[Nouveau] [PATCH 3/3] drm/nv50: wait for pgraph to idle before unloading the context

[Maarten Maathuis]

This patch alone, so ignore the 3/3. I think this fixes the channel
unload hang issues in a less obscure way. Feedback appreciated as
usual.

On Mon, Jan 11, 2010 at 9:18 PM, Maarten Maathuis <madman2003 at gmail.com> wrote:
> - This should fix the problem with gpu hangs people have had when closing
> channels.
>
> Signed-off-by: Maarten Maathuis <madman2003 at gmail.com>
> ---
>  drivers/gpu/drm/nouveau/nv50_graph.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nv50_graph.c b/drivers/gpu/drm/nouveau/nv50_graph.c
> index 444a46b..d6897cf 100644
> --- a/drivers/gpu/drm/nouveau/nv50_graph.c
> +++ b/drivers/gpu/drm/nouveau/nv50_graph.c
> @@ -282,6 +282,7 @@ nv50_graph_unload_context(struct drm_device *dev)
>                return 0;
>        inst &= NV50_PGRAPH_CTXCTL_CUR_INSTANCE;
>
> +       nouveau_wait_for_idle(dev);
>        nv_wr32(dev, 0x400500, fifo & ~1);
>        nv_wr32(dev, 0x400784, inst);
>        nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) | 0x20);
> --
> 1.6.6
>
>