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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75502#c19">Comment # 19</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75502">bug 75502</a>
from <span class="vcard"><a class="email" href="mailto:simon@farnz.org.uk" title="Simon Farnsworth <simon@farnz.org.uk>"> <span class="fn">Simon Farnsworth</span></a>
</span></b>
<pre>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.</pre>
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