[PATCH 30/43] drm/i915: Enable and Disable HDCP2.2 port encryption

Ramalingam C
2018-02-14T14:20:57Z

Implements the enable and disable functions for HDCP2.2 encryption
of the PORT.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/gpu/drm/i915/intel_hdcp.c | 50 +++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 0cd637dd3f6b..6a0506cdefd5 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -20,6 +20,7 @@
(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)
@@ -1336,3 +1337,52 @@ static int hdcp2_authenticate_sink(struct intel_hdcp *hdcp)

return ret;
}
+
+static int hdcp2_enable_encryption(struct intel_hdcp *hdcp)
+{
+ struct intel_digital_port *intel_dig_port =
+ conn_to_dig_port(hdcp->connector);
+ struct drm_i915_private *dev_priv = to_i915(hdcp->connector->base.dev);
+ enum port port = hdcp->connector->encoder->port;
+ int ret;
+
+ if (I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS)
+ return 0;
+
+ if (hdcp->hdcp2_shim->toggle_signalling)
+ hdcp->hdcp2_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 = wait_for(I915_READ(HDCP2_STATUS_DDI(port)) &
+ LINK_ENCRYPTION_STATUS, TIME_FOR_ENCRYPT_STATUS_CHANGE);
+ return ret;
+}
+
+static int hdcp2_disable_encryption(struct intel_hdcp *hdcp)
+{
+ struct intel_digital_port *intel_dig_port =
+ conn_to_dig_port(hdcp->connector);
+ struct drm_i915_private *dev_priv = to_i915(hdcp->connector->base.dev);
+ enum port port = hdcp->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 = wait_for(!(I915_READ(HDCP2_STATUS_DDI(port)) &
+ LINK_ENCRYPTION_STATUS), TIME_FOR_ENCRYPT_STATUS_CHANGE);
+
+ if (hdcp->hdcp2_shim->toggle_signalling)
+ hdcp->hdcp2_shim->toggle_signalling(intel_dig_port, false);
+
+ return ret;
+}