1 files changed, 15 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index e16ac5a28c3c..22ff38455731 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -217,7 +217,8 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 {
         struct drm_device *dev = connector->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
-        u32 hotplug_en;
+        u32 hotplug_en, orig, stat;
+        bool ret = false;
         int i, tries = 0;
 
         if (HAS_PCH_SPLIT(dev))
@@ -232,8 +233,8 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector)
                 tries = 2;
         else
                 tries = 1;
-        hotplug_en = I915_READ(PORT_HOTPLUG_EN);
-        hotplug_en &= CRT_FORCE_HOTPLUG_MASK;
+        hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
+        hotplug_en &= CRT_HOTPLUG_MASK;
         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 
         if (IS_G4X(dev))
@@ -255,11 +256,17 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector)
                 } while (time_after(timeout, jiffies));
         }
 
-        if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
-            CRT_HOTPLUG_MONITOR_NONE)
-                return true;
+        stat = I915_READ(PORT_HOTPLUG_STAT);
+        if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
+                ret = true;
+
+        /* clear the interrupt we just generated, if any */
+        I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 
-        return false;
+        /* and put the bits back */
+        I915_WRITE(PORT_HOTPLUG_EN, orig);
+
+        return ret;
 }
 
 static bool intel_crt_detect_ddc(struct drm_encoder *encoder)
@@ -569,7 +576,7 @@ void intel_crt_init(struct drm_device *dev)
                                    (1 << INTEL_ANALOG_CLONE_BIT) |
                                    (1 << INTEL_SDVO_LVDS_CLONE_BIT);
         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
-        connector->interlace_allowed = 0;
+        connector->interlace_allowed = 1;
         connector->doublescan_allowed = 0;
 
         drm_encoder_helper_add(&intel_encoder->enc, &intel_crt_helper_funcs);