drm/nv86/fifo: suspend fix

This fix is a backport from the reworked nouveau driver.  It masks off the
engines we're not expecting to use before attempting a channel kickoff.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nv84_fifo.c b/drivers/gpu/drm/nouveau/nv84_fifo.c
index cc82d799fc3b..c564c5e4c30a 100644
--- a/drivers/gpu/drm/nouveau/nv84_fifo.c
+++ b/drivers/gpu/drm/nouveau/nv84_fifo.c
@@ -117,17 +117,22 @@ nv84_fifo_context_del(struct nouveau_channel *chan, int engine)
         struct drm_device *dev = chan->dev;
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         unsigned long flags;
+        u32 save;
 
         /* remove channel from playlist, will context switch if active */
         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
         nv_mask(dev, 0x002600 + (chan->id * 4), 0x80000000, 0x00000000);
         nv50_fifo_playlist_update(dev);
 
+        save = nv_mask(dev, 0x002520, 0x0000003f, 0x15);
+
         /* tell any engines on this channel to unload their contexts */
         nv_wr32(dev, 0x0032fc, chan->ramin->vinst >> 12);
         if (!nv_wait_ne(dev, 0x0032fc, 0xffffffff, 0xffffffff))
                 NV_INFO(dev, "PFIFO: channel %d unload timeout\n", chan->id);
 
+        nv_wr32(dev, 0x002520, save);
+
         nv_wr32(dev, 0x002600 + (chan->id * 4), 0x00000000);
         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 
@@ -184,10 +189,13 @@ nv84_fifo_fini(struct drm_device *dev, int engine, bool suspend)
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct nv84_fifo_priv *priv = nv_engine(dev, engine);
         int i;
+        u32 save;
 
         /* set playlist length to zero, fifo will unload context */
         nv_wr32(dev, 0x0032ec, 0);
 
+        save = nv_mask(dev, 0x002520, 0x0000003f, 0x15);
+
         /* tell all connected engines to unload their contexts */
         for (i = 0; i < priv->base.channels; i++) {
                 struct nouveau_channel *chan = dev_priv->channels.ptr[i];
@@ -199,6 +207,7 @@ nv84_fifo_fini(struct drm_device *dev, int engine, bool suspend)
                 }
         }
 
+        nv_wr32(dev, 0x002520, save);
         nv_wr32(dev, 0x002140, 0);
         return 0;
 }