[PATCH 31/43] drm/i915: Implement HDCP2.2 En/Dis-able

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

Implements a sequence of enabling and disabling the HDCP2.2
(auth and encryption).

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 70 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 6a0506cdefd5..8bf30513713a 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -22,6 +22,9 @@
 #define HDCP2_LC_RETRY_CNT		3
 #define TIME_FOR_ENCRYPT_STATUS_CHANGE	32
 
+static int _intel_hdcp2_enable(struct intel_hdcp *hdcp);
+static int _intel_hdcp2_disable(struct intel_hdcp *hdcp);
+
 static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
 				    const struct intel_hdcp_shim *shim)
 {
@@ -1386,3 +1389,70 @@ static int hdcp2_disable_encryption(struct intel_hdcp *hdcp)
 
 	return ret;
 }
+
+static int hdcp2_authenticate_and_encrypt(struct intel_hdcp *hdcp)
+{
+	int ret, i, tries = 3;
+
+	for (i = 0; i < tries; i++) {
+		ret = hdcp2_authenticate_sink(hdcp);
+		if (!ret)
+			break;
+
+		/* Clearing the mei hdcp session */
+		hdcp2_deauthenticate_port(hdcp);
+		DRM_DEBUG_KMS("HDCP2.2 Reauth %d of %d\n", i + 1, tries);
+	}
+
+	if (!ret) {
+
+		/*
+		 * Ensuring the required 200mSec min time interval between
+		 * Session Key Exchange and encryption.
+		 */
+		msleep(HDCP_2_2_DELAY_BEFORE_ENCRYPTION_EN);
+		ret = hdcp2_enable_encryption(hdcp);
+		if (ret < 0)
+			DRM_DEBUG_KMS("Encryption Enable Failed. %d\n", ret);
+	}
+
+	return ret;
+}
+
+static int _intel_hdcp2_disable(struct intel_hdcp *hdcp)
+{
+	int ret;
+
+	DRM_ERROR("[%s:%d] HDCP2.2 is being Disabled\n",
+		  hdcp->connector->base.name, hdcp->connector->base.base.id);
+
+	ret = hdcp2_disable_encryption(hdcp);
+
+	hdcp2_deauthenticate_port(hdcp);
+
+	return ret;
+}
+
+static int _intel_hdcp2_enable(struct intel_hdcp *hdcp)
+{
+	struct intel_connector *connector = hdcp->connector;
+	int ret;
+
+	DRM_INFO("[%s:%d] HDCP2.2 is being enabled. Type: %d\n",
+		 connector->base.name, connector->base.base.id,
+		 hdcp->content_type);
+
+	ret = hdcp2_authenticate_and_encrypt(hdcp);
+	if (ret) {
+		DRM_ERROR("HDCP2 Enabling Failed. (%d)\n", ret);
+		return ret;
+	}
+
+	DRM_INFO("[%s:%d] HDCP2.2 is enabled. Type %d\n", connector->base.name,
+		 connector->base.base.id, hdcp->content_type);
+
+	hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+	schedule_work(&hdcp->hdcp_prop_work);
+
+	return 0;
+}
-- 
2.7.4

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