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drm/nouveau/fifo/gk104: kick channel upon removal

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A channel may still be processed by the PBDMA even after removal, unless
it is properly kicked. Some chips are more sensible to this than others,
with GM20B triggering the issue very easily (the PBDMA will try to fetch
methods from the previously-removed channel after a new one is added).

Make sure this cannot happen by kicking the channel right after it is
disabled, and before the new runlist is submitted.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2016-03-01 16:59:05 +09:00 committed by Ben Skeggs
parent e02d586da6
commit 2bf1833e51
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c
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@ -154,6 +154,7 @@ gk104_fifo_gpfifo_fini(struct nvkm_fifo_chan *base)
if (!list_empty(&chan->head)) {
gk104_fifo_runlist_remove(fifo, chan);
nvkm_mask(device, 0x800004 + coff, 0x00000800, 0x00000800);
gk104_fifo_gpfifo_kick(chan);
gk104_fifo_runlist_commit(fifo, chan->engine);
}