[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 #19 from Simon Farnsworth <simon at farnz.org.uk> ---
I'm still on 3.13.4 here, so backported it as:

diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index d8013f5..66ccf9b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2300,6 +2300,11 @@ 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");

Will let you know the results.

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