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drm/i915: Filter out no-op frontbuffer tracking flushes

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Paulo noticed that the fbc frontbuffer tracking flush callback
occasionally gets a call without any bit set. This can happen when we
have to filter flush calls due to e.g. gpu rendering. Filter these
out.

Reported-by: Paulo Zanoni <przanoni@gmail.com>
Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2015-06-18 10:30:21 +02:00
parent fdbff9282c
commit 27e78a2a1f
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_frontbuffer.c
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@ -175,6 +175,9 @@ void intel_frontbuffer_flush(struct drm_device *dev,
frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits;
mutex_unlock(&dev_priv->fb_tracking.lock);
if (!frontbuffer_bits)
return;
intel_mark_fb_busy(dev, frontbuffer_bits);
intel_edp_drrs_flush(dev, frontbuffer_bits);