[PATCH 13/24] 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.

v1: Return void instead of ignored error code (Paulo)
    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)

Reviewed-by: David Weinehall <david.weinehall at linux.intel.com>
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 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index b6de200..637eacb 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -52,6 +52,19 @@ 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)
+{
+	u32 data[4];
+	u32 shared_data_gtt_offset = i915_ggtt_offset(dev_priv->guc.slpc.vma);
+
+	data[0] = HOST2GUC_ACTION_SLPC_REQUEST;
+	data[1] = SLPC_EVENT(SLPC_EVENT_SHUTDOWN, 2);
+	data[2] = shared_data_gtt_offset;
+	data[3] = 0;
+
+	host2guc_slpc(dev_priv, data, 4);
+}
+
 static unsigned int slpc_get_platform_sku(struct drm_i915_private *dev_priv)
 {
 	enum slpc_platform_sku platform_sku;
@@ -153,10 +166,14 @@ void intel_slpc_cleanup(struct drm_i915_private *dev_priv)
 
 void intel_slpc_suspend(struct drm_i915_private *dev_priv)
 {
+	host2guc_slpc_shutdown(dev_priv);
+	dev_priv->guc.slpc.enabled = false;
 }
 
 void intel_slpc_disable(struct drm_i915_private *dev_priv)
 {
+	host2guc_slpc_shutdown(dev_priv);
+	dev_priv->guc.slpc.enabled = false;
 }
 
 void intel_slpc_enable(struct drm_i915_private *dev_priv)
@@ -167,4 +184,6 @@ void intel_slpc_enable(struct drm_i915_private *dev_priv)
 
 void intel_slpc_reset(struct drm_i915_private *dev_priv)
 {
+	host2guc_slpc_shutdown(dev_priv);
+	dev_priv->guc.slpc.enabled = false;
 }
-- 
1.9.1