drm/i915: Fix disabled semaphores

The ring will emit too many if semaphores are disabled since we do not
add the correct number to num_dwords anymore.

This was introduced:
commit 52ed23253b68e1cf154b03d91bed619504cf955b
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Mon Dec 16 20:50:38 2013 -0800

    drm/i915: Don't emit mbox updates without semaphores

FWIW, the bug was fixed later in the series.

/me hangs head in shame.

Daniel: Also note that we should have merged the read-only semaphore
modparam before this patch.

Reported-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8fcb32a..b7f1742 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -673,10 +673,12 @@ gen6_add_request(struct intel_ring_buffer *ring)
        if (ret)
                return ret;
 
-       for_each_ring(useless, dev_priv, i) {
-               u32 mbox_reg = ring->signal_mbox[i];
-               if (mbox_reg != GEN6_NOSYNC)
-                       update_mboxes(ring, mbox_reg);
+       if (i915_semaphore_is_enabled(dev)) {
+               for_each_ring(useless, dev_priv, i) {
+                       u32 mbox_reg = ring->signal_mbox[i];
+                       if (mbox_reg != GEN6_NOSYNC)
+                               update_mboxes(ring, mbox_reg);
+               }
        }
 
        intel_ring_emit(ring, MI_STORE_DWORD_INDEX);