drm/i915: Inline intel_suspend_complete

Initially we thought that the platform specific suspend/resume sequences
can be shared between the runtime and system suspend/resume handlers.
This turned out to be not true, we have quite a few differences on most
of the platforms. This was realized already earlier by Paulo who
inlined the platform specific resume_prepare handlers. We have the
same problem with the corresponding suspend_complete handlers, there are
platform differences that make it unfeasible to share the code between
the runtime and system suspend paths. Also now we call functions that
need to be paired like hsw_enable_pc8()/hsw_disable_pc8() from different
levels of the call stack, which is confusing. Fix this by inlining the
suspend_complete handlers too.

This is also needed by the next patch that removes a redundant
uninit/init call during system suspend/resume on BXT.

No functional change.

CC: Paulo Zanoni <przanoni@gmail.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
[s/uninline/inline in the commit message]
Link: http://patchwork.freedesktop.org/patch/msgid/1461173277-16090-2-git-send-email-imre.deak@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -567,10 +567,9 @@ static void intel_suspend_encoders(struct drm_i915_private *dev_priv)
 	drm_modeset_unlock_all(dev);
 }
 
-static int intel_suspend_complete(struct drm_i915_private *dev_priv);
 static int vlv_resume_prepare(struct drm_i915_private *dev_priv,
 			      bool rpm_resume);
-static int bxt_resume_prepare(struct drm_i915_private *dev_priv);
+static int vlv_suspend_complete(struct drm_i915_private *dev_priv);
 
 static bool suspend_to_idle(struct drm_i915_private *dev_priv)
 {
@@ -668,7 +667,14 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation)
 	if (!fw_csr)
 		intel_power_domains_suspend(dev_priv);
 
-	ret = intel_suspend_complete(dev_priv);
+	ret = 0;
+	if (IS_BROXTON(dev_priv)) {
+		bxt_display_core_uninit(dev_priv);
+		bxt_enable_dc9(dev_priv);
+	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+		hsw_enable_pc8(dev_priv);
+	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
+		ret = vlv_suspend_complete(dev_priv);
 
 	if (ret) {
 		DRM_ERROR("Suspend complete failed: %d\n", ret);
@@ -862,9 +868,10 @@ static int i915_drm_resume_early(struct drm_device *dev)
 
 	intel_uncore_early_sanitize(dev, true);
 
-	if (IS_BROXTON(dev))
-		ret = bxt_resume_prepare(dev_priv);
-	else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+	if (IS_BROXTON(dev)) {
+		bxt_disable_dc9(dev_priv);
+		bxt_display_core_init(dev_priv, true);
+	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 		hsw_disable_pc8(dev_priv);
 
 	intel_uncore_sanitize(dev);
@@ -1102,29 +1109,6 @@ static int i915_pm_resume(struct device *dev)
 	return i915_drm_resume(drm_dev);
 }
 
-static int hsw_suspend_complete(struct drm_i915_private *dev_priv)
-{
-	hsw_enable_pc8(dev_priv);
-
-	return 0;
-}
-
-static int bxt_suspend_complete(struct drm_i915_private *dev_priv)
-{
-	bxt_display_core_uninit(dev_priv);
-	bxt_enable_dc9(dev_priv);
-
-	return 0;
-}
-
-static int bxt_resume_prepare(struct drm_i915_private *dev_priv)
-{
-	bxt_disable_dc9(dev_priv);
-	bxt_display_core_init(dev_priv, true);
-
-	return 0;
-}
-
 /*
  * Save all Gunit registers that may be lost after a D3 and a subsequent
  * S0i[R123] transition. The list of registers needing a save/restore is
@@ -1530,7 +1514,16 @@ static int intel_runtime_suspend(struct device *device)
 	intel_suspend_gt_powersave(dev);
 	intel_runtime_pm_disable_interrupts(dev_priv);
 
-	ret = intel_suspend_complete(dev_priv);
+	ret = 0;
+	if (IS_BROXTON(dev_priv)) {
+		bxt_display_core_uninit(dev_priv);
+		bxt_enable_dc9(dev_priv);
+	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
+		hsw_enable_pc8(dev_priv);
+	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+		ret = vlv_suspend_complete(dev_priv);
+	}
+
 	if (ret) {
 		DRM_ERROR("Runtime suspend failed, disabling it (%d)\n", ret);
 		intel_runtime_pm_enable_interrupts(dev_priv);
@@ -1604,12 +1597,14 @@ static int intel_runtime_resume(struct device *device)
 	if (IS_GEN6(dev_priv))
 		intel_init_pch_refclk(dev);
 
-	if (IS_BROXTON(dev))
-		ret = bxt_resume_prepare(dev_priv);
-	else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+	if (IS_BROXTON(dev)) {
+		bxt_disable_dc9(dev_priv);
+		bxt_display_core_init(dev_priv, true);
+	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
 		hsw_disable_pc8(dev_priv);
-	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
+	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		ret = vlv_resume_prepare(dev_priv, true);
+	}
 
 	/*
 	 * No point of rolling back things in case of an error, as the best
@@ -1640,26 +1635,6 @@ static int intel_runtime_resume(struct device *device)
 	return ret;
 }
 
-/*
- * This function implements common functionality of runtime and system
- * suspend sequence.
- */
-static int intel_suspend_complete(struct drm_i915_private *dev_priv)
-{
-	int ret;
-
-	if (IS_BROXTON(dev_priv))
-		ret = bxt_suspend_complete(dev_priv);
-	else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
-		ret = hsw_suspend_complete(dev_priv);
-	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-		ret = vlv_suspend_complete(dev_priv);
-	else
-		ret = 0;
-
-	return ret;
-}
-
 static const struct dev_pm_ops i915_pm_ops = {
 	/*
 	 * S0ix (via system suspend) and S3 event handlers [PMSG_SUSPEND,