2 files changed, 27 insertions, 21 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 23d1ae67d279..7ef3e8b6864d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -306,6 +306,7 @@ static void i915_hotplug_work_func(struct work_struct *work)
         struct drm_mode_config *mode_config = &dev->mode_config;
         struct intel_encoder *encoder;
 
+        mutex_lock(&mode_config->mutex);
         DRM_DEBUG_KMS("running encoder hotplug functions\n");
 
         list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
@@ -314,6 +315,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
 
         /* Just fire off a uevent and let userspace tell us what to do */
         drm_helper_hpd_irq_event(dev);
+
+        mutex_unlock(&mode_config->mutex);
 }
 
 static void i915_handle_rps_change(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f797fb58ba9c..52b79d9d5d2d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -52,7 +52,7 @@ struct intel_dp {
         uint32_t color_range;
         uint8_t link_bw;
         uint8_t lane_count;
-        uint8_t dpcd[4];
+        uint8_t dpcd[8];
         struct i2c_adapter adapter;
         struct i2c_algo_dp_aux_data algo;
         bool is_pch_edp;
@@ -770,6 +770,7 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
         memset(intel_dp->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
         intel_dp->link_configuration[0] = intel_dp->link_bw;
         intel_dp->link_configuration[1] = intel_dp->lane_count;
+        intel_dp->link_configuration[8] = DP_SET_ANSI_8B10B;
 
         /*
          * Check for DPCD version > 1.1 and enhanced framing support
@@ -1597,10 +1598,22 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 }
 
 static enum drm_connector_status
+i915_dp_detect_common(struct intel_dp *intel_dp)
+{
+        enum drm_connector_status status = connector_status_disconnected;
+
+        if (intel_dp_aux_native_read_retry(intel_dp, 0x000, intel_dp->dpcd,
+                                           sizeof (intel_dp->dpcd)) &&
+            (intel_dp->dpcd[DP_DPCD_REV] != 0))
+                status = connector_status_connected;
+
+        return status;
+}
+
+static enum drm_connector_status
 ironlake_dp_detect(struct intel_dp *intel_dp)
 {
         enum drm_connector_status status;
-        bool ret;
 
         /* Can't disconnect eDP, but you can close the lid... */
         if (is_edp(intel_dp)) {
@@ -1610,15 +1623,7 @@ ironlake_dp_detect(struct intel_dp *intel_dp)
                 return status;
         }
 
-        status = connector_status_disconnected;
-        ret = intel_dp_aux_native_read_retry(intel_dp,
-                                             0x000, intel_dp->dpcd,
-                                             sizeof (intel_dp->dpcd));
-        if (ret && intel_dp->dpcd[DP_DPCD_REV] != 0)
-                status = connector_status_connected;
-        DRM_DEBUG_KMS("DPCD: %hx%hx%hx%hx\n", intel_dp->dpcd[0],
-                      intel_dp->dpcd[1], intel_dp->dpcd[2], intel_dp->dpcd[3]);
-        return status;
+        return i915_dp_detect_common(intel_dp);
 }
 
 static enum drm_connector_status
@@ -1626,7 +1631,6 @@ g4x_dp_detect(struct intel_dp *intel_dp)
 {
         struct drm_device *dev = intel_dp->base.base.dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
-        enum drm_connector_status status;
         uint32_t temp, bit;
 
         switch (intel_dp->output_reg) {
@@ -1648,15 +1652,7 @@ g4x_dp_detect(struct intel_dp *intel_dp)
         if ((temp & bit) == 0)
                 return connector_status_disconnected;
 
-        status = connector_status_disconnected;
-        if (intel_dp_aux_native_read(intel_dp, 0x000, intel_dp->dpcd,
-                                     sizeof (intel_dp->dpcd)) == sizeof (intel_dp->dpcd))
-        {
-                if (intel_dp->dpcd[DP_DPCD_REV] != 0)
-                        status = connector_status_connected;
-        }
-
-        return status;
+        return i915_dp_detect_common(intel_dp);
 }
 
 /**
@@ -1674,11 +1670,18 @@ intel_dp_detect(struct drm_connector *connector, bool force)
         struct edid *edid = NULL;
 
         intel_dp->has_audio = false;
+        memset(intel_dp->dpcd, 0, sizeof(intel_dp->dpcd));
 
         if (HAS_PCH_SPLIT(dev))
                 status = ironlake_dp_detect(intel_dp);
         else
                 status = g4x_dp_detect(intel_dp);
+
+        DRM_DEBUG_KMS("DPCD: %02hx%02hx%02hx%02hx%02hx%02hx%02hx%02hx\n",
+                      intel_dp->dpcd[0], intel_dp->dpcd[1], intel_dp->dpcd[2],
+                      intel_dp->dpcd[3], intel_dp->dpcd[4], intel_dp->dpcd[5],
+                      intel_dp->dpcd[6], intel_dp->dpcd[7]);
+
         if (status != connector_status_connected)
                 return status;