[Bug 76554] [gm45 regression] [drm:init_ring_common]: *ERROR* render ring initialization failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76554

--- Comment #41 from Chris Wilson <chris at chris-wilson.co.uk> ---
One last paste... (Apologies for any white space issues, this is just trying to
be quick and dirty.)


diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5a74986348c6..75365c1588fb 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -526,9 +526,28 @@ static int init_ring_common(struct intel_ring_buffer
*ring)
         * also enforces ordering), otherwise the hw might lose the new ring
         * register values. */
        I915_WRITE_START(ring, i915_gem_obj_ggtt_offset(obj));
+       if (wait_for(I915_READ_START(ring) == i915_gem_obj_ggtt_offset(obj),
+                    1000)) {
+               DRM_ERROR("%s initialization failed "
+                         "start %08x [expected %08lx]\n",
+                         ring->name,
+                         I915_READ_START(ring),
+                         (unsigned long)i915_gem_obj_ggtt_offset(obj));
+               ret = -EIO;
+               goto out;
+       }
+
        I915_WRITE_CTL(ring,
                        ((ring->size - PAGE_SIZE) & RING_NR_PAGES)
                        | RING_VALID);
+       if (wait_for(I915_READ_CTL(ring) & RING_VALID, 1000)) {
+               DRM_ERROR("%s initialization failed ctl %08x (valid? %d)\n",
+                         ring->name,
+                         I915_READ_CTL(ring),
+                         !!(I915_READ_CTL(ring) & RING_VALID));
+               ret = -EIO;
+               goto out;
+       }

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