2 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e52a277814c0..134973f77069 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4725,6 +4725,11 @@ i915_gem_init_ringbuffer(struct drm_device *dev)
                         ring->space += ring->Size;
         }
 
+        if (IS_I9XX(dev) && !IS_GEN3(dev)) {
+                I915_WRITE(MI_MODE,
+                           (VS_TIMER_DISPATCH) << 16 | VS_TIMER_DISPATCH);
+        }
+
         return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1fcc4c9efc00..2720bc2cd678 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -298,6 +298,10 @@
 #define INSTDONE        0x02090
 #define NOPID           0x02094
 #define HWSTAM          0x02098
+
+#define MI_MODE         0x0209c
+# define VS_TIMER_DISPATCH                              (1 << 6)
+
 #define SCPD0           0x0209c /* 915+ only */
 #define IER             0x020a0
 #define IIR             0x020a4