From ce48fa93a6f5cadd4141a921dfb4129c8850374e Mon Sep 17 00:00:00 2001 From: Maarten Maathuis Date: Thu, 25 Feb 2010 20:00:38 +0100 Subject: [PATCH] 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 Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_dma.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/nouveau/nouveau_dma.c b/drivers/gpu/drm/nouveau/nouveau_dma.c index c8482a108a78..65c441a1999f 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--; } -- 2.20.1