1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 617634b6a6c2..c50388a86bca 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -984,6 +984,10 @@ void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
         /* Flush the TLB for this page */
         if (INTEL_INFO(dev)->gen >= 6) {
                 u32 reg = RING_INSTPM(ring->mmio_base);
+
+                /* ring should be idle before issuing a sync flush*/
+                WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0);
+
                 I915_WRITE(reg,
                            _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
                                               INSTPM_SYNC_FLUSH));