[Bug 76554] [gm45 regression] [drm:init_ring_common]: *ERROR* render ring initialization failed
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Apr 22 04:36:11 PDT 2014
https://bugs.freedesktop.org/show_bug.cgi?id=76554
--- Comment #44 from Chris Wilson <chris at chris-wilson.co.uk> ---
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5a74986348c6..b46b3e928a7f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -530,6 +530,17 @@ static int init_ring_common(struct intel_ring_buffer
*ring)
((ring->size - PAGE_SIZE) & RING_NR_PAGES)
| RING_VALID);
+ if (I915_READ_START(ring) != i915_gem_obj_ggtt_offset(obj)) {
+ printk(KERN_ERR
+ "%s initialization failed"
+ " [%08x != %08x], fudging\n",
+ ring->name,
+ I915_READ_START(ring),
+ i915_gem_obj_ggtt_offset(obj));
+ I915_WRITE_START(ring, i915_gem_obj_ggtt_offset(obj));
+ POSTING_READ(ring);
+ }
+
iowrite32(MI_NOOP, ring->virtual_start + 0);
iowrite32(MI_NOOP, ring->virtual_start + 4);
ring->write_tail(ring, 8);
--
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