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-rw-r--r--backend/drm/drm.c55
-rw-r--r--backend/drm/properties.c1
-rw-r--r--include/backend/drm/properties.h1
3 files changed, 34 insertions, 23 deletions
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index f14e3bb0..14f1254f 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -991,36 +991,44 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, bool *changed_outputs) {
}
}
-static uint32_t get_possible_crtcs(int fd, uint32_t conn_id) {
- drmModeConnector *conn = drmModeGetConnector(fd, conn_id);
- if (!conn) {
- wlr_log_errno(WLR_ERROR, "Failed to get DRM connector");
- return 0;
- }
+static uint32_t get_possible_crtcs(int fd, drmModeRes *res,
+ drmModeConnector *conn, bool is_mst) {
+ drmModeEncoder *enc;
+ uint32_t ret = 0;
- if (conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0) {
- wlr_log(WLR_ERROR, "Output is not connected");
- goto error_conn;
- }
-
- drmModeEncoder *enc = NULL;
for (int i = 0; !enc && i < conn->count_encoders; ++i) {
enc = drmModeGetEncoder(fd, conn->encoders[i]);
+ if (!enc) {
+ continue;
+ }
+
+ ret |= enc->possible_crtcs;
+
+ drmModeFreeEncoder(enc);
+ }
+
+ // Sometimes DP MST connectors report no encoders, so we'll loop though
+ // all of the encoders of the MST type instead.
+ // TODO: See if there is a better solution.
+
+ if (!is_mst || ret) {
+ return ret;
}
- if (!enc) {
- wlr_log(WLR_ERROR, "Failed to get DRM encoder");
- goto error_conn;
+ for (int i = 0; i < res->count_encoders; ++i) {
+ enc = drmModeGetEncoder(fd, res->encoders[i]);
+ if (!enc) {
+ continue;
+ }
+
+ if (enc->encoder_type == DRM_MODE_ENCODER_DPMST) {
+ ret |= enc->possible_crtcs;
+ }
+
+ drmModeFreeEncoder(enc);
}
- uint32_t ret = enc->possible_crtcs;
- drmModeFreeEncoder(enc);
- drmModeFreeConnector(conn);
return ret;
-
-error_conn:
- drmModeFreeConnector(conn);
- return 0;
}
void scan_drm_connectors(struct wlr_drm_backend *drm) {
@@ -1167,7 +1175,8 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
wl_list_insert(&wlr_conn->output.modes, &mode->wlr_mode.link);
}
- wlr_conn->possible_crtc = get_possible_crtcs(drm->fd, wlr_conn->id);
+ wlr_conn->possible_crtc = get_possible_crtcs(drm->fd, res, drm_conn,
+ wlr_conn->props.path != 0);
if (wlr_conn->possible_crtc == 0) {
wlr_log(WLR_ERROR, "No CRTC possible for connector '%s'",
wlr_conn->output.name);
diff --git a/backend/drm/properties.c b/backend/drm/properties.c
index 5ca4c8ac..5541d1be 100644
--- a/backend/drm/properties.c
+++ b/backend/drm/properties.c
@@ -22,6 +22,7 @@ static const struct prop_info connector_info[] = {
{ "CRTC_ID", INDEX(crtc_id) },
{ "DPMS", INDEX(dpms) },
{ "EDID", INDEX(edid) },
+ { "PATH", INDEX(path) },
{ "link-status", INDEX(link_status) },
#undef INDEX
};
diff --git a/include/backend/drm/properties.h b/include/backend/drm/properties.h
index 321b4492..b4d43bdd 100644
--- a/include/backend/drm/properties.h
+++ b/include/backend/drm/properties.h
@@ -15,6 +15,7 @@ union wlr_drm_connector_props {
uint32_t edid;
uint32_t dpms;
uint32_t link_status; // not guaranteed to exist
+ uint32_t path;
// atomic-modesetting only