drm/i915/gt: Introduce intel_gt_runtime_suspend/resume

To be called from the top level runtime functions, to hide the
gt-specific bits (mainly related to intel_uc).

v2: rebased
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190801005709.34092-3-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/intel_gt_pm.c

@@ -164,3 +164,15 @@ int intel_gt_resume(struct intel_gt *gt)
 
 	return err;
 }
+
+void intel_gt_runtime_suspend(struct intel_gt *gt)
+{
+	intel_uc_runtime_suspend(&gt->uc);
+}
+
+int intel_gt_runtime_resume(struct intel_gt *gt)
+{
+	intel_gt_init_swizzling(gt);
+
+	return intel_uc_runtime_resume(&gt->uc);
+}

drivers/gpu/drm/i915/gt/intel_gt_pm.h

@@ -23,5 +23,7 @@ void intel_gt_pm_init_early(struct intel_gt *gt);
 
 void intel_gt_sanitize(struct intel_gt *gt, bool force);
 int intel_gt_resume(struct intel_gt *gt);
+void intel_gt_runtime_suspend(struct intel_gt *gt);
+int intel_gt_runtime_resume(struct intel_gt *gt);
 
 #endif /* INTEL_GT_PM_H */

drivers/gpu/drm/i915/i915_drv.c

@@ -2925,7 +2925,7 @@ static int intel_runtime_suspend(struct device *kdev)
 	 */
 	i915_gem_runtime_suspend(dev_priv);
 
-	intel_uc_runtime_suspend(&dev_priv->gt.uc);
+	intel_gt_runtime_suspend(&dev_priv->gt);
 
 	intel_runtime_pm_disable_interrupts(dev_priv);
 
@@ -2950,9 +2950,8 @@ static int intel_runtime_suspend(struct device *kdev)
 
 		intel_runtime_pm_enable_interrupts(dev_priv);
 
-		intel_uc_runtime_resume(&dev_priv->gt.uc);
+		intel_gt_runtime_resume(&dev_priv->gt);
 
-		intel_gt_init_swizzling(&dev_priv->gt);
 		i915_gem_restore_fences(dev_priv);
 
 		enable_rpm_wakeref_asserts(rpm);
@@ -3047,13 +3046,11 @@ static int intel_runtime_resume(struct device *kdev)
 
 	intel_runtime_pm_enable_interrupts(dev_priv);
 
-	intel_uc_runtime_resume(&dev_priv->gt.uc);
-
 	/*
 	 * No point of rolling back things in case of an error, as the best
 	 * we can do is to hope that things will still work (and disable RPM).
 	 */
-	intel_gt_init_swizzling(&dev_priv->gt);
+	intel_gt_runtime_resume(&dev_priv->gt);
 	i915_gem_restore_fences(dev_priv);
 
 	/*