On Mon, Oct 09, 2023 at 09:00:58PM +0000, RD Babiera wrote: > Upon receiving an ACK for a sent EXIT_MODE message, the DisplayPort > driver currently resets the status and configuration of the port partner. > The hpd signal is not updated despite being part of the status, so the > Display stack can still transmit video despite typec_altmode_exit placing > the lanes in a Safe State. > > Set hpd to low when a sent EXIT_MODE message is ACK'ed. > > Fixes: 0e3bb7d6894d ("usb: typec: Add driver for DisplayPort alternate mode") > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: RD Babiera <rdbabiera@xxxxxxxxxx> Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> > --- > drivers/usb/typec/altmodes/displayport.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c > index f503cb4cd721..718da02036d8 100644 > --- a/drivers/usb/typec/altmodes/displayport.c > +++ b/drivers/usb/typec/altmodes/displayport.c > @@ -307,6 +307,11 @@ static int dp_altmode_vdm(struct typec_altmode *alt, > typec_altmode_update_active(alt, false); > dp->data.status = 0; > dp->data.conf = 0; > + if (dp->hpd) { > + drm_connector_oob_hotplug_event(dp->connector_fwnode); > + dp->hpd = false; > + sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd"); > + } > break; > case DP_CMD_STATUS_UPDATE: > dp->data.status = *vdo; > > base-commit: 1053c4a4b8fcbd28386e80347e7c82d4d617e352 > -- > 2.42.0.609.gbb76f46606-goog -- heikki