[PATCH 1/5] drm/i915/hdcp: Move to direct reads for HDCP

[Suraj Kandpal]

Even for MST scenarios we need to do direct reads only on the
immediate downstream device the rest of the authentication is taken
care by that device. Remote reads will only be used to check
capability of the monitors in MST topology.

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index 3a595cd433d4..bec49061b2e1 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -331,11 +331,11 @@ static const struct hdcp2_dp_msg_data hdcp2_dp_msg_data[] = {
 };
 
 static struct drm_dp_aux *
-intel_dp_hdcp_get_aux(struct intel_connector *connector)
+intel_dp_hdcp_get_aux(struct intel_connector *connector, bool remote_req)
 {
 	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 
-	if (intel_encoder_is_mst(connector->encoder))
+	if (intel_encoder_is_mst(connector->encoder) && remote_req)
 		return &connector->port->aux;
 	else
 		return &dig_port->dp.aux;
@@ -346,7 +346,7 @@ intel_dp_hdcp2_read_rx_status(struct intel_connector *connector,
 			      u8 *rx_status)
 {
 	struct drm_i915_private *i915 = to_i915(connector->base.dev);
-	struct drm_dp_aux *aux = intel_dp_hdcp_get_aux(connector);
+	struct drm_dp_aux *aux = intel_dp_hdcp_get_aux(connector, false);
 	ssize_t ret;
 
 	ret = drm_dp_dpcd_read(aux,
@@ -463,7 +463,7 @@ int intel_dp_hdcp2_write_msg(struct intel_connector *connector,
 
 	offset = hdcp2_msg_data->offset;
 
-	aux = intel_dp_hdcp_get_aux(connector);
+	aux = intel_dp_hdcp_get_aux(connector, false);
 
 	/* No msg_id in DP HDCP2.2 msgs */
 	bytes_to_write = size - 1;
@@ -490,7 +490,7 @@ static
 ssize_t get_receiver_id_list_rx_info(struct intel_connector *connector,
 				     u32 *dev_cnt, u8 *byte)
 {
-	struct drm_dp_aux *aux = intel_dp_hdcp_get_aux(connector);
+	struct drm_dp_aux *aux = intel_dp_hdcp_get_aux(connector, false);
 	ssize_t ret;
 	u8 *rx_info = byte;
 
@@ -530,7 +530,7 @@ int intel_dp_hdcp2_read_msg(struct intel_connector *connector,
 		return -EINVAL;
 	offset = hdcp2_msg_data->offset;
 
-	aux = intel_dp_hdcp_get_aux(connector);
+	aux = intel_dp_hdcp_get_aux(connector, false);
 
 	ret = intel_dp_hdcp2_wait_for_msg(connector, hdcp2_msg_data);
 	if (ret < 0)
@@ -655,7 +655,7 @@ int intel_dp_hdcp2_capable(struct intel_connector *connector,
 	u8 rx_caps[3];
 	int ret;
 
-	aux = intel_dp_hdcp_get_aux(connector);
+	aux = intel_dp_hdcp_get_aux(connector, true);
 
 	*capable = false;
 	ret = drm_dp_dpcd_read(aux,
-- 
2.25.1