usb: typec: displayport: Receive DP Status Update NAK request exit dp altmode

JIRA: https://issues.redhat.com/browse/RHEL-116016

commit b4b38ff
Author: Jos Wang <joswang@lenovo.com>
Date: Sun, 9 Feb 2025 15:19:26 +0800

  Although some Type-C DRD devices that do not support the DP Sink
  function (such as Huawei Mate 40Pro), the Source Port initiates
  Enter Mode CMD, but the device responds to Enter Mode ACK, the
  Source port then initiates DP Status Update CMD, and the device
  responds to DP Status Update NAK.

  As PD2.0 spec ("6.4.4.3.4 Enter Mode Command")，A DR_Swap Message
  Shall Not be sent during Modal Operation between the Port Partners.
  At this time, the source port initiates DR_Swap message through the
  "echo device > /sys/class/typec/port0/data_role" command to switch
  the data role from host to device. The device will initiate a Hard
  Reset for recovery, resulting in the failure of data role swap.

  Therefore, when DP Status Update NAK is received, Exit Mode CMD is
  initiated to exit the currently entered DP altmode.

  Signed-off-by: Jos Wang <joswang@lenovo.com>
  Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
  Link: https://lore.kernel.org/r/20250209071926.69625-1-joswang1221@gmail.com
  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

Author: Desnes Nunes

drivers/usb/typec/altmodes/displayport.c

@@ -393,6 +393,10 @@ static int dp_altmode_vdm(struct typec_altmode *alt,
 		break;
 	case CMDT_RSP_NAK:
 		switch (cmd) {
+		case DP_CMD_STATUS_UPDATE:
+			if (typec_altmode_exit(alt))
+				dev_err(&dp->alt->dev, "Exit Mode Failed!\n");
+			break;
 		case DP_CMD_CONFIGURE:
 			dp->data.conf = 0;
 			ret = dp_altmode_configured(dp);