Commit 2064db72 authored by Maxim Levitsky's avatar Maxim Levitsky Committed by Ben Skeggs
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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: default avatarMaxim Levitsky <>
Signed-off-by: default avatarBen Skeggs <>
parent fe0aac12
......@@ -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);
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;
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