---
drivers/gpu/drm/i915/intel_ringbuffer.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 3316ec190d9c..1fefba56e073 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -477,6 +477,13 @@ static int init_ring_common(struct intel_ring_buffer *ring)
gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
+ printk(KERN_ERR "Ring %s before initialisation: %08x %08x %08x %08x\n",
+ ring->name,
+ I915_READ_CTL(ring),
+ I915_READ_HEAD(ring),
+ I915_READ_TAIL(ring),
+ I915_READ_START(ring));
+
if (!stop_ring(ring)) {
/* G45 ring initialization often fails to reset head to zero */
DRM_DEBUG_KMS("%s head not reset to zero "
@@ -540,6 +547,12 @@ static int init_ring_common(struct intel_ring_buffer *ring)
memset(&ring->hangcheck, 0, sizeof(ring->hangcheck));
out:
+ printk(KERN_ERR "Ring %s after initialisation: %08x %08x %08x %08x\n",
+ ring->name,
+ I915_READ_CTL(ring),
+ I915_READ_HEAD(ring),
+ I915_READ_TAIL(ring),
+ I915_READ_START(ring));
gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
return ret;
--
1.9.1
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