drm/i915: Do not serialize forcewake acquire across domains

On platforms with multiple forcewake domains it seems more efficient
to request all desired ones and then to wait for acks to avoid
needlessly serializing on each domain.

v2: Rebase.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1460045074-1006-1-git-send-email-tvrtko.ursulin@linux.intel.com

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 963a3875d43683976c3ad50ac7b1c7f759265467..dcf38bb5a09761976478b4531547653307a06448 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -115,8 +115,10 @@ fw_domains_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_doma
        for_each_fw_domain_masked(d, fw_domains, dev_priv) {
                fw_domain_wait_ack_clear(d);
                fw_domain_get(d);
-               fw_domain_wait_ack(d);
        }
+
+       for_each_fw_domain_masked(d, fw_domains, dev_priv)
+               fw_domain_wait_ack(d);
 }
 
 static void