From: Eric Anholt <eric@anholt.net>
Date: Thu, 22 Dec 2011 22:54:59 +0000 (-0800)
Subject: drm/i915: Do the fallback non-IRQ wait in ring throttle, too.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7ea29b13e5e3e1e61e612349eb0366efdb6457f3;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

drm/i915: Do the fallback non-IRQ wait in ring throttle, too.

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>
---

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8359dc777041..66e0a555dbcc 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;
 		}
 	}