[Bug 80948] [sna suse] many black lines with latest ddx

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80948

--- Comment #37 from Chris Wilson <chris at chris-wilson.co.uk> ---
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_d
index d0f3cbc..b4c5507 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10022,6 +10022,11 @@ static int intel_queue_mmio_flip(struct drm_device
*dev
                                 uint32_t flags)
 {
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+       int ret;
+
+       ret = i915_gem_check_olr(obj->last_write_req);
+       if (ret)
+               return ret;

        i915_gem_request_assign(&intel_crtc->mmio_flip.req,
                                obj->last_write_req);

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