Implements the enable and disable functions for HDCP2.2 encryption of the PORT.
v2: intel_wait_for_register is used instead of wait_for. [Chris Wilson]
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/gpu/drm/i915/intel_hdcp.c | 54 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 53314f8e491a..38cecf533cb9 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -19,6 +19,7 @@ (enum physical_port) (port)) #define KEY_LOAD_TRIES 5 #define HDCP2_LC_RETRY_CNT 3 +#define TIME_FOR_ENCRYPT_STATUS_CHANGE 32
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port, const struct intel_hdcp_shim *shim) @@ -1330,3 +1331,56 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector)
return ret; } + +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; + + if (I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS) + return 0; + + if (hdcp->hdcp_shim->toggle_signalling) + hdcp->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_CTR_DDI(port), + I915_READ(HDCP2_CTR_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; + + if (!(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS)) + return 0; + + I915_WRITE(HDCP2_CTR_DDI(port), + I915_READ(HDCP2_CTR_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 (hdcp->hdcp_shim->toggle_signalling) + hdcp->hdcp_shim->toggle_signalling(intel_dig_port, false); + + return ret; +}