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usb: typec: altmodes/displayport: Signal hpd low when exiting mode

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commit 89434b069e 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: 0e3bb7d689 ("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>
This commit is contained in:
RD Babiera
2023-10-09 21:00:58 +00:00
committed by Greg Kroah-Hartman
parent bc67250859
commit 4d85f1ce6c
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/typec/altmodes/displayport.c
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@@ -301,6 +301,11 @@ static int dp_altmode_vdm(struct typec_altmode *alt,
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;