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Subject[ 16/48] drm/i915: Do the fallback non-IRQ wait in ring throttle, too.
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
From: Eric Anholt <eric@anholt.net>

commit 7ea29b13e5e3e1e61e612349eb0366efdb6457f3 upstream.

As a workaround for IRQ synchronization issues in the gen7 BLT ring,
we want to turn the two wait functions into polling loops.

Signed-off-by: Eric Anholt <eric@anholt.net>
Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8359dc7..66e0a55 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3309,6 +3309,10 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)

if (ret == 0 && atomic_read(&dev_priv->mm.wedged))
ret = -EIO;
+ } else if (wait_for(i915_seqno_passed(ring->get_seqno(ring),
+ seqno) ||
+ atomic_read(&dev_priv->mm.wedged), 3000)) {
+ ret = -EBUSY;
}
}




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