This is a note to let you know that I've just added the patch titled
usb: typec: altmodes/displayport: Signal hpd low when exiting mode
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-typec-altmodes-displayport-signal-hpd-low-when-exiting-mode.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 89434b069e460967624903b049e5cf5c9e6b99b9 Mon Sep 17 00:00:00 2001
From: RD Babiera <rdbabiera@xxxxxxxxxx>
Date: Mon, 9 Oct 2023 21:00:58 +0000
Subject: usb: typec: altmodes/displayport: Signal hpd low when exiting mode
From: RD Babiera <rdbabiera@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: RD Babiera <rdbabiera@xxxxxxxxxx>
Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231009210057.3773877-2-rdbabiera@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from rdbabiera@xxxxxxxxxx are
queue-6.1/usb-typec-altmodes-displayport-signal-hpd-low-when-exiting-mode.patch
