On 2021-08-10 at 16:52:12 -0700, Juston Li wrote:
> On some MST docking stations, rx_info can only be read after
> RepeaterAuth_Send_ReceiverID_List and the RxStatus READY bit is set
> otherwise the read will return -EIO.
>
> This behavior causes the mst stream type1 capability test to fail to
> read rx_info and determine if the topology supports type1 and fallback
> to type0.
>
> To fix this, check for type1 capability when we receive rx_info within
> the AKE flow when we read RepeaterAuth_Send_ReceiverID_List instead
> of an explicit read just for type1 capability checking.
>
> This does require moving where we set stream_types to after
> hdcp2_authenticate_sink() when we get rx_info but this occurs before we
> do hdcp2_propagate_stream_management_info.
>
> Also, legacy HDCP 2.0/2.1 are not type 1 capable either so check for
> that as well.
>
> Changes since v2:
> - Remove no longer used variables in _intel_hdcp2_enable()
LGTM.
Reviewed-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
>
> Signed-off-by: Juston Li <juston.li@xxxxxxxxx>
> ---
> .../drm/i915/display/intel_display_types.h | 2 +
> drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 39 ---------------
> drivers/gpu/drm/i915/display/intel_hdcp.c | 49 ++++++++-----------
> 3 files changed, 23 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index dbdfe54d0340..c8b687ff0374 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -516,6 +516,8 @@ struct intel_hdcp {
> enum transcoder cpu_transcoder;
> /* Only used for DP MST stream encryption */
> enum transcoder stream_transcoder;
> +
> + bool topology_type1_capable;
> };
>
> struct intel_connector {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
> index 526fd58b9b51..2d39af63ec9b 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
> @@ -478,23 +478,6 @@ int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port,
> return size;
> }
>
> -static int
> -get_rxinfo_hdcp_1_dev_downstream(struct intel_digital_port *dig_port, bool *hdcp_1_x)
> -{
> - u8 rx_info[HDCP_2_2_RXINFO_LEN];
> - int ret;
> -
> - ret = drm_dp_dpcd_read(&dig_port->dp.aux,
> - DP_HDCP_2_2_REG_RXINFO_OFFSET,
> - (void *)rx_info, HDCP_2_2_RXINFO_LEN);
> -
> - if (ret != HDCP_2_2_RXINFO_LEN)
> - return ret >= 0 ? -EIO : ret;
> -
> - *hdcp_1_x = HDCP_2_2_HDCP1_DEVICE_CONNECTED(rx_info[1]) ? true : false;
> - return 0;
> -}
> -
> static
> ssize_t get_receiver_id_list_rx_info(struct intel_digital_port *dig_port, u32 *dev_cnt, u8 *byte)
> {
> @@ -664,27 +647,6 @@ int intel_dp_hdcp2_capable(struct intel_digital_port *dig_port,
> return 0;
> }
>
> -static
> -int intel_dp_mst_streams_type1_capable(struct intel_connector *connector,
> - bool *capable)
> -{
> - struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> - struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> - int ret;
> - bool hdcp_1_x;
> -
> - ret = get_rxinfo_hdcp_1_dev_downstream(dig_port, &hdcp_1_x);
> - if (ret) {
> - drm_dbg_kms(&i915->drm,
> - "[%s:%d] failed to read RxInfo ret=%d\n",
> - connector->base.name, connector->base.base.id, ret);
> - return ret;
> - }
> -
> - *capable = !hdcp_1_x;
> - return 0;
> -}
> -
> static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
> .write_an_aksv = intel_dp_hdcp_write_an_aksv,
> .read_bksv = intel_dp_hdcp_read_bksv,
> @@ -833,7 +795,6 @@ static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
> .stream_2_2_encryption = intel_dp_mst_hdcp2_stream_encryption,
> .check_2_2_link = intel_dp_mst_hdcp2_check_link,
> .hdcp_2_2_capable = intel_dp_hdcp2_capable,
> - .streams_type1_capable = intel_dp_mst_streams_type1_capable,
