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

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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>

Bug: 297208252
Bug: 308184880
(cherry picked from commit 89434b069e)
[rd: removed unused call to drm_connector_oob_hotplug_event]
Change-Id: Iad61fa4db6b126db7fc3bd717b60c2ca35da1311
Signed-off-by: RD Babiera <rdbabiera@google.com>
This commit is contained in:
RD Babiera
2023-10-13 21:31:01 +00:00
parent b39c40b693
commit 501954e892
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/typec/altmodes/displayport.c
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@@ -297,6 +297,10 @@ static int dp_altmode_vdm(struct typec_altmode *alt,
case CMD_EXIT_MODE:
dp->data.status = 0;
dp->data.conf = 0;
if (dp->hpd) {
dp->hpd = false;
sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
}
break;
case DP_CMD_STATUS_UPDATE:
dp->data.status = *vdo;