backend/drm: Improve encoder logic

This fixes an issue that can occur with DP MST connectors not reporting
any encoders.
This commit is contained in:
Scott Anderson 2018-12-09 22:48:00 +13:00
parent f8056a0350
commit efdd4d6ea2
3 changed files with 34 additions and 23 deletions

View file

@ -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);
}
if (!enc) {
wlr_log(WLR_ERROR, "Failed to get DRM encoder");
goto error_conn;
// 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;
}
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);

View file

@ -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
};

View file

@ -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