From a9b9185e0b125e0fd6f2182d75c4e9b369e2640e Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Fri, 2 Nov 2012 11:14:00 -0700
Subject: [PATCH] --- yaml --- r: 345282 b: refs/heads/master c:
 1a01ab3b2dc4394c46c4c3230805748f632f6f74 h: refs/heads/master v: v3

---
 [refs]                                |  2 +-
 trunk/drivers/gpu/drm/i915/i915_drv.c |  2 ++
 trunk/drivers/gpu/drm/i915/i915_drv.h |  2 ++
 trunk/drivers/gpu/drm/i915/intel_pm.c | 29 +++++++++++++++++++++++++--
 4 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index c0a65c9f6bd3..47759522bf33 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 073f34d9d49bdbadbea8198ddc3fbb7e736a94dd
+refs/heads/master: 1a01ab3b2dc4394c46c4c3230805748f632f6f74
diff --git a/trunk/drivers/gpu/drm/i915/i915_drv.c b/trunk/drivers/gpu/drm/i915/i915_drv.c
index cfd8920537c5..577858bd0809 100644
--- a/trunk/drivers/gpu/drm/i915/i915_drv.c
+++ b/trunk/drivers/gpu/drm/i915/i915_drv.c
@@ -474,6 +474,8 @@ static int i915_drm_freeze(struct drm_device *dev)
 			return error;
 		}
 
+		cancel_delayed_work_sync(&dev_priv->rps.delayed_resume_work);
+
 		intel_modeset_disable(dev);
 
 		drm_irq_uninstall(dev);
diff --git a/trunk/drivers/gpu/drm/i915/i915_drv.h b/trunk/drivers/gpu/drm/i915/i915_drv.h
index f8fa63deb92c..8db7bb9899b9 100644
--- a/trunk/drivers/gpu/drm/i915/i915_drv.h
+++ b/trunk/drivers/gpu/drm/i915/i915_drv.h
@@ -562,6 +562,8 @@ struct intel_gen6_power_mgmt {
 	u8 cur_delay;
 	u8 min_delay;
 	u8 max_delay;
+
+	struct delayed_work delayed_resume_work;
 };
 
 struct intel_ilk_power_mgmt {
diff --git a/trunk/drivers/gpu/drm/i915/intel_pm.c b/trunk/drivers/gpu/drm/i915/intel_pm.c
index b6d980b0ac4c..169b416430db 100644
--- a/trunk/drivers/gpu/drm/i915/intel_pm.c
+++ b/trunk/drivers/gpu/drm/i915/intel_pm.c
@@ -3304,23 +3304,46 @@ static void intel_init_emon(struct drm_device *dev)
 
 void intel_disable_gt_powersave(struct drm_device *dev)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
 	if (IS_IRONLAKE_M(dev)) {
 		ironlake_disable_drps(dev);
 		ironlake_disable_rc6(dev);
 	} else if (INTEL_INFO(dev)->gen >= 6 && !IS_VALLEYVIEW(dev)) {
+		cancel_delayed_work_sync(&dev_priv->rps.delayed_resume_work);
 		gen6_disable_rps(dev);
 	}
 }
 
+static void intel_gen6_powersave_work(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private,
+			     rps.delayed_resume_work.work);
+	struct drm_device *dev = dev_priv->dev;
+
+	mutex_lock(&dev->struct_mutex);
+	gen6_enable_rps(dev);
+	gen6_update_ring_freq(dev);
+	mutex_unlock(&dev->struct_mutex);
+}
+
 void intel_enable_gt_powersave(struct drm_device *dev)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
 	if (IS_IRONLAKE_M(dev)) {
 		ironlake_enable_drps(dev);
 		ironlake_enable_rc6(dev);
 		intel_init_emon(dev);
 	} else if ((IS_GEN6(dev) || IS_GEN7(dev)) && !IS_VALLEYVIEW(dev)) {
-		gen6_enable_rps(dev);
-		gen6_update_ring_freq(dev);
+		/*
+		 * PCU communication is slow and this doesn't need to be
+		 * done at any specific time, so do this out of our fast path
+		 * to make resume and init faster.
+		 */
+		schedule_delayed_work(&dev_priv->rps.delayed_resume_work,
+				      round_jiffies_up_relative(HZ));
 	}
 }
 
@@ -4216,6 +4239,8 @@ void intel_gt_init(struct drm_device *dev)
 		dev_priv->gt.force_wake_get = __gen6_gt_force_wake_get;
 		dev_priv->gt.force_wake_put = __gen6_gt_force_wake_put;
 	}
+	INIT_DELAYED_WORK(&dev_priv->rps.delayed_resume_work,
+			  intel_gen6_powersave_work);
 }
 
 int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u8 mbox, u32 *val)