[PATCH 06/15] drm/i915: Create uc runtime and system suspend/resume helpers

[Sagar Arun Kamble]

Prepared generic helpers intel_uc_suspend, intel_uc_resume,
intel_uc_runtime_suspend, intel_uc_runtime_resume. Added
error handling to all the calls for suspend/resume.

Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 23 ++++++++++++++++++++---
 drivers/gpu/drm/i915/i915_gem.c |  7 ++++++-
 drivers/gpu/drm/i915/intel_uc.c | 20 ++++++++++++++++++++
 drivers/gpu/drm/i915/intel_uc.h |  4 ++++
 4 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index ef4f84d..d54f35f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1693,7 +1693,15 @@ static int i915_drm_resume(struct drm_device *dev)
 	}
 	mutex_unlock(&dev->struct_mutex);
 
-	intel_guc_resume(dev_priv);
+	/*
+	 * NB: Full gem reinitialization is being done above, hence
+	 * intel_uc_resume will be of no use. Currently intel_uc_resume
+	 * is nop. If full reinitialization is removed, will  need to put
+	 * functionality to resume from sleep in intel_uc_resume.
+	 */
+	ret = intel_uc_resume(dev_priv);
+	if (ret)
+		DRM_ERROR("failed to resume uc\n");
 
 	intel_modeset_init_hw(dev);
 
@@ -2495,7 +2503,12 @@ static int intel_runtime_suspend(struct device *kdev)
 	 */
 	i915_gem_runtime_suspend(dev_priv);
 
-	intel_guc_suspend(dev_priv);
+	ret = intel_uc_runtime_suspend(dev_priv);
+	if (ret) {
+		DRM_ERROR("uc runtime suspend failed, disabling it(%d)\n", ret);
+		enable_rpm_wakeref_asserts(dev_priv);
+		return ret;
+	}
 
 	intel_runtime_pm_disable_interrupts(dev_priv);
 
@@ -2580,7 +2593,11 @@ static int intel_runtime_resume(struct device *kdev)
 	if (intel_uncore_unclaimed_mmio(dev_priv))
 		DRM_DEBUG_DRIVER("Unclaimed access during suspend, bios?\n");
 
-	intel_guc_resume(dev_priv);
+	ret = intel_uc_runtime_resume(dev_priv);
+	if (ret) {
+		DRM_ERROR("uc runtime resume failed (%d)\n", ret);
+		return ret;
+	}
 
 	if (IS_GEN9_LP(dev_priv)) {
 		bxt_disable_dc9(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f445587..c647bf5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4575,7 +4575,11 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	i915_gem_contexts_lost(dev_priv);
 	mutex_unlock(&dev->struct_mutex);
 
-	intel_guc_suspend(dev_priv);
+	ret = intel_uc_suspend(dev_priv);
+	if (ret) {
+		DRM_ERROR("uc suspend failed (%d)\n", ret);
+		goto out;
+	}
 
 	cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
 	cancel_delayed_work_sync(&dev_priv->gt.retire_work);
@@ -4619,6 +4623,7 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 
 err_unlock:
 	mutex_unlock(&dev->struct_mutex);
+out:
 	intel_runtime_pm_put(dev_priv);
 	return ret;
 }
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 89012be..a25493e 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -422,3 +422,23 @@ void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
 
 	i915_ggtt_disable_guc(dev_priv);
 }
+
+int intel_uc_runtime_suspend(struct drm_i915_private *dev_priv)
+{
+	return intel_guc_suspend(dev_priv);
+}
+
+int intel_uc_runtime_resume(struct drm_i915_private *dev_priv)
+{
+	return intel_guc_resume(dev_priv);
+}
+
+int intel_uc_suspend(struct drm_i915_private *dev_priv)
+{
+	return intel_guc_suspend(dev_priv);
+}
+
+int intel_uc_resume(struct drm_i915_private *dev_priv)
+{
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index aed2b86..c9f83f5 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -65,5 +65,9 @@ static inline const char *intel_uc_fw_type_repr(enum intel_uc_fw_type type)
 void intel_uc_init_mmio(struct drm_i915_private *dev_priv);
 int intel_uc_init_hw(struct drm_i915_private *dev_priv);
 void intel_uc_fini_hw(struct drm_i915_private *dev_priv);
+int intel_uc_runtime_suspend(struct drm_i915_private *dev_priv);
+int intel_uc_runtime_resume(struct drm_i915_private *dev_priv);
+int intel_uc_suspend(struct drm_i915_private *dev_priv);
+int intel_uc_resume(struct drm_i915_private *dev_priv);
 
 #endif
-- 
1.9.1