1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6ef9d6fabf80..845f0f6c1eeb 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -4680,6 +4680,14 @@ void intel_irq_init(struct drm_device *dev)
                 dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
         }
 
+        /*
+         * Opt out of the vblank disable timer on everything except gen2.
+         * Gen2 doesn't have a hardware frame counter and so depends on
+         * vblank interrupts to produce sane vblank seuquence numbers.
+         */
+        if (!IS_GEN2(dev))
+                dev->vblank_disable_immediate = true;
+
         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                 dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
                 dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;