[PATCH v3 5/8] drm/i915: Optimize HDCP key load

[Ramalingam C <ramalingam.c@intel.com>]

HDCP key need not be cleared on each hdcp disable. And HDCP key Load
is skipped if key is already loaded.

v2:
  No change. Added Reviewed-by tag.

v3:
  No change.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index b1047dbf3393..65bdb95c0ad7 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -49,6 +49,10 @@ static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv)
 	int ret;
 	u32 val;
 
+	val = I915_READ(HDCP_KEY_STATUS);
+	if ((val & HDCP_KEY_LOAD_DONE) && (val & HDCP_KEY_LOAD_STATUS))
+		return 0;
+
 	/*
 	 * On HSW and BDW HW loads the HDCP1.4 Key when Display comes
 	 * out of reset. So if Key is not already loaded, its an error state.
@@ -545,8 +549,6 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
 		return -ETIMEDOUT;
 	}
 
-	intel_hdcp_clear_keys(dev_priv);
-
 	ret = connector->hdcp_shim->toggle_signalling(intel_dig_port, false);
 	if (ret) {
 		DRM_ERROR("Failed to disable HDCP signalling\n");
-- 
2.7.4

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