[Bug 75502] [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Mar 4 06:59:27 PST 2014
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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