drm/amd/display: Fix HDCP SEND AKI INIT error

[why]
HDCP sends AKI INIT error in case of multiple display on dock

[how]
Add new checks and method to handle display adjustment
for multiple display cases
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ahmad Othman <ahmad.othman@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c

@@ -251,6 +251,33 @@ static enum mod_hdcp_status reset_connection(struct mod_hdcp *hdcp,
 	return status;
 }
 
+static enum mod_hdcp_status update_display_adjustments(struct mod_hdcp *hdcp,
+		struct mod_hdcp_display *display,
+		struct mod_hdcp_display_adjustment *adj)
+{
+	enum mod_hdcp_status status = MOD_HDCP_STATUS_NOT_IMPLEMENTED;
+
+	if (is_in_authenticated_states(hdcp) &&
+			is_dp_mst_hdcp(hdcp) &&
+			display->adjust.disable == true &&
+			adj->disable == false) {
+		display->adjust.disable = false;
+		if (is_hdcp1(hdcp))
+			status = mod_hdcp_hdcp1_enable_dp_stream_encryption(hdcp);
+		else if (is_hdcp2(hdcp))
+			status = mod_hdcp_hdcp2_enable_dp_stream_encryption(hdcp);
+
+		if (status != MOD_HDCP_STATUS_SUCCESS)
+			display->adjust.disable = true;
+	}
+
+	if (status == MOD_HDCP_STATUS_SUCCESS &&
+		memcmp(adj, &display->adjust,
+		sizeof(struct mod_hdcp_display_adjustment)) != 0)
+		status = MOD_HDCP_STATUS_NOT_IMPLEMENTED;
+
+	return status;
+}
 /*
  * Implementation of functions in mod_hdcp.h
  */
@@ -391,7 +418,7 @@ enum mod_hdcp_status mod_hdcp_remove_display(struct mod_hdcp *hdcp,
 	return status;
 }
 
-enum mod_hdcp_status mod_hdcp_update_authentication(struct mod_hdcp *hdcp,
+enum mod_hdcp_status mod_hdcp_update_display(struct mod_hdcp *hdcp,
 		uint8_t index,
 		struct mod_hdcp_link_adjustment *link_adjust,
 		struct mod_hdcp_display_adjustment *display_adjust,
@@ -419,6 +446,15 @@ enum mod_hdcp_status mod_hdcp_update_authentication(struct mod_hdcp *hdcp,
 		goto out;
 	}
 
+	if (memcmp(link_adjust, &hdcp->connection.link.adjust,
+			sizeof(struct mod_hdcp_link_adjustment)) == 0 &&
+			memcmp(display_adjust, &display->adjust,
+					sizeof(struct mod_hdcp_display_adjustment)) != 0) {
+		status = update_display_adjustments(hdcp, display, display_adjust);
+		if (status != MOD_HDCP_STATUS_NOT_IMPLEMENTED)
+			goto out;
+	}
+
 	/* stop current authentication */
 	status = reset_authentication(hdcp, output);
 	if (status != MOD_HDCP_STATUS_SUCCESS)

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.h

@@ -445,6 +445,14 @@ static inline uint8_t is_in_hdcp2_dp_states(struct mod_hdcp *hdcp)
 			current_state(hdcp) <= HDCP2_DP_STATE_END);
 }
 
+static inline uint8_t is_in_authenticated_states(struct mod_hdcp *hdcp)
+{
+	return (current_state(hdcp) == D1_A4_AUTHENTICATED ||
+	current_state(hdcp) == H1_A45_AUTHENTICATED ||
+	current_state(hdcp) == D2_A5_AUTHENTICATED ||
+	current_state(hdcp) == H2_A5_AUTHENTICATED);
+}
+
 static inline uint8_t is_hdcp1(struct mod_hdcp *hdcp)
 {
 	return (is_in_hdcp1_states(hdcp) || is_in_hdcp1_dp_states(hdcp));

drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h

@@ -294,7 +294,7 @@ enum mod_hdcp_status mod_hdcp_remove_display(struct mod_hdcp *hdcp,
 		uint8_t index, struct mod_hdcp_output *output);
 
 /* called per display to apply new authentication adjustment */
-enum mod_hdcp_status mod_hdcp_update_authentication(struct mod_hdcp *hdcp,
+enum mod_hdcp_status mod_hdcp_update_display(struct mod_hdcp *hdcp,
 		uint8_t index,
 		struct mod_hdcp_link_adjustment *link_adjust,
 		struct mod_hdcp_display_adjustment *display_adjust,