[PATCH 15/28] 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)
    Added SLPC state update during disable, suspend and reset.
    Changed semantics of reset. It is supposed to just disable. (Sagar)

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 | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index f41bf18..4c9ab01 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;
+	host2guc_slpc_shutdown(dev_priv);
+	dev_priv->guc.slpc.enabled = false;
 }
 
 void intel_slpc_disable(struct drm_i915_private *dev_priv)
 {
-	return;
+	host2guc_slpc_shutdown(dev_priv);
+	dev_priv->guc.slpc.enabled = false;
 }
 
 void intel_slpc_enable(struct drm_i915_private *dev_priv)
@@ -170,5 +186,6 @@ void intel_slpc_enable(struct drm_i915_private *dev_priv)
 
 void intel_slpc_reset(struct drm_i915_private *dev_priv)
 {
-	return;
+	host2guc_slpc_shutdown(dev_priv);
+	dev_priv->guc.slpc.enabled = false;
 }
-- 
1.9.1