drm/i915: Rename power_domains.wakeref to init_wakeref

Rename power_domains.wakeref to power_domains.init_wakeref to make the
use of this reference clearer. The next patch adds tracking for another
power reference user of the power_domains functionality.

While at it add a missing zero wakeref assert when setting the wakeref.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201130212200.2811939-8-imre.deak@intel.com

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

@@ -5658,7 +5658,8 @@ void intel_power_domains_init_hw(struct drm_i915_private *i915, bool resume)
 	 * resources powered until display HW readout is complete. We drop
 	 * this reference in intel_power_domains_enable().
 	 */
-	power_domains->wakeref =
+	drm_WARN_ON(&i915->drm, power_domains->init_wakeref);
+	power_domains->init_wakeref =
 		intel_display_power_get(i915, POWER_DOMAIN_INIT);
 
 	/* Disable power support if the user asked so. */
@@ -5683,7 +5684,7 @@ void intel_power_domains_init_hw(struct drm_i915_private *i915, bool resume)
 void intel_power_domains_driver_remove(struct drm_i915_private *i915)
 {
 	intel_wakeref_t wakeref __maybe_unused =
-		fetch_and_zero(&i915->power_domains.wakeref);
+		fetch_and_zero(&i915->power_domains.init_wakeref);
 
 	/* Remove the refcount we took to keep power well support disabled. */
 	if (!i915->params.disable_power_well)
@@ -5712,7 +5713,7 @@ void intel_power_domains_driver_remove(struct drm_i915_private *i915)
 void intel_power_domains_enable(struct drm_i915_private *i915)
 {
 	intel_wakeref_t wakeref __maybe_unused =
-		fetch_and_zero(&i915->power_domains.wakeref);
+		fetch_and_zero(&i915->power_domains.init_wakeref);
 
 	intel_display_power_put(i915, POWER_DOMAIN_INIT, wakeref);
 	intel_power_domains_verify_state(i915);
@@ -5729,8 +5730,8 @@ void intel_power_domains_disable(struct drm_i915_private *i915)
 {
 	struct i915_power_domains *power_domains = &i915->power_domains;
 
-	drm_WARN_ON(&i915->drm, power_domains->wakeref);
-	power_domains->wakeref =
+	drm_WARN_ON(&i915->drm, power_domains->init_wakeref);
+	power_domains->init_wakeref =
 		intel_display_power_get(i915, POWER_DOMAIN_INIT);
 
 	intel_power_domains_verify_state(i915);
@@ -5752,7 +5753,7 @@ void intel_power_domains_suspend(struct drm_i915_private *i915,
 {
 	struct i915_power_domains *power_domains = &i915->power_domains;
 	intel_wakeref_t wakeref __maybe_unused =
-		fetch_and_zero(&power_domains->wakeref);
+		fetch_and_zero(&power_domains->init_wakeref);
 
 	intel_display_power_put(i915, POWER_DOMAIN_INIT, wakeref);
 
@@ -5811,8 +5812,8 @@ void intel_power_domains_resume(struct drm_i915_private *i915)
 		intel_power_domains_init_hw(i915, true);
 		power_domains->display_core_suspended = false;
 	} else {
-		drm_WARN_ON(&i915->drm, power_domains->wakeref);
-		power_domains->wakeref =
+		drm_WARN_ON(&i915->drm, power_domains->init_wakeref);
+		power_domains->init_wakeref =
 			intel_display_power_get(i915, POWER_DOMAIN_INIT);
 	}
 

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

@@ -212,7 +212,7 @@ struct i915_power_domains {
 	bool display_core_suspended;
 	int power_well_count;
 
-	intel_wakeref_t wakeref;
+	intel_wakeref_t init_wakeref;
 
 	struct mutex lock;
 	int domain_use_count[POWER_DOMAIN_NUM];

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1243,7 +1243,7 @@ static int i915_runtime_pm_status(struct seq_file *m, void *unused)
 		seq_puts(m, "Runtime power management not supported\n");
 
 	seq_printf(m, "Runtime power status: %s\n",
-		   enableddisabled(!dev_priv->power_domains.wakeref));
+		   enableddisabled(!dev_priv->power_domains.init_wakeref));
 
 	seq_printf(m, "GPU idle: %s\n", yesno(!dev_priv->gt.awake));
 	seq_printf(m, "IRQs disabled: %s\n",