From 91a8f1ea4bd98a7de888f7d56e28b72cc0c63ca1 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Mon, 25 Jul 2011 20:26:19 +1000
Subject: [PATCH] drm/nouveau: workaround semaphore hw bug causing unnecessary
 interrupts

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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