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] v3: No Changes. v4: Debug msg is added for timeout at Disable of Encryption [Uma] %s/HDCP2_CTL/HDCP2_CTL v5: Rebased as part of patch reordering. HW state check is moved into WARN_ON [Daniel]
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/gpu/drm/i915/intel_hdcp.c | 48 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 46 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index f72684488bc7..1e75b4fc978a 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -17,6 +17,7 @@ #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))
@@ -1027,12 +1028,55 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector)
static int hdcp2_enable_encryption(struct intel_connector *connector) { - return 0; + 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->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_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) { - return 0; + 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->hdcp_shim->toggle_signalling) + hdcp->hdcp_shim->toggle_signalling(intel_dig_port, false); + + return ret; }
static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)