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| author |  RD Babiera <rdbabiera@google.com>
| 2023-10-09 21:00:58 +0000 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2023-10-11 11:38:06 +0200 |
| commit | 89434b069e460967624903b049e5cf5c9e6b99b9 (patch) | |
| tree | a9f540b82fcc5216ef58055544d9515fcd9d0af3 /drivers/usb | |
| parent | xhci: Preserve RsvdP bits in ERSTBA register correctly (diff) | |
| download | linux-89434b069e460967624903b049e5cf5c9e6b99b9.tar.gz linux-89434b069e460967624903b049e5cf5c9e6b99b9.tar.bz2 linux-89434b069e460967624903b049e5cf5c9e6b99b9.zip | |
usb: typec: altmodes/displayport: Signal hpd low when exiting mode
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>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/typec/altmodes/displayport.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c index 426c88a516e5..59e0218a8bc5 100644 --- a/drivers/usb/typec/altmodes/displayport.c +++ b/drivers/usb/typec/altmodes/displayport.c @@ -304,6 +304,11 @@ 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; |