drm/i915: Add function to call a power well's sync_hw() hook

Add a function to call a power well's sync_hw() hook, instead of
open-coding the same, as a step towards making the low-level
power well internals (i915_power_well_ops/desc structs) hidden.

The cached-enable state should be always up-to-date, so update it
whenever sync_hw() is called.

No functional change.
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220222165137.1004194-7-imre.deak@intel.com

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

@@ -5016,11 +5016,8 @@ static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
 	struct i915_power_well *power_well;
 
 	mutex_lock(&power_domains->lock);
-	for_each_power_well(dev_priv, power_well) {
-		power_well->desc->ops->sync_hw(dev_priv, power_well);
-		power_well->hw_enabled =
-			power_well->desc->ops->is_enabled(dev_priv, power_well);
-	}
+	for_each_power_well(dev_priv, power_well)
+		intel_power_well_sync_hw(dev_priv, power_well);
 	mutex_unlock(&power_domains->lock);
 }
 

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

@@ -22,6 +22,14 @@ void intel_power_well_disable(struct drm_i915_private *i915,
 	power_well->desc->ops->disable(i915, power_well);
 }
 
+void intel_power_well_sync_hw(struct drm_i915_private *i915,
+			      struct i915_power_well *power_well)
+{
+	power_well->desc->ops->sync_hw(i915, power_well);
+	power_well->hw_enabled =
+		power_well->desc->ops->is_enabled(i915, power_well);
+}
+
 void intel_power_well_get(struct drm_i915_private *i915,
 			  struct i915_power_well *power_well)
 {

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

@@ -107,6 +107,8 @@ void intel_power_well_enable(struct drm_i915_private *i915,
 			     struct i915_power_well *power_well);
 void intel_power_well_disable(struct drm_i915_private *i915,
 			      struct i915_power_well *power_well);
+void intel_power_well_sync_hw(struct drm_i915_private *i915,
+			      struct i915_power_well *power_well);
 void intel_power_well_get(struct drm_i915_private *i915,
 			  struct i915_power_well *power_well);
 void intel_power_well_put(struct drm_i915_private *i915,