backend/drm: add support for the subconnector property
The subconnector property indicates the connector sub-type. This is useful because that usually indicates what kind of connector the user has plugged in to their monitor, e.g. a DisplayPort-to-DVI cable will indicate a DVI subconnector. Also some laptops have non-DP connectors that are internally linked to a DP port on the GPU. Set the output description accordingly. See https://drmdb.emersion.fr/properties/3233857728/subconnector
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@ -1349,12 +1349,25 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
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parse_edid(&wlr_conn->output, edid_len, edid);
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free(edid);
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char *subconnector = NULL;
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if (wlr_conn->props.subconnector) {
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subconnector = get_drm_prop_enum(drm->fd,
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wlr_conn->id, wlr_conn->props.subconnector);
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}
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if (subconnector && strcmp(subconnector, "Native") == 0) {
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free(subconnector);
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subconnector = NULL;
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}
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struct wlr_output *output = &wlr_conn->output;
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char description[128];
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snprintf(description, sizeof(description), "%s %s %s (%s)",
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output->make, output->model, output->serial, output->name);
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snprintf(description, sizeof(description), "%s %s %s (%s%s%s)",
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output->make, output->model, output->serial, output->name,
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subconnector ? " via " : "", subconnector ? subconnector : "");
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wlr_output_set_description(output, description);
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free(subconnector);
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wlr_log(WLR_INFO, "Detected modes:");
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for (int i = 0; i < drm_conn->count_modes; ++i) {
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@ -1,3 +1,4 @@
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#define _POSIX_C_SOURCE 200809L
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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@ -24,6 +25,7 @@ static const struct prop_info connector_info[] = {
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{ "EDID", INDEX(edid) },
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{ "PATH", INDEX(path) },
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{ "link-status", INDEX(link_status) },
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{ "subconnector", INDEX(subconnector) },
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{ "vrr_capable", INDEX(vrr_capable) },
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#undef INDEX
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};
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@ -151,3 +153,27 @@ void *get_drm_prop_blob(int fd, uint32_t obj, uint32_t prop, size_t *ret_len) {
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drmModeFreePropertyBlob(blob);
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return ptr;
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}
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char *get_drm_prop_enum(int fd, uint32_t obj, uint32_t prop_id) {
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uint64_t value;
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if (!get_drm_prop(fd, obj, prop_id, &value)) {
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return NULL;
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}
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drmModePropertyRes *prop = drmModeGetProperty(fd, prop_id);
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if (!prop) {
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return NULL;
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}
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char *str = NULL;
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for (int i = 0; i < prop->count_enums; i++) {
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if (prop->enums[i].value == value) {
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str = strdup(prop->enums[i].name);
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break;
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}
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}
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drmModeFreeProperty(prop);
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return str;
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}
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@ -17,6 +17,7 @@ union wlr_drm_connector_props {
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uint32_t link_status; // not guaranteed to exist
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uint32_t path;
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uint32_t vrr_capable; // not guaranteed to exist
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uint32_t subconnector; // not guaranteed to exist
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// atomic-modesetting only
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@ -69,5 +70,6 @@ bool get_drm_plane_props(int fd, uint32_t id, union wlr_drm_plane_props *out);
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bool get_drm_prop(int fd, uint32_t obj, uint32_t prop, uint64_t *ret);
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void *get_drm_prop_blob(int fd, uint32_t obj, uint32_t prop, size_t *ret_len);
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char *get_drm_prop_enum(int fd, uint32_t obj, uint32_t prop);
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#endif
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