[Intel-gfx] [PATCH 1/2] drm/i915: Call encoder hotplug for init and resume cases

[Sonika Jindal]

Call the encoders, call the hot_plug if it is registered.
This is required for connected boot and resume cases to generate
fake hpd resulting in reading of edid.
Removing the initial sdvo hot_plug call too so that it will be called
just once from this loop.

v2: Schedule a work function to call hot_plug. On CHT, it runs into a
deadlock if we call ->hot_plug inside hpd_init. This is because, hot_plug
calls set_edid which tries to acquire the power domain and if power
well is disabled, we enable power well and call hpd_init again.
So, schedule a work function from here to call hot_plug and run a
detect cycle.

Cc: Shashank Sharma <shashank.sharma at intel.com>
Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>
---

 drivers/gpu/drm/i915/i915_drv.h      |  1 +
 drivers/gpu/drm/i915/intel_hotplug.c | 26 ++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_sdvo.c    |  1 -
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bc865e23..4f037b9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -228,6 +228,7 @@ enum hpd_pin {
 
 struct i915_hotplug {
 	struct work_struct hotplug_work;
+	struct work_struct edid_work;
 
 	struct {
 		unsigned long last_jiffies;
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index b177857..72d8fe8 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -442,6 +442,24 @@ void intel_hpd_irq_handler(struct drm_device *dev,
 		schedule_work(&dev_priv->hotplug.hotplug_work);
 }
 
+static void i915_edid_work_func(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private, hotplug.edid_work);
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_encoder *encoder;
+
+	mutex_lock(&mode_config->mutex);
+	list_for_each_entry(encoder, &mode_config->encoder_list,
+			base.head) {
+		if (encoder->hot_plug)
+			encoder->hot_plug(encoder);
+	}
+	mutex_unlock(&mode_config->mutex);
+	drm_helper_hpd_irq_event(dev);
+}
+
 /**
  * intel_hpd_init - initializes and enables hpd support
  * @dev_priv: i915 device instance
@@ -482,12 +500,19 @@ void intel_hpd_init(struct drm_i915_private *dev_priv)
 	if (dev_priv->display.hpd_irq_setup)
 		dev_priv->display.hpd_irq_setup(dev);
 	spin_unlock_irq(&dev_priv->irq_lock);
+
+	/*
+	 * Connected boot / resume scenarios can't generate new hot plug.
+	 * So, probe it manually.
+	 */
+	schedule_work(&dev_priv->hotplug.edid_work);
 }
 
 void intel_hpd_init_work(struct drm_i915_private *dev_priv)
 {
 	INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
 	INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
+	INIT_WORK(&dev_priv->hotplug.edid_work, i915_edid_work_func);
 	INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
 			  intel_hpd_irq_storm_reenable_work);
 }
@@ -504,5 +529,6 @@ void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
 
 	cancel_work_sync(&dev_priv->hotplug.dig_port_work);
 	cancel_work_sync(&dev_priv->hotplug.hotplug_work);
+	cancel_work_sync(&dev_priv->hotplug.edid_work);
 	cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
 }
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 06679f1..4238a02 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -2466,7 +2466,6 @@ intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
 		 * Ensure that they get re-enabled when an interrupt happens.
 		 */
 		intel_encoder->hot_plug = intel_sdvo_enable_hotplug;
-		intel_sdvo_enable_hotplug(intel_encoder);
 	} else {
 		intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 	}
-- 
1.9.1