>-----Original Message-----
>From: dri-devel [mailto:[email protected]] On Behalf Of
>Ramalingam C
>Sent: Tuesday, April 3, 2018 7:28 PM
>To: [email protected]; [email protected];
>[email protected]; [email protected]; [email protected];
>[email protected]; Winkler, Tomas <[email protected]>;
>Usyskin, Alexander <[email protected]>
>Cc: Vivi, Rodrigo <[email protected]>
>Subject: [PATCH v3 25/40] drm/i915: Enable and Disable HDCP2.2 port encryption
>
>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.
>
>Signed-off-by: Ramalingam C <[email protected]>
>---
> 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 d70320da85e4..91cac643f083 100644
>--- a/drivers/gpu/drm/i915/intel_hdcp.c
>+++ b/drivers/gpu/drm/i915/intel_hdcp.c
>@@ -19,6 +19,7 @@
> (enum hdcp_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)
Print a message saying "Encryption Already enabled" .
>+ return 0;
>+
>+ if (hdcp->hdcp_shim->toggle_signalling)
Check for "hdcp->hdcp_shim" as well.
>+ 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);
Print a message in case of timeout.
>+ 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))
Put a info message saying "Already Disabled" .
>+ 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 this times out, do we still need to toggle the signalling ?
>+
>+ if (hdcp->hdcp_shim->toggle_signalling)
Check for validity of " hdcp->hdcp_shim".
>+ hdcp->hdcp_shim->toggle_signalling(intel_dig_port, false);
>+
>+ return ret;
>+}
>--
>2.7.4
>
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