> .protocol = HDCP_PROTOCOL_DP,
> };
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index ebc2e32aec0b..1a2a98e2c6e3 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -33,21 +33,6 @@ static int intel_conn_to_vcpi(struct intel_connector *connector)
> return connector->port ? connector->port->vcpi.vcpi : 0;
> }
>
> -static bool
> -intel_streams_type1_capable(struct intel_connector *connector)
> -{
> - const struct intel_hdcp_shim *shim = connector->hdcp.shim;
> - bool capable = false;
> -
> - if (!shim)
> - return capable;
> -
> - if (shim->streams_type1_capable)
> - shim->streams_type1_capable(connector, &capable);
> -
> - return capable;
> -}
> -
> /*
> * intel_hdcp_required_content_stream selects the most highest common possible HDCP
> * content_type for all streams in DP MST topology because security f/w doesn't
> @@ -86,7 +71,7 @@ intel_hdcp_required_content_stream(struct intel_digital_port *dig_port)
> if (conn_dig_port != dig_port)
> continue;
>
> - if (!enforce_type0 && !intel_streams_type1_capable(connector))
> + if (!enforce_type0 && !connector->hdcp.topology_type1_capable)
> enforce_type0 = true;
>
> data->streams[data->k].stream_id = intel_conn_to_vcpi(connector);
> @@ -1632,6 +1617,14 @@ int hdcp2_authenticate_repeater_topology(struct intel_connector *connector)
> return -EINVAL;
> }
>
> + /*
> + * A topology is not Type 1 capable if it contains a downstream device
> + * that is HDCP 1.x or Legacy HDCP 2.0/2.1 compliant.
> + */
> + hdcp->topology_type1_capable =
> + !HDCP_2_2_HDCP1_DEVICE_CONNECTED(rx_info[1]) &&
> + !HDCP_2_2_HDCP_2_0_REP_CONNECTED(rx_info[1]);
> +
> /* Converting and Storing the seq_num_v to local variable as DWORD */
> seq_num_v =
> drm_hdcp_be24_to_cpu((const u8 *)msgs.recvid_list.seq_num_v);
> @@ -1871,11 +1864,23 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
> {
> struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> struct drm_i915_private *i915 = to_i915(connector->base.dev);
> + struct hdcp_port_data *data = &dig_port->hdcp_port_data;
> + struct intel_hdcp *hdcp = &connector->hdcp;
> int ret = 0, i, tries = 3;
>
> for (i = 0; i < tries && !dig_port->hdcp_auth_status; i++) {
> ret = hdcp2_authenticate_sink(connector);
> if (!ret) {
> + /* Stream which requires encryption */
> + if (!intel_encoder_is_mst(intel_attached_encoder(connector))) {
> + data->k = 1;
> + data->streams[0].stream_type = hdcp->content_type;
> + } else {
> + ret = intel_hdcp_required_content_stream(dig_port);
> + if (ret)
> + return ret;
> + }
> +
> ret = hdcp2_propagate_stream_management_info(connector);
> if (ret) {
> drm_dbg_kms(&i915->drm,
> @@ -1921,9 +1926,7 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
>
> static int _intel_hdcp2_enable(struct intel_connector *connector)
> {
> - struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> struct drm_i915_private *i915 = to_i915(connector->base.dev);
> - struct hdcp_port_data *data = &dig_port->hdcp_port_data;
> struct intel_hdcp *hdcp = &connector->hdcp;
> int ret;
>
> @@ -1931,16 +1934,6 @@ static int _intel_hdcp2_enable(struct intel_connector *connector)
> connector->base.name, connector->base.base.id,
> hdcp->content_type);
>
> - /* Stream which requires encryption */
> - if (!intel_encoder_is_mst(intel_attached_encoder(connector))) {
> - data->k = 1;
> - data->streams[0].stream_type = hdcp->content_type;
> - } else {
> - ret = intel_hdcp_required_content_stream(dig_port);
> - if (ret)
> - return ret;
> - }
> -
> ret = hdcp2_authenticate_and_encrypt(connector);
> if (ret) {
> drm_dbg_kms(&i915->drm, "HDCP2 Type%d Enabling Failed. (%d)\n",
> --
> 2.31.1
>
