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drm/nv50: add a memory barrier to pushbuf submission 

- This is useful for vram pushbuffers that are write combined.
- pre-nv50 has one too (in WRITE_PUT).

Signed-off-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Maarten Maathuis 2010-02-25 20:00:38 +01:00 committed by Ben Skeggs
parent 81441570c9
commit ce48fa93a6
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/nouveau/nouveau_dma.c
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@ -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--;
}