drm/i915: Require digital monitor on HDMI ports for detect

HDMI and DVI both require DDC/EDID on monitors, so use
that to know when a monitor is connected as the hot-plug
pins are shared with SDVO and DisplayPort

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 16 insertions, 14 deletions

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 4ea2a651b92c..2495359ea8de 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -31,6 +31,7 @@
 #include "drmP.h"
 #include "drm.h"
 #include "drm_crtc.h"
+#include "drm_edid.h"
 #include "intel_drv.h"
 #include "i915_drm.h"
 #include "i915_drv.h"
@@ -129,20 +130,26 @@ static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
         return true;
 }
 
-static void
-intel_hdmi_sink_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_hdmi_edid_detect(struct drm_connector *connector)
 {
         struct intel_output *intel_output = to_intel_output(connector);
         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
         struct edid *edid = NULL;
+        enum drm_connector_status status = connector_status_disconnected;
 
         edid = drm_get_edid(&intel_output->base,
                             &intel_output->ddc_bus->adapter);
-        if (edid != NULL) {
-                hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
-                kfree(edid);
+        hdmi_priv->has_hdmi_sink = false;
+        if (edid) {
+                if (edid->digital) {
+                        status = connector_status_connected;
+                        hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
+                }
                 intel_output->base.display_info.raw_edid = NULL;
+                kfree(edid);
         }
+        return status;
 }
 
 static enum drm_connector_status
@@ -154,11 +161,7 @@ igdng_hdmi_detect(struct drm_connector *connector)
         /* FIXME hotplug detect */
 
         hdmi_priv->has_hdmi_sink = false;
-        intel_hdmi_sink_detect(connector);
-        if (hdmi_priv->has_hdmi_sink)
-                return connector_status_connected;
-        else
-                return connector_status_disconnected;
+        return intel_hdmi_edid_detect(connector);
 }
 
 static enum drm_connector_status
@@ -201,10 +204,9 @@ intel_hdmi_detect(struct drm_connector *connector)
                 return connector_status_unknown;
         }
 
-        if ((I915_READ(PORT_HOTPLUG_STAT) & bit) != 0) {
-                intel_hdmi_sink_detect(connector);
-                return connector_status_connected;
-        } else
+        if ((I915_READ(PORT_HOTPLUG_STAT) & bit) != 0)
+                return intel_hdmi_edid_detect(connector);
+        else
                 return connector_status_disconnected;
 }