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path: root/drivers/gpu/drm/nouveau/nouveau_dma.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dma.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_dma.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dma.c b/drivers/gpu/drm/nouveau/nouveau_dma.c
index c8482a108a7..65c441a1999 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dma.c
@@ -190,6 +190,11 @@ nv50_dma_push(struct nouveau_channel *chan, struct nouveau_bo *bo,
nouveau_bo_wr32(pb, ip++, upper_32_bits(offset) | length << 8);
chan->dma.ib_put = (chan->dma.ib_put + 1) & chan->dma.ib_max;
+
+ DRM_MEMORYBARRIER();
+ /* Flush writes. */
+ nouveau_bo_rd32(pb, 0);
+
nvchan_wr32(chan, 0x8c, chan->dma.ib_put);
chan->dma.ib_free--;
}