[PATCH v2] drm/i915: Fix forcewake active domain tracking

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

In commit 003342a50021 ("drm/i915: Keep track of active
forcewake domains in a bitmask") I forgot to adjust the
newly introduce fw_domains_active state across reset.

This caused the assert_forcewakes_inactive to trigger
during suspend and resume if there were user held
forcewakes.

v2: Bitmask checks are required since vfuncs are not
    always present.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 003342a50021 ("drm/i915: Keep track of active forcewake domains in a bitmask")
Testcase: igt/drv_suspend/forcewake
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: "Paneri, Praveen" <praveen.paneri@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Cc: v4.10+ <stable@vger.kernel.org>
---
 drivers/gpu/drm/i915/intel_uncore.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 2a3f35c30501..7efae77faca0 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -304,12 +304,14 @@ static void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv,
 	fw = dev_priv->uncore.fw_domains_active;
 	if (fw)
 		dev_priv->uncore.funcs.force_wake_put(dev_priv, fw);
+	dev_priv->uncore.fw_domains_active = 0;
 
 	fw_domains_reset(dev_priv, FORCEWAKE_ALL);
 
 	if (restore) { /* If reset with a user forcewake, try to restore */
 		if (fw)
 			dev_priv->uncore.funcs.force_wake_get(dev_priv, fw);
+		dev_priv->uncore.fw_domains_active = fw;
 
 		if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv))
 			dev_priv->uncore.fifo_count =
-- 
2.9.3

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