diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/drm_probe_helper.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index 33bf550a1d3f..6591d48c1b9d 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -335,6 +335,24 @@ static void output_poll_execute(struct work_struct *work) if (old_status != connector->status) { const char *old, *new; + /* + * The poll work sets force=false when calling detect so + * that drivers can avoid to do disruptive tests (e.g. + * when load detect cycles could cause flickering on + * other, running displays). This bears the risk that we + * flip-flop between unknown here in the poll work and + * the real state when userspace forces a full detect + * call after receiving a hotplug event due to this + * change. + * + * Hence clamp an unknown detect status to the old + * value. + */ + if (connector->status == connector_status_unknown) { + connector->status = old_status; + continue; + } + old = drm_get_connector_status_name(old_status); new = drm_get_connector_status_name(connector->status); |