[PATCH v6 11/35] drm/i915: Enable and Disable of HDCP2.2

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Considering that HDCP2.2 is more secure than HDCP1.4, When a setup
supports HDCP2.2 and HDCP1.4, HDCP2.2 will be enabled.

When HDCP2.2 enabling fails and HDCP1.4 is supported, HDCP1.4 is
enabled.

This change implements a sequence of enabling and disabling of
HDCP2.2 authentication and HDCP2.2 port encryption.

v2:
  Included few optimization suggestions [Chris Wilson]
  Commit message is updated as per the rebased version.
  intel_wait_for_register is used instead of wait_for. [Chris Wilson]
v3:
  No changes.
v4:
  Extra comment added and Style issue fixed [Uma]
v5:
  Rebased as part of patch reordering.
  HDCP2 encryption status is tracked.
  HW state check is moved into WARN_ON [Daniel]
v6:
  Redefined the mei service functions as per comp redesign.
  Merged patches related to hdcp2.2 enabling and disabling [Sean Paul].
  Required shim functionality is defined [Sean Paul]

Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_drv.h  |   5 +
 drivers/gpu/drm/i915/intel_hdcp.c | 226 ++++++++++++++++++++++++++++++++++++--
 2 files changed, 221 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 38262792813a..21683702bcdc 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -380,6 +380,10 @@ struct intel_hdcp_shim {
 
 	/* Detects the HDCP protocol(DP/HDMI) required on the port */
 	enum hdcp_protocol (*hdcp_protocol)(void);
+
+	/* Detects whether Panel is HDCP2.2 capable */
+	int (*hdcp_2_2_capable)(struct intel_digital_port *intel_dig_port,
+				bool *capable);
 };
 
 struct intel_hdcp {
@@ -393,6 +397,7 @@ struct intel_hdcp {
 	/* HDCP2.2 related definitions */
 	/* Flag indicates whether this connector supports HDCP2.2 or not. */
 	bool hdcp2_supported;
+	bool hdcp2_in_use;
 
 	/*
 	 * Content Stream Type defined by content owner. TYPE0(0x0) content can
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 18509c3bae08..4ace64315baa 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -17,10 +17,51 @@
 #include "i915_reg.h"
 
 #define KEY_LOAD_TRIES	5
+#define TIME_FOR_ENCRYPT_STATUS_CHANGE	32
 #define GET_MEI_DDI_INDEX(port)		(((port) == PORT_A) ? DDI_A : \
 					 (enum hdcp_physical_port)(port))
 
 static int intel_hdcp2_init(struct intel_connector *connector);
+static int _intel_hdcp2_enable(struct intel_connector *connector);
+static int _intel_hdcp2_disable(struct intel_connector *connector);
+static
+int intel_hdcp_read_valid_bksv(struct intel_digital_port *intel_dig_port,
+			       const struct intel_hdcp_shim *shim, u8 *bksv);
+static
+struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector);
+
+/* Is HDCP1.4 capable on Platform and Panel */
+static bool intel_hdcp_capable(struct intel_connector *connector)
+{
+	struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	bool capable = false;
+	u8 bksv[5];
+
+	if (hdcp->shim->hdcp_capable) {
+		hdcp->shim->hdcp_capable(intel_dig_port, &capable);
+	} else {
+		if (!intel_hdcp_read_valid_bksv(intel_dig_port,
+						hdcp->shim, bksv))
+			capable = true;
+	}
+
+	return capable;
+}
+
+/* Is HDCP2.2 capable on Platform and Panel */
+static bool intel_hdcp2_capable(struct intel_connector *connector)
+{
+	struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	bool capable = false;
+
+	/* Check the panel's hdcp2.2 compliance if platform supports it. */
+	if (hdcp->hdcp2_supported)
+		hdcp->shim->hdcp_2_2_capable(intel_dig_port, &capable);
+
+	return capable;
+}
 
 static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
 				    const struct intel_hdcp_shim *shim)
@@ -791,22 +832,33 @@ int intel_hdcp_init(struct intel_connector *connector,
 int intel_hdcp_enable(struct intel_connector *connector)
 {
 	struct intel_hdcp *hdcp = &connector->hdcp;
-	int ret;
+	int ret = -EINVAL;
 
 	if (!hdcp->shim)
 		return -ENOENT;
 
 	mutex_lock(&hdcp->mutex);
 
-	ret = _intel_hdcp_enable(connector);
-	if (ret)
-		goto out;
+	/*
+	 * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
+	 * is capable of HDCP2.2, it is preferred to use HDCP2.2.
+	 */
+	if (intel_hdcp2_capable(connector))
+		ret = _intel_hdcp2_enable(connector);
+
+	/* When HDCP2.2 fails, HDCP1.4 will be attempted */
+	if (ret && intel_hdcp_capable(connector)) {
+		ret = _intel_hdcp_enable(connector);
+		if (!ret)
+			schedule_delayed_work(&hdcp->check_work,
+					      DRM_HDCP_CHECK_PERIOD_MS);
+	}
+
+	if (!ret) {
+		hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+		schedule_work(&hdcp->prop_work);
+	}
 
