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backend/drm: add support for the subconnector property

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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
This commit is contained in:
Simon Ser 2021-01-13 00:33:19 +01:00
parent 6af748171a
commit cb6f584496
3 changed files with 43 additions and 2 deletions
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17
backend/drm/drm.c
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@ -1349,12 +1349,25 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
parse_edid(&wlr_conn->output, edid_len, edid);
free(edid);
char *subconnector = NULL;
if (wlr_conn->props.subconnector) {
subconnector = get_drm_prop_enum(drm->fd,
wlr_conn->id, wlr_conn->props.subconnector);
}
if (subconnector && strcmp(subconnector, "Native") == 0) {
free(subconnector);
subconnector = NULL;
}
struct wlr_output *output = &wlr_conn->output;
char description[128];
snprintf(description, sizeof(description), "%s %s %s (%s)",
output->make, output->model, output->serial, output->name);
snprintf(description, sizeof(description), "%s %s %s (%s%s%s)",
output->make, output->model, output->serial, output->name,
subconnector ? " via " : "", subconnector ? subconnector : "");
wlr_output_set_description(output, description);
free(subconnector);
wlr_log(WLR_INFO, "Detected modes:");
for (int i = 0; i < drm_conn->count_modes; ++i) {