On 2020-11-11 at 11:50:41 +0530, Anshuman Gupta wrote:
> Enable HDCP 1.4 DP MST stream encryption.
>
> Enable stream encryption once encryption is enabled on
> the DP transport driving the link for each stream which
> has requested encryption.
>
> Disable stream encryption for each stream that no longer
> requires encryption before disabling HDCP encryption on
> the link.
>
> v2:
> - Added debug print for stream encryption.
> - Disable the hdcp on port after disabling last stream
> encryption.
> v3:
> - Cosmetic change, removed the value less comment. [Uma]
> v4:
> - Split the Gen12 HDCP enablement patch. [Ram]
> - Add connector details in drm_err.
>
> Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_hdcp.c | 45 ++++++++++++++++-------
> 1 file changed, 31 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 0322a83c151d..e12bd0ac9fb5 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -612,7 +612,12 @@ int intel_hdcp_auth_downstream(struct intel_connector *connector)
> return ret;
> }
>
> -/* Implements Part 1 of the HDCP authorization procedure */
> +/*
> + * Implements Part 1 of the HDCP authorization procedure.
> + * Authentication Part 1 steps for Multi-stream DisplayPort.
> + * Step 1. Auth Part 1 sequence on the driving MST Trasport Link.
> + * Step 2. Enable encryption for each stream that requires encryption.
> +1*/
IMO this function is generic for SST and MST. Why do we document only
for MST at the top of the function? We can remove them.
> static int intel_hdcp_auth(struct intel_connector *connector)
> {
> struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> @@ -766,10 +771,17 @@ static int intel_hdcp_auth(struct intel_connector *connector)
> return -ETIMEDOUT;
> }
>
> - /*
> - * XXX: If we have MST-connected devices, we need to enable encryption
> - * on those as well.
> - */
> + /* DP MST Auth Part 1 Step 2.a and Step 2.b */
> + if (shim->stream_encryption) {
> + ret = shim->stream_encryption(connector, true);
> + if (ret) {
> + drm_err(&dev_priv->drm, "[CONNECTOR:%d:%s] Failed to enable HDCP 1.4 stream enc\n",
All the existing error messgae has the %s:%d, why are we changing it
here? Could we retain the uniformity?
> + connector->base.base.id, connector->base.name);
> + return ret;
> + }
> + drm_dbg_kms(&dev_priv->drm, "HDCP 1.4 transcoder: %s stream encrypted\n",
> + transcoder_name(hdcp->stream_transcoder));
> + }
>
> if (repeater_present)
> return intel_hdcp_auth_downstream(connector);
> @@ -791,18 +803,23 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
> drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP is being disabled...\n",
> connector->base.name, connector->base.base.id);
>
> + if (hdcp->shim->stream_encryption) {
> + ret = hdcp->shim->stream_encryption(connector, false);
> + if (ret) {
> + drm_err(&dev_priv->drm, "[CONNECTOR:%d:%s] Failed to disable HDCP 1.4 stream enc\n",
same here. remove CONNECTOR ?
> + connector->base.base.id, connector->base.name);
> + return ret;
> + }
> + drm_dbg_kms(&dev_priv->drm, "HDCP 1.4 transcoder: %s stream encryption disabled\n",
> + transcoder_name(hdcp->stream_transcoder));
> + }
> +
> /*
> - * If there are other connectors on this port using HDCP, don't disable
> - * it. Instead, toggle the HDCP signalling off on that particular
> - * connector/pipe and exit.
> + * If there are other connectors on this port using HDCP, don't disable it.
> + * Repeat steps 1-2 for each stream that no longer requires encryption.
What is this steps 1-2 here!? Here you are not disabling if other
streams are encrpted. May be you want to put something like "Untill all
steams of MST stopped encrypting, dont disable the port encryption"
-Ram
> */
> - if (dig_port->num_hdcp_streams > 0) {
> - ret = hdcp->shim->toggle_signalling(dig_port,
> - cpu_transcoder, false);
> - if (ret)
> - DRM_ERROR("Failed to disable HDCP signalling\n");
> + if (dig_port->num_hdcp_streams > 0)
> return ret;
> - }
>
> hdcp->hdcp_encrypted = false;
> intel_de_write(dev_priv, HDCP_CONF(dev_priv, cpu_transcoder, port), 0);
> --
> 2.26.2
>
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