On Tue, Feb 19, 2013 at 10:20:55AM +0000, Maarten Lankhorst wrote:
> Everywhere else the constant is multiplied by 16/4, so it looks like
> nvc0_fence_suspend/resume is buggy here.
> 
> Signed-off-by: Maarten Lankhorst <m.b.lankho...@gmail.com>
> Cc: sta...@vger.kernel.org [3.7+]

Yay. It will probably fix https://bugs.freedesktop.org/show_bug.cgi?id=59168.
(note: it doesn't apply on top of nouveau/master)

Reviewed-by: Marcin Slusarz <marcin.slus...@gmail.com>

> ---
> 
> diff --git a/drivers/gpu/drm/nouveau/nvc0_fence.c
> b/drivers/gpu/drm/nouveau/nvc0_fence.c
> index 85a0e78..4f46d8b 100644
> --- a/drivers/gpu/drm/nouveau/nvc0_fence.c
> +++ b/drivers/gpu/drm/nouveau/nvc0_fence.c
> @@ -161,11 +161,12 @@ nvc0_fence_suspend(struct nouveau_drm *drm)
>       struct nouveau_fifo *pfifo = nouveau_fifo(drm->device);
>       struct nvc0_fence_priv *priv = drm->fence;
>       int i;
> +     u32 chan = pfifo->max + 1;
> 
> -     priv->suspend = vmalloc((pfifo->max + 1) * sizeof(u32));
> +     priv->suspend = vmalloc(chan * sizeof(u32));
>       if (priv->suspend) {
> -             for (i = 0; i <= pfifo->max; i++)
> -                     priv->suspend[i] = nouveau_bo_rd32(priv->bo, i);
> +             for (i = 0; i < chan; i++)
> +                     priv->suspend[i] = nouveau_bo_rd32(priv->bo, i * 16/4);
>       }
> 
>       return priv->suspend != NULL;
> @@ -177,10 +178,11 @@ nvc0_fence_resume(struct nouveau_drm *drm)
>       struct nouveau_fifo *pfifo = nouveau_fifo(drm->device);
>       struct nvc0_fence_priv *priv = drm->fence;
>       int i;
> +     u32 chan = pfifo->max + 1;
> 
>       if (priv->suspend) {
> -             for (i = 0; i <= pfifo->max; i++)
> -                     nouveau_bo_wr32(priv->bo, i, priv->suspend[i]);
> +             for (i = 0; i < chan; i++)
> +                     nouveau_bo_wr32(priv->bo, i * 16/4, priv->suspend[i]);
>               vfree(priv->suspend);
>               priv->suspend = NULL;
>       }
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