drm/i915: Reset the HEAD pointer for the ring after writing START

Ville found an old w/a documented for g4x that suggested that we need to
reset the HEAD after writing START. This is a useful fixup for some of
the g4x ring initialisation woes, but as usual, not all.

v2: Do the rewrite unconditionally anyway

References: https://bugs.freedesktop.org/show_bug.cgi?id=76554
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f8aadc3c2124..85fc2b1a124a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -563,6 +563,14 @@ static int init_ring_common(struct intel_engine_cs *ring)
          * also enforces ordering), otherwise the hw might lose the new ring
          * register values. */
         I915_WRITE_START(ring, i915_gem_obj_ggtt_offset(obj));
+
+        /* WaClearRingBufHeadRegAtInit:ctg,elk */
+        if (I915_READ_HEAD(ring))
+                DRM_DEBUG("%s initialization failed [head=%08x], fudging\n",
+                          ring->name, I915_READ_HEAD(ring));
+        I915_WRITE_HEAD(ring, 0);
+        (void)I915_READ_HEAD(ring);
+
         I915_WRITE_CTL(ring,
                         ((ringbuf->size - PAGE_SIZE) & RING_NR_PAGES)
                         | RING_VALID);