[PATCH 2/2] drm/i915: take a power domain reference while checking the HDMI live status

[Imre Deak <imre.deak@intel.com>]

There are platforms that don't need the full GMBUS power domain
(PCH, BXT) while others do (VLV/CHV). For optimizing this we
would need to add a new power domain, but it's not clear how much we
would benefit given the short time we hold the reference. So for now
let's keep things simple.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 17ced03..bdd462e 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1393,6 +1393,8 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 		      connector->base.id, connector->name);
 
+	intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
+
 	while (!live_status && --retry) {
 		live_status = intel_digital_port_connected(dev_priv,
 				hdmi_to_dig_port(intel_hdmi));
@@ -1412,6 +1414,8 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 	} else
 		status = connector_status_disconnected;
 
+	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
+
 	return status;
 }
 
-- 
2.5.0

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