drm/amd/display: add mod hdcp interface for supporting encryption state query

Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: George Shen <George.Shen@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -314,6 +314,9 @@ enum mod_hdcp_status mod_hdcp_add_display(struct mod_hdcp *hdcp,
 		goto out;
 	}
 
+	/* save current encryption states to restore after next authentication */
+	mod_hdcp_save_current_encryption_states(hdcp);
+
 	/* reset existing authentication status */
 	status = reset_authentication(hdcp, output);
 	if (status != MOD_HDCP_STATUS_SUCCESS)
@@ -360,6 +363,9 @@ enum mod_hdcp_status mod_hdcp_remove_display(struct mod_hdcp *hdcp,
 		goto out;
 	}
 
+	/* save current encryption states to restore after next authentication */
+	mod_hdcp_save_current_encryption_states(hdcp);
+
 	/* stop current authentication */
 	status = reset_authentication(hdcp, output);
 	if (status != MOD_HDCP_STATUS_SUCCESS)

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

@@ -331,6 +331,8 @@ enum mod_hdcp_status mod_hdcp_add_display_to_topology(
 		struct mod_hdcp *hdcp, struct mod_hdcp_display *display);
 enum mod_hdcp_status mod_hdcp_remove_display_from_topology(
 		struct mod_hdcp *hdcp, uint8_t index);
+bool mod_hdcp_is_link_encryption_enabled(struct mod_hdcp *hdcp);
+void mod_hdcp_save_current_encryption_states(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_create_session(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_destroy_session(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_validate_rx(struct mod_hdcp *hdcp);
@@ -339,8 +341,6 @@ enum mod_hdcp_status mod_hdcp_hdcp1_validate_ksvlist_vp(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_enable_dp_stream_encryption(
 	struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp1_link_maintenance(struct mod_hdcp *hdcp);
-enum mod_hdcp_status mod_hdcp_hdcp1_get_link_encryption_status(struct mod_hdcp *hdcp,
-							       enum mod_hdcp_encryption_status *encryption_status);
 enum mod_hdcp_status mod_hdcp_hdcp2_create_session(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp2_destroy_session(struct mod_hdcp *hdcp);
 enum mod_hdcp_status mod_hdcp_hdcp2_prepare_ake_init(struct mod_hdcp *hdcp);

drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c

@@ -256,10 +256,12 @@ static enum mod_hdcp_status authenticated(struct mod_hdcp *hdcp,
 		goto out;
 	}
 
-	if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_link_maintenance,
+	mod_hdcp_execute_and_set(mod_hdcp_hdcp1_link_maintenance,
 			&input->link_maintenance, &status,
-			hdcp, "link_maintenance"))
-		goto out;
+			hdcp, "link_maintenance");
+
+	if (status != MOD_HDCP_STATUS_SUCCESS)
+		mod_hdcp_save_current_encryption_states(hdcp);
 out:
 	return status;
 }
@@ -425,19 +427,24 @@ static enum mod_hdcp_status authenticated_dp(struct mod_hdcp *hdcp,
 		event_ctx->unexpected_event = 1;
 		goto out;
 	}
-
-	if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
-			&input->bstatus_read, &status,
-			hdcp, "bstatus_read"))
-		goto out;
-	if (!mod_hdcp_execute_and_set(check_link_integrity_dp,
-			&input->link_integrity_check, &status,
-			hdcp, "link_integrity_check"))
-		goto out;
-	if (!mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
-			&input->reauth_request_check, &status,
-			hdcp, "reauth_request_check"))
+	if (!mod_hdcp_is_link_encryption_enabled(hdcp))
 		goto out;
+
+	if (status == MOD_HDCP_STATUS_SUCCESS)
+		mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
+				&input->bstatus_read, &status,
+				hdcp, "bstatus_read");
+	if (status == MOD_HDCP_STATUS_SUCCESS)
+		mod_hdcp_execute_and_set(check_link_integrity_dp,
+				&input->link_integrity_check, &status,
+				hdcp, "link_integrity_check");
+	if (status == MOD_HDCP_STATUS_SUCCESS)
+		mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
+				&input->reauth_request_check, &status,
+				hdcp, "reauth_request_check");
+
+	if (status != MOD_HDCP_STATUS_SUCCESS)
+		mod_hdcp_save_current_encryption_states(hdcp);
 out:
 	return status;
 }

drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_transition.c

@@ -93,7 +93,7 @@ enum mod_hdcp_status mod_hdcp_hdcp1_transition(struct mod_hdcp *hdcp,
 		}
 		break;
 	case H1_A45_AUTHENTICATED:
-		if (input->link_maintenance != PASS) {
+		if (input->link_maintenance == FAIL) {
 			/* 1A-07: consider invalid ri' a failure */
 			/* 1A-07a: consider read ri' not returned a failure */
 			fail_and_restart_in_ms(0, &status, output);
@@ -243,8 +243,8 @@ enum mod_hdcp_status mod_hdcp_hdcp1_dp_transition(struct mod_hdcp *hdcp,
 		}
 		break;
 	case D1_A4_AUTHENTICATED:
-		if (input->link_integrity_check != PASS ||
-				input->reauth_request_check != PASS) {
+		if (input->link_integrity_check == FAIL ||
+				input->reauth_request_check == FAIL) {
 			/* 1A-07: restart hdcp on a link integrity failure */
 			fail_and_restart_in_ms(0, &status, output);
 			break;

drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c

@@ -564,11 +564,13 @@ static enum mod_hdcp_status authenticated(struct mod_hdcp *hdcp,
 		event_ctx->unexpected_event = 1;
 		goto out;
 	}
-
-	if (!process_rxstatus(hdcp, event_ctx, input, &status))
-		goto out;
-	if (event_ctx->rx_id_list_ready)
+	if (!mod_hdcp_is_link_encryption_enabled(hdcp))
 		goto out;
+
+	process_rxstatus(hdcp, event_ctx, input, &status);
+
+	if (status != MOD_HDCP_STATUS_SUCCESS)
+		mod_hdcp_save_current_encryption_states(hdcp);
 out:
 	return status;
 }

drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_transition.c

@@ -245,8 +245,8 @@ enum mod_hdcp_status mod_hdcp_hdcp2_transition(struct mod_hdcp *hdcp,
 		HDCP_FULL_DDC_TRACE(hdcp);
 		break;
 	case H2_A5_AUTHENTICATED:
-		if (input->rxstatus_read != PASS ||
-				input->reauth_request_check != PASS) {
+		if (input->rxstatus_read == FAIL ||
+				input->reauth_request_check == FAIL) {
 			fail_and_restart_in_ms(0, &status, output);
 			break;
 		} else if (event_ctx->rx_id_list_ready && conn->is_repeater) {
@@ -562,11 +562,11 @@ enum mod_hdcp_status mod_hdcp_hdcp2_dp_transition(struct mod_hdcp *hdcp,
 		HDCP_FULL_DDC_TRACE(hdcp);
 		break;
 	case D2_A5_AUTHENTICATED:
-		if (input->rxstatus_read != PASS ||
-				input->reauth_request_check != PASS) {
+		if (input->rxstatus_read == FAIL ||
+				input->reauth_request_check == FAIL) {
 			fail_and_restart_in_ms(0, &status, output);
 			break;
-		} else if (input->link_integrity_check_dp != PASS) {
+		} else if (input->link_integrity_check_dp == FAIL) {
 			if (hdcp->connection.hdcp2_retry_count >= 1)
 				adjust->hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0;
 			fail_and_restart_in_ms(0, &status, output);

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

@@ -914,3 +914,13 @@ enum mod_hdcp_status mod_hdcp_hdcp2_validate_stream_ready(struct mod_hdcp *hdcp)
 	return status;
 }
 
+bool mod_hdcp_is_link_encryption_enabled(struct mod_hdcp *hdcp)
+{
+	/* unsupported */
+	return true;
+}
+
+void mod_hdcp_save_current_encryption_states(struct mod_hdcp *hdcp)
+{
+	/* unsupported */
+}