[Nouveau] [PATCH 2/2] drm/nv50: add a memory barrier to pushbuf submission

[Maarten Maathuis]

- pre-nv50 has one too (in WRITE_PUT).

Signed-off-by: Maarten Maathuis <madman2003 at gmail.com>
---
 drivers/gpu/drm/nouveau/nouveau_dma.c |    5 +++++
 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 c8482a1..65c441a 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--;
 }
-- 
1.7.0