3bb8f3b14c775096638b7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1374,21 +1374,30 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
        struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        bool live_status = false;
-       unsigned int retry = 3;
+       unsigned int try;
 
        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);
 
        intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
 
-       while (!live_status && --retry) {
+       for (try = 0; !live_status && try < 9; try++) {
+               if (try)
+                       msleep(10);
                live_status = intel_digital_port_connected(dev_priv,
                                hdmi_to_dig_port(intel_hdmi));
-               mdelay(10);
        }
 
-       if (!live_status)
-               DRM_DEBUG_KMS("Live status not up!");
+       if (!live_status) {
+               DRM_DEBUG_KMS("HDMI live status down\n");
+               /*
+                * Live status register is not reliable on all intel platforms.
+                * So consider live_status only for certain platforms, for
+                * others, read EDID to determine presence of sink.
+                */
+               if (INTEL_INFO(dev_priv)->gen < 7 || IS_IVYBRIDGE(dev_priv))
+                       live_status = true;
+       }
 
        intel_hdmi_unset_edid(connector);