Quoting Ramalingam C (2018-02-14 14:13:45)
> Implements the enable and disable functions for HDCP2.2 encryption
> of the PORT.
> 
> Signed-off-by: Ramalingam C <ramalinga...@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);

Both of these wait_for are intel_wait_for_register. As a rule of thumb
avoid new (and definitely not repeated) use of wait_for().
-Chris
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