[Intel-gfx] [PATCH 2/3] drm/i915/hdcp: read RxInfo once when reading RepeaterAuth_Send_ReceiverID_List
Juston Li
juston.li at intel.com
Tue Aug 10 21:58:45 UTC 2021
From: Juston Li <juston.li at intel.com>
Date: Mon, 9 Aug 2021 12:55:06 -0700
Subject: [Intel-gfx] [PATCH 3/3] drm/i915/hdcp: reuse rx_info for mst stream
type1 capability check
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.
Signed-off-by: Juston Li <juston.li at intel.com>
---
.../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 | 47 +++++++++----------
3 files changed, 23 insertions(+), 65 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..fa6a60faa6a7 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,
@@ -1931,16 +1936,6 @@ 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
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