drm: Don't clear vblank timestamps when vblank interrupt is disabled
Clearing the timestamps causes us to send zeroed timestamps to userspace if they get sent out in response to the drm_vblank_off(). It's better to send the very latest timestamp and count instead. Testcase: igt/kms_flip/modeset-vs-vblank-race Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -55,14 +55,6 @@
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*/
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#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
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/*
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* Clear vblank timestamp buffer for a crtc.
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*/
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static void clear_vblank_timestamps(struct drm_device *dev, int crtc)
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{
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memset(dev->vblank[crtc].time, 0, sizeof(dev->vblank[crtc].time));
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}
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/*
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* Disable vblank irq's on crtc, make sure that last vblank count
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* of hardware and corresponding consistent software vblank counter
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@ -131,9 +123,6 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
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smp_mb__after_atomic();
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}
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/* Invalidate all timestamps while vblank irq's are off. */
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clear_vblank_timestamps(dev, crtc);
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spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
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}
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