-	hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
-	schedule_work(&hdcp->prop_work);
-	schedule_delayed_work(&hdcp->check_work,
-			      DRM_HDCP_CHECK_PERIOD_MS);
-out:
 	mutex_unlock(&hdcp->mutex);
 	return ret;
 }
@@ -823,7 +875,10 @@ int intel_hdcp_disable(struct intel_connector *connector)
 
 	if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
 		hdcp->value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
-		ret = _intel_hdcp_disable(connector);
+		if (hdcp->hdcp2_in_use)
+			ret = _intel_hdcp2_disable(connector);
+		else
+			ret = _intel_hdcp_disable(connector);
 	}
 
 	mutex_unlock(&hdcp->mutex);
@@ -923,6 +978,157 @@ int intel_hdcp_check_link(struct intel_connector *connector)
 	return ret;
 }
 
+static int hdcp2_close_mei_session(struct intel_connector *connector)
+{
+	struct mei_hdcp_data *data = &connector->hdcp.mei_data;
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct i915_component_master *comp = dev_priv->comp_master;
+
+	if (!comp)
+		return -EINVAL;
+
+	if (!comp->hdcp_ops || !comp->mei_cldev || data->port == INVALID_PORT)
+		return -EINVAL;
+
+	return comp->hdcp_ops->close_hdcp_session(comp->mei_cldev, data);
+}
+
+static int hdcp2_deauthenticate_port(struct intel_connector *connector)
+{
+	return hdcp2_close_mei_session(connector);
+}
+
+static int hdcp2_authenticate_sink(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	DRM_ERROR("Sink authentication is done in subsequent patches\n");
+	return -EINVAL;
+}
+
+static int hdcp2_enable_encryption(struct intel_connector *connector)
+{
+	struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	enum port port = connector->encoder->port;
+	int ret;
+
+	WARN_ON(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS);
+
+	if (hdcp->shim->toggle_signalling)
+		hdcp->shim->toggle_signalling(intel_dig_port, true);
+
+	if (I915_READ(HDCP2_STATUS_DDI(port)) & LINK_AUTH_STATUS) {
+		/* Link is Authenticated. Now set for Encryption */
+		I915_WRITE(HDCP2_CTL_DDI(port),
+			   I915_READ(HDCP2_CTL_DDI(port)) |
+			   CTL_LINK_ENCRYPTION_REQ);
+	}
+
+	ret = intel_wait_for_register(dev_priv, HDCP2_STATUS_DDI(port),
+				      LINK_ENCRYPTION_STATUS,
+				      LINK_ENCRYPTION_STATUS,
+				      TIME_FOR_ENCRYPT_STATUS_CHANGE);
+
+	return ret;
+}
+
+static int hdcp2_disable_encryption(struct intel_connector *connector)
+{
+	struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	enum port port = connector->encoder->port;
+	int ret;
+
+	WARN_ON(!(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS));
+
+	I915_WRITE(HDCP2_CTL_DDI(port),
+		   I915_READ(HDCP2_CTL_DDI(port)) & ~CTL_LINK_ENCRYPTION_REQ);
+
+	ret = intel_wait_for_register(dev_priv, HDCP2_STATUS_DDI(port),
+				      LINK_ENCRYPTION_STATUS, 0x0,
+				      TIME_FOR_ENCRYPT_STATUS_CHANGE);
+	if (ret == -ETIMEDOUT)
+		DRM_DEBUG_KMS("Disable Encryption Timedout");
+
+	if (hdcp->shim->toggle_signalling)
+		hdcp->shim->toggle_signalling(intel_dig_port, false);
+
+	return ret;
+}
+
+static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
+{
+	int ret, i, tries = 3;
+
+	for (i = 0; i < tries; i++) {
+		ret = hdcp2_authenticate_sink(connector);
+		if (!ret)
+			break;
+
+		/* Clearing the mei hdcp session */
+		hdcp2_deauthenticate_port(connector);
+		DRM_DEBUG_KMS("HDCP2.2 Auth %d of %d Failed.(%d)\n",
+			      i + 1, tries, ret);
+	}
+
+	if (i != tries) {
+		/*
+		 * 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(connector);
+		if (ret < 0) {
+			DRM_DEBUG_KMS("Encryption Enable Failed.(%d)\n", ret);
+			hdcp2_deauthenticate_port(connector);
+		}
+	}
+
+	return ret;
+}
+
+static int _intel_hdcp2_enable(struct intel_connector *connector)
+{
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	int ret;
+
+	DRM_DEBUG_KMS("[%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(connector);
+	if (ret) {
+		DRM_ERROR("HDCP2 Type%d  Enabling Failed. (%d)\n",
+			  hdcp->content_type, ret);
+		return ret;
+	}
+
+	DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is enabled. Type %d\n",
+		      connector->base.name, connector->base.base.id,
+		      hdcp->content_type);
+
+	hdcp->hdcp2_in_use = true;
+	return 0;
+}
+
+static int _intel_hdcp2_disable(struct intel_connector *connector)
+{
+	int ret;
+
+	DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is being Disabled\n",
+		      connector->base.name, connector->base.base.id);
+
+	ret = hdcp2_disable_encryption(connector);
+
+	hdcp2_deauthenticate_port(connector);
+	connector->hdcp.hdcp2_in_use = false;
+
+	return ret;
+}
+
 static int i915_hdcp_component_match(struct device *dev, void *data)
 {
 	return !strcmp(dev->driver->name, "mei_hdcp");
-- 
2.7.4

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