Implements a sequence of enabling and disabling the HDCP2.2 (auth and encryption).
v2: Rebased. v3: No Changes. v4: No Changes. v5: Rebased as part of the patch reordering. HDCP2 encryption status is tracked.
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/gpu/drm/i915/intel_hdcp.c | 105 +++++++++++++++++++++++++++++++++++++- 1 file changed, 104 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 34bafc2025f7..f72684488bc7 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -994,14 +994,117 @@ 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_hdcp_component *comp = dev_priv->hdcp_comp; + int ret; + + if (!comp) + return -EINVAL; + + mutex_lock(&comp->mutex); + if (!comp->ops || !comp->mei_cldev || data->port == INVALID_PORT) { + mutex_unlock(&comp->mutex); + return -EINVAL; + } + ret = comp->ops->close_hdcp_session(comp->mei_cldev, data); + mutex_unlock(&comp->mutex); + + return ret; +} + +static int hdcp2_deauthenticate_port(struct intel_connector *connector) +{ + return hdcp2_close_mei_session(connector); +} + +static int hdcp2_authenticate_sink(struct intel_connector *connector) +{ + return 0; +} + +static int hdcp2_enable_encryption(struct intel_connector *connector) +{ + return 0; +} + +static int hdcp2_disable_encryption(struct intel_connector *connector) +{ + return 0; +} + +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; + hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED; + schedule_work(&hdcp->hdcp_prop_work); return 0; }
static int _intel_hdcp2_disable(struct intel_connector *connector) { - return 0; + 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_master_bind(struct device *dev)