1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b6f593a6d970..463f75330282 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7325,6 +7325,19 @@ void ironlake_enable_rc6(struct drm_device *dev)
         OUT_RING(MI_FLUSH);
         ADVANCE_LP_RING();
 
+        /*
+         * Wait for the command parser to advance past MI_SET_CONTEXT. The HW
+         * does an implicit flush, combined with MI_FLUSH above, it should be
+         * safe to assume that renderctx is valid
+         */
+        ret = intel_wait_ring_idle(LP_RING(dev_priv));
+        if (ret) {
+                DRM_ERROR("failed to enable ironlake power power savings\n");
+                ironlake_teardown_rc6(dev);
+                mutex_unlock(&dev->struct_mutex);
+                return;
+        }
+
         I915_WRITE(PWRCTXA, dev_priv->pwrctx->gtt_offset | PWRCTX_EN);
         I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
         mutex_unlock(&dev->struct_mutex);