On 2020-12-10 at 11:56:30 +0530, Anshuman Gupta wrote:
> Enable HDCP 1.4 DP MST stream encryption.
IMHO tile of "Configure HDCP1.4 MST steram encryption status" would suit
more.
But i leave that to your call.
>
> 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.
> v5:
> - uniformity for connector detail in DMESG. [Ram]
> - comments improvement. [Ram]
>
Patch LGTM.
Reviewed-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> Tested-by: Karthik B S <karthik.b.s@xxxxxxxxx>
> Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_hdcp.c | 38 +++++++++++++++--------
> 1 file changed, 25 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 6e6465b4ecfa..fce444d69521 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -766,10 +766,17 @@ 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, "[%s:%d] Failed to enable HDCP 1.4 stream enc\n",
> + connector->base.name, connector->base.base.id);
> + 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 +798,23 @@ 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, "[%s:%d] Failed to disable HDCP 1.4 stream enc\n",
> + connector->base.name, connector->base.base.id);
> + 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
> + * until it disabled HDCP encryption for all connectors in MST topology.
> */
> - 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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