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drm/i915: Don't emit semaphore wait if wrap happened

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If wrap just happened we need to prevent emitting waits for
pre wrap values. Detect this and emit no-ops instead.

v2: Use olr > seqno to detect wrap instead of *seqno == 0
as suggested by Chris Wilson.

v3: Use last used seqno to detect the wraparound. From
Chris Wilson

v4: Fixed unnecessary last_seqno assigment

References: https://bugs.freedesktop.org/show_bug.cgi?id=57967
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala
2012-12-10 15:41:48 +02:00
committed by Daniel Vetter
parent 3ac1823294
commit f72b3435c1
3 changed files with 23 additions and 7 deletions
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2
drivers/gpu/drm/i915/i915_gem.c
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@@ -1969,7 +1969,7 @@ i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
dev_priv->next_seqno = 1;
}
*seqno = dev_priv->next_seqno++;
*seqno = dev_priv->last_seqno = dev_priv->next_seqno++;
return 0;
}