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drm/nouveau: workaround semaphore hw bug causing unnecessary interrupts
authorBen Skeggs <bskeggs@redhat.com>
Mon, 25 Jul 2011 10:26:19 +0000 (20:26 +1000)
committerBen Skeggs <bskeggs@redhat.com>
Tue, 20 Sep 2011 06:08:59 +0000 (16:08 +1000)
The HW will only accept the DMA_FROM_MEMORY class for DMA_SEMAPHORE without
asking the driver to intervene.

It appears that semaphores will work correctly even without DMA_IN_MEMORY,
so lets avoid the large amount of interrupts generated by x-chan sync.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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