[Bug 75502] [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #18 from Chris Wilson <chris at chris-wilson.co.uk> ---
Does

diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 25c486d5fb6a..97827bf9396a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2359,6 +2359,11 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
        struct drm_framebuffer *old_fb;
        int ret;

+       if (intel_crtc_has_pending_flip(crtc)) {
+               DRM_ERROR("pipe is still busy with an old pageflip\n");
+               return -EBUSY;
+       }
+
        /* no fb bound */
        if (!fb) {
                DRM_ERROR("No FB bound\n");

register anything after the freeze?

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