From 567d168b63d59f646e9a95a301950d0688736d08 Mon Sep 17 00:00:00 2001
From: Ben Widawsky <ben@bwidawsk.net>
Date: Thu, 9 Feb 2012 10:15:20 +0100
Subject: [PATCH] --- yaml --- r: 293592 b: refs/heads/master c:
 67a3744f7515edda9888df5b226ec3b358908b42 h: refs/heads/master v: v3

---
 [refs]                                |  2 +-
 trunk/drivers/gpu/drm/i915/i915_drv.c | 15 ++++++++++++---
 trunk/drivers/gpu/drm/i915/i915_drv.h |  2 +-
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/[refs] b/[refs]
index c2dda5dd1ce8..a75dae9b054f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ee64cbdbf617067988168a4a49fcaabdd2743da6
+refs/heads/master: 67a3744f7515edda9888df5b226ec3b358908b42
diff --git a/trunk/drivers/gpu/drm/i915/i915_drv.c b/trunk/drivers/gpu/drm/i915/i915_drv.c
index d783e2b4c914..0694e170a338 100644
--- a/trunk/drivers/gpu/drm/i915/i915_drv.c
+++ b/trunk/drivers/gpu/drm/i915/i915_drv.c
@@ -421,8 +421,10 @@ void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
 	spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags);
 }
 
-void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
+int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
 {
+	int ret = 0;
+
 	if (dev_priv->gt_fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
 		int loop = 500;
 		u32 fifo = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
@@ -430,10 +432,13 @@ void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
 			udelay(10);
 			fifo = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
 		}
-		WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES);
+		if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
+			++ret;
 		dev_priv->gt_fifo_count = fifo;
 	}
 	dev_priv->gt_fifo_count--;
+
+	return ret;
 }
 
 static int i915_drm_freeze(struct drm_device *dev)
@@ -1001,11 +1006,15 @@ __i915_read(64, q)
 
 #define __i915_write(x, y) \
 void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
+	u32 __fifo_ret = 0; \
 	trace_i915_reg_rw(true, reg, val, sizeof(val)); \
 	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
-		__gen6_gt_wait_for_fifo(dev_priv); \
+		__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 	} \
 	write##y(val, dev_priv->regs + reg); \
+	if (unlikely(__fifo_ret)) { \
+		gen6_gt_check_fifodbg(dev_priv); \
+	} \
 }
 __i915_write(8, b)
 __i915_write(16, w)
diff --git a/trunk/drivers/gpu/drm/i915/i915_drv.h b/trunk/drivers/gpu/drm/i915/i915_drv.h
index 922aed33035d..000a9ad17ddd 100644
--- a/trunk/drivers/gpu/drm/i915/i915_drv.h
+++ b/trunk/drivers/gpu/drm/i915/i915_drv.h
@@ -1401,7 +1401,7 @@ extern void intel_display_print_error_state(struct seq_file *m,
  */
 void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv);
 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv);
-void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);
+int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);
 
 /* We give fast paths for the really cool registers */
 #define NEEDS_FORCE_WAKE(dev_priv, reg) \