[PATCH v5 15/27] drm/i915/slpc: Send shutdown event

[Sagar Arun Kamble]

From: Tom O'Rourke <Tom.O'Rourke at intel.com>

Send SLPC shutdown event during disable, suspend, and reset
operations.  Sending shutdown event while already shutdown
is OK.

v2: return void instead of ignored error code (Paulo)

v5: Removed WARN_ON for checking msb of gtt address of
    shared gem obj. (ChrisW)

Signed-off-by: Tom O'Rourke <Tom.O'Rourke at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/intel_slpc.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index 9c31e00..437ef44 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -53,6 +53,20 @@ static void host2guc_slpc_reset(struct drm_i915_private *dev_priv)
 	host2guc_slpc(dev_priv, data, 4);
 }
 
+static void host2guc_slpc_shutdown(struct drm_i915_private *dev_priv)
+{
+	struct drm_i915_gem_object *obj = dev_priv->guc.slpc.shared_data_obj;
+	u32 data[4];
+	u64 shared_data_gtt_offset = i915_gem_obj_ggtt_offset(obj);
+
+	data[0] = HOST2GUC_ACTION_SLPC_REQUEST;
+	data[1] = SLPC_EVENT(SLPC_EVENT_SHUTDOWN, 2);
+	data[2] = lower_32_bits(shared_data_gtt_offset);
+	data[3] = upper_32_bits(shared_data_gtt_offset);
+
+	host2guc_slpc(dev_priv, data, 4);
+}
+
 static u8 slpc_get_platform_sku(struct drm_i915_gem_object *obj)
 {
 	struct drm_device *dev = obj->base.dev;
@@ -149,12 +163,14 @@ void intel_slpc_cleanup(struct drm_i915_private *dev_priv)
 
 void intel_slpc_suspend(struct drm_i915_private *dev_priv)
 {
-	return;
+	if (intel_slpc_active(dev_priv))
+		host2guc_slpc_shutdown(dev_priv);
 }
 
 void intel_slpc_disable(struct drm_i915_private *dev_priv)
 {
-	return;
+	if (intel_slpc_active(dev_priv))
+		host2guc_slpc_shutdown(dev_priv);
 }
 
 void intel_slpc_enable(struct drm_i915_private *dev_priv)
@@ -170,5 +186,8 @@ void intel_slpc_enable(struct drm_i915_private *dev_priv)
 
 void intel_slpc_reset(struct drm_i915_private *dev_priv)
 {
-	return;
+	if (intel_slpc_active(dev_priv)) {
+		host2guc_slpc_shutdown(dev_priv);
+		host2guc_slpc_reset(dev_priv);
+	}
 }
-- 
1.9.1