drm/i915: kill dev_priv->pc8.gpu_idle

Since the addition of dev_priv->mm.busy, there's no more need for
dev_priv->pc8.gpu_idle, so kill it.

Notice that when you remove gpu_idle, hsw_package_c8_gpu_idle and
hsw_package_c8_gpu_busy become identical to hsw_enable_package_c8 and
hsw_disable_package_c8, so just use them.

Also, when we boot the machine, dev_priv->mm.busy initially considers
the machine as idle. This is opposed to dev_priv->pc8.gpu_idle, which
considered it busy. So dev_priv->pc8.disable_count has to be
initalized to 1 now.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2016,7 +2016,7 @@ static int i915_pc8_status(struct seq_file *m, void *unused)
 	mutex_lock(&dev_priv->pc8.lock);
 	seq_printf(m, "Requirements met: %s\n",
 		   yesno(dev_priv->pc8.requirements_met));
-	seq_printf(m, "GPU idle: %s\n", yesno(dev_priv->pc8.gpu_idle));
+	seq_printf(m, "GPU idle: %s\n", yesno(!dev_priv->mm.busy));
 	seq_printf(m, "Disable count: %d\n", dev_priv->pc8.disable_count);
 	seq_printf(m, "IRQs disabled: %s\n",
 		   yesno(dev_priv->pc8.irqs_disabled));

drivers/gpu/drm/i915/i915_drv.h

@@ -1321,11 +1321,10 @@ struct ilk_wm_values {
  * Ideally every piece of our code that needs PC8+ disabled would call
  * hsw_disable_package_c8, which would increment disable_count and prevent the
  * system from reaching PC8+. But we don't have a symmetric way to do this for
- * everything, so we have the requirements_met and gpu_idle variables. When we
+ * everything, so we have the requirements_met variable. When we switch
- * switch requirements_met or gpu_idle to true we decrease disable_count, and
+ * requirements_met to true we decrease disable_count, and increase it in the
- * increase it in the opposite case. The requirements_met variable is true when
+ * opposite case. The requirements_met variable is true when all the CRTCs,
- * all the CRTCs, encoders and the power well are disabled. The gpu_idle
+ * encoders and the power well are disabled.
- * variable is true when the GPU is idle.
  *
  * In addition to everything, we only actually enable PC8+ if disable_count
  * stays at zero for at least some seconds. This is implemented with the
@@ -1348,7 +1347,6 @@ struct ilk_wm_values {
  */
 struct i915_package_c8 {
 	bool requirements_met;
-	bool gpu_idle;
 	bool irqs_disabled;
 	/* Only true after the delayed work task actually enables it. */
 	bool enabled;

drivers/gpu/drm/i915/intel_display.c

@@ -6817,32 +6817,6 @@ static void hsw_update_package_c8(struct drm_device *dev)
 	mutex_unlock(&dev_priv->pc8.lock);
 }
 
-static void hsw_package_c8_gpu_idle(struct drm_i915_private *dev_priv)
-{
-	if (!HAS_PC8(dev_priv->dev))
-		return;
-
-	mutex_lock(&dev_priv->pc8.lock);
-	if (!dev_priv->pc8.gpu_idle) {
-		dev_priv->pc8.gpu_idle = true;
-		__hsw_enable_package_c8(dev_priv);
-	}
-	mutex_unlock(&dev_priv->pc8.lock);
-}
-
-static void hsw_package_c8_gpu_busy(struct drm_i915_private *dev_priv)
-{
-	if (!HAS_PC8(dev_priv->dev))
-		return;
-
-	mutex_lock(&dev_priv->pc8.lock);
-	if (dev_priv->pc8.gpu_idle) {
-		dev_priv->pc8.gpu_idle = false;
-		__hsw_disable_package_c8(dev_priv);
-	}
-	mutex_unlock(&dev_priv->pc8.lock);
-}
-
 #define for_each_power_domain(domain, mask)				\
 	for ((domain) = 0; (domain) < POWER_DOMAIN_NUM; (domain)++)	\
 		if ((1 << (domain)) & (mask))
@@ -8200,7 +8174,7 @@ void intel_mark_busy(struct drm_device *dev)
 	if (dev_priv->mm.busy)
 		return;
 
-	hsw_package_c8_gpu_busy(dev_priv);
+	hsw_disable_package_c8(dev_priv);
 	i915_update_gfx_val(dev_priv);
 	dev_priv->mm.busy = true;
 }
@@ -8229,7 +8203,7 @@ void intel_mark_idle(struct drm_device *dev)
 		gen6_rps_idle(dev->dev_private);
 
 out:
-	hsw_package_c8_gpu_idle(dev_priv);
+	hsw_enable_package_c8(dev_priv);
 }
 
 void intel_mark_fb_busy(struct drm_i915_gem_object *obj,

drivers/gpu/drm/i915/intel_pm.c

@@ -5809,10 +5809,9 @@ void intel_pm_setup(struct drm_device *dev)
 
 	mutex_init(&dev_priv->pc8.lock);
 	dev_priv->pc8.requirements_met = false;
-	dev_priv->pc8.gpu_idle = false;
 	dev_priv->pc8.irqs_disabled = false;
 	dev_priv->pc8.enabled = false;
-	dev_priv->pc8.disable_count = 2; /* requirements_met + gpu_idle */
+	dev_priv->pc8.disable_count = 1; /* requirements_met */
 	INIT_DELAYED_WORK(&dev_priv->pc8.enable_work, hsw_enable_pc8_work);
 	INIT_DELAYED_WORK(&dev_priv->rps.delayed_resume_work,
 			  intel_gen6_powersave_work);