drm/i915/pps: add locked intel_pps_wait_power_cycle

Prefer keeping the unlocked variants hidden if possible. No functional
changes.
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4b712770deab9de8c3aeea8df35269433977038a.1610127741.git.jani.nikula@intel.com

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

@@ -6324,13 +6324,8 @@ void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder)
 void intel_dp_encoder_shutdown(struct intel_encoder *intel_encoder)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_encoder);
-	intel_wakeref_t wakeref;
-
-	if (!intel_dp_is_edp(intel_dp))
-		return;
 
-	with_intel_pps_lock(intel_dp, wakeref)
-		wait_panel_power_cycle(intel_dp);
+	intel_pps_wait_power_cycle(intel_dp);
 }
 
 static enum pipe vlv_active_pipe(struct intel_dp *intel_dp)

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

@@ -500,7 +500,7 @@ static void wait_panel_off(struct intel_dp *intel_dp)
 	wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
 }
 
-void wait_panel_power_cycle(struct intel_dp *intel_dp)
+static void wait_panel_power_cycle(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	ktime_t panel_power_on_time;
@@ -522,6 +522,17 @@ void wait_panel_power_cycle(struct intel_dp *intel_dp)
 	wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
 }
 
+void intel_pps_wait_power_cycle(struct intel_dp *intel_dp)
+{
+	intel_wakeref_t wakeref;
+
+	if (!intel_dp_is_edp(intel_dp))
+		return;
+
+	with_intel_pps_lock(intel_dp, wakeref)
+		wait_panel_power_cycle(intel_dp);
+}
+
 static void wait_backlight_on(struct intel_dp *intel_dp)
 {
 	wait_remaining_ms_from_jiffies(intel_dp->last_power_on,

drivers/gpu/drm/i915/display/intel_pps.h

@@ -37,8 +37,7 @@ void intel_pps_on(struct intel_dp *intel_dp);
 void intel_pps_off(struct intel_dp *intel_dp);
 void intel_pps_vdd_off_sync(struct intel_dp *intel_dp);
 bool intel_pps_have_power(struct intel_dp *intel_dp);
-
-void wait_panel_power_cycle(struct intel_dp *intel_dp);
+void intel_pps_wait_power_cycle(struct intel_dp *intel_dp);
 
 void intel_pps_init(struct intel_dp *intel_dp);
 void intel_pps_encoder_reset(struct intel_dp *intel_dp);