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i915_vblank_tasklet: Try harder to avoid tearing.
author=?utf-8?q?Michel_D=C3=A4nzer?= <michel@tungstengraphics.com>
Mon, 11 Dec 2006 07:32:27 +0000 (18:32 +1100)
committerDave Airlie <airlied@linux.ie>
Mon, 11 Dec 2006 07:32:27 +0000 (18:32 +1100)
Previously, if there were several buffer swaps scheduled for the same vertical
blank, all but the first blit emitted stood a chance of exhibiting tearing. In
order to avoid this, split the blits along slices of each output top to bottom.

Signed-off-by: Dave Airlie <airlied@linux.ie>

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