drm/i915: emit a hotplug event on resume

This will poke userspace into probing for configuration changes that may
have occurred across suspend/resume.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index bf57e1cc88b1..0cfc778aa759 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -545,6 +545,24 @@ void intel_console_resume(struct work_struct *work)
         console_unlock();
 }
 
+static void intel_resume_hotplug(struct drm_device *dev)
+{
+        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)
+                if (encoder->hot_plug)
+                        encoder->hot_plug(encoder);
+
+        mutex_unlock(&mode_config->mutex);
+
+        /* Just fire off a uevent and let userspace tell us what to do */
+        drm_helper_hpd_irq_event(dev);
+}
+
 static int __i915_drm_thaw(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -580,6 +598,8 @@ static int __i915_drm_thaw(struct drm_device *dev)
                  * */
                 intel_hpd_init(dev);
                 dev_priv->enable_hotplug_processing = true;
+                /* Config may have changed between suspend and resume */
+                intel_resume_hotplug(dev);
         }
 
         intel_opregion_init(dev);