drm/i915/hdcp: No direct access to power_well desc

HDCP code doesn't require to access power_well internal stuff,
instead it should use the intel_display_power_well_is_enabled()
to get the status of desired power_well.
No functional change.

v2:
- used with_intel_runtime_pm instead of get/put. [Jani]
v3:
- rebased.

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200805114521.867-3-anshuman.gupta@intel.com

drivers/gpu/drm/i915/display/intel_hdcp.c

@@ -148,9 +148,8 @@ static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *dig_port,
 
 static bool hdcp_key_loadable(struct drm_i915_private *dev_priv)
 {
-	struct i915_power_domains *power_domains = &dev_priv->power_domains;
-	struct i915_power_well *power_well;
 	enum i915_power_well_id id;
+	intel_wakeref_t wakeref;
 	bool enabled = false;
 
 	/*
@@ -162,17 +161,9 @@ static bool hdcp_key_loadable(struct drm_i915_private *dev_priv)
 	else
 		id = SKL_DISP_PW_1;
 
-	mutex_lock(&power_domains->lock);
-
 	/* PG1 (power well #1) needs to be enabled */
-	for_each_power_well(dev_priv, power_well) {
-		if (power_well->desc->id == id) {
-			enabled = power_well->desc->ops->is_enabled(dev_priv,
-								    power_well);
-			break;
-		}
-	}
-	mutex_unlock(&power_domains->lock);
+	with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref)
+		enabled = intel_display_power_well_is_enabled(dev_priv, id);
 
 	/*
 	 * Another req for hdcp key loadability is enabled state of pll for