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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2025 Intel Corporation
*/
#include "kms_mst_helper.h"
/*
* @drm_fd: DRM file descriptor
* @display: pointer to #igt_display_t structure
* @output: target output
* @mst_outputs: filled with mst output of same toplogy as @output
* @num_mst_outputs: filled with count of mst outputs found in topology
*
* Iterates over all connected outputs and adds each DP MST
* output that shares the same MST connector ID as @output
* into @mst_outputs.
*
* Returns: 0 on success, -error on failure
*/
int igt_find_all_mst_output_in_topology(int drm_fd, igt_display_t *display,
igt_output_t *output,
igt_output_t *mst_outputs[],
int *num_mst_outputs)
{
int output_root_id, root_id;
igt_output_t *connector_output;
if (!igt_check_output_is_dp_mst(output))
return -EINVAL;
output_root_id = igt_get_dp_mst_connector_id(output);
if (output_root_id == -EINVAL)
return -EINVAL;
/*
* If output is MST check all other connected output which shares
* same path and fill mst_outputs and num_mst_outputs
*/
for_each_connected_output(display, connector_output) {
if (!igt_check_output_is_dp_mst(connector_output))
continue;
root_id = igt_get_dp_mst_connector_id(connector_output);
if (((*num_mst_outputs) < IGT_MAX_PIPES) && root_id == output_root_id)
mst_outputs[(*num_mst_outputs)++] = connector_output;
}
return 0;
}
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