drm/i915: Store encoder power domain in struct intel_encoder

The encoder power domain is obviously tied to the encoder, so store it
in struct intel_encoder. This avoids some indirection.

v2: Rebase
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170222063431.10060-3-ander.conselvan.de.oliveira@intel.com
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 9ca4dc4..8b942ef 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -91,12 +91,11 @@ static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
-	enum intel_display_power_domain power_domain;
 	u32 tmp;
 	bool ret;
 
-	power_domain = intel_display_port_power_domain(encoder);
-	if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
+	if (!intel_display_power_get_if_enabled(dev_priv,
+						encoder->power_domain))
 		return false;
 
 	ret = false;
@@ -114,7 +113,7 @@ static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
 	ret = true;
 
 out:
-	intel_display_power_put(dev_priv, power_domain);
+	intel_display_power_put(dev_priv, encoder->power_domain);
 
 	return ret;
 }
@@ -1066,6 +1065,7 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	intel_connector_attach_encoder(intel_connector, intel_encoder);
 
 	intel_encoder->type = INTEL_OUTPUT_LVDS;
+	intel_encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
 	intel_encoder->port = PORT_NONE;
 	intel_encoder->cloneable = 0;
 	if (HAS_PCH_SPLIT(dev_priv))