6.1-stable review patch. If anyone has any objections, please let me know.
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From: RD Babiera rdbabiera@google.com
commit 89434b069e460967624903b049e5cf5c9e6b99b9 upstream.
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@vger.kernel.org Signed-off-by: RD Babiera rdbabiera@google.com Acked-by: Heikki Krogerus heikki.krogerus@linux.intel.com Link: https://lore.kernel.org/r/20231009210057.3773877-2-rdbabiera@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/typec/altmodes/displayport.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/usb/typec/altmodes/displayport.c +++ b/drivers/usb/typec/altmodes/displayport.c @@ -301,6 +301,11 @@ static int dp_altmode_vdm(struct typec_a case CMD_EXIT_MODE: 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;